A kind of preparation method of fine-grain high-hardness tungsten-cobalt-nickel alloy

Abstract

The invention provides a manufacturing method of fine-grain high-hardness tungsten cobalt nickel alloy. The manufacturing method comprises the following steps of 1 respectively weighing tungsten powder, cobalt power and nickel powder, 2 adding the tungsten powder, cobalt power and nickel powder into a mixing machine for mixing to obtain mixed powder, 3 pressing the mixed powder to form a press blank, 4 sintering the press blank to obtain a sintered blank and then performing vacuum annealing on the sintered blank to obtain the fine-grain high-hardness tungsten cobalt nickel alloy. The size of the manufactured fine-grain high-hardness tungsten cobalt nickel alloy prepared by means of the manufacturing method is not larger than 20 microns, the hardness is not smaller than 35, and the fine-grain high-hardness tungsten cobalt nickel alloy is small in grain and high in densification degree.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of fine-grained high-hardness tungsten-cobalt-nickel alloy. Background technique [0002] Tungsten-based alloys have the characteristics of high density, high strength and hardness, good electrical and thermal conductivity, low thermal expansion coefficient, strong radiation absorption ability, high pressure resistance, and excellent electrical corrosion resistance, which are conducive to machining, welding, forging and heat treatment. , plays an irreplaceable role in the fields of national defense, aerospace, electronic information, energy, metallurgy, machining and nuclear industry, occupies an important position in the national economy, and has become one of the most active research fields in the field of materials science . [0003] In recent years, with the development of science and technology, higher requirements have been put fo...

AI Technical Summary

Problems solved by technology

Generally speaking, the HRC hardness of tungsten-based alloys is between 24 and 32. At present, tungsten-based alloy products with high hardness special-shaped parts or plates are required in the market, and the alloy HRC hardness is required to be ≥ 35. Now we can only rely on forging deformation treatment to achieve this. Hardness, but the complex production process and large equipment investment lead to high production costs, low profits, and lack of market competitiveness; at the same time, some products are limited by extremely small size or complex shape, so it is not suitable to use deformation strengthening to improve hardness. Not yet available for production

[0004] In order to achieve the purpose of improving the hardness of tungsten-based alloys, there are also reports to increase the hardness of alloys by adding certain elements: Yan Jianwu et al. added 0.5% carbon powder to tungsten-based alloys, and the HRC hardness of the alloys can reach 41, but the alloy crystals in the sintering process The grain grows abnormally, and it is prone to structural defects such as uneven structure and holes; Tang Xinwen and others improved the hardness of W-Ni-Fe tungsten-based alloy by adding a small amount of cobalt, but the HRC hardness only reached 26; US Patent 5462576 research It shows that Co has a certain influence on the hardness of W-Ni-Co alloy. In this patent, Ni:Co>1.0, but the HRC hardness of the alloy prepared by this method is ≤32. The above methods cannot meet the requirements of high hardness and no structural defects of the product.

Images