钛合金表面液相电解类金刚石碳膜的摩擦磨损性能

采用液相电解法在钛合金表面制备了类金刚石碳(DLC)膜,利用拉曼光谱仪和傅立叶红外光谱仪表征了DLC薄膜的结构,考察了其机械及摩擦磨损性能,并通过划痕试验测定了类金刚石碳膜与钛合金基体之间的临界剥离载荷.结果表明:所制备的类金刚石碳膜的摩擦系数较低,其摩擦系数随着载荷的增加而略有降低;抗磨性能则随着载荷的增加而变差;类金刚石碳膜与钛合金基体之间的临界剥离载荷为0.882N.

Friction and Wear Behavior of Diamond-Like-Carbon Film on Titanium Alloy Surface Prepared by Liquid-Deposition

Diamond-like carbon (DLC) film was prepared on the surface of Ti alloy by liquid electrolysis. The structure of the DLC film was analyzed using Raman spectrometry and Fourier transformation infrared spectrometry. The friction and wear behavior of the DLC film was evaluated using a ball-on-disc friction and wear tester. The adhesion strength of the DLC film to the Ti-alloy substrate was also determined using the ball-on-disc test rig in a scratch mode. The Worn surface morphologies of the DLC film at different loads were observed using a scanning electron microscope. It was found that the resulting DLC film was composed of sp~3-C and sp~2-C and contained hydrogen. It had good friction-reducing and antiwear abilities, i.e., almost no wear was detected at a relatively small load and the friction coefficient kept almost unchanged during the whole sliding stage at a small load. Moreover, the DLC coating had a critical load as high as 0.882 N, indicating that it could be suitable to the surface modification of the Ti alloy used for artificial joints implantation.