阅读说明：本技术 一种基于Al2O3-SiO2-ZrO2体系陶瓷内衬的钢管及其制备方法 (Based on Al2O3-SiO2-ZrO2Steel pipe with ceramic lining and preparation method thereof ) 是由 庞玉华 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种基于Al-2O-3-SiO-2-ZrO-2体系陶瓷内衬的钢管及其制备方法,制备过程中在在单一铝热剂的基础上使用SiO-2与ZrO-2两种材料作为添加剂,以达到制备一种高致密度和断裂韧性陶瓷内衬复合管。制备过程中,首先称量并混合铝热剂和添加剂,烘干去除粉料中的水分,通过球磨将粉料混合均匀,铺入钢管内后通过燃烧,在钢管内部形成填充层,本发明提供了一种由ZrO-2和SiO-2按照一定质量比配置而成的添加剂,添加剂总量占粉料总质量的10％～15％；所选粉料经烘干、混合、填充并点燃后发生高温自蔓延反应合成陶瓷内衬复合钢管。(The invention discloses a catalyst based on Al 2 O 3 ‑SiO 2 ‑ZrO 2 A steel pipe with ceramic lining and its preparing process features that based on single thermite, SiO is used 2 And ZrO 2 The two materials are used as additives to prepare the ceramic lining composite pipe with high density and fracture toughness. In the preparation process, firstly, the thermite and the additive are weighed and mixed, the drying is carried out to remove the moisture in the powder, the powder is uniformly mixed by ball milling, and the mixture is led into a steel pipe and then ledForming a filling layer inside the steel pipe by over-burning, the invention provides a ZrO-based composite material 2 And SiO 2 The additive is prepared according to a certain mass ratio, and the total mass of the additive accounts for 10-15% of the total mass of the powder; the selected powder is dried, mixed, filled and ignited to generate high-temperature self-propagating reaction to synthesize the ceramic lining composite steel pipe.)

1. Based on Al₂O₃-SiO₂-ZrO₂The preparation method of the steel pipe with the ceramic lining is characterized by comprising the following steps:

step 1, weighing and mixing thermite and additive to form powder; the additive is SiO₂And ZrO₂；

Step 2, removing aluminum powder in the powder, and drying the rest powder;

step 3, ball milling and mixing aluminum powder and other dried powder;

step 4, performing ball milling to obtain powder of 1.3g/cm³～1.9g/cm³Filling into a steel pipe;

step 5, laying magnesium powder in the steel pipe filled with the powder, igniting the steel pipe until the fire is naturally extinguished, and forming Al in the steel pipe₂O₃-SiO₂-ZrO₂And (5) filling the layer.

2. Al-based alloy according to claim 1₂O₃-SiO₂-ZrO₂The preparation method of the steel pipe with the ceramic lining is characterized in that in the step 1, the mass percentage of the thermite in the powder is 88-96%, and the SiO content in the powder is₂And ZrO₂The mass ratio of the powder is 2-6%.

3. Al-based alloy according to claim 1₂O₃-SiO₂-ZrO₂The preparation method of the steel pipe with the ceramic lining is characterized in that in the step 1, the mass ratio of aluminum powder to ferric oxide in the thermite is 2: 5.

4. Al-based alloy according to claim 1₂O₃-SiO₂-ZrO₂The preparation method of the steel pipe with the ceramic lining is characterized in that in the step 2, the drying temperature is 120 ℃, and the drying time is 3 hours.

5. Al-based alloy according to claim 1₂O₃-SiO₂-ZrO₂The preparation method of the steel pipe with the ceramic lining is characterized in that in the step 4, the ball milling time is 12-24 hours.

6. Al-based alloy according to claim 1₂O₃-SiO₂-ZrO₂The preparation method of the steel pipe with the ceramic lining is characterized in that in the step 3, the steel pipe is vacuumized in the ball milling process.

