钛合金表面微弧氧化膜层磨损性能研究

采用微弧氧化技术,以硅酸钠、磷酸钠溶液为电解液,在TC4钛合金表面制备出高硬度、高耐磨的微弧氧化膜层。用扫描电镜观测了膜层的显微结构,用X射线衍射分析其相组成,并对膜层进行了耐磨损和摩擦学性能实验。结果表明,膜层由过渡层、致密层和疏松层3层组成。其相组成主相为Al2TiO5,其次为Al2SiO5,并含有少量无定型SiO2。膜层的维氏硬度为8470MPa,是基体硬度的2倍多。采用45#钢作对磨副,载荷为5kg,磨损时间20min条件下,膜层的失重为0.25mg,仅为基体的8%左右。

Wear Characteristic of Microarc Oxidation Coating on Titanium Alloy

Ceramic coatings were fabricated on the surface of TC4 alloy by microarc oxidation method in silicate solution,which have high hardness and good wear resistance. The morphology,microstructure,wear and friction characteristic were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the coating is composed of Al2TiO5 and Al2SiO5. The harness of the coating is 847 Hv. Tribotest at 5 kg load,20 minutes show that the friction coefficient is 0.132 which is a little more than that of matrix,and the loss of weight is only 0.25 mg which decreases a order of magnitude than that of matrix.