阅读说明：本技术 一种高锰高碳可焊金属陶瓷块及其增强的辊套和制备方法 (High-manganese high-carbon weldable metal ceramic block, enhanced roller sleeve and preparation method thereof ) 是由 佟伟平 李萍 高菁 于 2020-06-02 设计创作，主要内容包括：一种高锰高碳可焊金属陶瓷块及其增强的辊套和制备方法,该高锰高碳可焊金属陶瓷块包括合金化后的增强颗粒、基体材料和复合添加颗粒；合金化后的增强颗粒为高锰粉末包覆的陶瓷颗粒,基体材料为高锰高碳的铬铁耐磨材料,由于Mn为弱碳化物形成元素,基体中的Mn少部分同Cr形成M<Sub>7</Sub>C<Sub>3</Sub>型碳化物,大部分的Mn分布于基体中形成奥氏体相区,使其具有可焊性；因为Mn的加入使得陶瓷颗粒与基体发生有效的冶金结合。将合金化后的增强颗粒、复合添加颗粒与基体材料进行液相烧结,将得到的高锰高碳可焊金属陶瓷块焊接于辊套的指定位置；最后浇铸成辊套设备。此方法制备的辊套具有高强度、操作方法简单、增强块体完全固定于指定位置和方便修复等优点。(A high-manganese high-carbon weldable metal ceramic block, a roll sleeve reinforced by the same and a preparation method thereof are provided, wherein the high-manganese high-carbon weldable metal ceramic block comprises alloyed reinforced particles, a base material and composite additive particles; the alloyed reinforced particles are ceramic particles coated by high-manganese powder, the matrix material is a high-manganese high-carbon ferrochrome wear-resistant material, and because Mn is a weak carbide forming element, a small part of Mn in the matrix and Cr form M 7 C 3 The most of Mn is distributed in the matrix to form an austenite phase region, so that the matrix has weldability; because the addition of Mn allows an efficient metallurgical bonding of the ceramic particles to the matrix. Carrying out liquid phase sintering on the alloyed reinforced particles, the alloyed composite additive particles and a base material, and welding the obtained high-manganese high-carbon weldable metal ceramic block at the specified position of the roller sleeve; and finally casting the roll sleeve equipment. The roll sleeve prepared by the method has the advantages of high strength, simple operation method, complete fixation of the reinforced block at a designated position, convenience in repair and the like.)

1. A high manganese high carbon weldable cermet block, wherein the high manganese high carbon weldable cermet block includes alloyed reinforcing particles, a matrix material and composite additive particles;

the alloyed reinforced particles are particles with a core-shell structure formed by coating ceramic particles with Mn powder or MnO powder, wherein the Mn powder: ceramic particles 1: (1-3); or MnO powder: ZTA ceramic particles 1: (4-10); the ceramic particles are ZTA and/or Al₂O₃；

The matrix material is a high-carbon high-manganese wear-resistant material, and the matrix material comprises the following raw material powders in percentage by mass: c: 1.0-6%, Si: 0.1-1.0%, Cr: 4-30% and Mn: 10-25%, Mo: 0-10%, W: 0-10%, V: 0-20%, Ni: 0-30%, Cu: 0-20%, B: 0-20%, P is less than or equal to 0.02%, S is less than or equal to 0.01%, and the balance is iron and inevitable impurities, wherein the alloy elements contained in the matrix comprise at least one of Cr, Mo, W, V, Ni, Cu and B;

alloying the reinforced particles according to the volume ratio: 1, (1-4) base material raw material powder;

the composite additive particles are one or more of WC particles, SiC particles, VC particles and TiC particles; by volume ratio, ZTA: (3-5) to (0-1) by volume ratio of Al to the composite additive particles₂O₃: the composite additive particles are (3-5) and (0-1).

2. The high manganese high carbon weldable cermet block of claim 1, wherein the Mn powder and the MnO powder have a powder particle size of 60 to 1000 mesh, the ceramic particles have a particle size of 0.1 to 3mm, and the composite additive particles have a particle size of 0.1 to 3 mm.

3. The high manganese high carbon weldable cermet block of claim 1, wherein the matrix structure of the high manganese high carbon weldable cermet block is austenite and martensite, wherein the volume percent austenite is > 20%.

