阅读说明：本技术 一种蜂窝陶瓷载体表面增强涂料及其制备方法和应用 (Honeycomb ceramic carrier surface reinforcing coating and preparation method and application thereof ) 是由 李桂娟 张瑶 许妹华 鹿明 于 2020-11-27 设计创作，主要内容包括：本发明属于涂料领域,尤其涉及一种蜂窝陶瓷载体表面增强涂料及其制备方法和应用。本发明提供的涂料以重量份数计,包括：一级纤维20～50份；二级纤维1～3份；硅酸铝镁2～5份；无机溶胶140～260份；无机粉料200～600份；所述一级纤维的纤维直径为2～4μm,纤维长度为50～250μm；所述二级纤维的纤维直径为3～10μm,纤维长度为50～250μm。本发明通过对涂料的成分组成进行优化设计,特别是两级纤维的复配,达到纤维长短粗细合理搭接的效果,从而显著提高了涂料的抗热冲击性能。将本发明的蜂窝陶瓷载体表面增强涂料涂覆于蜂窝陶瓷载体表面,其抗热冲击性能可达到850℃循环三次无裂纹。(The invention belongs to the field of coatings, and particularly relates to a honeycomb ceramic carrier surface reinforcing coating as well as a preparation method and application thereof. The coating provided by the invention comprises the following components in parts by weight: 20-50 parts of primary fiber; 1-3 parts of secondary fiber; 2-5 parts of aluminum magnesium silicate; 140-260 parts of inorganic sol; 200-600 parts of inorganic powder; the fiber diameter of the primary fiber is 2-4 μm, and the fiber length is 50-250 μm; the diameter of the secondary fiber is 3-10 μm, and the length of the secondary fiber is 50-250 μm. The invention achieves the effect of reasonably overlapping the length, the thickness and the thickness of the fibers by optimally designing the component composition of the coating, particularly compounding the two-stage fibers, thereby obviously improving the thermal shock resistance of the coating. The surface enhanced coating of the honeycomb ceramic carrier is coated on the surface of the honeycomb ceramic carrier, and the thermal shock resistance of the surface enhanced coating can reach 850 ℃ and can be circulated for three times without cracks.)

1. A honeycomb ceramic carrier surface reinforcing coating comprises the following components in parts by weight:

the fiber diameter of the primary fiber is 2-4 μm, and the fiber length is 50-250 μm;

the diameter of the secondary fiber is 3-10 μm, and the length of the secondary fiber is 50-250 μm.

2. The coating of claim 1, wherein the primary fibers are one or more of high purity fibers, high alumina fibers, and zirconium-containing fibers;

al of the high-purity fiber₂O₃The content is more than or equal to 45 wt%, SiO₂Not less than 54 wt% of Fe₂O₃The content of (A) is less than or equal to 0.2 wt%; al of the high-aluminum fiber₂O₃The content is more than or equal to 53wt percent, and SiO is₂Content is more than or equal to 46 wt%, Fe₂O₃The content of (A) is less than or equal to 0.2 wt%; al of the alumina fiber₂O₃The content is more than or equal to 72 wt%, and Al₂O₃And SiO₂The total content of (B) is not less than 99.5 wt%, Fe₂O₃The content of (A) is less than or equal to 0.1 wt%; al of the zirconium-containing fiber₂O₃The content is more than or equal to 36 wt%, SiO₂Content is not less than 48 wt%, ZrO₂Content not less than 15 wt%, Fe₂O₃The content of (B) is less than or equal to 0.1 wt%.

3. The coating of claim 1, wherein the secondary fibers are alkali-free glass fibers and/or medium alkali glass fibers.

4. The coating according to claim 1, wherein the inorganic sol is a silica sol and/or a zirconia sol.

5. The coating according to claim 1, wherein the inorganic powder is cordierite powder and/or fused quartz powder.

6. The coating according to claim 1, wherein the inorganic powder has a particle size of 200 to 1000 mesh.

7. A method for preparing the honeycomb ceramic carrier surface reinforcing coating of any one of claims 1 to 6, comprising the following steps:

a) and mixing the primary fiber, the secondary fiber, the aluminum magnesium silicate, the inorganic sol and the inorganic powder to obtain the honeycomb ceramic carrier surface reinforcing coating.