7. Al-based alloy obtained by the production method according to any one of claims 1 to 6₂O₃-SiO₂-ZrO₂The steel pipe with the ceramic lining is characterized in that the pipe wall of the steel pipe comprises a base body layer, a transition layer and a ceramic layer from outside to inside.

8. Al-based according to claim 7₂O₃-SiO₂-ZrO₂The steel pipe with the ceramic lining is characterized in that the substrate layer is the steel pipe, the transition layer is reduced iron, and the ceramic layer is Al₂O₃。

[ technical field ] A method for producing a semiconductor device

The invention belongs to the field of pipeline transportation materials, and particularly relates to a pipeline transportation material based on Al₂O₃-SiO₂-ZrO₂A steel pipe with a ceramic lining and a preparation method thereof.

[ background of the invention ]

The ceramic lining composite steel pipe based on the self-propagating high-temperature synthesis technology is widely applied to industries such as petroleum, chemical engineering, metallurgy and the like by virtue of excellent wear resistance and corrosion resistance.

The basic principle of the high-temperature self-propagating technology is that molten metal and ceramic are generated by means of thermite reaction, and the ceramic lining composite pipe is finally formed by means of layered solidification under the action of gravity or centrifugal force by means of density difference of the molten metal and the ceramic; however, the composite pipe prepared by the single thermite has low density of multiple layers and poor toughness, and is easy to break and collapse in the processes of transportation and installation; the research results of the multiple-layer density by the existing common additives are published: the research finds that the proper amount of CrO₃、Ni、SiO₂The addition of (2) is favorable for improving the density of the multilayer, and when 7 wt% of CrO is added respectively₃When the Ni content is 18 wt%, the density of the ceramic layer is 96% and 96.5%, but the strength of the ceramic material is also reduced; 2 wt% SiO₂The addition of the aluminum alloy has the minimum influence on the strength of the multilayer, and can improve the density of the multilayer to 88 percent, compared with single Al₂O₃The multilayer is improved by more than 10 percent, but the expression of the research result of the toughness of the multilayer is not seen; in recent years, multilayer toughening becomes a research hotspot: ZrO (ZrO)₂Has high melting point and high hardness, can be changed from tetragonal phase to monoclinic phase, and can increase the toughness of the multilayer. 6 wt% ZrO₂Can improve the fracture toughness of the ceramic layer to 5.74 MPa.m^1/2[10]Is more than single Al₂O₃(fracture toughness 4.5 MPa. m^1/2) Increase limit, addition of 20 wt% ZrO₂Can improve the fracture toughness of the ceramic layer to 15.23 MPa.m^1/2[11]Is less than single Al₂O₃338% higher, but the manufacturing cost increases and the hardness of the ceramic layer decreases.

[ summary of the invention ]

The invention aims to overcome the defects of the prior art and provide an Al-based alloy₂O₃-SiO₂-ZrO₂The method makes up the problems of limited multi-layer toughening degree, higher cost and lower hardness of a toughened ceramic layer of a binary system at the present stage.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

based on Al₂O₃-SiO₂-ZrO₂The preparation method of the steel pipe with the ceramic lining comprises the following steps:

step 1, weighing and mixing thermite and additive to form powder; the additive is SiO₂And ZrO₂。

Step 2, removing aluminum powder in the powder, and drying the rest powder;

step 3, ball milling and mixing aluminum powder and other dried powder;

step 4, performing ball milling to obtain powder of 1.3g/cm³～1.9g/cm³Filling into a steel pipe;

step 5, laying magnesium powder in the steel pipe filled with the powder, igniting the steel pipe until the fire is naturally extinguished, and forming Al in the steel pipe₂O₃-SiO₂-ZrO₂And (5) filling the layer.

The invention is further improved in that:

preferably, in the step 1, the mass percentage of the thermite in the powder is 88-96%, and the mass percentage of the thermite in the powder is SiO₂And ZrO₂The mass ratio of the powder is 2-6%.

