Effect of sintering techniques on the microstructure of liquid-phase-sintered SiC ceramics

详细信息    查看全文

• 作者：Hanqin Liang^a ; ^{hqliang@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiumin Yao^a ; ^{xmyao@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhengren Huang^a ; ¹ ; ^{zhrhuang@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Yuping Zeng^a ; Bizhe Su^a ; ^b ; ^c
• 关键词：SiC ; Liquid-phase sintering ; Hot pressing sintering ; Spark plasma sintering ; Microstructure
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：36
• 期：8
• 页码：1863-1871
• 全文大小：5629 K

文摘

Phase composition and microstructures of SiC ceramics with Al₂O₃ and Er₂O₃ as sintering additives were compared, which were prepared by pressureless liquid-phase sintering (PLPS), hot pressing sintering (HPS), and spark plasma sintering (SPS), respectively. Despite the different sintering temperatures and pressures, all samples were almost fully densified and exhibited fine-grained microstructure. Only SiC crystallized phase was detected in the SPS SiC because of the low sintering temperature and high cooling rate, while the ErAlO₃ phase accompanied with a designed Er₃Al₅O₁₂ phase was detected in the HPS SiC because of the absence of powder bed, which led to partial volatilization of Al₂O₃ powder at a higher sintering temperature. No obvious orientational growth of SiC grains was observed in all these ceramics, except a few 4H SiC grains along <1 0 0> axis in the SPS SiC. In addition, SiC–SiC grain boundary films differed from each other in these SiC ceramics.