8. The method according to claim 7, wherein the step a) comprises:

a1) mixing and ball-milling a primary fiber raw material, a secondary fiber raw material, aluminum magnesium silicate and part of inorganic sol to obtain a coating base material;

the primary fiber raw material is primary fiber which is not subjected to ball milling and crushing, the fiber diameter of the primary fiber raw material is 2-4 mu m, and the fiber length is 100-200 mm;

the secondary fiber raw material is secondary fiber which is not subjected to ball milling and crushing, the fiber diameter of the secondary fiber raw material is 3-10 mu m, and the fiber length is 3-10 mm;

a2) and mixing the coating base material, the inorganic powder and the balance of inorganic sol to obtain the honeycomb ceramic carrier surface enhanced coating.

9. The preparation method according to claim 8, wherein the step a1) specifically comprises:

firstly, mixing and ball-milling a primary fiber raw material, a secondary fiber raw material and part of inorganic sol, and then continuously mixing and ball-milling a mixed ball-milling product and aluminum magnesium silicate to obtain a coating base material.

10. A honeycomb ceramic carrier, which comprises a honeycomb ceramic carrier substrate, wherein the surface of the honeycomb ceramic carrier substrate is coated with the honeycomb ceramic carrier surface reinforcing coating of any one of claims 1 to 6.

Technical Field

The invention belongs to the field of coatings, and particularly relates to a honeycomb ceramic carrier surface reinforcing coating as well as a preparation method and application thereof.

Background

With the rapid development of economy and the rapid increase of automobile occupancy, automobile exhaust treatment is more and more concerned by people. With the continuous enhancement of the requirement of China on environmental protection, the emission standard of automobile exhaust is gradually improved, and particularly the emission standard of 'national six', which is about to be implemented in China, puts forward higher requirements on the emission of the automobile exhaust, so that the market puts forward stricter requirements on a honeycomb ceramic carrier for treating the automobile exhaust.

In order to improve the catalytic efficiency of the honeycomb ceramic carrier, the pore density of the honeycomb ceramic carrier is increased and the pore wall is thinner and thinner, which causes difficulty in one-step molding of the large-diameter honeycomb ceramic carrier, the molded green body is sintered firstly, then the outer skin of the sintered green body is removed, finally a layer of surface-enhanced coating is coated on the periphery of the green body, and the finished honeycomb ceramic carrier is obtained after drying. After the outer skin of the green body is removed, the outer wall network is thin and brittle, the mechanical strength is poor, and the honeycomb ceramic carrier is used on a bumpy automobile for a long time and is continuously subjected to mechanical impact, so that the surface enhanced coating of the honeycomb ceramic carrier is required to have higher mechanical strength so as to play a role in protecting the honeycomb ceramic carrier from being damaged mechanically. In addition, in the tail gas treatment process, the catalyst needs to generate a catalytic action through ignition, and the catalyst carrier is continuously subjected to thermal shock in the use process, so that the honeycomb ceramic carrier is required to have good thermal shock resistance.

The honeycomb ceramic carrier on the market can meet the requirement of no crack of three times of quenching at 650 ℃, but with the gradual implementation of the discharge standard of 'national six', the hole wall of the honeycomb ceramic carrier becomes thinner and thinner, and higher requirements on the thermal shock resistance of the honeycomb ceramic carrier are provided.

Disclosure of Invention

In view of the above, the invention aims to provide a honeycomb ceramic carrier surface-enhanced coating, and a preparation method and an application thereof.

The invention provides a honeycomb ceramic carrier surface reinforcing coating which comprises the following components in parts by weight:

the fiber diameter of the primary fiber is 2-4 μm, and the fiber length is 50-250 μm;

the diameter of the secondary fiber is 3-10 μm, and the length of the secondary fiber is 50-250 μm.

