碳化物/钢基复合材料原料球磨效果及其电子理论分析

Ball milling effects of raw materials for carbide/steel matrix composite and electron theory analysis

对碳化钛、碳化钨/钢基复合材料原料粉体进行了球磨试验和相应粒度变化等的SEM等分析。结果表明:作为硬质相的WC、TiC球磨细化效果最佳;作为基体材料的体心立方金属球磨效果较好(且Mo>Cr>Fe),面心立方镍的球磨效果较差,石墨仅初期球磨效果好。运用固体与分子经验电子理论,结合原料单质的键性质和晶体结构特征分析了实验结果,并依据计算得到的价电子结构参数(nA值与η值及键络均衡性)剖析了以上复合材料原料单质球磨行为的差异。

The effects of ball miffing on particle sizes of raw materials of carbide/steel matrix composite,were examined and analysed by means of SEM. The results show that the strong ball milling effect is observed for WC and TiC powders as hard phases in composite. However,for the bec metal powders of Mo,Cr and Fe as matrix materials of composite,less effect of ball milling is found,and the milling efficiency of the fcc metal Ni powder is lowest. Graphite is easily milled initially and then the milling effect decreases with continuous ball milling. Combined with the bond nature and crystal structure characteristics of raw materials, the above results are analysed and discussed based on the calculating of valence electron structure parameters（main bond strength nA , mechanical property parameter η and bond network equilibrium）using the empirical electron theory（EET） of solid and molecules.