Fabrication, mechanical properties and thermal shock resistance of a dense SiC NWs/α-Si3N4 composite coating for protecting porous Si3N4 ceramics

doi:10.1016/j.ceramint.2019.08.020

	Fabrication, mechanical properties and thermal shock resistance of a dense SiC NWs/α-Si3N4 composite coating for protecting porous Si3N4 ceramics
	Wang, Binglei 1; Shangguan, Duandan 1; Qiao, Ruiqing 1; Zhang, Fan 1; Bai, Yu 1; Wang, Zhanjie 1; Wang, Chao 1; Lu, Xuefeng 2
刊名	Ceramics International
	2019-12-01
卷号	45 期号:17 页码:23241-23247
关键词	Ability testing Composite coatings Cracks Fabrication Mechanical properties Mechanisms Shock testing Silicon Silicon carbide Sintering Thermal shock Water absorption Critical crack size Extreme conditions Interfacial bonding Liquid infiltration method Porous Si3N4 ceramic Thermal shock resistance Toughening effects Toughening mechanisms
ISSN号	02728842
DOI	10.1016/j.ceramint.2019.08.020
英文摘要	To prevent porous Si3N4 ceramics from absorbing moisture in practical application, a dense SiC NWs/α-Si3N4 composite coating was fabricated using the two-step technology involving slurry and liquid infiltration method. The results revealed that the SiC NWs not only can promote densification sintering of the coating but also can reduce thickness of the coating effectively due to the block effect of the SiC NWs. Furthermore, the SiC NWs in the coating had a good interfacial bonding with α-Si3N4 matrix, meanwhile the toughening effects of the SiC NWs involving crack deflection, crack branching, SiC NWs bridging and pullout, also presented during mechanical damage. The strengthening and toughening mechanisms of the SiC NWs not only enhanced mechanical properties of the coating but also raised significantly critical crack size (L), thereby which made the coating have a good ability for thermal shock resistance. After thermal shock at ΔT = 1000 °C for 15 times, water absorption of the coated porous Si3N4 ceramics increased only to 7.21% from 4.54%, and its residual strength ratio was up to 83.4%. More importantly, the coating exhibited an ability for crack healing during thermal shock testing. All those above results indicated that as-prepared SiC NWs/α-Si3N4 composite coating can meet the applied requirements in long-term extreme conditions. © 2019 Elsevier Ltd and Techna Group S.r.l.
WOS研究方向	Materials Science
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000493217800102
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114270]
专题	材料科学与工程学院
作者单位	1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang; 110870, China; 2.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Wang, Binglei,Shangguan, Duandan,Qiao, Ruiqing,et al. Fabrication, mechanical properties and thermal shock resistance of a dense SiC NWs/α-Si3N4 composite coating for protecting porous Si3N4 ceramics[J]. Ceramics International,2019,45(17):23241-23247.
APA	Wang, Binglei.,Shangguan, Duandan.,Qiao, Ruiqing.,Zhang, Fan.,Bai, Yu.,...&Lu, Xuefeng.(2019).Fabrication, mechanical properties and thermal shock resistance of a dense SiC NWs/α-Si3N4 composite coating for protecting porous Si3N4 ceramics.Ceramics International,45(17),23241-23247.
MLA	Wang, Binglei,et al."Fabrication, mechanical properties and thermal shock resistance of a dense SiC NWs/α-Si3N4 composite coating for protecting porous Si3N4 ceramics".Ceramics International 45.17(2019):23241-23247.