(TiW)C-Ni硬质合金粉体合成的研究

以普通微米级的TiO2、W、Ni和活性碳为原料,采用机械激活合成法制备了(TiW)C-Ni硬质合金粉体。用XRD对粉体进行物相分析,用SEM分析激活及合成粉末的颗粒形貌,用气体容量法测定碳含量,用脉冲色谱法测试氧含量。结果表明:普通微米级的原料经过6h机械激活后,在1200℃下真空合成就能得到(TiW)C-Ni硬质合金粉体,但游离碳含量较高,最佳合成温度为1250℃;Ni在激活时加入不影响(TiW)C的合成;在同一温度下,游离碳含量随活性碳的增加而增加,化合碳含量随活性碳的增加先增加后减少。

Research on Synthesis of (TiW)C-Ni Cemented Carbide Powder

The （TiW）C-Ni cemented carbide powder was fabricated by means of mechanically activated synthesis （MAS）, using micrometer TiO2, W, Ni and activated carbon. The phase of powder was analyzed by XRD, the topography of activated and synthesized powder was analyzed by SEM, the oxygen content was tested by pulse chromatography method and the carbon content was tested by gas-volumetric method. The results showed that the （TiW）C-Ni powder of high free carbon content can be synthesized at 1200℃ in vacuum using ordinary micron powder as raw materials which have been activated for 6 hours, the optimal synthesis temperature is 1250℃. Ni added in the milling does not affect the synthesis of （TiW）C. At the same synthesis temperature, the free carbon content increases with inereasing amount of activated carbon, but the content of combined carbon firstly increases and then decreases with increasing amount of activated carbon.