【摘要】 采用流化床对撞式气流粉碎 (QLM 80K)对工业用SiC粉体进行超微化处理 ,考察了工作压力对超微化的影响 ;并采用激光粒度分布仪、扫描电镜、XRD对超微化前后的SiC粉体进行粒度、形貌及结构的研究。研究结果表明 :工作压力愈高 ,SiC粉体的超微化效果愈明显。工作压力为 0 6MPa时 ,超微化前后SiC粉体的平均粒径由 3 0 1μm降至 0 75 μm ,粒径小于 2 5 μm的比例由 82 86 %升至 99 85 % ,粒径主要分布由 0 4～ 1 5 μm和 8～2 3μm的双峰分布变为 0 4～ 1 2 μm的单峰分布 ,分布宽度从 2 5 12 5降到 0 833;颗粒主要以片状、小块状存在 ,分布均匀 ,超微化前存在的大块状颗粒基本消失 ,团聚现象明显减少 ;超微化前后SiC粉体的晶型都属于α SiC(6H) ,超微化后各主要衍射峰的强度减弱、半高宽有所宽化更多还原

【Abstract】 The superfine-treatment of the industrial SiC powder was carried out by fluidized bed opposed jet mill(QLM-80K), and the effects of working pressure on superfine-treatment were studied. The particle size distribution, microscopic morphology and structure of the SiC powder after and before superfine-treatment were studied by laser grain size analyzer, SEM and XRD. The results show that the effect of work pressure on super-treatment was apparent. When work pressure is 0^6MPa, compared with before super-treatment, after super-treatment the average size of the powder decreases from 3^01μm to 0^75μm, the percent of the particle size<2^5μm ascends from 82^86% to 99^85%, and the size distribution of two peaks(0^4～1^5μm and 8～23μm) becomes one peak(0^4～1^2μm), the size distribution width decreases from 25^125 to 0^833; the SiC particle shapes are laminar and nubbly, the blocky particle disappears basically, and the reunite decreases in evidence; the crystalline of SiC is α-SiC, the intensity of diffraction peak decreases and FWHM increases with the decrease of particle size.更多还原