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A powder metallurgy preparation method of step-by-step sintered carbide/steel double-layer structure composite material
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A technology of sintered carbide and hard alloy, which is applied in the field of composite material technology preparation, can solve the problems of low strength, poor reliability, and easy cracking of carbide hard alloy, etc., and achieve high-precision results
Active Publication Date: 2022-04-08
湖南英捷高科技有限责任公司
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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
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example 1
[0047]A. Select steel material powder, carbide carbide material powder and adhesive:
[0048] The steel material powder is nickel-based alloy steelInconel713 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] Prepare adhesive: by mass percentage, polyo...
example 2
[0057] A. Select steel material powder, carbide carbide material powder and adhesive:
[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.
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Abstract
The invention relates to a powdermetallurgy preparation method for step-by-step forming of cemented carbide / steel double-layer structure composite material, which belongs to the technical preparation field of composite materials. In the present invention, firstly, the steel powder material and the carbide hard alloypowder are mixed and kneaded with the binder respectively, and granulated to obtain the steel powder material feeding and the carbide hard alloy material feeding, and then the steel powder material is fed to the The raw materials and carbidecemented carbide materials are injected into the mold cavity step by step to obtain the product green body; then part of the binder in the green body is removed by catalytic degreasing, and finally co-sintered and densified to obtain the carbide hard alloy. Alloy / steel double layer structural composite. The preparation process of the invention is simple and controllable, the obtained product has excellent performance, and is convenient for large-scale industrial application.
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...
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