Process for preparing nano chromium carbide powder

Abstract

A process for preparing chromium carbide nano-particles includes such steps as dissolving Cr2O3 in organic solution, spray drying to obtain spherical hollow porous particles, calcining at 500-600 deg. C in protecting atmosphere, and carbonizing in H2 / CHCP at 850-1000 deg. C for 40-90 min.

Description

Technical field: [0001] The invention belongs to the preparation process of metal powder in the field of metallurgy, in particular to the preparation method of nanometer chromium carbide powder. Background technique: [0002] Chromium carbide has been widely used in industry as an ultrafine cemented carbide grain inhibitor and the main component of spray powder. At present, the preparation of chromium carbide generally adopts Cr 2 o 3 It is mixed with carbon black and carbonized, and the particle size of the obtained chromium carbide is micron. In industrial applications, chromium carbide powder with finer particle size and more uniform composition is often required. At present, when preparing ultra-fine cemented carbide, the particle size of WC powder is 0.2 to 0.4 microns. If the powder particle size is 2 to 5 microns, the chromium carbide powder is Grain inhibitor due to coarse grained Cr 3 C 2 The powder is smaller than the surface, the surface activation energy is ...

AI Technical Summary

Problems solved by technology

In industrial applications, chromium carbide powder with finer particle size and more uniform composition is often required. At present, when preparing ultra-fine cemented carbide, the particle size of WC powder is 0.2 to 0.4 microns. If the powder particle size is 2 to 5 microns, the chromium carbide powder is Grain inhibitor due to coarse grained Cr 3 C 2 The powder is smaller than the surface, the surface activation energy is low, and the atomic migration speed is slow, so its effect of inhibiting grain growth is difficult to fully exert, and the performance of ultrafine cemented carbide is difficult to further improve