Preferably, in the step 1, the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

Preferably, in the step 2, the drying temperature is 120 ℃ and the drying time is 3h.

Preferably, in the step 4, the ball milling time is 12-24 hours,

preferably, step 3, vacuum treatment is performed in the ball milling process.

Al-based alloy prepared by any one of the preparation methods₂O₃-SiO₂-ZrO₂The steel pipe with the ceramic lining comprises a base layer, a transition layer and a ceramic layer from outside to inside.

Preferably, the substrate layer is the steel pipe, the transition layer is reduced iron, and the ceramic layer is Al₂O₃。

Compared with the prior art, the invention has the following beneficial effects:

the invention discloses a catalyst based on Al₂O₃-SiO₂-ZrO₂The preparation method of the steel pipe with the system ceramic lining uses SiO on the basis of single thermite in the preparation process₂And ZrO₂The two materials are used as additives to prepare the ceramic lining composite pipe with high density and fracture toughness. In the preparation process, firstly, the thermite and the additive are weighed and mixed, the drying is carried out to remove the moisture in the powder, the powder is uniformly mixed by ball milling, the powder is spread in a steel pipe and then is combusted, and a filling layer is formed inside the steel pipe₂And SiO₂The additive is prepared according to a certain mass ratio, and the total mass of the additive accounts for 10-15% of the total mass of the powder; the selected powder is dried, mixed, filled and ignited to generate high-temperature self-propagating reaction to synthesize the ceramic lining composite steel pipe. According to the invention, silicon dioxide and zirconium oxide are added when the composite layer is prepared, the zirconium oxide has the toughening characteristic, and the silicon oxide does not have the toughening characteristic, but the silicon oxide can increase the density of the ceramic layer, reduce the porosity, contribute to increasing the overall performance of the material and contribute to increasing the toughness.

Further, SiO used in the present invention₂And ZrO₂The addition amount is between 2% and 6%, and the manufacturing cost of the composite pipe can be reduced by using a small amount of additive.

The invention also discloses a catalyst based on Al₂O₃-SiO₂-ZrO₂The steel pipe with the ceramic lining is made of a composite steel pipe, and the pipe wall of the steel pipe comprises a base body layer, a transition layer and a ceramic layer from outside to inside. The substrate layer is the steel pipe, the transition layer is reduced iron, and the ceramic layer is Al₂O₃. The density and the fracture toughness of the ceramic lining prepared by the single thermite are poor; SiO is added to the steel pipe₂Can increase the density of the ceramic layer, ZrO₂The fracture toughness can be improved; in the utilization of SiO₂ZrO is added on the basis of increasing the density of the ceramic layer₂。ZrO₂The addition of the composite tube can play a role in increasing the fracture toughness of the ceramic layer and prolonging the service life of the composite tube engineering.

[ description of the drawings ]

FIG. 1 is a schematic structural view of a ceramic lined composite steel pipe according to the present invention;

FIG. 2 is a photomicrograph of the interface structure of the ceramic lined composite steel pipe of the present invention;

FIG. 3 is the ceramic layer structure of the ceramic lining composite steel pipe before using the additive according to the present invention;

FIG. 4 shows the ceramic layer structure of the ceramic-lined composite steel pipe after the additive is used according to the present invention;

FIG. 5 shows the identification result of the hardness indentation of the ceramic layer of the ceramic-lined composite steel pipe after the additive is used.

[ detailed description ] embodiments

The invention is described in further detail below with reference to the accompanying drawings:

in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention discloses a catalyst based on Al₂O₃-SiO₂-ZrO₂A steel pipe with a system ceramic lining and a preparation method thereof are disclosed, wherein the preparation process comprises the following steps:

s1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 88-96 percent, and the SiO is₂And ZrO₂The addition amount is 2-6%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: all the powder materials except the aluminum powder are dried in a constant-temperature drying oven at the drying temperature of 120 ℃ for 3 hours. .

