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Preparation process of composite preform

A composite material and preparation technology, which is applied in the field of preparing composite material preforms by using alumina ceramic particles and tungsten carbide ceramic particles, can solve the problems of reduced service life, low toughness, fracture or peeling of components, and improve wear resistance , Improve the impact resistance and facilitate the operation

Inactive Publication Date: 2012-05-23
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface layer of the particle-reinforced surface composite material, that is, the composite layer, has high hardness but low toughness. When used in actual working conditions, the surface composite layer will be broken or peeled off in advance due to impact, resulting in a sharp reduction in the service life of the components.

Method used

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  • Preparation process of composite preform
  • Preparation process of composite preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Firstly, mechanically mix the non-wetting ceramic particles and metal powder with the iron-based alloy with absolute ethanol to obtain a mixture, wherein the mass ratio of the non-wetting ceramic particles and metal powder with the iron-based alloy is 1:0.5, without The amount of water ethanol added is 2% of the mass of the ceramic particles, the particle size of the metal powder is 150-400 mesh, and the ceramic particle that does not infiltrate with the iron-based alloy is alumina with a particle size of 8-60 mesh;

[0023] 2) Next, the mixture is filled into a columnar graphite mold, and the particles are dried at 80°C for 30 minutes;

[0024] 3) Finally, put the dried particles together with the graphite mold into a vacuum sintering furnace for sintering. The vacuum degree is 0.01Pa, the sintering temperature is 1250°C, and the temperature is kept for 60 minutes. After cooling, the ceramic particles are embedded in the metal, and the overall structure is porous. C...

Embodiment 2

[0026] 1) First, mechanically mix the non-wetting ceramic particles and metal powder with absolute ethanol to obtain a mixture, wherein the mass ratio of the non-wetting ceramic particles and metal powder with the iron-based alloy is 1:0.8, without The amount of water ethanol added is 3% of the mass of the ceramic particles, the particle size of the metal powder is 150-400 mesh, and the ceramic particle that does not infiltrate with the iron-based alloy is BN with a particle size of 8-60 mesh;

[0027] 2) Next, fill the mixture into a graphite block mold and dry the particles at 80°C for 30 minutes;

[0028] 3) Finally, put the dried particles together with the graphite mold into a vacuum sintering furnace for sintering. The vacuum degree is 0.01Pa, the sintering temperature is 1280°C, and the temperature is kept for 50 minutes. After cooling, the ceramic particles are embedded in the metal, and the overall structure is porous. Composite preforms.

Embodiment 3

[0030] 1) First, mechanically mix the non-wetting ceramic particles and metal powder with the iron-based alloy with absolute ethanol to obtain a mixture, wherein the mass ratio of the non-wetting ceramic particles and metal powder with the iron-based alloy is 1:1.5, without The amount of water ethanol added is 5% of the mass of the ceramic particles, the particle size of the metal powder is 150-400 mesh, and the ceramic particle that does not infiltrate with the iron-based alloy is TiN with a particle size of 8-60 mesh;

[0031] 2) Next, fill the mixture into a honeycomb graphite mold, and dry the particles at 80°C for 30 minutes;

[0032] 3) Finally, put the dried particles together with the graphite mold into a vacuum sintering furnace for sintering. The vacuum degree is 0.01Pa, the sintering temperature is 1320°C, and the temperature is kept for 40 minutes. After cooling, the ceramic particles are embedded in the metal, and the overall structure is porous. Composite preform...

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Abstract

The invention relates to a preparation process of a composite perform. The invention is characterized in that the preparation process comprises the following steps: taking alloy powder, using absolute ethyl alcohol to prepare ceramic particles which can infiltrate or not infiltrate an iron-based alloy and metal powder into mixture; filling the mixture into a specially designed graphite die; drying, and vacuum-sintering; and cooling, and then obtaining the composite perform the whole of which is in a porous structure. The process for preparing the composite perform of the invention dose not use any binder, dose not generate gases, is in favor of cast-penetration, is convenient for mass production, is simple in operation and has strong universality, and lays a foundation for preparing a particle enhanced iron-based skin layer composite workpiece by using a casting-penetrating method. The perform of the invention is placed at the end surface side of a cast form, then molten metal is poured, and the molten metal penetrates the perform to form the composite in situ, so that the selective local enhancement of a wear resistant component can be achieved, thereby significantly improving the wear resistance of the component and prolonging the service life of the component.

Description

technical field [0001] The invention belongs to the process of preparing a prefabricated body in the process of preparing particle-reinforced iron-based surface layer composite materials, and particularly relates to a process for preparing a composite material prefabricated body by using alumina ceramic particles and tungsten carbide ceramic particles. Background technique [0002] In the actual service process, especially for general wear-resistant parts, it is mainly on specific parts, such as the surface of components, that are subject to wear. When these parts are worn out or the size is worn out, the entire part will be scrapped. Therefore, in order to improve the wear resistance of components, the current method is to prepare a layer of particle-reinforced composite material on the working surface of the component or prepare a layer of particle-reinforced composite material locally by using the cast infiltration process. In this way, the composite material with high we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/00C22C32/00B22D19/02
Inventor 高义民史芳杰戚文军农登李烨飞郑开宏尹宏飞邢建东黄勇
Owner XI AN JIAOTONG UNIV
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