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Supersolidus Liquid-Phase Sintering Of Iron-Base Metal Matrix Composites Containing TiN-Coated Oxide Particles

  • : Sebastian Brust1, Arne Röttger1, Werner Theisen1
  • : 1Ruhr-Universität Bochum
  • : PDF Download
  • : 2016

Abstract

This paper deals with novel wear-resistant iron-base metal-matrix composites (MMC) containing coated oxide particles that are consolidated by supersolidus liquid-phase sintering (SLPS). Until now, the use of oxides as substitutes for high-cost hard particles, such as fused tungsten carbide (FTC), has been limited due to the poor wettability of oxides by iron melts and the associated weak metallurgical bonding between the oxide particles and the matrix material. To counteract these problems, the particles can be coated with a thin layer of titanium nitride (TiN) by means of chemical vapor deposition (CVD), which improves the wettability and enhances the bonding of the particle to the matrix phases. This work shows that such a thin TiN film can improve wetting of an Fe-base hardfacing alloy on alumina and zirconia and that this improved wettability enables production of Febase MMC-containing oxide particles by means of supersolidus liquid-phase sintering.

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