Effects of Alumina on Cristobalite Crystallization and Properties of Silica-Based Ceramic Cores

IMR OpenIR

	Effects of Alumina on Cristobalite Crystallization and Properties of Silica-Based Ceramic Cores
	Liang, J. J.; Lin, Q. H.; Zhang, X.; Jin, T.; Zhou, Y. Z.; Sun, X. F.; Choi, B. G.; Kim, I. S.; Do, J. H.; Jo, C. Y.; Liang, JJ; Zhou, YZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
	2017-02-01
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	33 期号:2 页码:204-209
摘要	In this work, the influences of alumina addition on cristobalite crystallization and properties of injection molded silica-based ceramic cores were investigated. X-ray diffraction (XRD) was used to characterize phase transformations in the samples, and the XRD result indicated that the addition of alumina promoted crystallization of fused silica during sintering at 1180-1220 degrees C and thus increases the amount of cristobalite. The increased amount of cristobalite as well as alumina addition led to much more thermal dilation due to their higher coefficients of thermal expansion than that of fused silica. The flexural strengths at room temperature and 1500 degrees C were tested, and it was shown that alumina addition could not affect room temperature strength, but decreased the flexural strength at 1500 degrees C. In addition, deflection resistance during heating to high temperatures was investigated, and the result indicated that alumina addition speeded up high temperature softening of the samples. XRD and scanning electron microscopy equipped with energy dispersive spectrometry (SEM/EDS) analysis suggested that this softening behavior was related with viscous flow sintering which could be accelerated by the reaction of alumina and silica with a product of mullite. Copyright (C) 2017, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited.; In this work, the influences of alumina addition on cristobalite crystallization and properties of injection molded silica-based ceramic cores were investigated. X-ray diffraction (XRD) was used to characterize phase transformations in the samples, and the XRD result indicated that the addition of alumina promoted crystallization of fused silica during sintering at 1180-1220 degrees C and thus increases the amount of cristobalite. The increased amount of cristobalite as well as alumina addition led to much more thermal dilation due to their higher coefficients of thermal expansion than that of fused silica. The flexural strengths at room temperature and 1500 degrees C were tested, and it was shown that alumina addition could not affect room temperature strength, but decreased the flexural strength at 1500 degrees C. In addition, deflection resistance during heating to high temperatures was investigated, and the result indicated that alumina addition speeded up high temperature softening of the samples. XRD and scanning electron microscopy equipped with energy dispersive spectrometry (SEM/EDS) analysis suggested that this softening behavior was related with viscous flow sintering which could be accelerated by the reaction of alumina and silica with a product of mullite. Copyright (C) 2017, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited.
部门归属	[liang, j. j. ; lin, q. h. ; zhang, x. ; jin, t. ; zhou, y. z. ; sun, x. f.] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [choi, b. g. ; kim, i. s. ; do, j. h. ; jo, c. y.] korea inst mat sci, chang won 642831, south korea
关键词	Silica-based Ceramic Cores Alumina Cristobalite Crystallization Properties
学科领域	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/78312
专题	中国科学院金属研究所
通讯作者	Liang, JJ; Zhou, YZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
推荐引用方式 GB/T 7714	Liang, J. J.,Lin, Q. H.,Zhang, X.,et al. Effects of Alumina on Cristobalite Crystallization and Properties of Silica-Based Ceramic Cores[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2017,33(2):204-209.
APA	Liang, J. J..,Lin, Q. H..,Zhang, X..,Jin, T..,Zhou, Y. Z..,...&Zhou, YZ .(2017).Effects of Alumina on Cristobalite Crystallization and Properties of Silica-Based Ceramic Cores.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,33(2),204-209.
MLA	Liang, J. J.,et al."Effects of Alumina on Cristobalite Crystallization and Properties of Silica-Based Ceramic Cores".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 33.2(2017):204-209.