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In-situ formation TiC reinforced high-chromium cast iron wear-resistant material and preparation method thereof

A high-chromium cast iron and wear-resistant material technology, which is applied in the field of in-situ formation of TiC ceramic particle-reinforced high-chromium cast iron composite materials, can solve the problems of hard-to-bond interfaces, roughness, low strength of high-chromium cast iron, etc., and achieve good comprehensive performance , Solve the effect of coarsening and fine particles

Inactive Publication Date: 2018-07-17
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But M 7 C 3 Carbide is very easy to form coarse grains, resulting in low strength and low toughness of high chromium cast iron, and it is easy to cause problems such as fracture during use
for refinement M 7 C 3 Microstructure, improve the wear resistance of high chromium cast iron, prolong the service life of parts, many measures such as rapid cooling to inhibit the growth of carbides (document 1, J.Mater.Sci.1983; 18:483), adding alloys and rare earth elements to refine the carbide M 7 C 3 (Document 2, Mater.Sci.Technol.1989; 5:918; Document 3, Mater.Sci.Eng.A 2005; 398:297; Document 4, Mater.Lett.2008; 62:3024) etc. are adopted, but Refine M 7 C 3 The effect is not obvious
Chinese patent (publication number CN107058856A) proposes a preparation method for preparing high chromium cast iron, including the preparation steps of furnace pretreatment, pouring, and heat treatment, which has a certain effect on improving the wear resistance of high chromium cast iron, but does not solve the problem of coarse carbides. The problem
In addition, adding Al to high chromium cast iron 2 o 3 , TiC, Si 3 N 4 , ZrO 2 Waiting for ceramic particles is also a good method, which can refine the microstructure to a certain extent and improve the wear resistance of the material, but the added ceramic particles are not evenly distributed in the matrix and it is difficult to form a strong ceramic / metal interface. Combining the interface has become a new problem

Method used

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  • In-situ formation TiC reinforced high-chromium cast iron wear-resistant material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0017] 1) Put Ti 3 AlC 2 and high chromium cast iron powder according to the mass ratio of 1:4 ingredients, weigh Ti 3 AlC 2 20 grams of powder, 80 grams of high chromium cast iron powder;

[0018] 2) Put the above-mentioned ingredients and agate balls into the ball mill tank according to the ball-to-material ratio of 2:1, and mix the ingredients for 5 hours;

[0019] 3) Put the uniformly mixed ingredients into a graphite mold, place the graphite mold in a high-temperature furnace, and raise the temperature of the furnace to 1500°C at a heating rate of 15°C / min, and then cool it down to 1200°C under an argon protective atmosphere. Keep it warm for 60 minutes, and finally cool down to room temperature with the furnace temperature to obtain a high-chromium cast iron composite material.

[0020] combine figure 1 It can be observed from the scanning electron microscope photos that the formed TiC particle size is 1-2 microns, the particles are spherical, and are uniformly disp...

Embodiment approach 2

[0022] 1) Put Ti 3 AlC 2 and high chromium cast iron powder according to the mass ratio of 1:19 ingredients, weighed Ti 3 AlC 2 5 grams of powder, 95 grams of high chromium cast iron powder;

[0023] 2) Put the above-mentioned ingredients and agate balls into the ball mill tank according to the ball-to-material ratio of 2:1, and mix the ingredients for 10 hours;

[0024] 3) Put the uniformly mixed ingredients into the graphite mold, place the graphite mold in a high-temperature furnace, under an argon protective atmosphere, raise the furnace temperature to 1450°C at a heating rate of 30°C / min, keep it warm for 5 minutes, and then cool down to 1200°C, keep warm for 60 minutes, and finally cool down to room temperature with the furnace temperature to obtain high-chromium cast iron composite material.

[0025] Obtaining the microstructure of the material as figure 1 As shown, the formed TiC particle size is 1-2 microns, the particle is spherical, and is uniformly dispersed i...

Embodiment approach 3

[0027] 1) Put Ti 3 AlC 2 and high chromium cast iron powder according to the mass ratio of 1:3 ingredients, weigh Ti 3 AlC 2 25 grams of powder, 75 grams of high chromium cast iron powder;

[0028] 2) Put the above-mentioned ingredients and agate balls into the ball mill tank according to the ball-to-material ratio of 2:1, and mix the ingredients for 8 hours;

[0029] 3) Put the uniformly mixed ingredients into the graphite mold, place the graphite mold in a high-temperature furnace, under an argon protective atmosphere, raise the furnace temperature to 1400°C at a heating rate of 20°C / min, keep it warm for 10 minutes, and then cool down to 1200°C, keep warm for 60 minutes, and finally cool down to room temperature with the furnace temperature to obtain high-chromium cast iron composite material.

[0030] Obtaining the microstructure of the material as figure 1 As shown, the formed TiC particle size is 1-2 microns, the particle is spherical, and is uniformly dispersed in ...

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Abstract

The invention discloses an in-situ formation TiC reinforced high-chromium cast iron wear-resistant material and a preparation method thereof. Specifically, the preparation method comprises the steps that Ti3AlC2 and high-chromium cast iron powder are taken as raw materials, wherein the content of Ti3AlC2 is 5-30wt.%; an agate ball and ingredients are put into a ball milling tank according to the weight ratio of 2:1 for mixing for 5-10 hours; the mixed ingredients are put into a graphite mould, the graphite mould is placed in a high-temperature furnace, under an argon atmosphere, the temperature of the furnace is increased to 1200-1500 DEG C by taking the heating rate of 5-30 DEG C / minute, after the temperature is kept for 0-30 minutes, then the temperature is cooled to 1000-1300 DEG C, meanwhile, the pressure of 0-30 MPa is applied to the powder in the mould, the temperature is kept for 30-90 minutes, and finally the temperature is cooled to room temperature along with the furnace temperature, and the TiC reinforced high-chromium cast iron composite material is obtained. The TiC particles in the material prepared by the method are fine and uniformly distributed in a base body, thestructure of the high-chromium cast iron is refined, relatively high ceramic / metal bonding interface is formed between the TiC and the base body, and the comprehensive performance of the composite material is improved. The method has the advantages that the used equipment is simple, the time for compounding the material is short, and the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of wear-resistant materials, in particular to a preparation method of forming TiC ceramic particle reinforced high-chromium cast iron composite material in situ. Background technique [0002] High chromium cast iron is an excellent wear-resistant material, which is widely used in crushing, grinding, extrusion, material conveying and other mechanical and metallurgical equipment, such as grinding rollers, liners, grinding balls, rolls, etc. The wear resistance of high chromium cast iron mainly comes from the carbide M in the matrix 7 C 3 Contribution of (M = Fe, Cr). But M 7 C 3 Carbide is very easy to form coarse grains, resulting in low strength and low toughness of high chromium cast iron, and it is easy to cause problems such as fracture during use. for refinement M 7 C 3 Microstructure, improve the wear resistance of high chromium cast iron, prolong the service life of parts, many measures such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/06C22C33/08
CPCC22C37/06C22C33/08
Inventor 李世波姜吉鹏陆晓刚胡树郡周洋李翠伟黄振莺翟洪祥
Owner BEIJING JIAOTONG UNIV
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