Microstructure and mechanical properties of the spark plasma sintered TaC/SiC composites

被引：35
作者：
Liu, Limeng [1 ,2 ]
Ye, Feng [2 ]
Zhang, Zhiguo [1 ]
Zhou, Yu [2 ]
机构：
[1] Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 529卷
基金：
中国博士后科学基金;
关键词：
Tantalum carbides; Densification; Spark plasma sintering; Mechanical properties; HIGH-TEMPERATURE CERAMICS; TANTALUM CARBIDE; OXIDATION-RESISTANCE; BORON-CARBIDE; ADDITIVES; BEHAVIOR; TAC; DENSIFICATION; PRESSURE; MOSI2;
D O I：
10.1016/j.msea.2011.09.079
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
TaC/SiC composites with 5-40 vol.% 6H-SiC were fabricated by spark plasma sintering at 1800 degrees C for 5 min. Effects of SiC concentrations on the densification, microstructure, and mechanical properties of the materials were investigated. The results showed the densification process of the TaC/SiC composites was composed of six sequent stages. SiC addition was effective in eliminating the closed porosities in the final stage to yield fully dense TaC/SiC composites at 20 vol.% SiC concentrations and above. TaC grain sizes decreased with SiC concentration increase. The 40 vol.% SiC composition had the highest flexure strength and fracture toughness up to 703 MPa and 6.8 MPa m(1/2) due to the reinforcement of the SIC agent. The TaC/SiC composites with 20 and 40 vol.% SiC showed good flexural strength at 1400 degrees C. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：479 / 484
页数：6
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