【摘要】 ＰＺＴ压电陶瓷单边缺口恒载荷试样两面镀镍后在ＮａＯＨ溶液中动态充氢时能发生氢致滞后断裂．研究了氢致滞后断裂门槛应力强度因子和试样中可扩散氢浓度的定量关系．结果表明,氢致断裂归一化门槛应力场强度因子ＫＩＨ/ＫＩＣ(ＫＩＣ＝１．３４Ｍｐａ·ｍ１/２)随氢浓度对数的升高而线性下降,即ＫＩＨ/ＫＩＣ＝０．４－０．１５５ｌｎＣｏ．当Ｃｏ＝９．８４×１０－４%(对应充氢电流３００ｍＡ/ｃｍ２)时,ＫＩＨ＝０．０１ＫＩＣ．这表明,ＰＺＴ陶瓷具有极高的氢致开裂敏感性．更多还原

【Abstract】 Hydrogen-induced delayed fracture of PZT ceramics during dynamic charging under constant load has been studied. The results show that the normalized threshold stress intensity of hydrogen-induced fracture, Km/KIc(KIc=1.34 MPa·m1/2), decreased linearly with the logarithm of hydrogen concentration in the specimen, C0, i.e., KIH/KIC= 0.4-0.155 In C0. When C0=9.84×l0-40% corresponding to i=300 mA/cm2 in the NaOH solution, KIH=0.01KIC=0.013 MPa·m1/2.更多还原