Spark plasma sintered tantalum carbide: Effect of pressure and nano-boron carbide addition on microstructure and mechanical properties

被引：86

作者：

Bakshi, Srinivasa R. ^{[1
]}

Musaramthota, Vishal ^{[1
]}

Lahiri, Debrupa ^{[1
]}

Singh, Virendra ^{[2
,3
]}

Seal, Sudipta ^{[2
,3
]}

Agarwal, Arvind ^{[1
]}

机构：

[1] Florida Int Univ, Plasma Forming Lab, Nanomech & Nanotribol Lab, Dept Mech & Mat Engn, Miami, FL 33174 USA

[2] Univ Cent Florida, AMPAC, Orlando, FL 33816 USA

[3] Univ Cent Florida, Nanosci Technol Ctr, Orlando, FL 33816 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 03期

关键词：

Tantalum carbide; Boron carbide; Spark plasma sintering; Grain growth; Densification; HIGH-TEMPERATURE CERAMICS; TA-C SYSTEM; DENSIFICATION; COMPOSITES; BEHAVIOR; HFC; POWDER; FIELD;

D O I：

10.1016/j.msea.2010.10.009

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

TaC and TaC-1 wt.% B4C powders were consolidated using spark plasma sintering (SPS) at 1850 degrees C and varying pressure of 100, 255 and 363 MPa. The effect of pressure on the densification and grain size is evaluated. The role of nano-sized B4C as sintering aid and grain growth inhibitor is studied by means of XRD, SEM and high resolution TEM. Fully dense TaC samples were produced at a pressure of 255 MPa and higher at 1850 degrees C. The increasing pressure also resulted in an increase in TaC grain size. Addition of B4C leads to an increase in the density of 100 MPa sample from 89% to 97%. B4C nano-powder resists grain growth even at high pressure of 363 MPa. The formation of TaB2/Carbon at TaC grain boundaries helps in pinning the grain boundary and inhibiting grain growth. The effect of B4C addition on hardness and elastic modulus measured by nanoindentation and the indentation fracture toughness has been studied. Relative fracture toughness increased by up to 93% on B4C addition. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1287 / 1295

页数：9

共 40 条

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