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Effect of Humidity on Delayed Propagation of Indentation Crack under Sustained Electric Field in Ferroelectric Ceramics

机译:湿度对持续电场下铁电陶瓷压痕裂纹延迟扩展的影响

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The effect of humidity on delayed propagation of indentation crack in lead zirconate titanate ferroelectric ceramics under sustained electric field was investigated. The results indicated that delayed propagation ofindentation crack could occur in humid air at 98%RH without electric field but it did not in air at RH ≤30%. The threshold electric field and incubation time for delayed propagation of indentation crack increased but the increment of propagation length decreased with decreasing the humidity. When the electric field is large of 0.14 times of the coercive field the delayed propagation could also occur in vacuum
机译:研究了在持续电场下,湿度对锆酸钛酸铅铁电陶瓷压痕裂纹延迟扩展的影响。结果表明,在没有电场的情况下,在湿度为98%RH的潮湿空气中,压痕裂纹的延迟传播可能会发生,而在RH≤30%的空气中则不会出现。压痕裂纹延迟传播的阈值电场和保温时间增加,但随着湿度的降低,传播长度的增加减小。当电场大为矫顽场的0.14倍时,在真空中也可能发生延迟传播

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