硅及硅合金对反应烧结SiC耐磨材料性能与结构的影响

本文首先分析了熔渗材料硅及硅合金的润湿性、流动性、烧失率的变化.结果表明:熔渗材料硅在1 430℃,硅铁合金在1 470℃时润湿角小(分别为0°和6°)、流动性大(分别为267%和198%)、烧失率小(均小于15%).同时分析了反应烧结SiC耐磨材料性能,并采用扫描电子显微镜、X射线衍射仪、EDS分别对其显微结构、主晶...

Influence of silicon and silicon alloy on properties and structure of wear-resistant reaction-bonded silicon carbide

This research work studied the changes of wettability, fluidity, and burning loss rate of silicon and silicon alloy during infiltration sintering for siliscon carbide. The results showed that, silicon and fen＇o-silicon alloy has small wetting angle （0°and 6°, respectively） , high mobility （267% and 198% , respectively） , and low ignition loss（ below 15 % in average） , when the infiltration sintering temperature of silicon attained 1 430 ℃ , and that of ferro-silicon alloy was 1 470℃. Furlhermore, the researchers analysed the performances of the reaction-bonded silicon carbide by means of scanning electronic microscope, X-ray diffraction and EDS to characterize its microstructure, main phase and compositions. Research results showed that when the temperature for infihration sintering was 1 470 ~C , and this temperature being hold for 3 h, the reactionbonded silicon carbide can get high density （2.94 g/cm^3 ） , high hardness （3 054.45 Hv） , and high wear resistance （the wear is 0. 015 g） ; also, the compact structure with a few whiskers is beneficial to enhance the wear resistance and toughness of silicon carbide.