EAPSI: Incorporation of Nano-Sized Diamonds in Advanced Composite Coatings for Reduction of Friction and Wear

这项拟议的研究将试图制造与商业使用的材料相比，具有更低摩擦和磨损的先进涂层。碳化钨/钴涂层目前广泛应用于航空航天、汽车和能源等行业。在这些材料中加入纳米金刚石以形成先进的复合涂层被认为是为了提高耐磨性和减少摩擦。减少摩擦对提高能源效率至关重要；例如，据估计，汽车中33%的燃料能源消耗在克服摩擦损失上。这项拟议的研究将在韩国延世大学金大恩博士的实验室进行。由Kim博士领导的纳米磨损中心拥有世界级的设施，可以在多种环境下评估各种材料的摩擦和磨损性能。纳米钻石的使用预计将解决碳化钨/钴涂层中的几个关键问题。这些涂层的磨损性能取决于实现强度(例如硬度)和延展性(例如韧性)的最佳组合。这些性能通常是相互排斥的，因为它们依赖于通常是硬而脆的或软而韧的成分相。钻石的使用预计将增加硬度，同时通过抑制脆性相的形成来提供增韧。在用于制造涂层的高温处理过程中，这些钻石预计将作为碳的来源，这将抑制碳化钨脱碳为脆性相。金刚石还具有良好的导热性能，有利于高温环境下的耐磨性能。将进行磨损试验，以评估在模拟载荷条件下的性能，并阐明纳米钻石对材料性能的影响。

The proposed research will attempt to fabricate advanced coatings with reduced friction and wear, as compared to commercially used materials. Tungsten carbide / cobalt coatings are used today in a wide range of sectors including the aerospace, automotive, and energy industries. The incorporation of nano sized diamonds into these materials to form advanced composite coatings is envisioned to improve the wear resistance and reduce friction. The reduction of friction is critically important to improving energy efficiency; for example, it is estimated that 33% of fuel energy in automobiles is consumed in overcoming frictional losses. The proposed research will be conducted at Yonsei University in South Korea in the laboratory of Dr. Dae Eun Kim. The Center for Nano-Wear directed by Dr. Kim has world class facilities for accessing the friction and wear performance of a variety of materials under several types of environments. The use of nanodiamonds is expected to address several key concerns in tungsten carbide / cobalt coatings. The wear performance of these coatings is dependent on achieving an optimal combination of strength (e.g. hardness) and ductility (e.g. toughness). These properties are often mutually exclusive as they are dependent on constituent phases which are typically either hard and brittle or soft and tough. The use of diamonds is expected to increase hardness while simultaneously providing toughening by inhibiting the formation of brittle phases. The diamonds are expected to act as a source of carbon during the high temperature processing used to make the coatings, which will inhibit the decarburization of tungsten carbide into brittle phases. Diamond also has excellent thermal conductivity which would be beneficial to wear performance in high temperature environments. Wear tests will be conducted to evaluate the performance under simulated loading conditions and also to elucidate the effects of the nanodiamonds on the material properties.