Hard alloy resistant to high pressure and high temperature and preparation method thereof

Abstract

The invention belongs to the technical field of powder metallurgy, and particularly relates to a hard alloy resistant to high pressure and high temperature and a preparation method thereof. The hard alloy resistant to high pressure and high temperature comprises the following raw materials, by mass, 0.1-1.0 part of cobalt, 0.1-0.3 part of rhodium, 0.5-1 part of nickel carbonyl powder, 0.1-1.0 partof vanadium carbide, 10-20 parts of tantalum carbide, 0.6-1.0 part of niobium carbide, 2.0-4.0 parts of titanium carbide, 0.3-0.5 part of hafnium carbide, 0.1-0.5 part of aluminum nitride and 75-90 parts of tungsten carbide. In the hard alloy resistant to high pressure and high temperature, tungsten carbide is small in particle size and uniform in distribution, and the average grain size reaches0.10-0.25 micron; and meanwhile, the hard alloy resistant to high pressure and high temperature can reach HRA96.5, the bending strength can reach 3400 N/mm<2>, the compressive strength can reach 5200MPa, and good high pressure and high temperature resistant performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a high-pressure-resistant and high-temperature hard alloy and a preparation method thereof. Background technique [0002] Cemented carbide is an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. It has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance. Performance, known as "industrial teeth", widely used in tool materials, machining, aerospace, high pressure and high temperature tests and other fields. The hardness of cemented carbide commonly used in the domestic market can reach HRA86-93, and it remains basically unchanged even at a temperature of 500°C, and remains high at 1000°C. [0003] In the high-pressure and high-temperature test, because the test chamber can reach a pressure above 10-20GPa and a temp...

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Problems solved by technology

[0006] Both of the above two schemes produce hard alloys with good high-pressure and high-temperature performance, but the content of metal cobalt in the scheme is relatively high. Cobalt is a metal material that is expensive and has a certain impact on human health. Therefore, from the perspective of human health In consideration of reducing costs and improving the high-pressure and high-temperature performance of hard alloys, there is still a lack of a high-pressure and high-temperature hard alloy that can reduce test costs, improve work efficiency, and save rare metal resources for the country.

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