Preferably, the primary fiber is one or more of a high-purity fiber, a high-alumina fiber, an alumina fiber and a zirconium-containing fiber;

al of the high-purity fiber₂O₃The content is more than or equal to 45 wt%, SiO₂Not less than 54 wt% of Fe₂O₃The content of (A) is less than or equal to 0.2 wt%; al of the high-aluminum fiber₂O₃The content is more than or equal to 53wt percent, and SiO is₂Content is more than or equal to 46 wt%, Fe₂O₃The content of (A) is less than or equal to 0.2 wt%; al of the alumina fiber₂O₃The content is more than or equal to 72 wt%, and Al₂O₃And SiO₂The total content of (B) is not less than 99.5 wt%, Fe₂O₃The content of (A) is less than or equal to 0.1 wt%; al of the zirconium-containing fiber₂O₃The content is more than or equal to 36 wt%, SiO₂Content is not less than 48 wt%, ZrO₂Content not less than 15 wt%, Fe₂O₃The content of (B) is less than or equal to 0.1 wt%.

Preferably, the secondary fiber is an alkali-free glass fiber and/or a medium-alkali glass fiber.

Preferably, the inorganic sol is a silica sol and/or a zirconia sol.

Preferably, the inorganic powder is cordierite powder and/or fused quartz powder.

Preferably, the particle size of the inorganic powder is 200-1000 meshes.

The invention provides a preparation method of a honeycomb ceramic carrier surface enhanced coating in the technical scheme, which comprises the following steps:

a) and mixing the primary fiber, the secondary fiber, the aluminum magnesium silicate, the inorganic sol and the inorganic powder to obtain the honeycomb ceramic carrier surface reinforcing coating.

Preferably, the step a) specifically comprises:

a1) mixing and ball-milling a primary fiber raw material, a secondary fiber raw material, aluminum magnesium silicate and part of inorganic sol to obtain a coating base material;

the primary fiber raw material is primary fiber which is not subjected to ball milling and crushing, the fiber diameter of the primary fiber raw material is 2-4 mu m, and the fiber length is 100-200 mm;

the secondary fiber raw material is secondary fiber which is not subjected to ball milling and crushing, the fiber diameter of the secondary fiber raw material is 3-10 mu m, and the fiber length is 3-10 mm;

a2) and mixing the coating base material, the inorganic powder and the balance of inorganic sol to obtain the honeycomb ceramic carrier surface enhanced coating.

Preferably, the step a1) specifically includes:

firstly, mixing and ball-milling a primary fiber raw material, a secondary fiber raw material and part of inorganic sol, and then continuously mixing and ball-milling a mixed ball-milling product and aluminum magnesium silicate to obtain a coating base material.

The invention provides a honeycomb ceramic carrier, which comprises a honeycomb ceramic carrier substrate, wherein the surface of the honeycomb ceramic carrier substrate is coated with the surface-enhanced coating of the honeycomb ceramic carrier in the technical scheme.

Compared with the prior art, the invention provides a honeycomb ceramic carrier surface reinforcing coating and a preparation method and application thereof. The coating provided by the invention comprises the following components in parts by weight: 20-50 parts of primary fiber; 1-3 parts of secondary fiber; 2-5 parts of aluminum magnesium silicate; 140-260 parts of inorganic sol; 200-600 parts of inorganic powder; the fiber diameter of the primary fiber is 2-4 μm, and the fiber length is 50-250 μm; the diameter of the secondary fiber is 3-10 μm, and the length of the secondary fiber is 50-250 μm. The invention achieves the effect of reasonably overlapping the length, the thickness and the thickness of the fibers by optimally designing the component composition of the coating, particularly compounding the two-stage fibers, thereby obviously improving the thermal shock resistance of the coating. The surface enhanced coating of the honeycomb ceramic carrier is coated on the surface of the honeycomb ceramic carrier, the thermal shock resistance of the surface enhanced coating can reach 850 ℃ for three times of circulation without cracks, and further powerful support is provided for the discharge standard of 'national six'.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a honeycomb ceramic carrier surface reinforcing coating which comprises the following components in parts by weight:

the fiber diameter of the primary fiber is 2-4 μm, and the fiber length is 50-250 μm;

the diameter of the secondary fiber is 3-10 μm, and the length of the secondary fiber is 50-250 μm.

