스크롤 압축기 저널 베어링 부싱의 트라이볼로지적 특성 향상 연구 = Study on the Role of Diamond-Like Carbon Coatings in EnhancingScroll Compressor Journal-Bearing Bushings Tribological Performance

다국어 초록 (Multilingual Abstract)

In response to the growing demand for enhanced energy efficiency and system reliability in refrigeration and air conditioning systems, the tribological performance of journal-bearing bushings in scroll compressors has become a critical focus area. Inadequate lubrication leads to repeated sliding contacts between the crankshaft and bushing, causing accelerated wear and reduced mechanical efficiency. This is the main cause of failure, accounting for the highest percentage of actual field failure cases. This study evaluates diamond-like carbon (DLC) coatings on aluminum alloy and PTFE substrates to enhance friction and wear characteristics in severe dry contact environments. We perform plate-on-cylinder type friction tests under various loading and cycling conditions to simulate realistic compressor operating scenarios. Results indicate that DLC coatings significantly increase surface hardness and decrease surface roughness, significantly lowering friction coefficients and wear rates. Moreover, the combination of DLC coatings with PTFE substrates exhibits the most stable frictional behavior and superior wear resistance throughout the tests. This study confirms that DLC coatings protect substrates from severe wear and ensure long-term operational stability under dry conditions. These findings suggest that DLC surface treatments effectively improve the durability and mechanical efficiency of scroll compressor journal bearings, contributing to extended system life and enhanced overall performance in practical applications.