【作者】 金学军； 赵诚； 张玉龙； 彭志明； 蒋丹宇； 施剑林；

【Author】 JIN Xuejun ZHAO Cheng ZHANG Yulong PENG Zhiming School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200030 JIANG Danyu,Sill Jianlin Shanghai Institute of Ceramics,The Chinese Academy of Sciences, Shanghai 200050

【机构】 上海交通大学材料科学与工程学院； 中国科学院上海硅酸盐研究所；

【摘要】 测量了不同 Y₂O₃稳定剂含量（摩尔分数分别为0．25%,0．50%和0．75%）对8Ce,Y-TZP 陶瓷的室温至250℃内耗特征的影响．结果表明,Y₂O₃含量为0．25%时,晶体结构为单斜相,无内耗峰出现,内耗呈单调增加；而 Y₂O₃含量为 0．50%和0．75%时,晶体结构为四方相,在内耗-温度曲线上出现弛豫内耗峰,模量单调减小,峰值为10^-3—10^-2,峰位随测试频率增加向高温移动,弛豫时间符合 Arrhenius 关系,内耗峰的积分强度与稳定剂的含量(即 Y³⁺离子的浓度)成正比,该内耗峰起源于 Y_Zr′V_?偶极子的再取向．更多还原

【Abstract】 The RT 250℃ internal frictions of Ce,Y-TZP ceramics with different contents of Y₂O₃ were measured.It was found that the monoclinic phase of 8Ce,0.25Y-TZP does not show damping peak and internal friction increases with temperature,while the tetragonal phases of 8Ce, 0.50Y-TZP and 8Ce,0.75Y-TZP demonstrates IF peaks with Q^-1of about 10^-3-10^-2and Young’s modulus decreases with temperature.No abrupt change of modulus was observed at the temperature correspondent to the damping peaks.IF peak shifts to higher temperature with the increase of mea- suring frequency（1 Hz,5 Hz and 20 Hz）.The relaxation time obeys an Arrhenius equation.The intensity of damping peaks is proportional to the content of Y₂O₃,i.e.,concentration of yttrium ions. RT-250℃ damping peaks are related to the reorientation of Y_Zr′V_?anisotropic complexes formed by oxygen vacancies and yttrium ions.更多还原