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Journal of Materials Science

, Volume 26, Issue 18, pp 5037–5040 | Cite as

Sintering and characterization of Al2O3-B4C composites

  • Choong-Hwan Jung
  • Chong-Hee Kim
Papers

Abstract

The effect of B4C on the densification, microstructure and mechanical properties of pressureless sintered Al2O3-B4C composites have been studied. Sintering was performed without sintering additives with varying B4C content from 0–40 vol %. Up to 20 vol % B4C, more than 97% theoretical density was always obtained when sintered at 1850 °C for 60 min. On increasing the sintering time from 30–120 min, there was no change in density. The result of X-ray diffraction analysis showed that no reaction occurred between Al2O3 and B4C. The grain growth of Al2O3 was inhibited by B4C particles pinned at the grain boundary and the grain-boundary drag effect. The critical amount of B4C to drag the grain boundary migration effectively was believed to occur at 10 vol % B4C sintered at 1850 °C for 60 min. The maximum three-point flexural strength was found to be 550 MPa for the specimen containing 20 vol % B4C, and the maximum microhardness was 2100 kg mm−2 for 30 vol % B4C specimen.

Keywords

Polymer Microstructure Mechanical Property Migration Al2O3 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • Choong-Hwan Jung
    • 1
  • Chong-Hee Kim
    • 1
  1. 1.Department of Materials Science and EngineeringKorea Advanced Institute of Science and TechnologySeoulKorea

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