Enhanced mechanical properties of W-doped Nb4AlC3 ceramics

doi:10.1016/j.ceramint.2018.06.158

	Enhanced mechanical properties of W-doped Nb4AlC3 ceramics
	Cai, Ping 1,2; He, Qiming 2,3; Wu, Xishi 1,2; Liu, Xuejian 1; Liu, Yan 1; Yin, Jie 1; Huang, Yihua 1; Huang, Zhengren 1
刊名	Ceramics International
	2018
卷号	44 期号:16 页码:19135-19142
ISSN号	02728842
DOI	10.1016/j.ceramint.2018.06.158
英文摘要	The W-doped Nb4AlC3 ceramics [(Nb1-xWx)4AlC3, x = 0–0.0375] were successfully fabricated by in-situ reactive hot-press-aided method using elemental niobium, aluminum, graphite and tungsten powders. The XRD results suggest that the matrix phase (Nb1-xWx)4AlC3 and the second phase (Nb1-xWx)C were simultaneously formed when W was added. The SEM images show that (Nb1-xWx)C is dispersed in the W-doped Nb4AlC3 ceramics matrix. The mechanical properties of Nb4AlC3 were greatly enhanced by W doping. Typically, the (Nb0.975W0.025)4AlC3 exhibits the highest flexural strength (483 ± 21 MPa), fracture toughness (8.5 ± 0.3 MPa⋅m1/2) and Young′s modulus (382 ± 18 GPa) at room temperature (RT), which are increased by 59%, 15% and 30%, respectively, compared with the present Nb4AlC3. The Vickers hardness of (Nb0.9625W0.0375)4AlC3 (4.8 ± 0.2 GPa) is 92% higher than that of Nb4AlC3. The (Nb0.975W0.025)4AlC3 also retains a high flexural strength of 344 ± 4 MPa at 1400 °C (71% of RT value), which is much higher than the RT flexural strength (303 ± 22 MPa) of the present Nb4AlC3. The strengthening effect is attributed to the solid solution of W and the incorporation of the second phase (Nb1-xWx)C. The excellent mechanical properties endow the W-doped Nb4AlC3 ceramics as promising high-temperature structural materials. © 2018
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/25196]
专题	中国科学院上海硅酸盐研究所
作者单位	1.State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 201800, China; 2.University of Chinese Academy of Sciences, Beijing; 100049, China; 3.CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 201800, China
推荐引用方式 GB/T 7714	Cai, Ping,He, Qiming,Wu, Xishi,et al. Enhanced mechanical properties of W-doped Nb4AlC3 ceramics[J]. Ceramics International,2018,44(16):19135-19142.
APA	Cai, Ping.,He, Qiming.,Wu, Xishi.,Liu, Xuejian.,Liu, Yan.,...&Huang, Zhengren.(2018).Enhanced mechanical properties of W-doped Nb4AlC3 ceramics.Ceramics International,44(16),19135-19142.
MLA	Cai, Ping,et al."Enhanced mechanical properties of W-doped Nb4AlC3 ceramics".Ceramics International 44.16(2018):19135-19142.