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首页> 外文会议>2003 International Thermal Spray Conference Vol.2; May 5-8, 2003; Orlando, Florida, USA >Wear Resistance of Nanostructured Thermal Barrier Coatings
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Wear Resistance of Nanostructured Thermal Barrier Coatings

机译：纳米结构热障涂层的耐磨性

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摘要

For more than two decades researchers have been working on thermal barrier coatings to improve the performance of diesel engines. However, these coatings have still not achieved widespread application in conventional diesel engines. The original motivation for this work was the improvement of fuel economy, since even a few percent improvement would result in huge savings in the transportation industries, but the coatings also effect exhaust emissions, component wear, and the sensitivity of engines to fuel quality. Wear at high temperatures, where conventional lubricants are not effective, is a serious problem in low heat rejection engines. Ceramic materials such as thermal barrier coatings in cylinder liners must have an acceptable wear rate and coefficient of friction. In this work we compare the wear behaviour of nanostructured thermal spray zirconia coatings with conventional zirconia coatings. First, process parameters that allowed the nanoparticles present in the feedstock powder to be retained in the coating were found. Then pin on disc wear tests of the two types of coatings were carried out at room temperature. The coating containing retained nanoparticles exhibited a lower coefficient of friction and less wear loss under discontinuous testing than the conventional coating.
机译：二十多年来，研究人员一直在研究隔热涂层，以改善柴油发动机的性能。然而，这些涂料仍未在常规柴油发动机中获得广泛应用。这项工作的最初动机是提高燃油经济性，因为即使提高百分之几也可以节省运输行业的成本，但是涂层也会影响废气排放，部件磨损以及发动机对燃油质量的敏感性。在低排热发动机中，在常规润滑剂无效的高温下磨损是一个严重的问题。陶瓷材料（例如气缸套中的隔热涂层）必须具有可接受的磨损率和摩擦系数。在这项工作中，我们将纳米结构热喷涂氧化锆涂层与常规氧化锆涂层的磨损行为进行了比较。首先，找到允许存在于原料粉末中的纳米颗粒保留在涂层中的工艺参数。然后在室温下对两种类型的涂层进行销钉磨损测试。与常规涂层相比，在连续测试下，含有保留的纳米颗粒的涂层表现出更低的摩擦系数和更少的磨损损失。

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