S4: powder mixing: all aluminum powder and other dried powder are mixed in a ball mill for 12-24 hours, and the ball mill needs to be vacuumized.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.3g/cm³～1.9g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form a final product. The laying amount of the magnesium powder only needs to ensure that the powder covered inside is covered, the magnesium powder does not need to be too thick and can meet the requirement generally of 2-3mm, the heat released by the magnesium powder can be enough to initiate the self-propagating reaction after the magnesium powder is ignited, and the reaction can automatically occur until the reaction is finished without providing an external heating source after the self-propagating reaction starts.

SiO₂The introduction of the ceramic layer can greatly increase the density of the ceramic layer; ZrO (ZrO)₂Is helpful for increasing the fracture toughness of the ceramic layer. The composite pipe is prepared by adding two additives, in the prior art, the composite pipe is prepared by independently adding silicon oxide and zirconium oxide, or the composite pipe is prepared by adding silicon oxide, zirconium oxide and other additives, but the composite pipe is prepared by only adding the two additives of zirconium oxide and silicon oxide; the zirconia has the toughening characteristic, the silica does not have the toughening characteristic, but the silica can increase the density of a ceramic layer, reduce the porosity, contribute to increasing the overall performance of the material and also contribute to increasing the toughness, but the toughening effect is not as good as the effect of the invention only by adding the zirconia;

example 1

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 90 percent, and the SiO is₂And ZrO₂The addition amount is 5 percent; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: all the powder materials except the aluminum powder are dried in a constant-temperature drying oven at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: and mixing the aluminum powder and other dried powder in a ball mill for 18 hours, and vacuumizing the ball mill.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.5g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form a final product.

Referring to fig. 1, a schematic structural view of the ceramic-lined composite steel pipe prepared in this example is shown, wherein the inner layer prepared as shown in fig. 1 is Al₂O₃-SiO₂-ZrO₂The ceramic lining of the system and the outer layer of the ceramic lining are steel pipe matrixes.

FIG. 2 is a photomicrograph of the interface structure of the ceramic-lined composite steel pipe, from which it can be seen that the composite pipe is composed of three layers of pipe steel substrate-transition layer-ceramic layer, the transition layer is formed by the solidification of the reducing Fe liquid with higher density on the inner wall of the steel pipe first along with the cooling process, and the liquid Al₂O₃The ceramic layer is formed by adhering to the reduced iron liquid, the interface is uneven, and the inner wall of the pipe, the transition layer and the ceramic layer are mutually embedded to accord with a mechanical meshing mechanism. FIG. 4 shows the addition of ZrO₂The microstructure of the ceramic layer of the post-composite tube is compared with the microstructure of the ceramic layer of the post-composite tube only added with SiO₂The microstructure (see fig. 3) is uniform and has fewer defects. The ceramic layer hardness indentation identification result is shown in fig. 5, and the relationship between the ceramic layer micro-hardness and the fracture toughness is as follows:

K_IC＝0.004985·(E/H_V)^1/2·(P/C^3/2)

wherein KIC is the fracture toughness of the ceramic layer and has the unit of MPa.m 1/2; e is the Young modulus of the ceramic layer, and 350GPa is taken herein; p is the applied load in hardness measurement and has the unit of N; c is the length of the crack, also very large, in mm; HV is the hardness of the ceramic layer in GPa.

In this example, the crack length C was 0.006237mm, and the ceramic layer fracture toughness was 10.275MPa · m, which was determined by substituting the data into the formula^1/2Compared with the case of no addition of ZrO₂Front (6.25 MPa. m)^1/2) The increase is 64.4%.

Example 2

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 92 percent, and the SiO is₂Is added in an amount of 3%, ZrO₂The addition amount of (A) is 5%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: all the powder materials except the aluminum powder are dried in a constant-temperature drying oven at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: and mixing the aluminum powder and other dried powder in a ball mill for 20 hours, and vacuumizing the ball mill.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.9g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form the final product composite pipe.

