Method of preparing ultrafine alloy powder by coprecipitation coreduction

Abstract

A process for preparing the superfine alloy powder by codeposition-coreduction method includes such steps as liquid-phase codeposition to prepare the precursor powder of each component in alloy, calcining to obtain nano-class composite metallic oxide powder, and reducing by H2 or decomposed ammonia in tubular reducing furnace while alloying to obtain superfine alloy powder.

Description

technical field

[0001] The invention belongs to the technical field of metal alloy powder preparation, and in particular provides a co-precipitation-co-reduction method for preparing superfine alloy powder. Background technique

[0002] Fe, Co, Ni, Cu, Mo and other powders and their alloy powders, such as: Fe-Ni, Ni-Cu, Fe-Ni-Cu, Ni-Co, Fe-Ni-Mo, etc., are widely used in various fields of powder metallurgy All walks of life. The atomization method is a common method for preparing alloy powders. Its advantage is that alloy powders of various components can be synthesized by smelting. However, the alloy powders prepared by the atomization method are generally coarse in particle size and have poor sintering properties. Some powder metallurgy products need to be sintered at a lower sintering temperature, such as hot-pressed sintered diamond tools. Excessively high sintering temperatures will lead to diamond graphitization, so it is necessary to use alloy powders with a particle...