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This paper reports a study on the tribology of a diamond-like carbon (DLC) coating rubbed against stainless steel and brass in a hard water environment at 20, 50 and 80°C for water hydraulics applications. Hard water designed to simulate tap water in London containing 95mg/L Ca 2+ was used. DLC containing 30at% hydrogen was deposited on AISI 630 stainless steel using an unbalanced magnetron...
The effects of water environment on tribological properties of DLC against stainless steel were studied for development of the hydraulic pumps, valves and cylinders based on metal. A ball-on-disk tribotester was developed for detailed examination of water environment, such as temperature (20–80°C), dissolved oxygen (0.01–8ppm), water pressure (0.1–20MPa) and dissolved ions. DLC was deposited on the...
The wear characteristics of small (49mm diameter) coal logs (i.e. compacted coal cylinders) having an approximate length of 76mm were tested in a steel pipe in the laboratory. For each individual test, three identical coal logs were compacted from the same batch of materials under the same compaction conditions. Six factors that affect coal log wear were varied in the tests, one at a time, to assess...
To determine whether diamond-like carbon (DLC) films could be applied as a kind of solid lubricant coating at high temperatures, the friction properties and wear ability of DLC films in sliding against alumina at elevated temperatures up to 400 o C were investigated. We used Raman spectroscopy to determine the chemical and structural changes of DLC films, a scratch tester to investigate the...
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