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为进一步提高Ni-W-Al2O3复合镀层的摩擦磨损性能,本文采用十二烷基硫酸钠和1.4丁炔二醇两种表面活性剂在不同场下分别对Al2O3颗粒进行不同情形化学分散,并通过直流电沉积技术在45#钢基体上成功制备了Ni-W-Al2O3复合镀层,运用显微维氏硬度计、摩擦磨损实验机、三维表面轮廓仪、扫描电镜(SEM)、能谱仪(EDS)等研究不同Al2O3分散方式下所得复合镀层的表面形貌、磨损失重、磨损率与磨痕形貌,并对比其摩擦磨损性能。结果表明,用1.4丁炔二醇分散所得复合镀层表现出优良的磨损性能,耐磨性也最好;与相同情况下Al2O3未分散所得镀层相比,其耐磨性提高近4倍,磨损率最小为2.51×10-6mm3·(N·m)-1。稳恒磁场下用1.4丁炔二醇分散所得镀层磨损率较Al2O3未分散所得镀层磨损率降低了24%,超声场下磨损率则相对降低了34.8%。显微组织分析得出:稳恒磁场下用1.4丁炔二醇分散Al2O3所得复合镀层表面形貌均匀致密,针孔、缺陷明显减少,超声场下镀层表面形貌致密度加大,针孔、缺陷消失,但晶粒长大较明显。
In order to further improve the friction and wear properties of Ni-W-Al2O3 composite coatings, two surfactants, sodium dodecyl sulfate and 1,4-butynediol, were used to chemically disperse Al2O3 particles in different fields under different fields and pass The Ni-W-Al2O3 composite coating was successfully prepared on the 45 # steel substrate by DC deposition technique. The micro-Vickers hardness tester, friction and wear tester, 3D surface profilometer, SEM, EDS, The surface morphology, wear loss, wear rate and wear scar morphology of composite coatings obtained by different Al2O3 dispersion methods were studied and their friction and wear properties were compared. The results show that the composite coating with 1.4-butynediol dispersed exhibits excellent wear properties and wear resistance is also the best; compared with the same case of Al2O3 undispersed coating, the wear resistance increased by nearly 4 times the wear rate The minimum is 2.51 × 10 -6 mm 3 · (N · m) -1. The wear rate of the coatings obtained by the dispersion of 1.4 butynediol in the steady magnetic field was reduced by 24% compared with that of the undispersed Al2O3 coating and the wear rate was reduced by 34.8% in the ultrasonic field. Microstructure analysis shows that the surface morphology of the composite coating obtained with 1.4 butynediol dispersed Al2O3 under a steady magnetic field is uniform and compact, the pinholes and defects are obviously reduced, the surface morphology density of the coating is increased under the ultrasonic field, Defects disappear, but more obvious grain growth.