Microstructure and macro properties of Al2O3ceramics prepared by laser engineered net shaping

doi:10.1016/j.ceramint.2018.05.036

	Microstructure and macro properties of Al2O3ceramics prepared by laser engineered net shaping
	Niu, Fangyong 1; Wu, Dongjiang 1; Lu, Fan 1; Liu, Gang 2; Ma, Guangyi 1; Jia, Zhenyuan 1
刊名	Ceramics International
	2018
卷号	44 期号:12 页码:14303-14310
ISSN号	02728842
DOI	10.1016/j.ceramint.2018.05.036
英文摘要	Laser engineered net shaping (LENS) technology, due to its ability in melting and solidification of neat ceramic materials, exhibits great potential for direct fabricating net-shaped ceramic structures. However, due to limitation of sample size, reports on the macro properties of fabricated ceramic structures are still extremely lacking. In the present work, large-sized Al2O3ceramic samples were prepared using LENS technology to perform microstructural analysis and macro properties testing. Phase composition, grain characteristics and chemical purity of prepared samples were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF). Macro properties of large-sized samples, including the flexural strength and compressive strength, were given for the first time after being tested using a mechanical tester. Results show that microstructure of prepared Al2O3ceramics presents typical solidification characteristics and consists of grains that grow along the deposition height direction. Primary dendrite spacing of the Al2O3grains is about 60 µm. The phase is mainly composed of high-temperature-stable α-Al2O3and a relative density of 99.5% is obtained. No new impurities are introduced during the depositing process. Element type and element content of fabricated samples are highly consistent with those of original powder. Property test results show that, under current process conditions, the flexural strength and compressive strength of fabricated samples reaches the level of traditional sintering method, reaching the maximum of 350 MPa and 625 MPa respectively. © 2018 Elsevier Ltd and Techna Group S.r.l.
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/25235]
专题	中国科学院上海硅酸盐研究所
作者单位	1.Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian; Liaoning Province; 116024, China; 2.Shanghai Marine Equipment Research Institute, Shanghai; 200031, China
推荐引用方式 GB/T 7714	Niu, Fangyong,Wu, Dongjiang,Lu, Fan,et al. Microstructure and macro properties of Al2O3ceramics prepared by laser engineered net shaping[J]. Ceramics International,2018,44(12):14303-14310.
APA	Niu, Fangyong,Wu, Dongjiang,Lu, Fan,Liu, Gang,Ma, Guangyi,&Jia, Zhenyuan.(2018).Microstructure and macro properties of Al2O3ceramics prepared by laser engineered net shaping.Ceramics International,44(12),14303-14310.
MLA	Niu, Fangyong,et al."Microstructure and macro properties of Al2O3ceramics prepared by laser engineered net shaping".Ceramics International 44.12(2018):14303-14310.