高強度高靭性ジルコニア
1995 年 111 巻 2 号 p. 67-69
詳細
1995 年 111 巻 2 号 p. 67-69
Characteristics of high fracture strength and high fracture toughness of zirconia in yttria doped tetragonal zirconia polycrystal (Y-TZP), Y-TZP/Al2O3 composites and ceria doped tetragonal zirconia polycrystal (Ce-TZP) are described in this paper. The maximum fracture strength of Y-TZP/Al2O3 composites is 2, 400MPa at 30°C The maximum fracture toughness of Ce-TZP is 20 MPam1/2
It is found that hot isostatic pressing is effective to eliminate fracture origins such as pore. From the results of thermal shock behavior of Y-TZP with various grain sizes by the water quenching method and the tetragonal to monoclinic phase transformation by using Raman microprobe spectroscopy, it is found that the critical quenching temperature different of Y-TZP increases from 250°C to 425°C with increasing grain size from 0.4 to 3.0μm.
