摘要
本文通过X衍射技术和多晶法计算研究了ZrO_2-Al_2O_3和ZrO_2-Al_O_3-Y_2O_3陶瓷材料的相结构变化。结果表明,在ZrO_2-Al_2O_3体系中,在低Al_2O_3含量时,主要相是单斜相。随着Al_2O_3含量增大,单斜相比率系数X_m下降,四方相含量明显增大。在ZrO_2-Al_2O_3体系中添加Y_2O_3后,Y_2O_3可以促进形成四方相和稳定相系的作用,使三元系转变为四方结构。烧结温度对ZrO_2-Al_2O_3系相结构变化影响不明显,但对ZrO_2-Al_2O_3-Y_2O_3系影响较大,低Y_2O_3含量时,温度升高可促进相系的转移;而高Y2O_3含量时,已完全转变为四方结构。所以,烧结温度对相结构变化无影响。
Transformation of the phase structure in the ZrO_2-Al_2O_3 and ZrO_2-A1_2O_3-Y_2O_3 ceramic materials was studied by X-ray diffraction technique and calculation of polymorphy method. The results obtained indicate that monoclinic phase were main phase in the ZrO_2-Al_2O_3 system at low A1_2O_3 contents. The monoclinic intensity ratio X_m decreases with increasing A1_2O_3 content in the ZrO_2-Al_2O_3, whereas the amount of tetragonal phase increases evidently. Adding Y_2O_3 in the ZrO_2-Al_2O_3 system, Y_2O_3 can promote formation of the tetragonal phase and stabilize phase system, in order that ternary system transform tetragonal structure. Sintered temperature has little effect on the transformation of phase structure for the ZrO_2-A1_2O_3 system, but has great effect on the ZrO_2-Al_2O_3-Y_2O_3 at low Y_2O_3 contents, raising temperature can promote transition of the phase system, while at high Y_2O_3 contents, the ZrO_2-Al_2O_3-Y_2O_3 system been changed into tetragonal structure completely. So sintered temperature has no effect on the transformation of phase structure.
关键词
陶瓷
ZRO2
AL2O3
Y2O3
相结构
Monoclinic intensity ratio
Phase structure
X-ray
Martensitic
Dispersion
Stress-induced
