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Powder metallurgy preparation method for step-by-step formed cemented carbide hard alloy/steel double-layer structure composite material

A technology of sintering carbide and hard alloy, which is applied in the field of composite material technology preparation, can solve the problems of low strength, easy deformation of steel, and easy cracking of carbide hard alloy, and achieve high precision and avoid deformation.

Active Publication Date: 2021-06-15
湖南英捷高科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Mechanical connection is to use high pressure to connect carbide carbide and steel together, and this connection method is a physical connection method, which has defects such as low strength, easy peeling, and poor reliability
Cladding is a preparation method that melts carbide cemented carbide and adheres to the steel surface under external heat sources such as plasma and laser. This method is limited in that the shape of the steel must be flat and smooth. Due to the high temperature of the heat source, the steel is easy to deform. And carbide cemented carbide is prone to cracks

Method used

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  • Powder metallurgy preparation method for step-by-step formed cemented carbide hard alloy/steel double-layer structure composite material
  • Powder metallurgy preparation method for step-by-step formed cemented carbide hard alloy/steel double-layer structure composite material
  • Powder metallurgy preparation method for step-by-step formed cemented carbide hard alloy/steel double-layer structure composite material

Examples

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Effect test

example 1

[0047] A. Select steel material powder, carbide carbide material powder and binder:

[0048]The steel material powder is nickel-based alloy steel Inconel713 powder, with an average particle size of 17.6 μm. The mass percentages of its main chemical elements are: C: 0.04%, Cr: 12.4%, Mo: 4.5%, Si: 0.8%, Al: 5.6%, Ti: 0.8%, Nb: 1.8%, Ni: the balance.

[0049] Carbide cemented carbide material powder is made of WC+TiC as the main material, where the mass fraction of TiC is 5%, and the average particle size of the main material is 7.2 μm; Ni60 alloy powder is used as the auxiliary material, with an average particle size of 19.4 μm. The mass percentage of the main chemical elements is: C : 0.8%, Cr: 16.4%, B: 3.5%, Si: 3.0%, Fe: 14%, Ni: balance. According to the mass percentage, the main material: auxiliary material = 13:7 is put into the tank and an appropriate amount of absolute ethanol is added to mix evenly and then dry.

[0050] Preparation binder: by mass percentage, polyo...

example 2

[0057] A. Select steel material powder, carbide carbide material powder and binder:

[0058] The steel material powder is martensitic stainless steel 0Cr17Ni4Cu4Nb powder with an average particle size of 12.6 μm. The mass percentages of its main chemical elements are: C: 0.07%, Cr: 16.8%, Mn: 0.8%, Si: 0.8%, Ni: 4.5%, Cu: 3.8%, Nb: 0.25%, Fe: balance.

[0059] The carbide cemented carbide material powder is made of WC, with an average particle size of 6.8 μm; Co-Cr alloy powder is used as an auxiliary material, with an average particle size of 10.6 μm. The mass percentages of the main chemical elements are: C: 1.2%, Cr: 29.5%, W: 3.8%, Si: 1.3%, Fe: 3.2%, Mo: 1.1%, Ni: 2.8%, Co: balance. According to the mass percentage, the main material: auxiliary material = 6:4, put it into a tank, add an appropriate amount of absolute ethanol, mix it evenly, and then dry it.

[0060] Preparation binder: by mass percentage, polyoxymethylene (POM): 85%; Polyethylene (PP): 10%; Polyolefin e...

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Abstract

The invention relates to a powder metallurgy preparation method of a step-by-step formed cemented carbide hard alloy / steel double-layer structure composite material, belongs to the technical field of composite material preparation. The method includes the steps that firstly, a steel powder material and carbide hard alloy powder are mixed and granulated with a binder to obtain a steel powder material feed and a carbide hard alloy material feed, and then the steel powder material feed and the carbide hard alloy material feed are sequentially injected into a mold cavity step by step through an injection molding technology to obtain a product green body; and part of the binder in the green body is removed through catalytic degreasing, and finally the carbide hard alloy / steel double-layer structure composite material is obtained through co-sintering densification. The powder metallurgy preparation method of the step-by-step formed cemented carbide hard alloy / steel double-layer structure composite material is simple and controllable, an obtained product is excellent in performance, and large-scale industrial application is facilitated.

Description

technical field [0001] The invention discloses a powder metallurgy preparation method for step-by-step forming sintered hard alloy / steel double-layer structure composite material, which belongs to the technical preparation field of composite materials. Background technique [0002] Cemented carbide has high hardness, strength, wear resistance and corrosion resistance. It is used in the manufacture of cutting tools, knives, drilling tools and wear-resistant parts. It is widely used in military industry, aerospace, machining, metallurgy, oil drilling , mining tools, electronic communications, construction and other fields, along with the development of downstream industries, the market demand for cemented carbide continues to increase. Due to the high brittleness of cemented carbide and the limitation of preparation methods, it is difficult to prepare large-scale and complex cemented carbide / steel double-layer composite materials. [0003] At present, the preparation of cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/00C22C29/04C22C29/06B22F7/02B22F3/10B22F3/22
CPCC22C1/051C22C29/067C22C29/04C22C29/005B22F7/02B22F3/225B22F3/1021
Inventor 余勇李益民常智敏王霄何浩胡幼华
Owner 湖南英捷高科技有限责任公司
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