Patent ID: 11905586
Assignee: TOHKEN THERMO TECH CO., LTD
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 2:
3. A method for producing the low friction wear film according to claim 1, the method comprising:
as a chromium layer deposition step, depositing the chromium layer by causing inert gas ions to collide with a chromium target made of chromium placed in a vacuum chamber to cause chromium atoms sputtered from the chromium target to adhere to the surface of the metal substrate;
as a chromium-tungsten carbide gradient layer deposition step, depositing the chromium-tungsten carbide gradient layer by causing inert gas ions to collide with the chromium target and a tungsten carbide target made of tungsten carbide placed in the vacuum chamber to cause chromium atoms sputtered from the chromium target and tungsten carbide component sputtered from the tungsten carbide target to adhere to the surface of the chromium layer;
as a tungsten carbide uniform layer deposition step, depositing the tungsten carbide uniform layer by causing inert gas ions to collide with the tungsten carbide target placed in the vacuum chamber to cause the tungsten carbide component sputtered from the tungsten carbide target to adhere to the surface of the chromium-tungsten carbide gradient layer;
as a hydrocarbon ionization step, introducing a hydrocarbon gas into the vacuum chamber and ionizing the introduced hydrocarbon gas; and
depositing the diamond-like carbon layer by causing hydrocarbon ionized in the hydrocarbon ionization step to adhere to the surface of the tungsten carbide uniform layer,
wherein the hydrocarbon ionization step is started before the tungsten carbide uniform layer deposition step is carried out.