Preparation of Diamond like Carbon Films using Nanopulse Generator Employing SI Thyrister

Abstract

Diamond-like Carbon (DLC) films show high hardness, high electric resistivity, and the self-lubricant characteristic, and many applications and synthesis methods were reported. Pulse plasma Chemical vapor deposition (CVD) method is one of the synthesis methods suitable for DLC films on complicated form work, such as molding and extruding die. Ordinary, microsecond order pulse is used in this method. This paper describes the development of the synthesis method using nanosecond order pulse plasma CVD to DLC films. To realize this process, a static induction (SI) thyristor with an Inductive Energy Storage (IES) circuit was used. Compared with microsecond, nanosecond order pulse plasma CVD method shows the characteristics of the high electron temperature and the exponential relationship between pulse frequency and growth rate. The characteristics of the thus-obtained DLC films show two broad peaks of the disordered band at 1360 cm-1 and the graphitic band at 1580 cm-1 by Raman spectroscopy and hardness of 16.0 GPa and elastic modulus of 170 GPa.