Simultaneous Synthesis and Densification of NiSi2 and NiSi2-20vol.%Nb Composite by Field-Activated and Pressure-Assisted Combustion

가압통전 활성연소에 의한 치밀한 NiSi2와 NiSi2-20vol.%Nb 복합재료 제조

  • Kim, H.C. (Department of Materials Engineering, Research Institute of Industrial Technology, Chonbuk National University) ;
  • Shon, I.J. (Department of Materials Engineering, Research Institute of Industrial Technology, Chonbuk National University) ;
  • Park, C.D. (Department of Materials Engineering, Research Institute of Industrial Technology, Chonbuk National University)
  • 김환철 (전북대학교 공과대학 재료공학과, 공업기술연구소) ;
  • 손인진 (전북대학교 공과대학 재료공학과, 공업기술연구소) ;
  • 박충도 (전북대학교 공과대학 재료공학과, 공업기술연구소)
  • Received : 2000.11.07
  • Published : 2001.01.31

Abstract

A method to simultaneously synthesize and consolidate the silicide $NiSi_2$ and the composite $NiSi_2$-20vol.%Nb from powders of Ni, Si, and Nb was investigated. Combustion synthesis was carried out under the combined effect of an electric field and mechanical pressure. The final density of the products increased nearly linearly with the applied pressure. Highly dense $NiSi_2$ and $NiSi_2$-20vol.%Nb with relative densities of up to 97% were produced under the simultaneous application of a 60MPa pressure and a 3000A current on the reactant powders. The respective Vickers microhardness values for these materials were 6.0 and 5.8 GPa. From indentation crack measurements, the fracture toughness values for $NiSi_2$ and $NiSi_2$-20vol.%Nb were calculated to be 3.3 and 4.7 $MPa{\cdot}m^{1/2}$, respectively.

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Acknowledgement

Supported by : 전북대학교