为了改善钻井泥浆泵缸套表面综合性能, 采用超声-电沉积方法在40Cr钢缸套试件表面制备Ni-SiC纳米镀层.利用原子力显微镜、高分辨率透射电子显微镜、显微维氏硬度计、摩擦磨损试验机和涂层附着力划痕仪对Ni-SiC纳米镀层的表面形貌和性能进行测试, 研究超声场强度对Ni-SiC纳米镀层性能的影响.结果表明:随着超声场强度的增加, Ni-SiC纳米镀层的晶粒逐渐细化, 表面粗糙度逐渐降低, 镀层的孔隙直径逐渐减小;当超声场强度为180 W时, Ni-SiC纳米镀层表面晶粒的尺寸最小, 其表面粗糙度Ra和摩擦因数均达到最小值34. 687 nm和0. 236, 纳米镀层的界面结合力达到最大值63. 22 N, 其摩擦因数平均值达到最小值0. 236.%In order to improve the surface comprehensive properties of the cylinder liner in drilling mud pumps, Ni-SiC nanocoatings were prepared by ultrasonic electrodeposition method on the surface of 40 Cr steel sample. The surface morphologies and properties of the coatings were measured by using atomic force microscope (AFM), high resolution transmission electron microscope (HRTEM), micro-vickers hardness tester, friction and wear tester and coating adhesion scratch instrument. And the effect of ultrasonic strength on the properties of Ni-SiC nanocoatings was also studied. The results showed that the grain size of Ni-SiC nanocoating was gradually refined, the surface roughness was gradually decreased, and the pore diameter of the coating also decreased, when the ultrasonic intensity increased. When the ultrasonic field intensity was 180 W, the surface grain size of Ni-SiC nanocoating was the smallest, and its surface roughness Ra and friction coefficient reached the minimum value of 34. 687 nm and 0. 236, respectively, and the interface adhesion of the of nanocoating was 63. 22 N, and the average friction coefficient reached the minimum value of 0. 236.
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