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Porous silica ceramics with closed-cell structure prepared by inactive hollow spheres for heat insulation
Sun, Zhiqiang1,2; Lu, Chen1,2; Fan, Junmei1; Yuan, Fangli1
2016-03-25
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume662Issue:MARPages:157-164
AbstractHighly 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.
KeywordPorous Sio2 Ceramics Hollow Structure Heat Insulation Mechanical Property
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.jallcom.2015.12.061
Indexed BySCI
Language英语
WOS KeywordFLY-ASH ; THERMAL-CONDUCTIVITY ; FOAMS ; FABRICATION ; PHASE ; MICROSTRUCTURE ; CONTAMINATION ; PLASMA ; CLAY
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China(51574211)
WOS IDWOS:000368336200021
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/20271
Collection多相复杂系统国家重点实验室
Affiliation1.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
Recommended Citation
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.
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