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由于含超细显微结构的硬质合金材料具有改善机械性能这一潜在优势,使得人们继续致力于旨在生产这种材料的研究活动.目前业已将新烧结技术开始利用纳米结构WC—Co粉末.把平均烧结粒度减小到100nm以下的工作已初露曙光.尽管要获得真正有意义的WC—Co硬质合金尚需时日,但已迈出了第一步,即生产纳米结构粉末.这种用喷雾转化工艺生产的市售粉末由弥散在金属粘结相中的20—500nmWC晶粒构成.这些小WC晶粒比用传统碳化法生产粉末小一个数量级.本文探讨纳米结构WC—Co粉末开发现状以及喷雾转化工艺的生产能力,并论述了应用纳米结构粉末所面临的种种机遇.
The potential for improved mechanical properties of cemented carbide materials with ultrafine microstructures has led to ongoing research efforts aimed at the production of such materials.New sintering has now begun to take advantage of nano-structured WC-Co powders Much has already begun to be done to reduce the average sintered particle size to less than 100 nm.Although it takes a while to obtain a truly meaningful WC-Co cemented carbide, the first step has been taken to produce nanostructured powders. This commercially available powder produced by the spray conversion process consists of 20-500 nm WC grains dispersed in a metal binder phase that are one order of magnitude smaller than those produced by conventional carbonization processes.This paper explores the effects of nanoscale WC-Co Powder development status and spray conversion process of production capacity, and discusses the application of nanostructured powders are faced with all kinds of opportunities.