以Isobam作为胶凝剂,聚甲基丙烯酸甲酯(PMMA)作为泡沫稳定剂和造孔剂,结合固相烧结制备出具有多级孔结构的碳化硅陶瓷,并研究了PMMA添加量、球磨机转速以及烧结温度对多孔陶瓷结构及性能的影响.结果表明:当球磨机转速为220 r/min、烧结温度为2100℃时,随着PMMA添加量由5wt%增加到20wt%,发泡过程受到抑制,但是泡沫的稳定性增强,所得多孔陶瓷的气孔率在51.5%~72.8%之间,压缩强度介于7.9~48.2 MPa之间;当PMMA加入量为20wt%时,随着球磨机转速由220 r/min增大到280 r/min,加剧了浆料的发泡过程,2100℃烧结所得多孔陶瓷的气孔率逐步增大,气孔孔径变大;当球磨机转速为220 r/min,PMMA加入量为20wt%时,随着烧结温度的升高,气孔率逐渐降低,力学性能有所提高.
Porous SiC ceramics with multiple pore structures were fabricatedvia gelcasting and solid state sinter-ing. A novel gelling agent of Isobam was applied and PMMA was used as both foam stabilizer and pore forming agent. The mechanical properties of porous SiC ceramics were investigated as functions of PMMA content, rotating speed of ball mill, and sintering temperature. With PMMA content increasing from 5wt% to 20wt%, the foaming effect was inhibited while the stability of bubbles increased. When the rotating speed was 220 r/min, the open po-rosities of the as-prepared SiC ceramics sintered at 2100℃ variedfrom 51.5% to 72.8%, and compressive strength varied from 7.9 to 48.2 MPa. With the rotating speed increasing from 220 to 280 r/min, the foaming effect was ag-gravated and the porosities of SiC ceramics sintered at 2100℃ increased.While the sintering temperature increasing from 2050 to 2150℃,the SiC ceramics prepared with PMMA content of 20wt% at rotating speed of 220 r/min de-creased in the open porosities while increased in compressive strength.
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