1996 Volume 43 Issue 4 Pages 426-432
Well-densified composites with the compositions of ZrO2(2Y)/WSi2=60/40 and 80/20 mol% have been fabricated by hot isostatic pressing for 2 h at 1500°C and 196 MPa. Electric resistivities (ρ) between both composites change drastically; the former and latter composites correspond to the metallic and insulating materials, respectively. They are strongly dependent on the textures. Laminated materials with the compositions of ZrO2(2Y)/WSi2 =(60/40)/(80/20)/(60/40) mol% have been able to be prepared by the same technique. Overall electric resistivities in the perpendicular and parallel directions for the interfaces are determined to be ρ⊥≈1×1011 and ρ//≈1×10-4 Ω⋅cm, respectively. The residual stress as much as ≈200 MPa is induced in the interfaces. The fracture toughness (KIC) is much affected by the residual stress.
