液相电化学法在不锈钢上沉积类金刚石薄膜

Diamond-like-carbon films prepared on stainless steel substrate by liquid-deposition

采用直流脉冲电源,以甲醇有机溶液作为碳源,通过电化学沉积法在不锈钢表面制备了类金刚石碳(DLC)薄膜。用扫描电镜和拉曼光谱分析了薄膜的形貌和结构,用MTS纳米压痕仪测试DLC薄膜的硬度和Young s模量,在CERT微摩擦系统上测试了薄膜的摩擦学性能。结果表明:电化学沉积含氢类金刚石碳薄膜的硬度较高(约7GPa),薄膜均匀、致密,表面粗糙度小;拉曼光谱在1332.51 cm-1处出现金刚石的特征峰;在室温干摩擦条件下,薄膜同WC钢球对摩时的摩擦系数随载荷增加而略微减小,抗磨性能则随着载荷的增加而变差,对摩时发生转移并形成转移膜,耐磨寿命缩短。

Diamond-like carbon （DLC） films were deposited on stainless steel substrate at atmospheric pressure and low temperature （60℃） by electrolysis in a methanol solution with the pulsed direct current power supply. The morphology and microstructure of the DLC films were analyzed by scanning electron microscopy （SEM） and Raman spectroscopy. The hardness and Young＇s modulus of the DLC films were determined using a nano indenter indentation system （MTS Systems Corporation）, and the friction and wear behavior of the films were evaluated on a CERT test system. The experimental results show that the hydrogenated diamond-like carbon films are smooth and compact. The hardness of the deposited films is up to 7GPa. Raman spectroscopy analysis confirms the presence of a strong diamond peak at 1332.51 cm^-1. At ambient conditions, the friction coefficient of DLC films against WC steel ball decreases, and the wear resistance becomes bad with increasing the load.