开展了气流粉碎B4C粉末(比表面积2.53m2/g)的掺碳烧结实验,研究了掺碳剂种类、掺碳量、烧结温度、比表面积等对B4C烧结密度的影响。结果表明,掺碳显著促进B4C的烧结;在炭黑、葡萄糖和酚醛树酯三种掺碳剂中,掺入酚醛树酯可以获得最高的烧结密度;并且最佳的掺碳量为3％～5％C,B4C+3％C(酚醛树酯)分别经2200和2250℃烧结后的密度为92.1％TD和94.4％TD,若采用振动球磨B4C粉末(8.30m2/g)进行掺碳烧结实验,则可使2200℃的烧结密度提高到95.6％TD。
Studies on carbon-doping activated sintering of B4C powders with a specific surface area of
2.53m2/g obtained by jet milling were carried out. The effects of carbon-doping agent, carbon-doping content, and specific surface area
on B4C sintering density were also studied. The results show that carbon-doping promotes greatly the densification of B4C. Among three
carbon-doping agents such as black carbon, glucose, and phenolic resin, the addition of phenolic resin makes B4C reach a highest sintering
density, with an optimum carbon-doping content of 3%～5%C. The relative density of B4C is 92.1%TD when sintered at 2200℃ for 1h, and 94.4%TD at 2250℃. If the vibratory milled B4C powders with a specific surface area of 8.30m2/g are used, the density of B4C sintered at 2200℃ increases to 95.6%TD.
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