ELECTRICAL AND MECHANICAL-PROPERTIES OF ZRO2(2 MOL-PERCENT Y2O3)MOSI2COMPOSITES AND THEIR LAMINATED MATERIALS

Well-densified composites with the compositions ZrO2(2Y)/MoSi2 = 60/40 and 80/20 mol% have been fabricated by hot isostatic pressing for 2 h at 1400 degrees C and 196 MPa. Electric resistivities (rho) of the tw o composites are very different; the former and latter composites corr espond to metallic and insulating materials, respectively. The propert ies are strongly dependent on the textures. Laminated materials with t he compositions ZrO2(2Y)/MoSi2 = (60/40)/(80/20)/(60/40) mol% have bee n prepared by the same technique. Overall electric resistivities in di rections perpendicular and parallel to the interfaces have been determ ined to be rho(perpendicular to) approximate to 1x10(11) Omega . cm an d rho(parallel to) approximate to 1x10(-4) Omega . cm, respectively. R esidual stress as much as approximate to 150 MPa is induced in the int erfaces. The fracture toughness (K-Ic) is greatly affected by the resi dual stress.