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为了提高钛合金微弧氧化膜的耐磨性能,同时降低其摩擦系数,在硅酸钠-六偏磷酸钠-钨酸钠电解液中添加了1.5 g/L六方氮化硼(h BN)微粒,采用WHD-30微弧氧化电源直流脉冲模式在TC4钛合金表面制备了微弧氧化h BN复合膜。利用SEM,XRD,三维立体显微仪对复合膜的表面、截面微观形貌和结构进行了分析,研究了其在室温下的摩擦磨损性能。结果表明:在微弧氧化h BN复合膜的表层弥散有h BN颗粒,膜的表面只有少量的微孔;膜中具有金红石及锐钛矿Ti O2、Al2Ti O5和h BN,包含一些非晶态的P,Si,W化合物;在4 N载荷下干摩擦,微弧氧化h BN复合膜的摩擦系数为0.05,比磨损率为0.94 mm-6/(N·m),只发生了轻微的黏着磨损,几乎未发生磨粒磨损,起到了自润滑的作用;本法制备的复合膜既提高了TC4钛合金的耐磨性能,同时又减小了其摩擦系数。
In order to improve the wear resistance of the micro-arc oxidation film of titanium alloy and reduce its friction coefficient, 1.5 g / L hexagonal boron nitride (h BN) particles were added into the sodium silicate-sodium hexametaphosphate-tungstate electrolyte , Micro-arc oxidation h BN composite film was prepared on the surface of TC4 titanium alloy by WHD-30 micro-arc oxidation power DC pulse mode. The surface, cross-section morphology and microstructure of the composite membrane were analyzed by SEM, XRD and 3D stereo microscope. The friction and wear properties of the composite membrane at room temperature were studied. The results show that h BN particles are dispersed on the surface of the micro-arc oxidation h BN composite film, and the surface of the film has only a few micropores. The film contains rutile and anatase Ti O2, Al2Ti O5 and h BN, including some amorphous Of P, Si, W compounds. The friction coefficient of the micro-arc oxidation hBN composite membrane was 0.05 at 4 N load, and the specific wear rate was 0.94 mm-6 / (N · m) Wear, almost no abrasive wear, play a role in self-lubricating; The composite membrane prepared by this method not only improves the wear resistance of TC4 titanium alloy, while reducing the friction coefficient.