Mechanical properties and toughening mechanism of B4C-Al2O3 composite ceramics prepared by hot-press sintering

doi:10.1016/j.ceramint.2024.04.183

IMR OpenIR

	Mechanical properties and toughening mechanism of B4C-Al2O3 composite ceramics prepared by hot-press sintering
	Zhang, Jie 1,2; Zhang, Chunhua 1; Zhang, Song 1; Zhang, Wei 2
通讯作者	Zhang, Chunhua(zhangch5858@126.com) ; Zhang, Wei(cnzhangwei2008@126.com)
	2024-07-01
发表期刊	CERAMICS INTERNATIONAL
ISSN	0272-8842
卷号	50 期号:13 页码:24499-24507
摘要	Boron carbide-alumina (B4C-Al2O3) composite ceramics were fabricated using boron carbide (B4C) as the matrix and alumina (Al2O3) as the second phase by hot-press sintering at 1950 degrees C. The phase composition, microstructure, relative density, mechanical properties, and toughening mechanism of the composite ceramics were evaluated. When the content of Al2O3 is 30 wt%, the composite ceramics show the best comprehensive mechanical properties. The relative density, Vickers hardness, flexural strength, and fracture toughness of the obtained B4C-30 wt%Al2O3 composite ceramics reach up to 98.8 %, 24.7 GPa, 477 MPa, and 4.64 MPa m1/2, respectively. The introduction of Al2O3 as the second phase can significantly improve the fracture toughness of the B4C ceramics. Firstly, when cracks extend to the Al2O3 grains, the cleavage fracture of the Al2O3 grains resulting from its crystal structure causes the crack deflection along the cleavage plane. Secondly, due to the mismatch of the coefficient of thermal expansion between B4C and Al2O3, residual stress is generated at the grain boundary of the two phases and within the grains. The tensile stress at the grain boundary can cause some cracks to extend along the grain boundary, making cracks deflected, and the compressive stress within the B4C grains can inhibit crack extension. Thirdly, submicron-sized Al2O3 grains wrapped within the B4C grains form a subboundary structure, which can lead to crack extension along the subboundary. All of these factors consume the crack extension energy, which can contribute to increasing the fracture toughness of B4C-Al2O3 composite ceramics.
关键词	B 4 C-Al 2 O 3 composite ceramics Toughening mechanism Cleavage structure Residual stress Crack extension
资助者	Natural Science Foundation of Liaoning Province of China ; Starting Grants of Institute of Metal Research, Chinese Academy of Science ; Shenyang National Laboratory for Materials Science
DOI	10.1016/j.ceramint.2024.04.183
收录类别	SCI
语种	英语
资助项目	Natural Science Foundation of Liaoning Province of China[2022 -MS -013] ; Starting Grants of Institute of Metal Research, Chinese Academy of Science[E255L401] ; Shenyang National Laboratory for Materials Science[E21SL412]
WOS研究方向	Materials Science
WOS类目	Materials Science, Ceramics
WOS记录号	WOS:001242467300001
出版者	ELSEVIER SCI LTD
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/187092
专题	中国科学院金属研究所
通讯作者	Zhang, Chunhua; Zhang, Wei
作者单位	1.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Liaoning, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Jie,Zhang, Chunhua,Zhang, Song,et al. Mechanical properties and toughening mechanism of B4C-Al2O3 composite ceramics prepared by hot-press sintering[J]. CERAMICS INTERNATIONAL,2024,50(13):24499-24507.
APA	Zhang, Jie,Zhang, Chunhua,Zhang, Song,&Zhang, Wei.(2024).Mechanical properties and toughening mechanism of B4C-Al2O3 composite ceramics prepared by hot-press sintering.CERAMICS INTERNATIONAL,50(13),24499-24507.
MLA	Zhang, Jie,et al."Mechanical properties and toughening mechanism of B4C-Al2O3 composite ceramics prepared by hot-press sintering".CERAMICS INTERNATIONAL 50.13(2024):24499-24507.