Synthesis of nanocrystalline WCu powders via freeze-drying and hydrogen reduction
Source abstract
Abstract
The preparation of nanocrystalline W Cu powders plays a significant role in the production of high-performance W Cu composites. The chemical reduction method is a promising approach for industrial nano-powder synthesis. However, the influence of various reduction parameters on the morphology and grain size of the reduced powders, as well as their underlying mechanisms, have remained unclear. In this study, we investigated the effects of reduction steps, temperature, duration, hydrogen inflow rate, and copper content on the grain size of the composite powders and disclosed the related mechanisms. Through optimization of reaction parameters, W Cu powders with grain sizes below 50 nm were obtained. Moreover, the utilization of the synthesized nanocrystalline W Cu powders as raw materials yielded a bulk W 20Cu composite with an ultrahigh hardness of 600 HV 30.
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