Preparation of porous SiC-Al2O3 ceramics via gelcasting utilising a shrinkable pore-forming agent and oxidised coarse-grained SiC

doi:10.1016/j.ceramint.2018.12.008

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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 1; Tian, Qingquan 2,3; Xiang, Yun 1; Chen, Lin 1; Song, Jieguang 1; Wang, Xianzhong 1; Guo, Xinshuang 1,3
通讯作者	Guo, Xinshuang(xsguo12b@alum.imr.ac.cn)
	2019-04-01
发表期刊	CERAMICS INTERNATIONAL
ISSN	0272-8842
卷号	45 期号:5 页码:5511-5517
摘要	By 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.
关键词	Porous SiC-Al2O3 ceramics Oxidised coarse-grained SiC Pore-forming agent Gelcasting Flexural strength
资助者	Key Technologies R&D Program of China ; Science and Technology Project of the Jiangxi Provincial Department of Education
DOI	10.1016/j.ceramint.2018.12.008
收录类别	SCI
语种	英语
资助项目	Key Technologies R&D Program of China[SQ2016ZYC01003836] ; Science and Technology Project of the Jiangxi Provincial Department of Education[GJJ171143]
WOS研究方向	Materials Science
WOS类目	Materials Science, Ceramics
WOS记录号	WOS:000459365500042
出版者	ELSEVIER SCI LTD
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/131919
专题	中国科学院金属研究所
通讯作者	Guo, Xinshuang
作者单位	1.Pingxiang Univ, Engn Technol Res Ctr Environm Protect Mat & Equip, Jiangxi Key Lab Ind Ceram, Pingxiang 337055, Peoples R China 2.Weinan Normal Univ, Sch Chem & Mat, Weinan 714099, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 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.