共沈法により調製したリン酸マグネシウム添加酸化マグネシウム粉末の焼結性(第3報) : 焼結体の物理的及び機械的性質

概要

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Changes in relative density and grain size of magnesium oxide (MgO) compact containing magnesium phosphate equivalent to 0.5 mol% P_2O_5 were investigated between 1200℃ and 1700℃ ; the bending strength, thermal expansion and water resistivity were examined for sintered compacts. The relative densities of MgO compacts with phosphate additions attained 96-99% as the sintering times at 1300℃ and at 1400℃ were prolonged from 5 to 30 h. The bending strength and the thermal expansion coefficient of MgO compact with phosphate addition sintered at 1400℃ for 30 h were 185 MPa (estimated value of10^<-6> ℃^<-1>(30°-1000℃), respectively ; the water-resistivity test (3 h-immersion at 90℃) showed that the weight increase due to the hydration of MgO to Mg(OH)_2 amounted only to 0.03%. The bending strength and water- resistivity of MgO compact was enhanced by the addition of phosphate.
社団法人日本セラミックス協会の論文
1989-05-01