The DLC thin-coated film is composed of carbon (C), the same as diamond and graphite. The structure of DLC is amorphous.
The bonding mode between the carbon atoms of DLC consists of both a diamond structure and a graphite one; the carbon atoms are partially connected with hydrogen atoms.
Because of such a hydrogen bond, DLC has an amorphous structure, without having the crystal structure made up of a regular combination in the order of long distance.
The properties of DLC are similar to those of diamond, so DLC is called Diamond-Like Carbon.
DLC has a very low coefficient of friction and high wear resistibility; DLC is used prosperously in recent years in the manufacturing field. At present, the DLC is deposited by high frequency plasma CVD method.
Glow discharge is generated by adding high frequency electric power between two electrodes, which face each other. The DLC thin film is accumulated on the surface of the substrate, which is settled on the cathode electrode by decomposing a material gas such as CH4 (methane) which, is introduced between the electrodes by utilizing glow discharge,
The Characteristics of DLC:
1. High hardness, Low coefficient of friction. Excellent abrasion resistance
2. Very smooth surface Low attacking nature
3. Chemically inactive. Excellent corrosion resistance
4. Very little wear powder (under frictional movement). Excellent preventative nature for emitting dust and contamination