4. A method of making a high manganese, high carbon weldable cermet block according to any one of claims 1 to 3 including the steps of:

(1) after cleaning the ceramic particles, uniformly coating Mn powder and/or MnO powder on the surfaces of the cleaned ceramic particles according to a ratio by using a binder, and then placing the ceramic particles in an argon atmosphere protective furnace for sintering to obtain a sintered framework material;

crushing the sintered framework material into single particles to obtain alloyed reinforced particles;

(2) uniformly mixing the alloyed reinforced particles, the alloyed composite additive particles and the base material raw material powder according to the proportion to obtain a mixed material;

(3) and putting the mixed material into a crucible, and sintering in an argon atmosphere protective furnace to obtain the high-manganese high-carbon weldable metal ceramic block.

5. The method for preparing the high-manganese high-carbon weldable cermet block of claim 4, wherein in the step (1), the binder is one or more of water glass, PVA, PAM or phenolic resin, and the usage amount thereof is 5-15% of the total mass of the ceramic particles.

6. The method for preparing a high manganese high carbon weldable cermet block of claim 4, wherein in step (1), the sintering process parameters in the argon atmosphere furnace are: heating to 800-850 ℃ at the speed of 8-10 ℃/min, and keeping the temperature for 60-90 min; heating to 900-.

7. The method for preparing a high manganese high carbon weldable cermet block of claim 4, wherein in step (3), the sintering process of the argon atmosphere protective furnace is: heating to 800-850 ℃ at the speed of 4-6 ℃/min, and keeping the temperature for 1-3 h; heating to 1200-1600 ℃ at the speed of 5-8 ℃/min, preserving the heat for 5-10 h, and then cooling along with the furnace.

8. A high manganese high carbon weldable cermet block-reinforced sleeve comprising the high manganese high carbon weldable cermet block of any one of claims 1-3 and a casting material, wherein the high manganese high carbon weldable cermet block is located on an outer surface of the high manganese high carbon weldable cermet block-reinforced sleeve, wherein the high manganese high carbon weldable cermet block accounts for 10% to 40% by volume of the outer surface of the high manganese high carbon weldable cermet block-reinforced sleeve, and wherein the high manganese high carbon weldable cermet block is located at one of:

the first method comprises the following steps: after a reinforcing steel bar framework is formed by welding reinforcing steel bars, welding high-manganese high-carbon weldable metal ceramic blocks on the outer surface of the reinforcing steel bar framework by using welding rods, wherein the high-manganese high-carbon metal ceramic blocks are fixed on the outer surface of the reinforcing steel bar framework in a mode of welding layer by layer from the bottom layer;

and the second method comprises the following steps: forming a framework of the high-manganese high-carbon metal ceramic block in a mode that welding rods are used for increasing layer by layer from the bottom layer to the top layer, and placing the framework on the inner surface of a sand mold;

the casting material is one of low-carbon steel, high-manganese steel and high-chromium cast iron, and the chemical components of the materials and the mass percentages of the chemical components are as follows:

low carbon steel: c: 0.02 to 0.045 percent, and the balance of iron and inevitable impurities;

high manganese steel: c: 0.75-1.45%, Mn: 11-25%, Si 0.1-0.5%, Cr: 0.5 to 2.0% of P, 0 to 0.02% of S, and the balance Fe and inevitable impurities;

high-chromium cast iron: c: 2% -6%, Mn: 0.5 to 1.0%, 0.1 to 1.0% of Si, Ni: 1.0-2.5%, Cr: 11-30%, Mo: 1.0-3.0%, Cu: 0.5 to 1.2%, 0 to 0.01% of P, 0 to 0.06% of S, and the balance Fe and inevitable impurities.

