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采用超声辅助换向脉冲喷射电沉积技术在45钢表面制备了Co–Cr_3C_2复合镀层。研究了超声功率和超声间歇时间对Co–Cr_3C_2复合镀层的Cr_3C_2颗粒质量分数、微观形貌、显微硬度、表面粗糙度和耐磨性的影响。超声波的加载极大地改善了复合镀层的组织结构和性能。超声功率为36 W、超声间歇为8 s时,Co–Cr_3C_2复合镀层的表面粗糙度最低,均匀致密,鲜有孔隙,Cr_3C_2颗粒在镀层中的质量分数达到26.85%并均匀地分布在钴基质中,其显微硬度高达695 HV,摩擦因数仅为0.12。该复合镀层在800℃时仍有很好的热稳定性。当热处理温度高于500℃时,复合镀层的显微硬度明显高于硬铬镀层。
The Co-Cr_3C_2 composite coating was prepared on the surface of 45 steel by ultrasonic assisted reversing pulse jet electrodeposition. The effects of ultrasonic power and ultrasonic intermittent time on the mass fraction of Cr_3C_2, morphology, microhardness, surface roughness and wear resistance of Co-Cr_3C_2 composite coatings were studied. Ultrasonic loading greatly improves the microstructure and properties of the composite coating. When the ultrasonic power is 36 W and ultrasonic intermittent is 8 s, the surface roughness of Co-Cr_3C_2 composite coating is the lowest, uniform and compact, with few pores. The mass fraction of Cr_3C_2 particles in the coating reaches 26.85% and is uniformly distributed in the cobalt matrix , The microhardness of up to 695 HV, friction coefficient of only 0.12. The composite coating at 800 ℃ still has good thermal stability. When the heat treatment temperature is higher than 500 ℃, the microhardness of the composite coating is obviously higher than the hard chromium coating.