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>Investigation of W-DLC Coated Gears Scuffing Performance in Dip-Lubricated System under Conditions of Reduced Oil Immersion Depth
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Investigation of W-DLC Coated Gears Scuffing Performance in Dip-Lubricated System under Conditions of Reduced Oil Immersion Depth
Increasing gear performance through applying a thin film coating on gear tooth flanks is attracting considerably attention. Several different gear tests show an increase in carrying load capacity or prolonged lifetime with tungsten-carbide doped DLC (W-DLC) coated gears. However, the lubricants used have been base oils or commercially available oil formulations that were primarily developed to interact with ferrous materials. Coated gear performance is likely to be further improved with a lubricant specially customized for W-DLC coated surface. In the present study, the modified scuffing tests on FZG test rig with W-DLC coated spur gears were carried out. Tests were performed in severe lubricating conditions at reduced oil level corresponding to the immersion depth of three modulus of the gear. Special oil blend, based on poly alpha-olefin was used for lubrication. Adapted oil formulation of ISO VG 32 viscosity grade was identified in the previous investigation where a series of tests on the reciprocating test rig were conducted to select an oil formulation that exhibits high wear resistance in self mated W-DLC coated contact. Significant increase in scuffing load capacity is found with W-DLC coated gears in relation to uncoated gears. Wear particles from the test with coated gears are smaller in length than particles from the test with uncoated test gears at the same load level. Evolution of oil temperature measured at the end of each scuffing load stage is remarkably similar for steel and coated gears.
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