Mechanical properties of phase-pure bulk Ta4AlC3 prepared by spark plasma sintering and subsequent heat treatment

Ying Guobing; Hu Cong; Liu Lu; Sun Cheng; Wen Dong; Zhang Jianfeng; Zheng Yongting; Wang Minghui; Zhang Chen; Wang Xiang; Wang Cheng

doi:10.2298/PAC2103211Y

Processing and Application of Ceramics (Sep 2021)

Mechanical properties of phase-pure bulk Ta4AlC3 prepared by spark plasma sintering and subsequent heat treatment

Ying Guobing,
Hu Cong,
Liu Lu,
Sun Cheng,
Wen Dong,
Zhang Jianfeng,
Zheng Yongting,
Wang Minghui,
Zhang Chen,
Wang Xiang,
Wang Cheng

Affiliations

Ying Guobing: Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing, China
Hu Cong: Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing, China
Liu Lu: Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing, China
Sun Cheng: Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing, China
Wen Dong: Key Laboratory of Superlight Materials & Surface Technology (Harbin Engineering University), Ministry of Education, Harbin, China
Zhang Jianfeng: Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing, China
Zheng Yongting: Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, China
Wang Minghui: Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing, China
Zhang Chen: Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing, China
Wang Xiang: Key Laboratory of Superlight Materials & Surface Technology (Harbin Engineering University), Ministry of Education, Harbin, China
Wang Cheng: Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing, China

DOI: https://doi.org/10.2298/PAC2103211Y
Journal volume & issue: Vol. 15, no. 3
pp. 211 – 218

Abstract

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High-purity and bulk Ta4AlC3 ceramics were successfully fabricated by spark plasma sintering (SPS) and subsequent heat treatment, using the raw materials including TaC and Ta2AlC powders. These raw materials were first synthesized by self-propagation high temperature synthesis from elements tantalum, aluminium and carbon black powders, followed by pressure-less sintering. The as-fabricated bulk Ta4AlC3 was relatively stable when subjected to heat treatment at elevated temperature of 1500°C. Moreover, prolonging the heat treatment time resulted in bigger grain sizes and higher densities of the Ta4AlC3. The flexural strength and the fracture toughness of the Ta4AlC3 fabricated by SPS were found to be 411MPa and 7.11MPa•m1/2, respectively. After the heat treatment at 1500°C for 8 h, the flexural strength and the fracture toughness of the Ta4AlC3 could reach 709MPa and 9.23MPa•m1/2, respectively. The special structural characteristics of the ternary ceramics and the increase of density after the heat treatment are the main reasons for the variation in mechanical properties of ternary ceramics.

Published in Processing and Application of Ceramics

ISSN: 1820-6131 (Print); 2406-1034 (Online)
Publisher: University of Novi Sad
Country of publisher: Serbia
LCC subjects: Technology: Chemical technology: Clay industries. Ceramics. Glass
Website: http://www.tf.uns.ac.rs/publikacije/PAC/index.html

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