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Title: Zirconium Carbide Produced by Spark Plasma Sintering and Hot Pressing: Densification Kinetics, Grain Growth, and Thermal Properties

Spark plasma sintering (SPS) has been employed to consolidate a micron-sized zirconium carbide (ZrC) powder. ZrC pellets with a variety of relative densities are obtained under different processing parameters. The densification kinetics of ZrC powders subjected to conventional hot pressing and SPS are comparatively studied by applying similar heating and loading profiles. Due to the lack of electric current assistance, the conventional hot pressing appears to impose lower strain rate sensitivity and higher activation energy values than those which correspond to the SPS processing. A finite element simulation is used to analyze the temperature evolution within the volume of ZrC specimens subjected to SPS. The control mechanism for grain growth during the final SPS stage is studied via a recently modified model, in which the grain growth rate dependence on porosity is incorporated. Finally, the constant pressure specific heat and thermal conductivity of the SPS-processed ZrC are determined to be higher than those reported for the hot-pressed ZrC and the benefits of applying SPS are indicated accordingly.
 [1] ;  [2] ;  [2] ;  [3] ;  [4]
  1. San Diego State Univ., San Diego, CA (United States). Dept. of Mechanical Engineering
  2. General Atomics, San Diego, CA (United States)
  3. US Army Armament Research Development Engineering Center, Picatinny Arsenal, NJ (United States)
  4. San Diego State Univ., San Diego, CA (United States). Dept. of Mechanical Engineering; Univ. of California, San Diego, CA (United States). Dept. of NanoEngineering
Publication Date:
OSTI Identifier:
Grant/Contract Number:
SC0008581; DBI-0959908
Accepted Manuscript
Journal Name:
Additional Journal Information:
Journal Volume: 9; Journal Issue: 7; Journal ID: ISSN 1996-1944
Research Org:
San Diego State University
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE zirconium carbide; spark plasma sintering; finite element simulation; grain growth; thermal properties