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Mechanical properties of Al2O3/Mo/MnO2 composite

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2006, 16(4), pp.172-179
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Hyun Park 1,  Kyung-Nam Kim 1

1강원대학교

Accredited

ABSTRACT

When Al2O3-MoO3 mixture is reduced, MoO3 is only reduced to Mo at 900oC. But a compound between Al2O3 and Mo is not formed up to 1300oC. In the case of Al2O3-MoO3-MnO2 mixture, an intermediate compound Mn2Mo3O8 is firstly formed at 900oC and changes to MnAl2O4 at 1100oC~1300oC. Al2O3/Mo/MnO2 composite are manufactured by a selective reduction process in which Mo is only reduced in the powder mixture of Al2O3, MoO3 and MnO2 oxide. For Al2O3/Mo composite, the average grain size was not changed with increasing Mo content because of inhibition of grain growth of Al2O3 matrix in the presence of Mo particles. Fracture strength increased with increasing Mo content due to phenomenon of grain growth inhibition of Al2O3 matrix. Hardness decreased because of a lower hardness value of Mo, whereas fracture toughness increased. For Al2O3/Mo/MnO2 composite, grain growth was facilitated by MnO2 and it showed a lower fracture strength because of grain growth effect with increasing Mo and MnO2 content. Hardness decreased because of the grain growth of matrix and coalesced Mo particles to be located in grain boundary, whereas fracture toughness increased.Key words Al2O3/Mo/MnO2 composite, Selective reduction process, Hot pressingAl2O3/Mo/MnO2 복합재료의 기계적 특성박현?, 김경남강원대학교 신소재화학공학부, 삼척, 245-711(2006년 7월 19일 접수)(2006년 8월 4일 심사완료)

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