Method for preparing heterogeneous texture cemented carbide

Abstract

The invention relates to a preparation method for a hard alloy with an uneven structure. The weight content of the powder of a metal cobalt in the material components thereof is 6 to 16 percent; the rests are two types of tungsten carbide with different granularities; the batching demands for the two types of tungsten carbide with different granularities include: the average granularity of the thick tungsten carbide is 4 to 7Mum; the average granularity of the thin tungsten carbide is 1 to 1.5Mum; the weight contents of the two types of tungsten carbide with different granularities are that the proportion of the thick tungsten carbide and the thin tungsten carbide is 0.55 to 3.6:1. The hard alloy with a bimodal structure prepared by the method of the invention has high intensity and rigidness; the rigidness is 91HBA; the anti-bending intensity is 3100MPa; the demands for the spherical gear and the compound sheet of the hard alloy can be met; compared with the spherical gear and the compound sheet of the hard alloy prepared by the prior art, the service life and the effect are greatly improved. Besides, the use efficiency of a product is improved and the production cost of the product is reduced.

Description

technical field [0001] The invention belongs to the technical field of hard alloys, and in particular relates to a preparation method of hard alloys with a non-uniform structure, in order to achieve the purpose of synchronously realizing high strength and high hardness of hard alloys. Background technique [0002] The main technical problem encountered in the preparation of cemented carbide is that it is difficult to achieve high strength and high hardness simultaneously. When it has high strength, it often has low hardness and poor wear resistance; when it has high hardness, it often has low strength and poor toughness. For this reason, research on various cemented carbide production methods is going on, and the production of cemented carbide buttons and composite sheets is no exception. In the existing production process of heterogeneous cemented carbide, the particle size range of the two types of tungsten carbide is too wide, and the particle size difference between the ...

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Problems solved by technology

In the existing production process of heterogeneous cemented carbide, the particle size range of the two types of tungsten carbide is too wide, and the particle size difference between the coarse and fine particles is too large, the particle size of the coarse particle is 20-30 μm, and the particle size of the fine particle is 1.2- 1.8μm, although the hardness and bending strength of the cemented carbide products produced by this method have been improved to a certain extent, and can meet the requirements for preparing snow shovels, it still cannot meet the requirements of cemented carbide buttons and cemented carbide composite sheets

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