Polyoxymethylene (POM, polyacetal) is one of the most popular plastics for machine elements, especially in Japan. However, it is difficult to use it under severe operating conditions such as high speed and high contact pressure. Diamond‐like carbon (DLC) coatings were well known to be tribological and functional coatings. However, both POM and DLC coatings are difficult to adhere them each other. In the present paper, DLC coatings are deposited by plasma‐based ion implantation and deposition (PBIID) method on POM substrate, and validity of DLC coatings on POM was investigated through friction and mechanical tests. When gas pressure was 0.2 and 0.8 Pa, hardness and adhesion properties of DLC coating deposited under gas pressure of 0.5 Pa were lower compared with under 0.2 and 0.8 Pa. For preparing DLC coatings having hard and good adhesion properties, relatively thin substrate was suitable. A correlation between relative humidity in the laboratory and friction coefficient was confirmed while DLC coatings remain on the substrate.

中文翻译：

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基于等离子体的离子注入和沉积方法在聚甲醛上沉积的DLC涂层的力学和摩擦学性能

聚甲醛（POM，聚缩醛）是用于机械元件的最受欢迎的塑料之一，尤其是在日本。但是，很难在诸如高速和高接触压力的严酷操作条件下使用它。类金刚石碳（DLC）涂层是众所周知的摩擦学和功能涂层。但是，POM和DLC涂层都难以相互粘合。在本文中，通过基于等离子体的离子注入和沉积（PBIID）方法将DLC涂层沉积在POM基板上，并通过摩擦和力学测试研究了DLC涂层在POM上的有效性。当气压为0.2和0.8 Pa时，在气压为0.5 Pa的情况下沉积的DLC涂层的硬度和附着力比在0.2和0.8 Pa下更低。为了制备具有坚硬和良好粘附性能的DLC涂层，相对薄的基材是合适的。当DLC涂层保留在基材上时，实验室相对湿度与摩擦系数之间的关系得到了确认。