Processing and properties of boron carbide with hafnium Diboride addition

K. Sairam, J.K. Sonber, T.S.R.C.H. Murthy, B. Paul, K.N. Achiket, N. Jothilakshmi, R.D. Bedse, V. Kain

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Abstract

This article presents the results of investigations on densification, mechanical and electrical properties of boron carbide (B₄C) with the addition of HfB₂. High dense B₄C-HfB₂ (2.5-30 wt.%) composites were prepared by hot pressing at a temperature of 2173 K with 40 MPa mechanical pressure. The B₄C-HfB₂ composite mixture exhibited a better sintering aptitude compared with monolithic B₄C. Hardness and elastic modulus of B₄C-HfB₂ composites were measured to be in the range 36-28GPa and 465-525GPa respectively. Indentation fracture toughness of B₄C increased with HfB₂ content and obtained a maximum of 7 MPa.m 1/2 at 30 wt.% HfB₂, which is ∼3 times higher than the monolithic B₄C. Crack deflection was identified to be the major toughening mechanism in the developed composite. B₄C-10wt.% HfB₂ composite exhibited a maximum electrical conductivity of 7144 Ω-1m-1 which is 26% higher than the conductivity of monolithic B₄C (5639 Ω-1m-1) at 1373 K.
Original languageEnglish
Pages (from-to)330-337
JournalCeramics - Silikaty
Volume60
Issue number4
DOIs
Publication statusPublished - 30 Jul 2016

Keywords

  • boron carbide
  • hafnium diboride
  • hot pressing
  • mechanical properties
  • electrical conductivity

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