Effects of cubic carbides and La additions on WC grain morphology, hardness and toughness of WC-Co alloys

来源期刊:中国有色金属学报(英文版)2012年第7期

论文作者:张立 陈述 程鑫 吴厚平 马鋆 熊湘君

文章页码:1680 - 1685

关键词:硬质合金;稀土;晶粒生长;板状晶WC;硬度;韧性

Key words:cemented carbide; rare earth; grain growth; platelet WC grain; hardness; toughness

摘    要:研究了立方碳化物Cr3C2、VC以及稀土La 添加剂对WC-Co合金中WC晶粒形貌以及合金硬度与韧性的影响。为了强化烧结过程中WC晶粒生长的驱动力,采用具有高烧结活性的纳米W和纳米C为原料。为了获得合金中WC晶粒的三维形貌,采用扫描电镜直接观察合金烧结体的自然表面。结果表明,合金添加剂对WC晶粒形貌及其粒度分布特征以及合金的硬度与韧性有较大影响。由于均质三角棱柱形板状WC晶粒的形成,WC-10Co-0.6Cr3C2-0.06La2O3合金具有极佳的硬度与韧性组合。讨论了合金中WC晶粒形貌的调控机制以及合金中WC晶粒形貌特征对合金性能的影响。

Abstract: Effects of Cr3C2, VC and La2O3 additions on the WC grain morphology, hardness and toughness of WC–10Co alloys were investigated. To intensify the grain growth driving force, nano W and nano C, instead of the conventionally used WC, were used as the starting materials. To obtain a three-dimensional WC grain morphology, the natural sinter skins of the alloys were observed directly by scanning electron microscopy. It is shown that the additions have a strong ability in regulating the WC grain morphological and grain size distribution characteristics and the combinations of hardness and toughness. Due to the formation of regular and homogeneous triangular platelet WC grains, WC-10Co-0.6Cr3C2-0.06La2O3 alloy shows an excellent combination of hardness and toughness. The morphological regulation mechanism, the relationship between the WC grain morphology and the properties were discussed.

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