轮胎模具DLC涂层应用的可行性分析

Feasibility Analysis of Diamond-Like Carbon Coating Applied for Tire Mold

为了探究类金刚石(DLC)涂层在轮胎模具上应用的可行性,以35钢为基体,采用等离子辅助增强化学气相沉积(PECVD)的方法分别制备出了含氢类金刚石(DLC)涂层和氟化类金刚石(F-DLC)涂层,并对涂层表面形貌、Raman光谱、表面粗糙度、结合强度、力学性能、摩擦磨损性能进行了研究分析。结果表明:所制备的含氢DLC涂层和F-DLC涂层表面粗糙度分别为53.2 nm和54.6 nm,表面光滑,致密性好;涂层接触角分别为81.2°和98.5°,符合脱模要求;纳米硬度分别为23.9 GPa和14.3 GPa,弹性模量分别为177.0 GPa和118.5 GPa,拥有较高的结合强度和力学性能;在140℃下进行摩擦磨损试验时的摩擦系数分别为0.4487和0.2631,磨损不明显,具有良好的抗磨减摩特性。采用该工艺方法来制备轮胎模具DLC涂层具有应用的可行性。

In order to investigate the feasibility of diamond-like carbon(DLC)coating applied for tire mold,hydrogen-containing DLC coatings and fluorine-containing DLC coatings(F-DLC)coatings were prepared on the substrate of 35 steel by plasma enhanced chemical vapor deposition(PECVD).The surface morphology,Raman spectrum,surface roughness,bonding strength,mechanical properties and friction and wear properties of the coatings were studied and analyzed.Results showed that the surface roughnesses of the hydrogen-containing DLC coating and F-DLC coating were 53.2 nm and 54.6 nm,which indicated the coating had smooth surface and good compactness.The contact angles of the coatings were 81.2°and 98.5°,meeting the demoulding requirements.In addition,the nano-hardnesses were 23.9 GPa and 14.3 GPa,and the elastic moduluses were 177.0 GPa and 118.5 GPa,indicating that coatings had high bonding strength and mechanical properties.The friction coefficients of the coatings were 0.4487 and 0.2631 at 140℃,and the wear phenomenon was not obvious,proving that coatings had good wear resistance and friction reduction characteristics.Therefore,it was feasible to apply the preparation of DLC coating to tire mold by the process described in this paper.