The coating provided by the invention comprises primary fibers, secondary fibers, magnesium aluminum silicate, inorganic sol and inorganic powder. The diameter of the primary fiber is preferably 2-4 μm, and specifically can be 2 μm, 2.5 μm, 3 μm, 3.5 μm or 4 μm; the length of the primary fiber is preferably 50-250 μm, and specifically can be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm or 250 μm; the primary fiber is preferably a ball-milling crushing product of a primary fiber raw material, and the fiber length of the primary fiber raw material before ball-milling crushing is preferably 100-200 mm, and specifically can be 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm or 200 mm. In the present invention, the primary fibers are preferably one or more of high purity fibers, high alumina fibers, and zirconium-containing fibers; al of the high-purity fiber₂O₃The content is more than or equal to 45 wt%, SiO₂Not less than 54 wt% of Fe₂O₃The content of (A) is less than or equal to 0.2 wt%; al of the high-aluminum fiber₂O₃The content is more than or equal to 53wt percent, and SiO is₂Content is more than or equal to 46 wt%, Fe₂O₃The content of (A) is less than or equal to 0.2 wt%; al of the alumina fiber₂O₃The content is more than or equal to 72 wt%, and Al₂O₃And SiO₂The total content of (B) is not less than 99.5 wt%, Fe₂O₃The content of (A) is less than or equal to 0.1 wt%; al of the zirconium-containing fiber₂O₃The content is more than or equal to 36 wt%, SiO₂Content is not less than 48 wt%, ZrO₂Content not less than 15 wt%, Fe₂O₃The content of (B) is less than or equal to 0.1 wt%. In the present invention, the content of the primary fiber in the coating material is 20 to 50 parts by weight, specifically 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, or 50 parts by weight.

In the coating provided by the invention, the fiber diameter of the secondary fiber is preferably 3-10 μm, and specifically can be 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm; the length of the secondary fiber is preferably 50-250 μm, and specifically can be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm or 250 μm; the secondary fiber is preferably a ball-milling crushing product of a primary fiber raw material, and the fiber length of the secondary fiber raw material before ball-milling crushing is preferably 3-10 mm, specifically 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10 mm. In the present invention, the secondary fiber is preferably an alkali-free glass fiber and/or a medium-alkali glass fiber. In the present invention, the content of the secondary fiber in the coating material is 1 to 3 parts by weight, specifically 1 part by weight, 1.1 part by weight, 1.2 parts by weight, 1.3 parts by weight, 1.4 parts by weight, 1.5 parts by weight, 1.6 parts by weight, 1.7 parts by weight, 1.8 parts by weight, 1.9 parts by weight, 2 parts by weight, 2.1 parts by weight, 2.2 parts by weight, 2.3 parts by weight, 2.4 parts by weight, 2.5 parts by weight, 2.6 parts by weight, 2.7 parts by weight, 2.8 parts by weight, 2.9 parts by weight, or 3 parts by weight.

In the coating provided by the present invention, the content of the aluminum magnesium silicate in the coating is 2 to 5 parts by weight, specifically 2 parts by weight, 2.1 parts by weight, 2.2 parts by weight, 2.3 parts by weight, 2.4 parts by weight, 2.5 parts by weight, 2.6 parts by weight, 2.7 parts by weight, 2.8 parts by weight, 2.9 parts by weight, 3 parts by weight, 3.1 parts by weight, 3.2 parts by weight, 3.3 parts by weight, 3.4 parts by weight, 3.5 parts by weight, 3.6 parts by weight, 3.7 parts by weight, 3.8 parts by weight, 3.9 parts by weight, 4 parts by weight, 4.1 parts by weight, 4.2 parts by weight, 4.3 parts by weight, 4.4 parts by weight, 4.5 parts by weight, 4.6 parts by weight, 4.7 parts by weight, 4.8 parts by weight, 4.9 parts by weight, or 5 parts by weight.

