Method for preparing WC (wolfram carbide) powder by utilizing CH4 to reduce and carbonize WO3

Abstract

The invention provides a method for preparing WC (wolfram carbide) powder by utilizing CH4 to reduce and carbonize WO3. The method effectively utilizes methane to directly reduce and carbonize WO3 nanopowder to obtain a WC powder product. The source of the methane gas is wide and the cost is low. Highly activated carbon and hydrogen of methane pyrolysis directly participate in reduction and carbonization reaction, WO3 can be reduced and carbonized under a low-temperature environment of 600 DEG C to 800 DEG C for 30 to 90 minutes, and thereby the WC powder product is prepared. The reduction and carbonization temperature is low, the time is short, the energy consumption and cost of production can be remarkably reduced, the method is used for implementing the large-scale low-cost industrial production of WC powder, moreover, the prepared WC powder has small average grain size, large specific surface area, good mechanical properties and good sphericity, the requirement of industrial application can be effectively met, and the WC powder can be used for preparing high-performance ultrafine-grain hard cemented carbide and highly activated wolfram carbide catalyst.

Description

Technical field [0001] The invention relates to the technical field of cemented carbide powder metallurgy, in particular to a CH 4 Reduction and carbonization of WO 3 Method of preparing WC powder. Background technique [0002] Tungsten carbide (WC) has a high melting point (2870℃) and high density (15.77 g·cm) 3 ), high microhardness (17300MPa), good wear resistance, strong ability to absorb rays, low thermal expansion coefficient (3.84×10 -6 / K), good electrical and thermal conductivity, strong corrosion resistance and surface electronic properties similar to platinum. Tungsten carbide powder (WC) is the main raw material for the production of cemented carbide. It is also used to replace precious metals such as platinum as a catalyst in organic reactions. In order to improve the comprehensive mechanical properties of WC-based cemented carbide and the catalytic activity of tungsten carbide powder, refining the grain size of tungsten carbide powder is an effective way to improve ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that undecomposed polymer or free carbon can still be found in the final product, which can affect product performance

However, when the reaction temperature is below 1000°C, the coexistence of tungsten and tungsten carbide in the powder limits its application.

[0016] It can be seen that the existing tungsten carbide powder preparation methods have problems such as long production process, high temperature, high energy consumption and comprehensive cost, and difficulty in large-scale industrial application.

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