Ｍｇ‐Ａｌスピネルセラミックの微構造と強度に及ぼす組成の影響

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タイトル別名
  • Effect of Non-stoichiometry on Microstructure and Mechanical Strength of Mg-Al Spinel Ceramics
  • Mg Al スピネル セラミック ノ ビ コウゾウ ト キョウド ニ オヨボス

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抄録

Theoretically dense magnesium aluminum spinel ceramics with various MgO to Al2O3 ratio were prepared by hot-pressing with the same sintering condition, and effect of the compositional ratio on microstructure and mechanical strength of the spinel were examined. Results obtained were summarized as follows:<br>(1) Excess amount of MgO in the specimen inhibited slightly grain growth of spinel, but excess Al2O3 showed no significant effect on it.<br>(2) The bending strength of the specimen was increased by annealing in the temperature range from 900° to 1150°C.<br>(3) Among the sintered specimens which have nearly the theoretical density and the similar gram size, their bending strength and KIC-factor increased with the increase of Al2O3-content in the specimen. It was inferred that excess amount of MgO in the specimen resulted in the formation of non-uniform microstructure, which might increase flaw size in the specimen and consequently reduced the mechanical strength. In contrast, Al2O3-rich spinel ceramics showed higher strength, owing to the precipitation of very fine dispersed phase (Guinier-Preston Zone) during annealing process which was considered to reduce the flaw size and/or to inhibit crack propagation.<br>(4) In the case of the sintered specimens which have nearly theoretical density and the similar grain size distribution, bending strength of 49kg/mm2 and 67kg/mm2 were observed for equimolar and Al2O3-rich spinel specimens, respectively.

収録刊行物

  • 窯業協會誌

    窯業協會誌 87 (1005), 230-237, 1979

    公益社団法人 日本セラミックス協会

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