超塑性Y-TZP增韧陶瓷超细粉末的研究

用化学共沉淀法制备了3mol％Y_2O_3-ZrO_2超细粉末。利用热分析,x射线,透射电镜,颗粒粒度分析仪分析了粉料的相组成;颗粒形貌、大小;粉料的团聚状态;化学组成的均一性以及其烧结性能,并结合烧结试样的显微结构和力学性能对粉末的性能做出了评价。实验表明,所制备的粉料组成较为均匀;粒度分布窄;团聚体尺寸小,烧结活性高;颗粒粒度约为200(?)。粉料的相组成主要为四方相和约26％的单斜相。3Y-TZP陶瓷材料三点弯曲强度达1479.14MPa,断裂韧性为13.2MPa·m~(1/2),超塑性压缩变形达190％。

A STUDY OF THE ULTRA-FINE POWDERS OF THE Y-TZP TOUGHENED CERAMICS OF SUPERPLASTICITY

3mol% Y_2O_3-ZrO_2 ultrafine powders were prepared by coprecipitation method. The phase composition; particle morphology, size and size distribution; the state of agglomeration; the homogeneity of chemical composition and the sintering behavior of the powders were analyzed by the thermal analysis, x-ray diffraction, TEM and Particles Size Analysis. The Properties of the prepared powders were also evaluated in view of the microstructure and mechanical properties of the sintered samples. Experimental results show that the disperson of the prepared powders is relatively homogeneous, the particle size distribution is narrow, the agglomeration size small and sinterability high. The average particle size was of the order of 200A. The phases of the powders were mainly tetragonal and about 26% monoclinic. For the 3mol% Y-TZP toughened ceramics, the bending strength and the fracture toughness were 1479.14 MPa, and 13.2 MPa. m~(1/2) respectively. The superplasticity of the compressive deformation was as high as 190%.