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Preparation of porous SiC-Al2O3 ceramics via gelcasting utilising a shrinkable pore-forming agent and oxidised coarse-grained SiC
Wan, Li; Tian, Qingquan; Xiang, Yun; Chen, Lin; Song, Jieguang; Wang, Xianzhong; Guo, Xinshuang
2019-04-01
Source PublicationCERAMICS INTERNATIONAL
ISSN0272-8842
Volume45Issue:5Pages:5511-5517
AbstractBy utilising soaked millet as a shrinkable pore-forming agent, porous silicon carbide-alumina (SiC-Al2O3) ceramics were prepared via gelcasting. The fabrication of SiC-Al2O3 ceramics based on oxidised and unoxidised coarse-grained SiC was also studied. The water swelling, drying shrinkage, and low-temperature carbonisation of the millet were investigated. We found that the shrinkage of the soaked millet was greater than that of gel body during drying, which left large gaps that prevented shrinkage stresses from destroying the gel body. Low-temperature carbonisation of the millet should be performed slowly at 220-240 degrees C because its expansion rate increases to 45% at 250 degrees C, resulting in the cracking of samples. At a constant sintering temperature, the flexural strength of the SiC-Al2O3 ceramics prepared with SiC powders oxidised at 1000 degrees C was the highest, indicating that oxidised powders can successfully decrease the required sintering temperature and improve the flexural strength of composite ceramics. Based on our optimised process, porous SiC-Al2O3 ceramics were sintered at 1500 degrees C for 2 h. When their skeletons were fully developed, their pore sizes were in the range of 1.5-2 mm. Their porosity and flexural strength were 60.2-65.1% and 8.3-10.5 MPa, respectively.
KeywordPorous SiC-Al2O3 ceramics Oxidised coarse-grained SiC Pore-forming agent Gelcasting Flexural strength
Indexed BySCI
Language英语
WOS IDWOS:000459365500042
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81238
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Wan, Li,Tian, Qingquan,Xiang, Yun,et al. Preparation of porous SiC-Al2O3 ceramics via gelcasting utilising a shrinkable pore-forming agent and oxidised coarse-grained SiC[J]. CERAMICS INTERNATIONAL,2019,45(5):5511-5517.
APA Wan, Li.,Tian, Qingquan.,Xiang, Yun.,Chen, Lin.,Song, Jieguang.,...&Guo, Xinshuang.(2019).Preparation of porous SiC-Al2O3 ceramics via gelcasting utilising a shrinkable pore-forming agent and oxidised coarse-grained SiC.CERAMICS INTERNATIONAL,45(5),5511-5517.
MLA Wan, Li,et al."Preparation of porous SiC-Al2O3 ceramics via gelcasting utilising a shrinkable pore-forming agent and oxidised coarse-grained SiC".CERAMICS INTERNATIONAL 45.5(2019):5511-5517.
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