In the coating provided by the invention, the inorganic sol is preferably silica sol and/or zirconia sol; the solid content of the inorganic sol is preferably 30 to 40 wt%, and specifically may be 30 wt%, 31 wt%, 32 wt%, 33 wt%, 34 wt%, 35 wt%, 36 wt%, 37 wt%, 38 wt%, 39 wt%, or 40 wt%. In the present invention, the content of the inorganic sol in the coating material is 140 to 260 parts by weight, and specifically may be 140 parts by weight, 145 parts by weight, 150 parts by weight, 155 parts by weight, 160 parts by weight, 165 parts by weight, 170 parts by weight, 175 parts by weight, 180 parts by weight, 185 parts by weight, 190 parts by weight, 191 parts by weight, 195 parts by weight, 196 parts by weight, 200 parts by weight, 205 parts by weight, 210 parts by weight, 215 parts by weight, 220 parts by weight, 225 parts by weight, 230 parts by weight, 235 parts by weight, 240 parts by weight, 245 parts by weight, 250 parts by weight, 253 parts by weight, 255 parts by weight, or 260 parts by weight.

In the coating provided by the invention, the inorganic powder is preferably cordierite powder and/or fused quartz powder; the particle size of the inorganic powder is preferably 200-1000 meshes, and specifically can be 200 meshes, 250 meshes, 300 meshes, 325 meshes, 350 meshes, 400 meshes, 450 meshes, 500 meshes, 550 meshes, 600 meshes, 650 meshes, 700 meshes, 750 meshes, 800 meshes, 850 meshes, 900 meshes, 950 meshes or 1000 meshes. In the present invention, the content of the inorganic powder in the coating material is 200 to 600 parts by weight, and specifically may be 200 parts by weight, 210 parts by weight, 220 parts by weight, 227 parts by weight, 230 parts by weight, 240 parts by weight, 247 parts by weight, 250 parts by weight, 260 parts by weight, 270 parts by weight, 280 parts by weight, 290 parts by weight, 300 parts by weight, 309 parts by weight, 310 parts by weight, 320 parts by weight, 350 parts by weight, 370 parts by weight, 400 parts by weight, 420 parts by weight, 450 parts by weight, 470 parts by weight, 500 parts by weight, 520 parts by weight, 550 parts by weight, 570 parts by weight, or 600 parts by weight.

The invention also provides a preparation method of the honeycomb ceramic carrier surface enhanced coating in the technical scheme, which comprises the following steps:

a) and mixing the primary fiber, the secondary fiber, the aluminum magnesium silicate, the inorganic sol and the inorganic powder to obtain the honeycomb ceramic carrier surface reinforcing coating.

In the preparation method provided by the invention, the primary fiber, the secondary fiber, the aluminum magnesium silicate, the inorganic sol and the inorganic powder are directly and uniformly mixed according to the proportion to obtain the coating provided by the invention, and the specific preparation process preferably comprises the following steps:

a1) mixing and ball-milling a primary fiber raw material, a secondary fiber raw material, aluminum magnesium silicate and part of inorganic sol to obtain a coating base material;

the primary fiber raw material is primary fiber which is not subjected to ball milling and crushing, the fiber diameter of the primary fiber raw material is 2-4 mu m, and the fiber length is 100-200 mm;

the secondary fiber raw material is secondary fiber which is not subjected to ball milling and crushing, the fiber diameter of the secondary fiber raw material is 3-10 mu m, and the fiber length is 3-10 mm;

a2) and mixing the coating base material, the inorganic powder and the balance of inorganic sol to obtain the honeycomb ceramic carrier surface enhanced coating.

