Mechanical and thermal properties of light weight boron-mullite Al5BO9

doi:10.1111/jace.17313

CORC > 金属研究所 > 中国科学院金属研究所

	Mechanical and thermal properties of light weight boron-mullite Al5BO9
	Ren, Yixiao 2; Dai, Fu-Zhi 2; Xiang, Huimin 2; Wang, Xiaohui 1; Sun, Luchao 1; Zhou, Yanchun 2
刊名	JOURNAL OF THE AMERICAN CERAMIC SOCIETY
	2020-07-07
卷号	103 期号:10 页码:13
关键词	Al5BO9 boron-mullite lightweight ceramics mechanical properties thermal properties
ISSN号	0002-7820
DOI	10.1111/jace.17313
通讯作者	Zhou, Yanchun(yczhou@alum.imr.ac.cn)
英文摘要	Al(5)BO(9)is a promising thermal sealing material for hypersonic vehicles due to its low density, theoretically predicted low shear modulus, and low thermal conductivity. However, experimental investigations on the mechanical and thermal properties of bulk Al(5)BO(9)have not been carried out. Herein, we report the mechanical and thermal properties of bulk Al(5)BO(9)prepared by spark plasma sintering of solid-state reaction synthesized Al(5)BO(9)powders. The bulk (B), shear (G), and Young's (E) moduli are 148 GPa, 85 GPa, and 214 GPa, respectively, which are close to the theoretical values. The Pugh's ratio G/B is 0.574, indicating its intrinsic damage tolerance, which is also revealed by Hertzian contact test. The Vickers hardness (H-v) is 10.8 GPa, being lower than mullite. The flexural strength, compressive strength, and fracture toughness are, respectively, 277 +/- 35 MPa, 814 +/- 75 MPa, and 2.4 +/- 0.3 MPa center dot m(1/2), which are close to those of mullite. Al(5)BO(9)has anisotropic coefficient of thermal expansion (CTE) in three crystallographic directions, ie alpha(a) = (4.40 +/- 0.21) x 10(-6)K(-1),alpha(b) = (7.11 +/- 0.18) x 10(-6)K(-1),alpha(c) = (6.70 +/- 0.29) x 10(-6)K(-1)from Debye temperature to 1473 K, which are underpinned by its structural feature, ie lower alpha(a)is resulted from the edge-shared AlO(6)octahedron chains along the [100] direction. The average CTE is (6.05 +/- 0.06) x 10(-6) K-1. The thermal conductivity declines with temperature as kappa = 1336.39/T + 1.97, consisting with predicted trend from Slack's model. The low thermal conductivity and low density guarantee Al(5)BO(9)a promising candidate as ceramic wafer in the seal structure for hypersonic vehicles.
资助项目	National Natural Science Foundation of China[51672064] ; National Natural Science Foundation of China[51972089]
WOS研究方向	Materials Science
语种	英语
出版者	WILEY
WOS记录号	WOS:000545968200001
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/139778]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhou, Yanchun
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang, Peoples R China 2.Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, 1 South Dahongmen Rd, Beijing 100076, Peoples R China
推荐引用方式 GB/T 7714	Ren, Yixiao,Dai, Fu-Zhi,Xiang, Huimin,et al. Mechanical and thermal properties of light weight boron-mullite Al5BO9[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2020,103(10):13.
APA	Ren, Yixiao,Dai, Fu-Zhi,Xiang, Huimin,Wang, Xiaohui,Sun, Luchao,&Zhou, Yanchun.(2020).Mechanical and thermal properties of light weight boron-mullite Al5BO9.JOURNAL OF THE AMERICAN CERAMIC SOCIETY,103(10),13.
MLA	Ren, Yixiao,et al."Mechanical and thermal properties of light weight boron-mullite Al5BO9".JOURNAL OF THE AMERICAN CERAMIC SOCIETY 103.10(2020):13.