热压烧结制备高致密度B_4C陶瓷及其致密化
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摘要
以B4C粉末为原料,以酚醛树脂热解碳为烧结助剂,采用真空热压烧结工艺制备出高致密度的B4C陶瓷材料,探讨了酚醛树脂含量和烧结温度对材料致密化的影响,对比分析了纯B4C和掺碳B4C的热压烧结致密化过程。研究显示,烧结温度的升高有利于材料的致密化,酚醛树脂的添加则显著活化了B4C的烧结。实验条件下酚醛树脂的最优添加量为3%(质量分数),烧结过程中热解碳固溶于B4C晶格,显著加速了其在1600℃至1800℃区间的致密化速率。
B4 C ceramics were fabricated by hot-press sintering with phenolic resin as the precursor of pyrolysis carbon agent.The influences of additive and sintering temperature on the density of B4 C ceramics as well as their hot-press sintering densification process were studied.The results showed that the increase of sintering temperature was beneficial to the densification of B4 C ceramics, while phenolic resin was significantly reduce the sintering activation energy of B4 C.When the phenolic resin content was 3%,the hot-press sintering densification rate of B4 C ceramics bewteen 1600℃ and 1800℃increased due to the solid soluting of pyrolysis carbon into B4 C grains.
B4 C ceramics were fabricated by hot-press sintering with phenolic resin as the precursor of pyrolysis carbon agent.The influences of additive and sintering temperature on the density of B4 C ceramics as well as their hot-press sintering densification process were studied.The results showed that the increase of sintering temperature was beneficial to the densification of B4 C ceramics, while phenolic resin was significantly reduce the sintering activation energy of B4 C.When the phenolic resin content was 3%,the hot-press sintering densification rate of B4 C ceramics bewteen 1600℃ and 1800℃increased due to the solid soluting of pyrolysis carbon into B4 C grains.
引文
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[7]Kislyi P.S.Europasches Symposium fur Pulvermetallurgie[D].Grenoble,1975.
[8]王零森,尹邦跃,方寅初.纯B4C和掺碳B4C的烧结机制[J].硅酸盐学报,2001,29(1):68-71.
[2]祝宝军,肖汉宁,陶颖,等.碳化硼陶瓷活化烧结技术进展[J].硬质合金,2004,21(2):116-120.
[3]Schwetz K A,Grellner W.The influence of carbon on the microstructure and mechanical properties of sintered boron carbide[J].Inst Phys Conf Ser,1986,75:413.
[4]Shigeyuki Somiya.Advanced Technical Ceramics[M].Tokyo:Academic Press,Inc.,1988.
[5]Angers R,Beauvy M.Hot Pressing of Boron Carbide[J].Ceram.Int.1984,10(2):49-55.
[6]Bougoinm,Thevenotf.Pressure-less sintering of boron carbide with an addition of poly carbosilance[J].Journal of Materials Science,1990,22:109-114.
[7]Kislyi P.S.Europasches Symposium fur Pulvermetallurgie[D].Grenoble,1975.
[8]王零森,尹邦跃,方寅初.纯B4C和掺碳B4C的烧结机制[J].硅酸盐学报,2001,29(1):68-71.