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分别将两种工艺制备的超细碳化钨粉末制备成成分为WC+0.2%VC+0.6%Cr_3C_2+6.5%Co的混合料,测量两种混合料压坯在烧结过程中的收缩率的变化,并比较烧结后的四项性能和金相组织。研究结果表明,两种工艺制备的超细碳化钨粉末混合料表现出不同的烧结特性:1#碳化钨混合料收缩率为17.52%,收缩时间较短;2#碳化钨混合料的收缩率为18.25%,收缩时间较长。1#碳化钨混合料由于WC结晶完整、活性小,在湿磨过程中增氧较少,钴磁较高,烧结后合金的金相组织均匀,没有粗大晶粒;反之2#碳化钨混合料烧结后钴磁较低,合金的金相组织有粗大晶粒。
The ultrafine tungsten carbide powders prepared by the two processes were respectively prepared into a mixture of WC + 0.2% VC + 0.6% Cr 3 C 2 + 6.5% Co and the change of the shrinkage of the two mixtures during the sintering process was measured. And compare the four properties after sintering and microstructure. The results show that the ultrafine tungsten carbide powder mixture prepared by the two processes shows different sintering characteristics: the shrinkage rate of 1 # tungsten carbide mixture is 17.52% and the shrinkage time is short; the shrinkage rate of 2 # tungsten carbide mixture is 18.25%, contraction time longer. 1 # tungsten carbide mixture due to the complete crystallization of WC, activity, less oxygen in the wet grinding process, cobalt magnetic higher alloy after sintering microstructure, no coarse grains; the other hand, 2 # tungsten carbide mixture After sintering cobalt magnetic lower alloy microstructure with coarse grains.