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Wang Z.,China North Industries Group Xian Huashan Tungsten Products Co. | Luo C.,China North Industries Group Xian Huashan Tungsten Products Co. | Xiao J.,China North Industries Group Xian Huashan Tungsten Products Co. | Zheng J.,China North Industries Group Xian Huashan Tungsten Products Co. | Peng Y.,China North Industries Group Xian Huashan Tungsten Products Co.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2014

93W-Co-Ni tungsten heavy alloys with high hardness were prepared by compositing, cold isostatic pressing and sintering with m(Co):m(Ni) ratio of 6:1. The influence of sintering temperature on density and microstructure was investigated, the change of HRC hardness in sintering process was studied, and the cause of hardness increasing was analysed. The results show that with increasing sintering temperature, the density increases, the density reaches the value of 17.73 g·cm-3 and the relative density reaches 99.16% by sintering at 1605°C. With increasing sintering temperature, the tungsten crystal grains grow and get smooth, at last the average grain size is about 20.91 μm, which accords with sintering mechanism of powder metallurgy. In the sintering process, the HRC hardness of alloy first reduces and then tends to stabilization in the range of 41~42. The smaller tungsten crystal grains and formation of intermetallic phase Co7W6 result in the increase of hardness. Source

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