高能球磨制备碳化钨过程中的结构转变

Structural Evolution of Tungsten Carbide Synthesized by Ball Milling

高能球磨W粉和石墨粉的混合物 ,并对球磨产物进行退火处理。球磨 4小时后在 1173K退火 ,就得到WC和W2 C ;球磨 2 8h后退火 ,得到了完全的h .c .p .WC。对球磨过程的分析发现W50 C50 混合粉末先形成固溶体 ,随后产生非晶化转变。在此实验条件下 ,球磨直接产物中没有检测到WC。另外 。

Tungsten carbide synthesized by ball milling elemental powders of W and graphite and foolowed by annealing at different temperatures has been studied. The specimen synthesized by ball milled for 4 hr and then annelaed at 1173K was composed of WC and W-2C. Single h.c.p. WC was obtained by ball milling for 28h and annealing. A b.c.c. WC solid solution was obtained at early milling stage and transformed into an amorphous phase upon further milling. Crystalline WC was not directly obtained by ball milling in these experimental conditions. The effect of annealing temperature and milling time on the phase formation of tungsten carbide has also been discussed in the present paper.