9. The method of making a high manganese, high carbon weldable cermet block-reinforced roll shell of claim 8 including the steps of:

step 1: fixation of high manganese high carbon weldable cermet blocks

(1) Preparation of Sand molds

Selecting sand mould raw materials, uniformly mixing the sand mould raw materials according to a ratio, preparing a sand mould according to the shape of a roller sleeve reinforced by a high-manganese high-carbon weldable metal ceramic block to be prepared, and drying the inner surface of the molded sand mould to obtain a dried sand mould;

(2) according to the setting position of the high-manganese high-carbon weldable metal ceramic block in the roller sleeve enhanced by the high-manganese high-carbon weldable metal ceramic block to be prepared, the setting is carried out, and the arrangement mode of the high-manganese high-carbon weldable metal ceramic block is as follows: in each layer, two adjacent high-manganese high-carbon weldable metal ceramic blocks are arranged at intervals;

(3) according to the position and arrangement of the high-manganese high-carbon weldable metal ceramic block, distributing and fixing the high-manganese high-carbon weldable metal ceramic block in a honeycomb structure by adopting low-carbon steel welding rods or nickel-containing cast iron welding rods, and obtaining a framework material of the high-manganese high-carbon weldable metal ceramic block;

step 2: casting of roll sleeves

(1) Pushing a sand mold for welding a framework material of the high-manganese high-carbon weldable metal ceramic block into a blast furnace, and preheating at 220-650 ℃ for 1-7 hours to obtain a preheated sand mold;

(2) injecting the smelted casting material into the preheated sand mold, and naturally cooling to room temperature to obtain a cooled roller sleeve; wherein the casting temperature is 1300-1600 ℃;

and step 3: heat treatment of integral roll shell

(1) Removing the sand mold on the outer surface of the cooled roller sleeve, putting the roller sleeve into a blast furnace for integral high-temperature diffusion annealing treatment, and then air-cooling to obtain an annealed roller sleeve; wherein the annealing temperature is 1000-1350 ℃, and the annealing time is 8-12 h;

(2) quenching the annealed roller sleeve to obtain a quenched roller sleeve; wherein the quenching temperature is 950-1050 ℃, and the temperature is kept for 8-10 h;

(3) tempering the quenched roller sleeve to obtain a high-manganese high-carbon weldable metal ceramic block reinforced roller sleeve; wherein the tempering temperature is 220-550 ℃, and the heat preservation is carried out for 8-12 h.

10. The method for preparing the roll shell reinforced by the high-manganese high-carbon weldable cermet blocks according to claim 9, wherein in step 1(2), the distance between two adjacent high-manganese high-carbon weldable cermet blocks in the same layer in the honeycomb structure is 2cm to 10cm, wherein the area occupied by the high-manganese high-carbon weldable cermet blocks is 10% to 40% of the area of the outer surface of the roll surface.

Technical Field

The invention relates to a high-manganese high-carbon weldable metal ceramic block, a reinforced roller sleeve and a preparation method thereof, belonging to the technical field of metal-based composite materials and wear-resistant materials.

Background

The roll surface material applied to the fields of mines, cement and the like has different wear failure degrees due to the effects of long-term impact, friction, cutting and the like, so that the service life of the roll surface material is shortened. At present, the commonly used roll surfaces mainly comprise a high-chromium cast iron roll surface, a surfacing roll surface and a wear-resistant roll surface reinforced by a metal ceramic block. High chromium cast iron roll surface material with a large amount of M₇C₃The matrix of the carbide and the martensite has excellent wear resistance and is widely used, but the high-chromium cast iron has poor surface toughness and is easy to generate cracks in the using process, so that the surface of the roller is scrapped. The surfacing welding is to weld the wear-resistant material on the surface of the roller surface under the condition of high temperature, and the roller surface has higher strengthThe wear resistance and the easy repair, etc. But the roller surface is easy to have the defects of cracks, inclusions, incomplete penetration and the like in the long-term use process, so that the surfacing wear-resistant layer falls off. When the detached build-up layer is repeatedly repaired, the production cycle is prolonged. Under the condition of severe abrasion working condition, a wear-resistant roller surface enhanced by a metal ceramic block is usually selected, and the wear-resistant service life of the roller surface is far longer than that of a high-chromium cast iron roller surface and a surfacing roller surface. However, in the process of abrasion, when the roller surface is partially damaged or generates larger gaps, the abrasion-resistant roller surface enhanced by the metal ceramic blocks is not easy to repair in a welding mode, and the roller sleeve is scrapped in advance. The main reasons why the cermet blocks in the roller shell cannot be repaired by welding are as follows: 1. in the existing wear-resistant roller sleeve reinforced by the metal ceramic block, the metal and the ceramic cannot realize complete metallurgical interface combination, and the interface is cracked under the action of thermal stress; 2. in the existing metal ceramic block, a matrix is made of high-chromium cast iron, so that the welding performance is poor, and the metal ceramic block is easy to crack in the welding and repairing process.

