Sintering of tungsten powder with and without tungsten carbide additive by field assisted sintering technology

被引:28
作者
Chanthapan, S. [2 ]
Kulkarni, A. [3 ]
Singh, J. [1 ]
Haines, C. [4 ]
Kapoor, D. [4 ]
机构
[1] Penn State Univ, Appl Res Lab, University Pk, PA 16802 USA
[2] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
[3] Penn State Univ, Dept Mech & Nucl Engn, University Pk, PA 16802 USA
[4] USA, ARDEC, Picatinny Arsenal, NJ USA
关键词
Field assisted sintering; Spark plasma sintering; Tungsten; Tungsten carbide; Grain growth; GRAIN TUNGSTEN; YTTRIUM-OXIDE;
D O I
10.1016/j.ijrmhm.2011.09.014
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Tungsten powder (0.6-0.9 mu m) was sintered by field assisted sintering technology (FAST) at various processing conditions. The sample sintered with in-situ hydrogen reduction pretreatment and pulsed electric current during heating showed the lowest amount of oxygen. The maximum relative density achieved was 98.5%, which is from the sample sintered at 2000 degrees C, 85 MPa for 30 min. However, the corresponding sintered grain size was 22.2 mu m. To minimize grain growth. nano tungsten carbide powder (0.1-0.2 mu m) was used as sintering additive. By mixing 5 and 10 vol.% WC with W powder, densification was enhanced and finer grain Size was obtained. Relative density above 99% with grain size around 3 tun was achieved in W-10 vol.% WC sintered at 1700 degrees C, 85 MPa, for 5 min. (C) 2011 Published by Elsevier Ltd.
引用
收藏
页码:114 / 120
页数:7
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