In the preparation process provided by the present invention, in step a1), the amount of the partial inorganic sol is preferably 40 to 60 parts by weight, specifically 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, 50 parts by weight, 51 parts by weight, 52 parts by weight, 53 parts by weight, 54 parts by weight, 55 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, or 60 parts by weight, based on 20 to 50 parts by weight of the primary fiber.

In the above preparation process provided by the present invention, the step a1) specifically includes: firstly, mixing and ball-milling a primary fiber raw material, a secondary fiber raw material and part of inorganic sol, and then continuously mixing and ball-milling a mixed ball-milling product and aluminum magnesium silicate to obtain a coating base material. Wherein the diameter of a grinding body used for ball milling is preferably 5-10 mm; the ball-milling ball material mass ratio is preferably (2-3): 1; the time for the first ball milling is preferably 10-15 min; the time for continuing ball milling is preferably 3-5 min.

The invention optimizes the component composition of the honeycomb ceramic carrier surface enhanced coating, so that the obtained coating has extremely excellent thermal shock resistance; after the thermal shock resistant coating is coated on the surface of a honeycomb ceramic carrier, the thermal shock resistance of the honeycomb ceramic carrier can reach 850 ℃ for three times of circulation without cracks. More specifically, the honeycomb ceramic carrier surface enhanced coating provided and prepared by the invention has the following advantages:

1) by adopting two-stage fiber compounding, the fiber length and the fiber diameter are reasonably graded, and the thermal shock resistance of the coating is obviously improved;

2) the cordierite fine powder and the electric melting quartz powder which are preferably adopted as the inorganic powder have low thermal expansion coefficients, so that the cracking of the coating caused by thermal expansion is avoided;

3) the raw materials are all inorganic materials, so that the paint is stable in long-term storage, the problem that the coating is deteriorated due to the fact that organic colloid is decomposed by bacteria in long-term storage is solved, and secondary smoke pollution of organic matters cannot be generated at high temperature.

The invention also provides a honeycomb ceramic carrier, which comprises a honeycomb ceramic carrier substrate, wherein the surface of the honeycomb ceramic carrier substrate is coated with the surface enhanced coating of the honeycomb ceramic carrier in the technical scheme, and the coating thickness is preferably 1-5 mm, and more preferably 3-5 mm. The surface of the honeycomb ceramic carrier provided by the invention is coated with the coating provided by the invention, so that the thermal shock resistance of the honeycomb ceramic carrier is greatly improved, and the thermal shock resistance of the honeycomb ceramic carrier can reach 850 ℃ for three times of circulation without cracks.

For the sake of clarity, the following examples are given in detail.

Example 1

1) Preparing a coating base material:

preparing 20 parts by weight of primary fiber, 3 parts by weight of secondary fiber, 40 parts by weight of inorganic sol and 2 parts by weight of magnesium aluminum silicate; wherein the primary fiber is alumina fiber (Al)₂O₃The content is more than or equal to 72 wt%, and Al₂O₃And SiO₂The total content of (B) is not less than 99.5 wt%, Fe₂O₃The content of (a) is less than or equal to 0.1 wt%), the fiber diameter is 2-4 μm, and the fiber length is 100-200 mm; the secondary fiber is alkali-free glass fiber (E-grade glass fiber, New Kandaff materials Co., Ltd., Jiangsu), the fiber diameter is 3-5 μm, and the fiber length is 3-5 mm; the inorganic sol is silicon dioxide sol, and the solid content is 30 wt%;

ball-milling the primary fiber, the secondary fiber and the inorganic sol in a stirring ball mill; wherein the ball milling medium is corundum balls, the diameter of the corundum balls is 5-10 mm, the ball-material ratio is 2:1, and the ball milling time is 10 min; after the ball milling is finished, the length of the fiber in the ball milling mixture reaches 200-250 μm; then, adding magnesium aluminum silicate, and continuously mixing and ball-milling for 3min to obtain the coating base material.

