钛合金微弧氧化一步制备含石墨的减摩涂层

One-step preparation of graphite-containing antifriction coating on Ti alloy by plasma electrolytic oxidation

为了进一步提高钛合金表面微弧氧化陶瓷涂层的摩擦磨损性能,在石墨分散的Na2CO3-Na2SiO3-KOH电解液溶液中一步制备了含自润滑微粒的微弧氧化复合涂层.利用X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)和扫描电子显微镜(SEM)研究了未添加和添加石墨微弧氧化涂层的相组成和微结构,采用往复式球-盘试验机评价了两种涂层的摩擦学性能.结果表明:加入到电解液中的石墨在微弧氧化过程中进入到涂层中,从而得到含有固体润滑微粒的复合涂层;在干摩擦条件下,含石墨的微弧氧化涂层相比于不含石墨的涂层具有更小的摩擦系数.

One-step plasma electrolytic oxidation（PEO） process in a graphite-dispersed Na2CO3-Na2SiO3-KOH electrolyte was used to prepare a graphite-containing oxide composite coating on titanium alloy to improve the tribological property of the coating.The composition and microstructure of the oxide coatings produced in the Na2CO3-Na2SiO3-KOH electrolytes with and without addition of graphite particles were analyzed by X-ray diffractometer（XRD）,X-ray photoelectron spectroscope（XPS） and scanning electric microscope（SEM）.The tribological properties of the oxide coatings were evaluated using a reciprocating ball-on-disk tribometer.Results show that the graphite-containing oxide composite coating can be successfully produced on titanium alloy in the graphite-dispersed electrolyte using PEO process.The graphite-containing oxide coating has lower friction coefficient than the oxide coating without graphite under dry sliding condition.