Composite coatings manufactured by cold spray

摩擦学和表面工程是寻求在摩擦和耐磨性很重要的应用中提高材料性能的学科。这些都是基本的工程设计问题，如果得到解决，可以延长工业系统部件的使用寿命，并通过适当地减轻摩擦力来降低能源消耗。在材料表面涂覆一层涂层是提高耐磨性和控制摩擦的一种非常常见的策略。工业需要从表面工程师和摩擦学家那里获得具有良好特性的涂层，这些涂层是通过工艺制成的，有可能进行“临时”更换和修复技术。这对于维持具有成本效益和良好表现的表面工程选项的供应链非常重要。这项提议寻求进一步发展被称为冷喷涂的涂层技术，以便能够制造出具有耐磨或自润滑性能的复合涂层。目前，冷喷涂主要用于纯金属涂层，因为该工艺的性质是材料必须是可变形的才能有效地喷涂。我们的项目将把金属和非金属粉末结合在一起，通过一种新的独立的、共同喂入冷喷枪的粉末。这将克服其他研究人员在粉末预混合方面遇到的困难。利用这项新技术，我们将研究两个重要的涂层系统，一个是用于抗冲蚀磨损的涂层系统，另一个是用于金属系统的自润滑涂层系统。这两种涂层系统都将得到很好的表征和开发，从而使工业可以考虑将其用于表面工程应用。除了用冷喷涂制备新的复合涂层外，还将把这里喷涂的材料的实验数据与计算模型结合起来模拟冷喷涂过程。其结果将是一个加工窗口工具，它将有助于预测任意两个粉末系统的最佳喷涂条件。因此，我们将在项目结束时做好充分准备，继续研究冷喷涂复合涂层，用于加拿大其他行业，如航空航天、汽车、管道、林业和采矿。

Tribology and surface engineering are disciplines that seek to enhance the properties of materials for applications where friction and wear resistance are important. These are fundamental engineering design concerns that, when addressed, can increase the lifetime of components for industrial systems, and reduce energy consumption through proper mitigation of frictional forces. Placing a coating on the surface of a material is a very common strategy to enhance wear resistance and control friction. What industry needs from surface engineers and tribologists are well characterized coatings made by processes with the potential for making 'drop-in' replacements and repair technologies. This is important to maintain a supply chain of cost effective and well performing surface engineering options. This proposal seeks to further develop the coating technology known as cold spray such that composite coatings can be fabricated that have either wear resistant or self lubricating properties. Currently, cold spray is most used for pure metallic coatings, due the nature of the process where materials must be deformable to be effectively sprayed. Our project will combine metallic and non-metallic powders through a new independent, co-feeding of the powders to the cold spray 'gun.' This will overcome difficulties other researchers have encountered with pre-mixing of powders. With this new technique, we will investigate two important coating systems, one for resistance to erosive wear and the other for self lubrication of metallic systems. Both coating systems will be well characterized and developed to the point where industry can consider them for surface engineering applications. Alongside the fabrication of new composite coatings with cold spray, experimental data on the materials sprayed here will be combined with computational models to simulate the cold spray process. The outcome will be a processing window tool that will help to predict optimal spray conditions for any two powder systems. As such, we will be well prepared at the end of the project to continue research on composite coatings made by cold spray for other applications in Canadian industries, such as aerospace, automotive, pipeline, forestry and mining.