Therefore, how to invent a cermet block which can realize welding repair and realize metallurgical interface bonding of metal and ceramic is a problem to be solved urgently. Based on the reasons, the invention develops the high-manganese high-carbon weldable metal ceramic block reinforced wear-resistant roller sleeve, thereby prolonging the service life of the roller sleeve and improving the application universality.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a high-manganese high-carbon weldable metal ceramic block, a reinforced roller sleeve and a preparation method thereof. The high-manganese high-carbon weldable metal ceramic block comprises alloyed reinforced particles and a base material, wherein the alloyed reinforced particles are ZTA and/or Al coated by high-manganese powder₂O₃Preparing a framework material with the surface coated with high manganese by a liquid phase sintering method, and crushing the framework material to obtain alloyed ceramic particles; the matrix material is a high-manganese high-carbon ferrochrome wear-resistant material, and because Mn is a weak carbide forming element, a small part of Mn in the matrix forms M with Cr₇C₃The most of Mn is distributed in the matrix to form an austenite phase region, so that the matrix hasThe welding property is provided; due to the addition of Mn element in the matrix, the ZTA particles and the matrix material in the metal ceramic block have wettability, so that the ceramic particles in the metal ceramic block are effectively and metallurgically bonded with the matrix. And carrying out liquid phase sintering on the alloyed reinforcing particles, the alloyed composite additive particles and the matrix material to obtain the high-manganese high-carbon weldable metal ceramic block. Welding the high-manganese high-carbon weldable metal ceramic block at the specified position of the roller sleeve; and finally casting the roll sleeve equipment. The roll sleeve prepared by the method has the advantages of higher strength, simple operation method, complete fixation of the reinforced block at a designated position, convenience in repair and the like.

The invention is realized by adopting the following technical scheme:

the invention relates to a high-manganese high-carbon weldable metal ceramic block, which comprises alloyed reinforcing particles, a base material and composite additive particles;

the alloyed reinforced particles are particles with a core-shell structure formed by coating ceramic particles with manganese powder or manganese oxide powder, wherein the manganese powder comprises the following components in percentage by mass: ceramic particles 1: (1-3); or MnO powder: ZTA ceramic particles 1: (4-10); the ceramic particles are ZTA and/or Al₂O₃；

The matrix material is a high-carbon high-manganese wear-resistant material, and the matrix material comprises the following raw material powders in percentage by mass: c: 1.0-6%, Si: 0.1-1.0%, Cr: 4-30% and Mn: 10-25%, Mo: 0-10%, W: 0-10%, V: 0-20%, Ni: 0-30%, Cu: 0-20%, B: 0-20%, P is less than or equal to 0.02%, S is less than or equal to 0.01%, and the balance is iron and inevitable impurities, wherein the alloy elements contained in the matrix comprise at least one of Cr, Mo, W, V, Ni, Cu and B;

alloying the reinforced particles according to the volume ratio: 1, (1-4) base material raw material powder;

the composite additive particles are one or more of WC particles, SiC particles, VC particles and TiC particles; by volume ratio, ZTA: (3-5) to (0-1) by volume ratio of Al to the composite additive particles₂O₃: the composite additive particles are (3-5) and (0-1).

Wherein the powder granularity of the Mn powder and the MnO powder is 60-1000 meshes, the particle size of the ceramic particles is 0.1-3 mm, and the particle size of the composite additive particles is 0.1-3 mm.

The high-manganese high-carbon weldable metal ceramic block is in one of a cylinder, a cuboid, a square, a hexagonal prism and an irregular shape according to actual application conditions.

The invention relates to a preparation method of a high-manganese high-carbon weldable metal ceramic block, which comprises the following steps:

(1) after cleaning the ceramic particles, uniformly coating Mn powder and/or MnO powder on the surfaces of the cleaned ceramic particles according to a ratio by using a binder, and then placing the ceramic particles in an argon atmosphere protective furnace for sintering to obtain a sintered framework material;

crushing the sintered framework material into single particles to obtain alloyed reinforced particles;

(2) uniformly mixing the alloyed reinforced particles, the alloyed composite additive particles and the base material raw material powder according to the proportion to obtain a mixed material;

(3) and putting the mixed material into a crucible, and sintering in an argon atmosphere protective furnace to obtain the high-manganese high-carbon weldable metal ceramic block.

