各種ケイ酸塩結晶の機械的性質(第1報)

概要

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Elastic modulus, Vickers hardness, fracture toughness, bending strength and thermal expansion coefficient of hot pressed silicate crystals ( wollastonite, anorthite, gehlenite, diopside and cordierite) have been measured. The following relationships were obtained between bulk modulus K and Young's modulus E, and mean atomic volume V, K = h_1V^f, E = K_2 V^g where f = -2.7, g =-2.8. Diopside had the highest Young's modulus of 158.1 GPa, and anorthite had the lowest oj 89.9 GPa. Vickers hardness, fracture toughness and bending strength were in the range of 564 -924 kg/mm^2, 1.64 -2.02 MPa・m^<1/2> and 124 -300 MPa, respectively. These properties of diopside showed the largest values in five silicate crystals. A linear relationship was obtained between bending strength and Young's modulus for silicate crystals except anorthite. Anorthite had a high strength in spite of lower Young's modulus. Thermal expansion coefficient was the smallest for cordierite. The thermal expansion coefficient of anorthite and diopside were 4.7X10^<-6> and 10.7X10^<-6> l/K, respectively.
社団法人日本セラミックス協会の論文
1989-05-01