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Outline
To improve the operational performance and service life of oil‑free compressors，a study on the friction and wear characteristics of the contact pair between piston rings and cylinder inner walls was conducted.Cylinder surfaces were coated with Teflon，SiC，and DLC，respectively，and filled PTFE was selected as the piston ring material for sliding friction and wear tests.The results show that the friction coefficient time series curve of the friction pair corresponding to the DLC‑coated cylinder is the most stable，with the lowest friction factor.The surface morphology of the DLC coating is favorable，and the wear rate of the piston ring is the lowest.The average friction coefficient of the friction pair corresponding to the Teflon coating is the lowest （0.074 6），but due to poor adhesion between the coating and the aluminum alloy substrate，wear is relatively severe.Both SiC and DLC coatings exhibit good adhesion to the substrate.The wear mechanism of all friction pairs is predominantly adhesive wear，with PTFE transfer films of varying morphologies formed on the surface of the counterpart during friction.Under room temperature （25 ℃） conditions，the transfer films exhibit a flaky structure，with the most complete transfer film observed on the surface of the DLC‑coated cylinder.This indicates that the DLC coating is a relatively ideal optimization solution for cylinder surfaces.The study provides a theoretical basis for the optimized design of oil‑free compressors.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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