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Effects of cobalt additions on WC grain growth

机译：钴添加对WC晶粒长大的影响

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摘要

Inhomogeneity in the particle size of the tungsten carbide raw material can result in abnormal WC grain growth in WC-Co cemented carbides. For the preparation of ultrafine tungsten carbide powders and ultrafine cemented carbides, abnormal WC grain growth is the most troublesome issue. This paper deals with the effects of cobalt additions on WC grain growth during the carburisation process of nano- and coarse tungsten powders and the sintering process of ultrafine tungsten carbide powders. For the preparation of tungsten carbide powders, it was shown that through the incorporation of 0.035 wt-%Co into W+C mixtures, a dramatic change in WC grain morphology took place for coarse tungsten raw material, while for nanotungsten raw material, a pronounced WC grain growth took place. Plate-like truncated trigonal and hexagonal WC grains were formed during the carburisation process of coarse tungsten raw material containing 0.035 wt-%Co. For the sintering of ultrafine tungsten carbide powders containing 0.3 wt-%Co, an anisotropic and abnormal WC grain growth took place. The mechanisms for WC grain growth were discussed, and suggestions were made for the quality improvement of nano-and ultrafine tungsten carbide powders and ultrafine cemented carbides.
机译：碳化钨原料的粒径不均匀会导致WC-Co硬质合金中WC晶粒异常生长。对于制备超细碳化钨粉末和超细硬质合金，WC晶粒异常生长是最麻烦的问题。本文研究了钴的添加对纳米和粗钨粉渗碳过程以及超细碳化钨粉烧结过程中WC晶粒长大的影响。对于制备碳化钨粉末，结果表明，通过将0.035 wt %%的Co掺入W + C混合物中，粗钨原料的WC晶粒形态发生了显着变化，而纳米钨原料的WC晶粒形态发生了显着变化。 WC晶粒长大。在含0.035 wt％Co的粗钨原料的渗碳过程中，形成了板状的截断的三角形和六角形的WC晶粒。为了烧结含0.3wt％Co的超细碳化钨粉末，发生了各向异性且异常的WC晶粒生长。讨论了碳化钨晶粒长大的机理，并为改善纳米碳化钨粉和超细碳化钨粉以及超细硬质合金的质量提出了建议。

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