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选用3Cr2W8V为基体材料,对其进行钴磷化学镀,研究了该镀层在680～20℃热循环试验中组织和性能的变化。结果表明,Co-P合金镀层经过一定的循环次数后析出Co2P及CoP2等磷化物;粗大的磷化物与镀层的相界面为热裂纹形成及优先扩展的区域;镀层的表面硬度随热循环次数的增多而下降;镀层的厚度影响材料的热疲劳寿命;镀层随热循环次数的增多而破坏加剧,最终与基体分离,使基体受损。
3Cr2W8V was chosen as the matrix material for electroless plating of cobalt and phosphorus. The microstructure and properties of the coating during the thermal cycling test at 680 ~ 20 ℃ were studied. The results show that Co-P alloy coating precipitates Co2P, CoP2 and other phosphides after a certain number of cycles. The interface between the coarse phosphide and the coating is in the area of hot crack formation and preferential expansion. The hardness of the coating increases with the number of thermal cycles Increase and decline; the thickness of the coating affect the thermal fatigue life of the material; coating with the increase in the number of thermal cycles and the damage worse, and ultimately separated from the substrate, so that the matrix damage.