放電プラズマ焼結によるMgO粒子分散Ni粉末のち密化

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タイトル別名
  • Densification During Spark Plasma Sintering of Ni Powder Containing Dispersed MgO Particles
  • ホウデン プラズマ ショウケツ ニ ヨル MgO リュウシ ブンサン Ni フンマツ ノ チミツカ

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抄録

It is known that metal powders containing dispersed oxide particles are difficult to sinter by the conventional process. Spark Plasma Sintering (SPS) method was tried for making the dense sinter tablets from Ni powders containing MgO. The high-temperature hardness of the sinter tablets were examined from room temperature to 1173 K. The results were summarized as the follows.<BR>The relative density of the tablets increased with an increase in sintering temperature. The relative density of more than 97% was obtained at higher temperature than 1273 K with MgO contents of 0, 2.5, 5 and 10%. The Vickers hardness of the sinter tablets increased with an increase in MgO contents and an increase in sintering temperature. The maximum hardness of about 270 Hv, which corresponded to more than 2.5 times of pure Ni, was obtained with 10%MgO at 1273 K sintering. These high relative density and hardness can be obtained by SPS method but not by the conventional sintering.<BR>The high-temperature hardness decreased with an increase in the temperature. Plotting the logarithm of hardness against the temperature, two straight lines were obtained. The reflection point which showed the change in deformation mode was shifted to high-temperature side by the dispersion of MgO particles. The high-temperature hardness straightly increased against a reciprocal of a space between MgO particles.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 65 (2), 122-127, 2001

    公益社団法人 日本金属学会

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