Fabrication and mechanical properties of continuously graded MoSi{sub 2}-ZrO{sub 2}(2Y) materials using wet-molding
- Doshisha Univ., Tanabe, Kyoto (Japan). Dept. of Molecular Science and Technology
Continuously graded MoSi{sub 2}-ZrO{sub 2}(2Y) materials with high density (97.5% of theoretical) have been fabricated by uniaxial wet-molding, followed by hot pressing (1,000 C/1 h/30 MPa) and hot isostatic pressing (1,400 C/2 h/196 MPa). Their composition profiles are greatly influenced by the viscosity of mixed solutions of glycerin and ethanol used as a dispersion medium; a linear compositional gradient from MoSi{sub 2}/ZrO{sub 2}(2Y) = 70/30 to {approximately}20/80 mol% is obtained from the solution (50/50 vol%) with a viscosity of {approximately}20 mPa{center_dot}s. Vickers hardness (H{sub v}) and fracture toughness (K{sub IC}) increase from 9.7 to 12.4 GPa and from 5.1 to 12.5 MPa{center_dot}m{sup 1/2}, respectively, with increasing ZrO{sub 2}(2Y) composition.
- OSTI ID:
- 532948
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 8 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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