Abstract
The lubricated wear of a steel couple in which one member is coated with W-DLC is contrasted with that found when both surfaces are coated. The protrusions on the uncoated steel surface are sufficiently hard that they penetrate the W-DLC coating on the mating surface, forming plastic grooves that align along the translation direction. The contact severity exceeds the cracking threshold for the W-DLC coating. The lateral cracks create spalls that remove material at a high rate. The median cracks adversely affect the fatigue life, since some penetrate into the steel substrate. The implication is that a W-DLC coating on only one of the mating surfaces does not enhance durability: both surfaces must be coated to realize the durability benefit. The observed spalling and cracking have been rationalized using established indentation results derived for monolithic brittle solids.
Original language | English (US) |
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Pages (from-to) | 306-313 |
Number of pages | 8 |
Journal | Surface and Coatings Technology |
Volume | 179 |
Issue number | 2-3 |
DOIs | |
State | Published - Feb 23 2004 |
All Science Journal Classification (ASJC) codes
- General Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
Keywords
- Carbon alloy coatings
- Diamond-like carbon (DLC)
- FIB
- Friction/lubricity
- Surface
- Wear