Strength and fracture toughness of zirconia crystals

摘要: Abstract Single crystals up to 40 mm wide and 120 long made of zirconia with yttria addition were investigated over the temperature range −140 1400°C by methods conventionally used for advanced ceramics. The stress-strain curves analysed. Up 1000°C all linear (the ‘brittleness measure’, χ = 1), on heating a minimum value measure’ partially stabilized was 0·73. At MOR cubic single is almost 2 times higher than at 20°C greatly dependent loading rate. strength PSZ decreases an increase in temperature. decrease test from ambient −140°C results 20% these crystals, latter being practically independent relation between elastic moduli fracture toughness investigated. A maximum K Ic 16 M Pa m 1 Ed 301 G measured. It shown that R-curves are flat barrier effect exists. mechanical behaviour also studied Vickers indentation. Partial substitution ytterbia increases materials. fractographic investigations analyse data. Information sufficient compare crystal materials ceramics necessary estimate their potential applications ambient- high-temperature devices has been obtained.