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采用脉冲直流微弧氧化方法在钛合金钻杆表面制备了不同氧化时间下的TiO_2陶瓷膜层,用扫描电镜、X射线衍射仪、显微硬度计、球盘摩擦试验机及电化学工作站等分析了膜层的形貌、结构、组成以及膜层的硬度、摩擦磨损性能和耐蚀性。结果表明,随着氧化时间的延长,膜层的厚度增加,但膜层的硬度、耐磨性和耐腐蚀性先增加后降低。经不同氧化时间处理后,膜层的相结构主要由金红石型TiO_2和锐钛矿型TiO_2组成,此外还含有少量的Al2TiO5晶体和SiO_2非晶态。微观形貌分析表明,随着氧化时间延长,膜层表面粗糙度延长。在本实验条件下,当氧化时间为40min时,微弧氧化膜层的综合性能较好。
The TiO_2 ceramic coatings with different oxidation time were prepared by pulsed direct current micro-arc oxidation on the surface of the titanium alloy drill rod. The morphology of the coating was characterized by scanning electron microscopy, X-ray diffraction, microhardness tester, ball and disk friction tester and electrochemical workstation The film morphology, structure, composition and the film hardness, friction and wear properties and corrosion resistance. The results show that with the extension of the oxidation time, the thickness of the film increases, but the hardness, wear resistance and corrosion resistance of the film first increase and then decrease. After treated with different oxidation time, the phase structure of the film mainly consists of rutile TiO 2 and anatase TiO 2. In addition, it contains a small amount of Al 2 TiO 5 crystals and SiO 2 amorphous. Micro-morphology analysis shows that with the oxidation time, the surface roughness of the coating prolongs. Under the experimental conditions, when the oxidation time is 40min, the comprehensive performance of MAO coatings is better.