湿式加圧成形法を用いたMoSi_2/ZrO_2(2モル%Y_2O_3)系傾斜機能材料の作製 Fabrication of Functionally Graded MoSi_2/ZrO_2 (2mol% Y_2O_3) Materials by Wet-Molding Process
Functionally graded MoSi<SUB>2</SUB>/ZrO<SUB>2</SUB>(2Y) materials with high density (97.5% of theoretical) have been fabricated by uniaxial wet-molding, followed by hot pressing (1000°C/1h/30MPa) and hot isostatic pressing (1400°C/2h/196MPa). Their composition profiles are much influenced by the viscosity of the mixed solutions of glycerin and ethanol used as dispersion media; a linear compositional gradient from MoSi<SUB>2</SUB>/ZrO<SUB>2</SUB>(2Y)≈70/30 to≈20/80 mol% is obtained from the solution (50/50 vol%) with the viscosity of 20 mPa⋅s. Vickers hardness Hv and fracture toughness K<SUB>Ic</SUB> increase from 9.7 to 12.4 GPa and 5.1 to 12.5 MPa⋅m<SUP>1/2</SUP>, respectively, with increasing ZrO<SUB>2</SUB>(2Y) composition.
粉体および粉末冶金 44(6), 565-569, 1997-06-15
Japan Society of Powder and Powder Metallurgy