Abstract
In the present paper, strength of DLC film was evaluated by gear operating test rig using DLC deposited POM gear pair. DLC films are easily detached or broken by high contact pressure. So that these are not applied to gear tooth flanks or raceway of bearings. If DLC films can be applied to gear tooth flank and they work for a long time, applicable field of them become widespread. Ni plating, Cr/C gradient interlayer and DLC film deposited POM gears were prepared for operating tests with changing plating time (for changing thickness of Ni plating) and substrate bias voltage (for changing hardness of DLC film). Results of operating tests using DLC deposited POM gear pairs indicated usefulness for evaluation method of DLC film strength. From operating tests results, it was clear that large thickness of plating made DLC film strength higher. And much DLC film deposited -100V substrate bias voltage, which had high hardness, remained on tooth flank after gear operating test.
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