Sintering behavior and mechanical properties of WC-Al2O3 composites prepared by spark plasma sintering (SPS)

Wei Hsio Chen, Hao Tung Lin, Pramoda K. Nayak, Man Ping Chang, Jow Lay Huang

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

The sintering behavior of WC-Al2O3 composites prepared via spark plasma sintering (SPS) was investigated. The initial WC-Al2O3 nanocomposite powders were prepared via metal organic chemical vapor deposition in a spouted bed followed by carburization process. Then the nanocomposite powders were densified via SPS at 1400°C. The mechanical properties of sintered disks such as hardness and toughness were analyzed. The WC-Al2O3 composites show maximum toughness of 6.1 MPa·m1/2 and hardness value of 24 GPa, which are higher than those of monolithic alumina. Microstructure observations indicate that WC nanoparticles are dispersed within the alumina matrix which limit the grain growth of alumina matrix. The fracture mode changes from intergranular in the case of monolithic Al2O3 to transgranular mode for nanocomposites to reinforce their mechanical properties.

Original languageEnglish
Pages (from-to)414-417
Number of pages4
JournalInternational Journal of Refractory Metals and Hard Materials
Volume48
DOIs
Publication statusPublished - 2015 Jan

All Science Journal Classification (ASJC) codes

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

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