A method for grain refinement and size distribution homogenization of ultrafine-grained cemented carbide

A technology of grain size and hard alloy, which is applied in the field of industrial preparation of ultra-fine grain WC-Co hard alloy, can solve the problem of high surface energy and deformation storage energy of ultra-fine or nano WC-Co powder, and grain growth , poor uniformity of grain structure of cemented carbide bulk materials, etc., to achieve the effect of inhibiting the rapid growth of grains and eliminating deformation storage energy
CN105624447BActive Publication Date: 2017-09-22北硬科技香河有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
北硬科技香河有限公司
Publication Date
2017-09-22

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Abstract

The invention relates to a superfine crystal hard alloy grain refinement and size distribution uniformization method, belonging to the technical fields of hard alloys and powder metallurgy. The method comprises the following steps: by using tungsten oxide, cobalt oxide and carbon black as raw materials, carrying out in-situ reaction synthesis to prepare WC-Co composite powder; adding a small amount of Cr3C2 or Cr3C2 and VC in the WC-Co composite powder as a grain growth inhibitor; and carrying out ball milling mixing, passing through the powder through a screen, drying, carrying out long-term annealing treatment on the dried powder at lower temperature by using argon and hydrogen as protective gases, and carrying out pressure molding and low-pressure sintering to obtain the hard alloy block material. The method effectively inhibits the grain in the hard alloy of the superfine crystal or nanocrystal structure from quick growth in the sintering process, and enhances the microscopic structure uniformity of the hard alloy block material.
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Description

technical field

[0001] The invention relates to an industrialized preparation method of ultra-fine-grained WC-Co cemented carbide with both grain refinement and uniform grain size distribution, belonging to the technical field of cemented carbide and powder metallurgy. Background technique

[0002] WC-Co cemented carbide has been widely used in cutting tools, moulds, mining tools and wear-resistant parts due to its high hardness and wear resistance. With the upgrading of materials, the processing objects of cemented carbide have gradually become difficult-to-machine high-hardness and high-strength alloys. At the same time, with the rapid development of high-end industrial fields such as aerospace and microelectronics, the performance of cemented carbide has been raised. higher requirement. Ultrafine-grained cemented carbide has obvious advantages in hardness, wear resistance, strength, etc., and plays the role of the main force in the field of cutting processing. However, ...

Claims

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