材料期刊网

采用 X 射线衍射仪测定了 WC 粉的(100)和(300)衍射,并用 Fourier 变换对线形进行了分析.用扫描电镜对 WC 粉进行了形貌观察.结果表明,随着反应温度的提高,结晶趋于完善,钨粉的结构对 WC 的影响比碳化温度更为显著.而且结晶良好的粉末易于破碎.

X-ray diffraction profiles were obtained from eight process variants of WC powders in both the unmilled and heavily milled condition.From these X-ray profiles,coherent domain size and microstrain were determined,This study indi- cated that the degree of crystalline imperfections in the unmilled WC powder decreased with increasing reaction temperatures,i.e.the reduction and carburization temperatures,with reduction temperature being dominant.Additionally,the morphology of the WC particles was examined using SEM.The particle morphology evaluated by SEM and the degree of crystalline imperfection obtained by X-ray profiles analysis are in good agreement.The fracture characteristics of the as-recei- ved WC powder are closely related to the perfection of the powder.