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A novel low-temperature strategy for synthesis of alumina ceramics with uniform and interconnected pores by silica coating
Sun, Zhiqiang1,2; Fan, Junmei1; Hu, Peng1; Ding, Fei1; Yang, Jun1; Yuan, Fangli1
2017-02-01
Source PublicationJOURNAL OF MATERIALS SCIENCE
ISSN0022-2461
Volume52Issue:3Pages:1603-1616
Abstract

A novel method, which involves the coating of the inactive Al2O3 microspheres with silica sol, is employed to decrease the sintering temperature for preparing porous alumina ceramics, and the influences of coating thickness and sintering conditions are discussed. The results show that the mullite necks among packed Al2O3 spheres are formed with the help of colloidal coatings at 1550 A degrees C, and the uniform and smooth pores are well reserved without visible shrinkage. In addition, the diffusion-controlled nucleation-growth process of mullite neck is set up based on EDS and XRD analysis, and the influence of inert surface of Al2O3 microspheres on mullitization kinetics is also revealed. Furthermore, the sintered necks grow and strengthen with the increase of the coating thickness because the available melt for thicker coating is more sufficient to meet capillary force. Besides, the ceramic strengthens with the increase of mullite content in necks, and the fracture mechanism transforms from glass crack to grain-boundary crack when the composition of necks changes from mullite/glass compounds to mullite. Finally, the synthesized porous ceramic shows excellent permeation flux, and its favorable pollution resistance is proved.

SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1007/s10853-016-0454-y
Indexed BySCI
Language英语
WOS KeywordDIPHASIC ALUMINOSILICATE GELS ; MULLITE FORMATION KINETICS ; SINGLE-PHASE GEL ; POROUS ALUMINA ; CRYSTALLIZATION KINETICS ; MULLITIZATION ; FABRICATION ; POWDERS ; SURFACE
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China (NSFC)(11535003 ; 51574211 ; 11575228)
WOS IDWOS:000389409000034
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21847
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,Fan, Junmei,Hu, Peng,et al. A novel low-temperature strategy for synthesis of alumina ceramics with uniform and interconnected pores by silica coating[J]. JOURNAL OF MATERIALS SCIENCE,2017,52(3):1603-1616.
APA Sun, Zhiqiang,Fan, Junmei,Hu, Peng,Ding, Fei,Yang, Jun,&Yuan, Fangli.(2017).A novel low-temperature strategy for synthesis of alumina ceramics with uniform and interconnected pores by silica coating.JOURNAL OF MATERIALS SCIENCE,52(3),1603-1616.
MLA Sun, Zhiqiang,et al."A novel low-temperature strategy for synthesis of alumina ceramics with uniform and interconnected pores by silica coating".JOURNAL OF MATERIALS SCIENCE 52.3(2017):1603-1616.
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