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A powder metallurgy preparation method for localized reinforced composite materials

A technology of reinforced composite materials and powder metallurgy, which is applied in the field of powder metallurgy preparation of localized reinforced composite materials, can solve the problems of inapplicability, reduced performance of matrix materials, and growth of matrix material grains, so as to achieve difficult germination and reduce interface Effect of stress, uniform particle distribution

Active Publication Date: 2018-11-02
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vacuum sintering technology often causes the grain growth of the matrix material and reduces the performance of the matrix material. It is mainly used to prepare composite materials with a higher melting point of the matrix, and is not suitable for the preparation of ordinary iron-based wear-resistant composite materials.
In short, the current preparation methods of localized reinforced surface composites still have great limitations, and new preparation methods need to be continuously developed

Method used

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  • A powder metallurgy preparation method for localized reinforced composite materials
  • A powder metallurgy preparation method for localized reinforced composite materials
  • A powder metallurgy preparation method for localized reinforced composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation of localized reinforced ball mill liner wear-resistant inserts

[0034] The matrix material is a wear-resistant medium alloy steel with good strength and toughness. The reinforced area of ​​the insert is selected steel-bonded cemented carbide, the reinforced particles are WC particles, and the metal binder is reduced iron powder; the shape of the reinforced area in the surface of the composite material is Distributed as figure 2 As shown, the depth of the reinforced area is 6mm, and the composite material green forming mold is designed accordingly. The preparation of the composite material includes the following steps:

[0035] 1) Preparation of cemented carbide powder

[0036] Mix WC particles with a particle size of 106-120 μm and reduced iron powder with a particle size of 86-106 μm. The content of WC particles accounts for 80% of the mass of the mixture.

[0037] 2) Ball milling mixture of cemented carbide powder

[0038] Put the prepared powder mix...

Embodiment 2

[0048] Example 2: Preparation of wear-resistant inserts for localized and enhanced vertical roller mill discs

[0049] The matrix material is high manganese steel, the reinforced area of ​​the insert is selected steel-bonded cemented carbide, the reinforced particles are WC and TiC particles, and the metal binder is high-speed steel powder; the shape and distribution of the reinforced area in the surface of the composite material are as follows Figure 4 As shown, the depth of the reinforced area is 5mm, and the composite material green forming mold is designed accordingly. The preparation of the composite material includes the following steps:

[0050] 1) Preparation of cemented carbide powder

[0051] Take WC and TiC particles with a particle size of 58-75 μm and mix them with high-speed steel powder with a particle size of 38-58 μm. The content of WC particles accounts for 70% of the mass of the mixture; the content of TiC particles accounts for 15% of the mass of the mixture.

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Abstract

The invention belongs to the technical field of composite preparation, and particularly relates to a powder metallurgy preparation method of a localization reinforced composite for manufacturing wear-resisting quick-wear parts of mining and building machines. The method comprises the following steps that (1) tungsten carbide powder and titanium carbide powder are used as reinforced particles, reduced iron powder and high-speed steel powder are used as a metal binder, and hard alloy powder is prepared according to a certain proportion; (2) the prepared hard alloy powder is put into a ball mill, and a process control agent is added for ball milling and mixing; and (3) a forming agent is added into the hard alloy powder subjected to uniform ball milling and mixing, and then the steps of mixing, prepressing, smashing, sieving particle making and the like are carried out. In a composite layer of the composite prepared through the method, discontinuous reinforcement areas are uniformly distributed in a continuous matrix area, cracks are not prone to being produced and expanding in the service process of the composite, and strength-toughness matching performance of the composite is achieved well; and the wear resistance of the composite can be obviously improved, and the service life of the composite can be obviously prolonged.

Description

Technical field [0001] The invention belongs to the technical field of composite material preparation, and specifically relates to a powder metallurgical preparation method of a localized reinforced composite material used for manufacturing wear-resistant and vulnerable parts of mines and construction machinery. Background technique [0002] In mining, construction, metallurgy and other industries, serious wear and tear of equipment parts are common, such as pallets for transporting minerals, hammers for crushing minerals, grinding rollers, grinding discs, and liners for grinding minerals. Severe abrasion and bear a certain impact load. Ceramic particle-reinforced iron-based surface composite materials can not only exert the strength and toughness advantages of the matrix material, but also exhibit the wear resistance of ceramic particles; therefore, it has a good prospect of being applied to severe wear conditions. [0003] Traditional ceramic particle-reinforced iron-based surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/02B22F3/14B22F3/24
CPCB22F3/004B22F3/02B22F3/14B22F3/24B22F2003/248B22F2998/10B22F1/0003B22F2009/043B22F2009/045
Inventor 侯书增付鸽廖映华胥云李志荣
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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