常圧焼結とカプセルフリーHIPを用いたMgF_2焼結体の作製

概要

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The aim of this study is to prepare dense MgF_2 sintered body by normal sintering combined with capsule-free hot-isostatic pressing(HIPing)treatment. LiF was effective sintering aid for MgF_2. MgF_2 body of 95% relative density was obtained by adding 0.4mass% of LiF in the sintering at temparature above 798 K. The relative density decreased in the temperature range above 923 K. MgF_2 above 97% relative density after normal sintering was almost densified to the theoretical density by capsule-free HIPing treatment at 823 K under the pressure of 180 MPa in Ar atmosphere. The decrease of relative density at higher temperatures was explained by the growth of pores at grain boundary with grain growth and the evaporation of LiF during sintering. Bending strength, Vickers hardness, Young's modulus and thermal expansion coefficient of MgF_2 were also measured.
社団法人日本セラミックス協会の論文
1999-12-01