ホットフォージ法で作製したマグネシア焼結体の微構造と機械的性質

概要

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Ultra fine MgO powder prepared by oxidation of Mg vapor was encupslated in a Mo mold with dimensions of O.D.30φ-I.D.10φ×30^h mm. The mold was preheated at 1300℃ for 10 minutes, and then, immediately press-forged under uniaxial compressive load. The particle size of the starting powder (0.001 μm) grew to 0.3〜0.4 μm during the preheating, but the grown particles were broken down by the mechanical fracture effect in the press-forge process and a dense polycrystal with smaller grain size (0.1 〜0.15 μm) was obtained by a masstransport mechanism. However, the polycrystalline MgO obtained did not show satisfactory mechanical properties, because of some stored internal stress around the grain boundary. A polycrystalline MgO with good mechanical properties was obtained after annealing the press-forged body at a relatively low temperature of 800〜1000℃ for few hours to remove the strain. An attempt was made to understand clearly the above experimental results. It was also emphasized the importance to develope a new technique for sintering the ultra fine ceramic powders.
社団法人日本材料学会の論文
1992-06-15