Preparation method of WC-Co nano powder added with grain growth inhibitor

Abstract

The invention provides a preparation method of WC-Co nano powder added with a grain growth inhibitor, and belongs to the technical field of powder metallurgy and powder preparation. The preparation method comprises the following steps: ammonium metatungstate, cobalt nitrate, fuel, ammonium nitrate, metal salt with a needed amount of the added grain growth inhibitor and an organic carbon source are used as raw materials, and oxide / carbon composite powder is prepared by adopting a low-temperature combustion synthesis method; and then carbonization is carried out under atmosphere protection or vacuum to obtain the WC-Co nano powder mixed with the grain growth inhibitor. According to the preparation method, the low-temperature combustion synthesis method belongs to a liquid-phase synthesis method, molecular-level mixing is achieved, so that diffusion range of the carbon in the carbonization process is short, and the requirements for the reaction temperature requirement and the reaction time requirement are low; and in addition, the raw materials are simple to obtain, the equipment is simple, the process is fast, and large-scale production can be realized.

Description

technical field

[0001] The invention belongs to the field of powder metallurgy and relates to a method for preparing WC-Co nano powder, in particular to a method for preparing WC-Co nano powder added with a grain growth inhibitor. Background technique

[0002] WC-Co cemented carbide has a series of excellent properties such as high strength, high hardness, high thermal conductivity, high temperature resistance and corrosion resistance, so it has achieved great success in metal cutting, rock drilling, forming molds, wear-resistant parts and other industrial fields. widely used. Studies have shown that refining the grains of WC-Co cemented carbide can effectively improve its mechanical properties. To prepare ultra-fine-grained WC-Co cemented carbide, it is first necessary to prepare ultra-fine WC-Co cemented carbide powder. The traditional methods for preparing WC-Co nano-cemented carbide powder mainly include ball milling method and high temperature self-propagating combust...

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