Preparation and mechanical properties of short carbon fibers reinforced alpha-Al2O3-based composites

doi:10.1016/j.ceramint.2018.07.163

	Preparation and mechanical properties of short carbon fibers reinforced alpha-Al2O3-based composites
	Jia, Jiangang 1; Liu, Diqiang 1,2; Gao, Changqi 1; Ji, Genshun 1; Guo, Tieming 1
刊名	CERAMICS INTERNATIONAL
	2018-11
卷号	44 期号:16 页码:19345-19351
关键词	Al2O3 Composite Sol-gel processes Strength Hot pressing
ISSN号	0272-8842
DOI	10.1016/j.ceramint.2018.07.163
英文摘要	Short carbon fiber (C-sf) reinforced alpha-Al2O3 (C-sf/alpha-Al2O3) composites were fabricated by a sol-gel dispersing method and a subsequent hot-pressing process. Effects of dispersing method, fiber contents and sintering aids on the mechanical performance of the composites were investigated. Based on sol-gel strategy, series of C-sf/alpha-Al2O3 composites were prepared and the Co. was evenly dispersed in the matrix of alpha-Al2O3 and preserved its pristine smooth surface, much superior to that of C-sf/alpha-Al2O3 prepared using ball milling method where Co was seriously damaged. The flexural strength of C-sf/alpha-Al2O3 composites first increase and reach the peak values, then decrease with the increase in fiber content. It reaches the maximum value of 336 MPa at 5 vol% of C-sf 106.0% higher than that of the alpha-Al2O3 ceramic without C-sf. The fracture toughness increases with C-sf content and deliver the highest value of 7.1 MPa/m(2) at 15 vol% of C-sf 117.4% higher than that of the alpha-Al2O3 ceramic without C-sf (3.5 MPa/m(2)). Fiber bridging, debonding and pulling out can effectively deflect the crack and release the stress intensity at the tip of the crack, resulting in the significant reinforcing and toughening effect in C-sf/alpha-Al2O3 composites. It should be mentioned that the tensile strength of the carbon fiber drastically decreases from about 2800 MPa to about 1200 MPa after heat-treated at 1500 degrees C for 1 h indicating that the potential of carbon fiber reinforcement is not fully exploited.
WOS研究方向	Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000447101500035
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/32363]
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China; 2.North Univ China, Sch Mat Sci & Engn, Taiyuan 030051, Shanxi, Peoples R China
推荐引用方式 GB/T 7714	Jia, Jiangang,Liu, Diqiang,Gao, Changqi,et al. Preparation and mechanical properties of short carbon fibers reinforced alpha-Al2O3-based composites[J]. CERAMICS INTERNATIONAL,2018,44(16):19345-19351.
APA	Jia, Jiangang,Liu, Diqiang,Gao, Changqi,Ji, Genshun,&Guo, Tieming.(2018).Preparation and mechanical properties of short carbon fibers reinforced alpha-Al2O3-based composites.CERAMICS INTERNATIONAL,44(16),19345-19351.
MLA	Jia, Jiangang,et al."Preparation and mechanical properties of short carbon fibers reinforced alpha-Al2O3-based composites".CERAMICS INTERNATIONAL 44.16(2018):19345-19351.