放电等离子烧结制备高纯Ta<sub>2</sub>AlC陶瓷及其高温氧化行为

doi:10.11896/cldb.21010065

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Abstract High purity and bulk Ta₂AlC ceramics had been synthesized by self-propagating high-temperature synthesis, pressure-less sintering and spark plasma sintering, using Ta, Al and carbon black powders as raw materials. Microstructures and properties of the as-fabricated Ta₂AlC ceramics were investigated. The Vickers hardness, flexural strength and fracture toughness of the as-fabricated bulk Ta₂AlC ceramics are 5.6 GPa, 510 MPa and 6.16 MPa·m^1/2, respectively. The fast heating rate, short sintering time and fine grain formation in the spark plasma sintering resulted in a fine-grain strengthening effect which led to the high hardness and strength. The Ta₂AlC ceramics oxidized at the temperature range of 700—900 ℃ showed a linear oxidation kinetics trend. When the Ta₂AlC ceramic was oxidized at 700 ℃ for 15 h, the oxidation layer of the Ta₂AlC was mainly composed of Ta₂O₅. And the oxidation products would become Ta₂O₅ and AlTaO₄ while the oxidation temperature was risen up to 800—900 ℃.

Key words： Ta₂AlC spark plasma sintering mechanical property oxidation behavior

Published: 01 July 2021

CLC number:

TB321

Fund:Natural Science Foundation of China (11872171) and the Fundamental Research Funds for the Central Universities (B200202117).

About author:: Cong Hu, a master candidate, currently study in Hohai University, focusing on the research of nanolayered MAX and two-dimensional nanomaterials MXene.
Guobing Ying, the professor and doctoral supervisor of Hohai University, deputy director of Institute of Material Physics and Chemistry. He received his Ph.D. degree at Harbin Institute of Technology in 2011. He was a visi-ting scholar and adjunct professor of Drexel University during 2016—2018. He is a member of the Surface Deposition Technology Committee of the Chinese Mechanical Engineering Society, a member of the High-tech Ceramics Branch of the Chinese Ceramic Society, and a member of the Ceramic Matrix Composites Committee of the Jiangsu Composite Materials Society, etc. His research interests include Si₃N₄, Al₂O₃, MAX, MXene and other functional structural ceramics and ceramic matrix composites, metal matrix composites, mechanical behavior of materials and structures under extreme environment. He presided National Natural Science Fund and other projects. He has published more than 60 journal papers and 17 authorized invention patents.

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	HU Cong
	YING Guobing
	LIU Lu
	SUN Cheng
	WEN Dong
	ZHANG Jianfeng
	ZHANG Chen
	WANG Xiang
	WANG Cheng

Cite this article:

HU Cong,YING Guobing,LIU Lu, et al. Preparation and High-temperature Oxidation Behavior of High Purity Ta₂AlC Ceramics Prepared by Spark Plasma Sintering[J]. Materials Reports, 2021, 35(12): 12044-12048.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21010065 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12044

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