电场作用下压坯密度对W-C-Co体系燃烧合成的影响

Effect of Compact Density on Combustion Synthesis of W-C-Co System Based on Electric Field

采用Gleeble-3500D热模拟机，在电场和大热流密度作用下，研究压坯密度对88（W＋C）-12Co（质量分数）粉末压坯燃烧合成的影响。结果表明：当压坯相对密度为71％-75％，体系的点火温度为727～753℃；随压坯密度提高，体系点火温度降低，点火延迟时间有所缩短，但变化幅度不大。同时，合成产物的XRD和SEM结果表明：压坯密度对燃烧合成产物的相组成影响不大，均由WC和W2C组成；但随压坯密度增大，产物中碳化钨颗粒逐渐减小。

Using Gleeble-3500D thermal simulation equipment, the effect of compact density on combustion synthesis of 88wt%（W＋C）-12wt%Co mixture powders based on the electric field was studied. The results show that the compacts with relative density ranging from 71%-75% can be ignited at the temperature ranging from 727℃ to 753℃. The ignition temperature becomes lower and the ignition delay time becomes shorter with the increase of compact density, but the change extent to the ignition delay time is a little. At the same time, the results of XRD and SEM for synthesized products show that the compact density has a little influence on products, all of them consist of WC and W2C, but the size of products particle of WC becomes smaller with the increase of compact density.