Sintering, mechanical, and oxidation properties of TiC-Ni-Mo cermets obtained from ultra-fine TiC powders

Zhezhen Fu, Jia Huey Kong, Sai Ram Gajjala, Rasit Koc

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

This paper studies the sintering, microstructure, mechanical, and oxidation properties of TiC-Ni-Mo cermets obtained from ultra-fine TiC powders. The TiC powders were synthesized from a novel carbon coated precursors carbothermal reduction method. The weight percentage of TiC was 75 wt%, the Mo phase increased from 0 to 20 wt%, and the Ni phase balanced the composition. At a sintering temperature of ∼1500 °C for 1 h with argon flowing, the utilization of the ultra-fine TiC powders results in high relative density (>98%), fine microstructure, and good mechanical properties. The Mo substitution can further: (1) enhance the relative density to above 99.5%; (2) lead to the formation of core-rim structure; (3) refine the grain size from ∼1.3 ± 0.1 to ∼1.0 ± 0.1 μm with Mo content at 10 wt%; (4) enhance the hardness and fracture toughness to 14.9 ± 1.2 GPa and 15.4 ± 1.1 MPa m1/2 with Mo content at 10 wt%; (5) greatly enhance the oxidation resistance with 20 wt% Mo substitution.

Original languageEnglish (US)
Pages (from-to)316-323
Number of pages8
JournalJournal of Alloys and Compounds
Volume751
DOIs
StatePublished - Jun 30 2018

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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