Al2O3 coating for densification of SiC ceramics and sintering kinetics

doi:10.1016/j.surfcoat.2019.06.040

	Al2O3 coating for densification of SiC ceramics and sintering kinetics
	Luo, Yang 2,3,4; Wu, Yinghong 1,2,4; Xiao, Dezhi 3; Tang, Kaiwei 3; Huang, Chao 3; Fu, Ricky K. Y.3; Zheng, Shili 4; Chu, Paul K.3
刊名	SURFACE & COATINGS TECHNOLOGY
	2019-09-25
卷号	374 页码:603-609
关键词	SiC Ceramics Al2O3 Coatings Mechanical properties Sintering kinetics
ISSN号	0257-8972
DOI	10.1016/j.surfcoat.2019.06.040
英文摘要	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.
资助项目	City 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关键词	MECHANICAL-PROPERTIES ; SILICON-CARBIDE ; LIQUID-PHASE ; MICROSTRUCTURE ; NANOPARTICLES ; COMPOSITES ; ADDITIVES ; STRENGTH ; BEHAVIOR ; ALUMINA
WOS研究方向	Materials Science ; Physics
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000486360000060
资助机构	City University of Hong Kong Strategic Research Grant (SRG) ; Hong Kong Research Grants Council (RGC) General Research Funds (GRF) ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/30906]
专题	中国科学院过程工程研究所
通讯作者	Zheng, Shili; Chu, Paul K.
作者单位	1.City Univ Hong Kong, Sch Energy & Environm, Kowloon, Hong Kong, Peoples R China 2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China 3.City Univ Hong Kong, Dept Phys, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China 4.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydrometallurg Cleaner Prod Technol, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
推荐引用方式 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.