Fabrication and mechanical properties of continuously graded WSi{sub 2}-ZrO{sub 2}(2Y) materials using wet-molding
- Doshisha Univ., Kyoto (Japan). Dept. of Molecular Science and Technology
Continuously graded WSi{sub 2}-ZrO{sub 2}(2Y) materials with high density (99.2% of theoretical) have been fabricated by uniaxial wet-molding, followed by hot pressing (1,000 C/1h/30MPa) and hot isostatic pressing (1,500 C/2h/196MPa). A mixed solution of glycerin and ethanol with the viscosity of {approx} 6 mPa{center_dot}s has been used as a dispersion medium in the molding process. The sintered materials show a linear composition profile with a transition from WSi{sub 2}/ZrO{sub 2}(2Y) {approx} 75/25 to {approx} 5/95 mol%. Vickers hardness, Hv, for which the value is {approx} 11.2 GPa, is almost independent of the compositional change. Fracture toughness, K{sub C}, increases from 5.6 to 10.3 MPa{center_dot}m{sup 1/2} with increasing ZrO{sub 2}(2Y) composition.
- OSTI ID:
- 616357
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 33; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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