In the step (1), the binder is one or more of water glass (sodium silicate), PVA (polyvinyl alcohol), PAM (polyacrylamide) or phenolic resin, and the total amount of the binder is 5-15% of the total mass of the ceramic particles.

In the step (1), the sintering process parameters in the argon atmosphere protection furnace are as follows: heating to 800-850 ℃ at the speed of 8-10 ℃/min, and keeping the temperature for 60-90 min; heating to 900-1400 ℃ at the speed of 4-6 ℃/min, preserving heat for 3-10 h, and cooling along with the furnace.

In the step (2), the mixing time for uniform mixing is 3-10 h.

In the step (3), the sintering process of the argon atmosphere protection furnace comprises the following steps: heating to 800-850 ℃ at the speed of 4-6 ℃/min, and keeping the temperature for 1-3 h; heating to 1200-1600 ℃ at the speed of 5-8 ℃/min, preserving the heat for 5-10 h, and then cooling along with the furnace.

The invention relates to a roll sleeve reinforced by a high-manganese high-carbon weldable metal ceramic block, which is roll sleeve equipment prepared by fixing the high-manganese high-carbon weldable metal ceramic block at an appointed position of the roll sleeve in a welding mode and in a casting material mode, and can be applied to the fields of cement, mines and the like under severe working conditions.

The roll sleeve reinforced by the high-manganese high-carbon weldable metal ceramic block comprises the high-manganese high-carbon weldable metal ceramic block and a casting material, wherein the high-manganese high-carbon weldable metal ceramic block is positioned on the outer surface of the roll sleeve reinforced by the high-manganese high-carbon weldable metal ceramic block, the volume percentage of the high-manganese high-carbon weldable metal ceramic block in the outer surface of the roll sleeve reinforced by the high-manganese high-carbon weldable metal ceramic block is 10% -40%, and the setting position of the high-manganese high-carbon weldable metal ceramic block is one of the following two types:

the first method comprises the following steps: after a reinforcing steel bar framework is formed by welding reinforcing steel bars, welding high-manganese high-carbon weldable metal ceramic blocks on the outer surface of the reinforcing steel bar framework by using welding rods, wherein the high-manganese high-carbon metal ceramic blocks are fixed on the outer surface of the reinforcing steel bar framework in a mode of welding layer by layer from the bottom layer;

and the second method comprises the following steps: the framework of the high-manganese high-carbon metal ceramic block is formed in a mode that welding rods are used for increasing layer by layer from the bottom layer to the top layer, and the framework is placed on the inner surface of the sand mold.

The casting material is one of low-carbon steel, high-manganese steel and high-chromium cast iron, and the chemical components of the materials and the mass percentages of the chemical components are as follows:

low carbon steel: c: 0.02 to 0.045 percent, and the balance of iron and inevitable impurities;

high manganese steel: c: 0.75-1.45%, Mn: 11-25%, Si 0.1-0.5%, Cr: 0.5 to 2.0% of P, 0 to 0.02% of S, and the balance Fe and inevitable impurities;

high-chromium cast iron: c: 2% -6%, Mn: 0.5 to 1.0%, 0.1 to 1.0% of Si, Ni: 1.0-2.5%, Cr: 11-30%, Mo: 1.0-3.0%, Cu: 0.5 to 1.2%, 0 to 0.01% of P, 0 to 0.06% of S, and the balance Fe and inevitable impurities.

