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Al2O3 coating for densification of SiC ceramics and sintering kinetics
Luo, Yang1,2,3; Wu, Yinghong2,3,4; Xiao, Dezhi1; Tang, Kaiwei1; Huang, Chao1; Fu, Ricky K. Y.1; Zheng, Shili2; Chu, Paul K.1
2019-09-25
Source PublicationSURFACE & COATINGS TECHNOLOGY
ISSN0257-8972
Volume374Pages:603-609
Abstract

Incorporation of additives into silicon carbide (SiC) ceramics in low temperature, atmospheric pressure sintering is challenging because uniform mixing of additives and raw SiC powders is quite difficult. Herein, an impregnation coating process in which a precise amount of Al2O3 is introduced to raw SiC granules on the nanoscale is described and high-performance SiC ceramics can be processed by atmospheric pressure sintering. The uniform coating promotes densification of SiC via enhanced liquid mass transfer and inhibits grain growth and recombination during sintering. The effects of the doping content on the ceramic structure and mechanical properties are studied. Coating a single layer of Al2O3 nano-particles on SiC particles yield the best interfacial activity, sintering density, and mechanical properties. The SiC sample with 7.5 wt% Al2O3 possesses the best properties such as a relative density of 97.98%, flexural strength of 434.40 MPa, fracture toughness of 5.23 MPa.m(1/2), and Vickers hardness of 28.21 GPa. The sintering kinetics analyzed by the isothermal sintering method fits the Singh model with an apparent activation energy of 574.64 kJ/mol. The sintering rate is governed by both the interface reaction and diffusion and the model and experimental results provide insights with respect to materials design and commercial batch production.

KeywordSic Ceramics Al2o3 Coatings Mechanical Properties Sintering Kinetics
DOI10.1016/j.surfcoat.2019.06.040
Language英语
WOS KeywordMechanical-properties ; Silicon-carbide ; Liquid-phase ; Microstructure ; Nanoparticles ; Composites ; Additives ; Strength ; Behavior ; Alumina
Funding ProjectCity University of Hong Kong Strategic Research Grant (SRG)[7005105] ; Hong Kong Research Grants Council (RGC) General Research Funds (GRF)[CityU 11205617] ; National Natural Science Foundation of China[51774261]
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Coatings & Films ; Physics, Applied
Funding OrganizationCity University of Hong Kong Strategic Research Grant (SRG) ; Hong Kong Research Grants Council (RGC) General Research Funds (GRF) ; National Natural Science Foundation of China
WOS IDWOS:000486360000060
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/30907
Collection中国科学院过程工程研究所
Corresponding AuthorZheng, Shili; Chu, Paul K.
Affiliation1.City Univ Hong Kong, Dept Phys, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydrometallurg Cleaner Prod Technol, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
4.City Univ Hong Kong, Sch Energy & Environm, Kowloon, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Luo, Yang,Wu, Yinghong,Xiao, Dezhi,et al. Al2O3 coating for densification of SiC ceramics and sintering kinetics[J]. SURFACE & COATINGS TECHNOLOGY,2019,374:603-609.
APA Luo, Yang.,Wu, Yinghong.,Xiao, Dezhi.,Tang, Kaiwei.,Huang, Chao.,...&Chu, Paul K..(2019).Al2O3 coating for densification of SiC ceramics and sintering kinetics.SURFACE & COATINGS TECHNOLOGY,374,603-609.
MLA Luo, Yang,et al."Al2O3 coating for densification of SiC ceramics and sintering kinetics".SURFACE & COATINGS TECHNOLOGY 374(2019):603-609.
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