一步还原法制备(W-Ti-Ta-Nb)C复合碳化物的研究

研究了一步还原法制备(W-Ti-Ta-Nb)C复合碳化物过程中,不同煅烧温度、煅烧时间和混料时间对产品固溶相比例、化合碳含量、游离碳含量的影响.通过正交试验优化得出最佳制备工艺条件为:煅烧温度2 100 ℃,煅烧时间50 min,混料时间3 h.所得复合碳化物粉末为100%的固溶相,其中化合碳的含量为10.67%,游离碳的含量为0.15%.

Preparation of the Compound Carbide (W-Ti-Ta-Nb)C by Direct Reduction

The compound carbide (W-Ti-Ta-Nb)C was prepared by direct reduction.The influences of different calcination temperature and duration and mixing time on the contents of solid solution phase,combined carbon and free carbon in the prepared (W-Ti-Ta-Nb)C were investigated.By orthogonal experiments,the optimal carbonization parameters are obtained as follows:calcination temperature 2 100 ℃,calcination duration 50 min and mixing duration 3 h.The final product is completely in the state of solid solution phase,where the content of combined carbon is 10.67% and free carbon is 0.15%.