铜合金表面Fe基铸渗层的热疲劳性能研究

Study on Thermal Fatigue Characteristic of Fe-based Infiltrated Layer on Copper Substrate

用负压铸渗法制备了铜合金表面铁基渗层并研究了其热疲劳性能。结果表明:热循环次数小于20次时,渗层表面出现一定程度的氧化,无微裂纹产生;当热循环次数超过60次时,渗层与基体的结合界面处以及渗层表面会产生微裂纹;渗层表面及渗层与基体的结合界面处第一次出现微裂纹的时间随渗层厚度增加而不同程度的提前。

Fe-based infiltrated layer was prepared on copper substrate through vacuum infiltration casting technology and thermal fatigue property of the Fe-based infiltrated layer was investigated. The results show that a certain extent oxidation happens on the surface of infiltrated layer when thermal cycling times are less than 20, and no micro-cracks are observed. While micro-cracks appeared at the interface between the infiltrated layer and the substrate and on the surface of the infiltrated layer when the thermal cycling times are beyond 60. The thicker the infiltrated layer, the earlier the time of micro-cracks appearing in different extent.