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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
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume33Issue:2Pages:204-209
AbstractIn 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.
description.department[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
KeywordSilica-based Ceramic Cores Alumina Cristobalite Crystallization Properties
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Indexed BySCI
Language英语
WOS IDWOS:000396351600010
Citation statistics
Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78312
Collection中国科学院金属研究所
Corresponding AuthorLiang, JJ; Zhou, YZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
Recommended Citation
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.
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