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通过抗热震参数分析和热循环试验研究了ZrO2 -Ni功能梯度材料 (FGM )的热冲击与热疲劳行为及其影响因素 .结果表明 ,ZrO2 -NiFGM抗热震参数呈梯度分布 ,ZrO2 侧抗热冲击断裂能力强而富Ni区热疲劳抗力高 .其热震破坏符合热疲劳损伤机理 ,裂纹的准静态扩展为其控制因素 .热疲劳裂纹在梯度层内以微孔聚集、连接方式萌生和扩展 ,而在梯度层间无横向贯穿裂纹 ,克服了传统陶瓷 /金属结合体的界面热应力剥离问题
The thermal shock resistance and thermal fatigue behavior of ZrO2 -Ni FGM were studied by means of thermal shock resistance parameter analysis and thermal cycling test. The results show that the thermal shock resistance parameters of ZrO2 -NiFGM are gradient distribution, The thermal shock resistance is high and the thermal fatigue resistance is high in the Ni-rich zone.The thermal shock failure conforms to the mechanism of thermal fatigue damage and the quasi-static expansion of the crack is the controlling factor.The thermal fatigue cracks are gathered in the gradient layer by micropores, Extension, and no horizontal transverse cracks in the gradient between layers, to overcome the traditional ceramic / metal interface thermal stress peel problem