Example 3

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder bagComprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 95 percent, and the SiO is₂Is added in an amount of 3%, ZrO₂The addition amount of (A) is 3%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: all the powder materials except the aluminum powder are dried in a constant-temperature drying oven at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: and mixing the aluminum powder and other dried powder in a ball mill for 12 hours, and vacuumizing the ball mill.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.3g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form the final product composite pipe.

Example 4

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 94 percent, and the SiO is₂Is added in an amount of 3%, ZrO₂The addition amount of (A) is 3%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: all the powder materials except the aluminum powder are dried in a constant-temperature drying oven at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: and mixing the aluminum powder and other dried powder in a ball mill for 24 hours, and vacuumizing the ball mill.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.4g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form the final product composite pipe.

Example 5

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 93 percent, and the SiO is₂Is added in an amount of 5%, ZrO₂The addition amount of (A) is 2%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: all the powder materials except the aluminum powder are dried in a constant-temperature drying oven at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: all powders were mixed in a ball mill for 13 hours, which required evacuation.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.5g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form the final product composite pipe.

Example 6

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 96 percent, and the SiO is₂Is added in an amount of 2%, ZrO₂The addition amount of (A) is 2%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: and drying the aluminum powder and other dried powder materials except the aluminum powder in a constant-temperature drying box at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: all powders were mixed in a ball mill for 15 hours, which required evacuation.

S5: powder filling: mixing the mixture evenlyThe powder is 1.6g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form the final product composite pipe.

Example 7

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 88 percent, and the SiO is₂Is added in an amount of 6% ZrO₂The addition amount of (A) is 6%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: and drying the aluminum powder and other dried powder materials except the aluminum powder in a constant-temperature drying box at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: all powders were mixed in a ball mill for 22 hours, which required a vacuum.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.7g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form the final product composite pipe.

Example 8

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 89 percent, and the SiO is₂Is added in an amount of 5%, ZrO₂The addition amount of (A) is 6%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: all the powder materials except the aluminum powder are dried in a constant-temperature drying oven at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: and mixing the aluminum powder and other dried powder in a ball mill for 14 hours, and vacuumizing the ball mill.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.8/g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form the final product composite pipe.

Example 9

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass ratio of the thermite in the powder is 90.5 percent, and the SiO is₂Is added in an amount of 3.5%, ZrO₂The addition amount of (A) is 6%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: and drying the aluminum powder and other dried powder materials except the aluminum powder in a constant-temperature drying box at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: all powders were mixed in a ball mill for 16 hours, which required a vacuum.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.5g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form the final product composite pipe.

Example 10

S1: pre-treating a pipeline, namely performing oil removal and rust removal treatment on a steel pipe to be treated;

s2: preparing powder: weighing and mixing the thermite and the additive; the powder comprises thermite and additive, wherein the additive is SiO₂And ZrO₂(ii) a Wherein the mass of the thermite in the powderThe ratio is 93.5%, SiO₂Is added in an amount of 4%, ZrO₂The addition amount of (A) is 2.5%; the mass ratio of the aluminum powder to the ferric oxide in the thermite is 2: 5.

S3: and (3) drying powder: all the powder materials except the aluminum powder are dried in a constant-temperature drying oven at the drying temperature of 120 ℃ for 3 hours.

S4: powder mixing: and mixing the aluminum powder and other dried powder in a ball mill for 23 hours, and vacuumizing the ball mill.

S5: powder filling: uniformly mixing the powder according to the proportion of 1.6g/cm³Filling the mixture into the pipeline.

S6: igniting: and (3) spreading a proper amount of magnesium powder on the top of the filled pipeline, igniting by open fire, after the ignition reaction, finishing the reaction and cooling to form the final product composite pipe.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.