Tribological characteristics of DLC-coated alumina at high temperatures
Tribological characteristics of DLC-coated alumina at high temperatures
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DOI：
10.1115/1.2345395
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发表时间：
2006-10-01
影响因子：
2.5
通讯作者：
Wei, R.
中科院分区：
文献类型：
--
作者：
Lee, K. Y.;Wei, R.
陶瓷密封广泛应用于腐蚀性、高温、高负荷等恶劣环境中，尤其是汽车水泵的热化学水基极端环境中。目前，聚合物材料被用作氧化铝陶瓷密封件的配对部件，以减少陶瓷对陶瓷的磨损。因此，在服务期间，从水泵中经常观察到泄漏。因此，需要使用表面改性技术（例如薄膜涂覆工艺）来改善陶瓷密封件的表面性质，以满足在那些极端环境中更稳定、更耐久和更低摩擦系数的日益增长的需求。为了应对这些挑战，我们使用PIID（等离子体浸没离子沉积）技术在氧化铝上应用了DLC（类金刚石碳）涂层，该技术旨在用于密封应用。DLC涂层试样在从室温到400 ℃的广泛温度条件下使用高温销盘式摩擦试验机进行测试。然后，使用具有EDS的SEM对磨损测试试样进行分析以表征磨损表面。研究了DLC涂层表面在磨损试验前后的形貌变化。在某些沉积条件下，DLC在高达400摄氏度的温度下表现非常好。然而在其他条件下，DLC灾难性地失败了。在本文中，我们将提出的DLC涂层氧化铝的摩擦磨损特性。最后，我们将讨论DLC涂层的失效模式。
Ceramic seals are widely used in many severe applications such as in corrosive, high temperature and highly loaded situations especially in hot chemical water-based extreme environments for automobile water pumps. Presently, polymeric materials are used as the counter part for alumina ceramic seals to reduce the ceramic-to-ceramic wear As a result, leaks are very commonly observed from water pump during services. Consequently, it is needed to improve the surface properties of the ceramic seals using a surface modification technique such as a thin film coating process to meet the increasing demand of more stability, more durability, and lower friction of coefficient in those extreme environments. To meet these challenges, we have applied DLC (diamond-like carbon) coatings on alumina using a PIID (plasma immersion ion deposition) technique intended for seal applications. The DLC-coated specimens were tested under a wide range of temperature conditions, from room temperature up to 400 degrees C, using a high temperature pin-on-disk tribo-tester After that, the wear-tested specimens were analyzed using SEM with EDS to characterize the worn surfaces. Morphological changes of the DLC coated surfaces before and after the wear tests were studied. Under certain deposition conditions DLC performed very well up to 400 degrees C. However under other conditions, DLC failed catastrophically. In this paper we will present the friction and wear characteristics of the DLC-coated alumina. Finally, we will discuss the failure mode of DLC coatings.