The invention relates to a preparation method of a high-manganese high-carbon weldable metal ceramic block reinforced roller sleeve, which comprises the following steps:

step 1: fixation of high manganese high carbon weldable cermet blocks

(1) Preparation of Sand molds

Selecting sand mould raw materials, uniformly mixing the sand mould raw materials according to a ratio, preparing a sand mould according to the shape of a roller sleeve reinforced by a high-manganese high-carbon weldable metal ceramic block to be prepared, and drying the inner surface of the molded sand mould to obtain a dried sand mould;

(2) according to the setting position of the high-manganese high-carbon weldable metal ceramic block in the roller sleeve enhanced by the high-manganese high-carbon weldable metal ceramic block to be prepared, the setting is carried out, and the arrangement mode of the high-manganese high-carbon weldable metal ceramic block is as follows: in each layer, two adjacent high-manganese high-carbon weldable metal ceramic blocks are arranged at intervals;

(3) according to the position and arrangement of the high-manganese high-carbon weldable metal ceramic block, distributing and fixing the high-manganese high-carbon weldable metal ceramic block in a honeycomb structure by adopting low-carbon steel welding rods or nickel-containing cast iron welding rods, and obtaining a framework material of the high-manganese high-carbon weldable metal ceramic block;

step 2: casting of roll sleeves

(1) Pushing a sand mold for welding a framework material of the high-manganese high-carbon weldable metal ceramic block into a blast furnace, and preheating at 220-650 ℃ for 1-7 hours to obtain a preheated sand mold;

(2) injecting the smelted casting material into the preheated sand mold, and naturally cooling to room temperature to obtain a cooled roller sleeve; wherein the casting temperature is 1300-1600 ℃;

and step 3: heat treatment of integral roll shell

(1) Removing the sand mold on the outer surface of the cooled roller sleeve, putting the roller sleeve into a blast furnace for integral high-temperature diffusion annealing treatment, and then air-cooling to obtain an annealed roller sleeve; wherein the annealing temperature is 1000-1350 ℃, and the annealing time is 8-12 h;

(2) quenching the annealed roller sleeve to obtain a quenched roller sleeve; wherein the quenching temperature is 950-1050 ℃, and the temperature is kept for 8-10 h;

(3) tempering the quenched roller sleeve to obtain a high-manganese high-carbon weldable metal ceramic block reinforced roller sleeve; wherein the tempering temperature is 220-550 ℃, and the heat preservation is carried out for 8-12 h.

In the step 1(1), the sand mold comprises the following raw materials in percentage by mass: molding sand: 75-80%, clay: 10-14% of sand, and the balance of water, wherein the molding sand is one or a mixture of zircon sand, corundum sand and chromite sand.

In the step 1(1), the drying is carried out at the temperature of 300-700 ℃ for 2-8 h.

In the step 1(2), in the honeycomb structure, the spacing distance between two adjacent high-manganese high-carbon weldable metal ceramic blocks in the same layer is 2-10 cm, wherein the area occupied by the high-manganese high-carbon weldable metal ceramic blocks is 10-40% of the area of the outer surface of the roller surface; wherein, the thickness of the outer surface of the roller surface is preferably 3 cm-5 cm.

In the step 1(3), the welding mode of the high-manganese high-carbon weldable metal ceramic block is shielded metal arc welding, and the welding surface needs to be cleaned before welding so as not to influence the ignition of the electric arc and the quality of a welding seam.

In the step 1(3), the diameter of the nickel-containing cast iron welding rod is 4-5 mm.

In the step 2(2), the casting material is one of low-carbon steel, high-manganese steel and high-chromium cast iron, and the chemical components of the materials and the mass percentages of the chemical components are as follows:

low carbon steel: c: 0.02 to 0.045 percent, and the balance of iron and inevitable impurities.

High manganese steel: c: 0.75-1.45%, Mn: 11-25%, Si 0.1-0.5%, Cr: 0.5 to 2.0% of P, 0 to 0.02% of S, and the balance Fe and inevitable impurities;

high-chromium cast iron: c: 2% -6%, Mn: 0.5 to 1.0%, 0.1 to 1.0% of Si, Ni: 1.0-2.5%, Cr: 11-30%, Mo: 1.0-3.0%, Cu: 0.5 to 1.2%, 0 to 0.01% of P, 0 to 0.06% of S, and the balance Fe and inevitable impurities.

In the step 2(2), the smelted casting material is obtained by smelting the casting material raw material at 1400-1700 ℃.

In the using process, when the roll sleeve roll surface material reinforced by the high-manganese high-carbon weldable metal ceramic block causes a gap of more than 100mm due to high impact, iron passing and hard object cutting, the high-manganese high-carbon weldable metal ceramic block prepared by the invention has better repair weldability, and when an austenite phase region formed by adding a large amount of Mn element in the matrix of the high-manganese high-carbon weldable metal ceramic block and a martensite phase region formed in the cooling solidification process are matched as follows: when the austenite content is more than 20 percent, the prepared high-manganese high-carbon weldable metal ceramic block has welding performance. Therefore, the gap can be repaired with the wear-resistant welding rod.