2) Preparing the surface enhanced coating of the honeycomb ceramic carrier:

adding 130 parts by weight of silica sol and 520 parts by weight of inorganic powder into 65 parts by weight of the coating base material prepared in the step 1); wherein the solid content of the silica sol is 40 wt%, and the inorganic powder is cordierite fine powder with the particle size of 200 meshes; and (3) uniformly stirring the materials to obtain the honeycomb ceramic carrier surface reinforcing coating.

Coating the honeycomb ceramic surface reinforcing coating on the surface of a honeycomb ceramic carrier, wherein the honeycomb ceramic carrier is an SCR (Selective catalytic reduction) honeycomb ceramic carrier (the specification is 266.7 multiplied by 152.4-400/4) of Shandong Ofu environmental protection science and technology Co., Ltd, and the coating thickness is 3 mm; after the coating is coated, the thermal shock resistance of the honeycomb ceramic carrier can reach 850 ℃ for three times of circulation without cracks (the detection method is based on GB/T25994-2010).

Example 2

1) Preparing a coating base material:

preparing 50 parts by weight of primary fiber, 1 part by weight of secondary fiber, 60 parts by weight of inorganic sol and 5 parts by weight of magnesium aluminum silicate; wherein the primary fiber is high-aluminum fiber (Al)₂O₃The content is more than or equal to 53wt percent, and SiO is₂Content is more than or equal to 46 wt%, Fe₂O₃The content of (a) is less than or equal to 0.2 wt%), the fiber diameter is 2-4 μm, and the fiber length is 100-200 mm; the secondary fiber is medium-alkali glass fiber (grade C glass fiber, New Kandaff materials Co., Ltd., Jiangsu), the fiber diameter is 5-10 μm, and the fiber length is 5-10 mm; the inorganic sol is zirconia sol, and the solid content is 30 wt%;

ball-milling the primary fiber, the secondary fiber and the inorganic sol in a stirring ball mill; wherein the ball milling medium is corundum balls, the diameter of the corundum balls is 5-10 mm, the ball-material ratio is 3:1, and the ball milling time is 15 min; after the ball milling is finished, the length of the fiber in the ball milling mixture reaches 50-150 mu m; then, adding magnesium aluminum silicate, and continuously mixing and ball-milling for 5min to obtain the coating base material.

2) Preparing the surface enhanced coating of the honeycomb ceramic carrier:

adding 193 parts by weight of silica sol and 309 parts by weight of inorganic powder into 116 parts by weight of the coating base material prepared in the step 1); wherein the solid content of the silicon dioxide sol is 30 wt%, and the inorganic powder is fused quartz powder with the particle size of 1000 meshes; and (3) uniformly stirring the materials to obtain the honeycomb ceramic carrier surface reinforcing coating.

Coating the honeycomb ceramic surface reinforcing coating on the surface of a honeycomb ceramic carrier, wherein the honeycomb ceramic carrier is an SCR (Selective catalytic reduction) honeycomb ceramic carrier (the specification is 266.7 multiplied by 152.4-400/4) of Shandong Ofu environmental protection science and technology Co., Ltd, and the coating thickness is 3 mm; after the coating is coated, the thermal shock resistance of the honeycomb ceramic carrier can reach 850 ℃ for three times of circulation without cracks (the detection method is based on GB/T25994-2010).

Example 3

1) Preparing a coating base material:

preparation of30 parts by weight of primary fiber, 3 parts by weight of secondary fiber, 55 parts by weight of inorganic sol and 3 parts by weight of magnesium aluminum silicate; wherein the first-stage fiber is high-purity fiber (Al)₂O₃The content is more than or equal to 45 wt%, SiO₂Not less than 54 wt% of Fe₂O₃The content of (a) is less than or equal to 0.2 wt%), the fiber diameter is 2-4 μm, and the fiber length is 100-200 mm; the secondary fiber is medium-alkali glass fiber (grade C glass fiber, New Kandaff materials Co., Ltd., Jiangsu), the fiber diameter is 5-10 μm, and the fiber length is 3-5 mm; the inorganic sol is zirconia sol, and the solid content is 30 wt%;

