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通过对TZM钼合金中与生成碳化钛相关反应的吉布斯自由能变化的计算,与钼的有关相图比较,分析在粉末冶金TZM钼合金烧结过程中碳化物的形成方式和机制。结果表明:不同于熔炼TZM,在真空烧结过程中TiC是以Ti+C=TiC的方式在粉末颗粒相界面、晶界亚晶界等处原位生成,少量TiC在烧结后的降温过程中在晶内析出;Zr元素部分以单质存在,部分在高温下与Mo形成固溶体,在降温过程中析出Laves相Mo2Zr;在Zr颗粒边缘易于形成ZrC,晶内则不易形成ZrC。
Through the calculation of the Gibbs free energy change of TZM molybdenum alloy in relation to the formation of titanium carbide, the formation phase and mechanism of carbides during the sintering process of powder metallurgy TZM molybdenum alloy were compared with that of molybdenum. The results show that TiC is different from the melting TZM in the vacuum sintering process TiC = TiC way in the powder grain phase interface, grain boundary formation in situ, a small amount of TiC in the cooling process after sintering in the The Zr element partially exists as a single element and partly forms a solid solution with Mo at high temperature, which precipitates Laves phase Mo2Zr during the cooling process. ZrC is easily formed at the edge of the Zr particles and ZrC is not easily formed in the crystal.