The matrix structure of the high-manganese high-carbon weldable metal ceramic block is austenite and martensite, wherein the volume percentage content of the austenite is more than 20%, and the balance is the martensite.

It can be proved that the weldability of the high-manganese high-carbon weldable metal ceramic block greatly improves the service life of the roller sleeve.

In the repair welding process of the roller sleeve reinforced by the high-manganese high-carbon weldable metal ceramic block, the types of usable wear-resistant welding rods are as follows: one of EDPCrMo-A3-03, EDPMn6-15, EDPCrMo-A4-03, EDPCrMoV-A2-15, EDPCrSi-B, EDMn-A-16, EDCrMn-B-16/EDCrMn-B-15 and EDRCrMoWV-A2-15.

Compared with the prior art, the high-manganese high-carbon weldable metal ceramic block, the enhanced roller sleeve and the preparation method thereof have the following characteristics:

(1) the preparation method is simple in preparation process, easy to operate, capable of repairing defects in the using process on line and convenient for industrial large-scale production;

(2) the method of the invention is used for preparing ZTA ceramic particles and/or Al₂O₃Coating high manganese powder on the surface of the ceramic particles to ensure that ZTA ceramic particles and/or Al₂O₃The surface of the ceramic particles is metallized, so that the wettability between the molten metal and the matrix is improved.

(3) The high Mn powder and iron form an infinite mutual soluble solid solution element, on the first hand, the manganese steel is retained to room temperature in the matrix in an austenite form, and the toughness of the matrix material is improved;

in the second aspect, Mn forms a small amount of Mn-based carbides, such as M, in the matrix₇C₃The carbide is formed, so that the abrasion resistance of the matrix is enhanced;

in a third aspect, the addition of Mn will oxidize to MnO through MnO-Al₂O₃The binary phase diagram analysis of (1) shows that MnO can be mixed with Al in ZTA ceramics₂O₃The ZTA ceramic is bonded to the metallization layer through this layer by the reaction, which is shown as follows:

MnO+Al₂O₃—MnO∙Al₂O₃

(4) the high manganese component is added into the base material of the high manganese high carbon weldable metal ceramic block, and part of manganese elements of the high manganese component exist in carbide, and the other part of manganese elements are distributed in the base. Therefore, the matrix material is in an austenite region, thereby avoiding the cracking phenomenon in the matrix due to carbide in the welding process. The high-manganese high-carbon weldable metal ceramic block can be fixed on the outer surface of the roller sleeve in a welding mode by using a low-carbon steel welding rod, a nickel-based cast iron welding rod or other welding rods, so that the risk that the high-manganese high-carbon weldable metal ceramic block is washed away or moved in position in the casting process is avoided.

(5) After the roll sleeve reinforced by the high-manganese high-carbon weldable metal ceramic block is subjected to heat treatment, the overall performance of the roll sleeve is improved, and meanwhile, the phenomenon of cracking does not occur.

Drawings

FIG. 1 is a top plan view and an elevation view of a high manganese high carbon weldable cermet block welded to the outer surface of a roll shell; wherein, (a) is a top view and (b) is a front view;

FIG. 2 is a front view of a high manganese high carbon weldable cermet block welded to an inner surface of a steel reinforcement cage;

in fig. 1 and 2, 1-sand mold; 2-high manganese high carbon weldable cermet block; 3, welding rods; and 4, welding the framework with the steel bars.

FIG. 3 is a schematic view of a welding process for on-line repair of roll-face material;

FIG. 4 is a schematic of a completion of an in-line repair of a roll face material using a wear resistant electrode;

in fig. 3 and 4, 5 — a wear resistant electrode; 6-damage gap; 7-composite matrix; 8-repair of the damaged gap.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.

In the following examples, the main chemical components of the mild steel electrode or nickel-containing cast iron electrode used are shown in Table 1:

TABLE 1 chemical composition/% (mass fraction) of mild steel or nickel-containing cast iron welding rod