Porous silica ceramics with closed-cell structure prepared by inactive hollow spheres for heat insulation

CORC > 过程工程研究所 > 中国科学院过程工程研究所 > 多相复杂系统国家重点实验室

	Porous silica ceramics with closed-cell structure prepared by inactive hollow spheres for heat insulation
	Sun, Zhiqiang 1,2; Lu, Chen 1,2; Fan, Junmei1 ; Yuan, Fangli 1
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2016-03-25
卷号	662 期号:MAR 页码:157-164
关键词	Porous SiO2 ceramics Hollow structure Heat insulation Mechanical property
ISSN号	0925-8388
英文摘要	Highly porous silica ceramics (PSCs) with closed-cell structure are fabricated via sintering of randomly packed hollow SiO2 spheres (HSSs), and the influences of sintering parameters, additives and physical features of HSSs on the structure and performance of prepared PSCs are discussed. The results show that the hollow structure of SiO2 spheres is reserved during the sintering process due to its low-activated shells and the sintered necks are finely formed among the hollow spheres, which results in both high porosity and superior strength of final products and thus meets the needs of heat shielding materials. In addition, the optimized PSCs are synthesized with sintering temperature of 1200-1250 degrees C and additive of 4 wt.% H3BO3 combining 6 wt.% Al2O3, and the increase of closed porosity of PSCs brings in the enhanced thermal shielding effect while the strength degrades. Furthermore, the structure analysis reveals that decreased cristobalite phase in the PSCs reduces the glass viscosity and increases the packing density of HSSs, which also prefers to enhance the mechanical strength and thermal insulation. As a result, thermal conductivity of about 0.102-0.218 W/(m.k) and compressive strength of 3.2-14 MPa are obtained in our synthesized products. (C) 2015 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
研究领域[WOS]	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
关键词[WOS]	FLY-ASH ; THERMAL-CONDUCTIVITY ; FOAMS ; FABRICATION ; PHASE ; MICROSTRUCTURE ; CONTAMINATION ; PLASMA ; CLAY
收录类别	SCI
语种	英语
WOS记录号	WOS:000368336200021
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/20271]
专题	过程工程研究所_多相复杂系统国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Sun, Zhiqiang,Lu, Chen,Fan, Junmei,et al. Porous silica ceramics with closed-cell structure prepared by inactive hollow spheres for heat insulation[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2016,662(MAR):157-164.
APA	Sun, Zhiqiang,Lu, Chen,Fan, Junmei,&Yuan, Fangli.(2016).Porous silica ceramics with closed-cell structure prepared by inactive hollow spheres for heat insulation.JOURNAL OF ALLOYS AND COMPOUNDS,662(MAR),157-164.
MLA	Sun, Zhiqiang,et al."Porous silica ceramics with closed-cell structure prepared by inactive hollow spheres for heat insulation".JOURNAL OF ALLOYS AND COMPOUNDS 662.MAR(2016):157-164.