Electrical and mechanical properties of ZrO{sub 2}(2 mol% Y{sub 2}O{sub 3})/WSi{sub 2} composites and their laminated materials
- Doshisha Univ., Tanabe, Kyoto (Japan). Dept. of Molecular Science and Technology
Well-densified composites with the compositions ZrO{sub 2}(2Y)/WSi{sub 2} = 60/40 and 80/20 mol% have been fabricated by hot isostatic pressing for 2 h at 1,500 C and 196 MPa. Electric resistivities ({rho}) of the two composites are very different; the former and latter composites correspond to metallic and insulating materials, respectively. The properties are strongly dependent on the textures. Laminated materials with the ZrO{sub 2}(2Y)/WSi{sub 2} = (60/40)/(80/20)/(60/40) mol% have been prepared by the same technique. Overall electric resistivities in directions perpendicular and parallel to the interfaces have been determined to be {rho}{sub {perpendicular}} {approx} 1 {times} 10{sup 11} {Omega} {center_dot} cm and {rho}{sub {parallel}} {approx} 1 {times} 10{sup {minus}4} {Omega} {center_dot} cm, respectively. Residual stress as much as {approx} 150 MPa is induced in the interfaces. The fracture toughness (K{sub Ic}) is greatly affected by the residual stress.
- OSTI ID:
- 230710
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 31; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fabrication and mechanical properties of continuously graded WSi{sub 2}-ZrO{sub 2}(2Y) materials using wet-molding
Microstructure and mechanical properties of hot isostatically pressed zirconia (2 mol% yttria)-reinforced tungsten disilicide composites