Effect of specimen thickness on the creep deformation of a silica-based ceramic core material

doi:10.1016/j.jallcom.2018.05.253

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	Effect of specimen thickness on the creep deformation of a silica-based ceramic core material
	Li, KW ; Jiang, WG ; Wang, SG ; Xiao, JH ; Lou, LH
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-09-30
卷号	763 页码:781-790
关键词	Ceramic core Creep Specimen thickness Cristobalite Porosity
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2018.05.253
英文摘要	In this study, the effect of the thickness of a silica-based ceramic core on its creep deformation, either in air or under vacuum, was studied. Specimens with different thicknesses after sintering were heated to 1550 degrees C and by maintaining the same temperature for 40, 70 or 100 min. Scanning electronic microscopy (SEM) was employed to observe the surface microstructures and fracture morphologies of the samples. X-ray diffraction (XRD) was used to characterize the phases that formed after creep deformation. The 3D distribution of micropores and the porosities of the specimens at different states were tested by X-ray computerized tomography (XCT). The experimental results show that the effect of the thickness of the specimen on the creep deformation was notably different under different atmospheres. The creep deformation of samples with the same thicknesses under vacuum atmosphere was clearly higher than the deformation in air. In air, the creep resistance was slightly affected by the thickness of the specimen. However, the creep deformation was significantly affected by the thickness of the specimen under vacuum. The creep resistance of the 4-mm-thick specimen is noticeably higher than that of the 0.5-mm-thick specimens. The creep rate of the 0.5-mm-thick specimen is linear with the porosity of the surface layer and higher compared to the 4-mm-thick specimen, which exhibited non-linear behaviour. Reactive micropores were formed on the surface layer of these specimens under vacuum. The volume fraction of the micropores increased with increasing creep time, which resulted in the different characterization of creep for specimens with different thicknesses under vacuum. (C) 2018 Published by Elsevier B.V.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000442484300090
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79952]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Li, KW,Jiang, WG,Wang, SG,et al. Effect of specimen thickness on the creep deformation of a silica-based ceramic core material[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,763:781-790.
APA	Li, KW,Jiang, WG,Wang, SG,Xiao, JH,&Lou, LH.(2018).Effect of specimen thickness on the creep deformation of a silica-based ceramic core material.JOURNAL OF ALLOYS AND COMPOUNDS,763,781-790.
MLA	Li, KW,et al."Effect of specimen thickness on the creep deformation of a silica-based ceramic core material".JOURNAL OF ALLOYS AND COMPOUNDS 763(2018):781-790.