ball-milling the primary fiber, the secondary fiber and the inorganic sol in a stirring ball mill; wherein the ball milling medium is corundum balls, the diameter of the corundum balls is 5-10 mm, the ball-material ratio is 2:1, and the ball milling time is 13 min; after the ball milling is finished, the length of the fiber in the ball milling mixture reaches 150-200 mu m; then, adding magnesium aluminum silicate, and continuously mixing and ball-milling for 4min to obtain the coating base material.

2) Preparing the surface enhanced coating of the honeycomb ceramic carrier:

adding 136 parts by weight of silica sol and 227 parts by weight of inorganic powder into 91 parts by weight of the coating base material prepared in the step 1); wherein the solid content of the silicon dioxide sol is 40 wt%, and the inorganic powder is fused quartz powder with the particle size of 325 meshes; and (3) uniformly stirring the materials to obtain the honeycomb ceramic carrier surface reinforcing coating.

Coating the honeycomb ceramic surface reinforcing coating on the surface of a honeycomb ceramic carrier, wherein the honeycomb ceramic carrier is an SCR (Selective catalytic reduction) honeycomb ceramic carrier (the specification is 266.7 multiplied by 152.4-400/4) of Shandong Ofu environmental protection science and technology Co., Ltd, and the coating thickness is 3 mm; after the coating is coated, the thermal shock resistance of the honeycomb ceramic carrier can reach 800 ℃ for three times of circulation without cracks (the detection method is based on GB/T25994-2010).

Example 4

1) Preparing a coating base material:

preparing 45 parts by weight of primary fiber, 2 parts by weight of secondary fiber, 55 parts by weight of inorganic sol and 4 parts by weight of magnesium aluminum silicate; wherein the primary fiber is zirconium-containing fiber (Al)₂O₃The content is more than or equal to 36wt％，SiO₂Content is not less than 48 wt%, ZrO₂Content not less than 15 wt%, Fe₂O₃The content of (a) is less than or equal to 0.1 wt%), the fiber diameter is 2-4 μm, and the fiber length is 100-200 mm; the secondary fiber is alkali-free glass fiber (E-grade glass fiber, New Kandaff materials Co., Ltd., Jiangsu), the fiber diameter is 5-10 μm, and the fiber length is 5-10 mm; the inorganic sol is zirconia sol, and the solid content is 30 wt%;

ball-milling the primary fiber, the secondary fiber and the inorganic sol in a stirring ball mill; wherein the ball milling medium is corundum balls, the diameter of the corundum balls is 5-10 mm, the ball-material ratio is 2.5:1, and the ball milling time is 14 min; after the ball milling is finished, the length of the fibers in the ball milling mixture reaches 120-200 mu m; then, adding magnesium aluminum silicate, and continuously mixing and ball-milling for 3min to obtain the coating base material.

2) Preparing the surface enhanced coating of the honeycomb ceramic carrier:

adding 141 parts by weight of silica sol and 247 parts by weight of inorganic powder into 106 parts by weight of the coating base material prepared in the step 1); wherein the solid content of the silica sol is 40 wt%, and the inorganic powder is cordierite fine powder with the particle size of 600 meshes; and (3) uniformly stirring the materials to obtain the honeycomb ceramic carrier surface reinforcing coating.

Coating the honeycomb ceramic surface reinforcing coating on the surface of a honeycomb ceramic carrier, wherein the honeycomb ceramic carrier is an SCR (Selective catalytic reduction) honeycomb ceramic carrier (the specification is 266.7 multiplied by 152.4-400/4) of Shandong Ofu environmental protection science and technology Co., Ltd, and the coating thickness is 3 mm; after the coating is coated, the thermal shock resistance of the honeycomb ceramic carrier can reach 850 ℃ for three times of circulation without cracks (the detection method is based on GB/T25994-2010).

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.