Functional Ceramic Coatings Deposited by Solution Precurser Plasma Spray

溶液前驱体等离子喷涂（SPPS）是一种能够通过将对应于所需涂层成分的前驱体盐溶液注入直流电弧等离子体中来沉积几乎任何成分的涂层的工艺。从溶液中快速形成固体导致极细的微晶尺寸，通常在20-30 nm的数量级。涂层结构的范围可以从极高的孔隙率到几乎完全致密。然而，为了能够可靠地存款具有所需结构、组成和性能的涂层，在理解和控制该工艺方面存在许多复杂现象和重大挑战。**拟议的研究计划将扩展和扩大我们最近在SPPS的工作。有两个主要目标。一个是进一步开发和展示该工艺的潜力，以生产用于特定应用的独特的高性能沉积物。特别感兴趣的是功能陶瓷涂层作为超级电容器和锂离子电池中的电极的电化学性能。第二个主要目标是通过将涂层微观结构的实验、诊断和表征与等离子体中液滴的蒸发、破碎和碰撞、液滴中产物相的沉淀、加热、熔化和颗粒对基底的冲击的数值模拟相结合，更好地理解该过程中所涉及的现象。

Solution precursor plasma spraying (SPPS) is a process capable of depositing coatings of almost anycomposition by injecting solutions of precursor salts corresponding to the desired coating composition into a DC-arc plasma. The rapid formation of the solid from the solution results in extremely fine crystallite sizes, typically on the order of 20-30 nm. Coating structures can range from extremely high porosities to nearly completely dense. However, a number of complex phenomena are involved and significant challenges exist in understanding and controlling the process in order to be able to reliably deposit coatings of the desired structure, composition, and properties.******The proposed research programme will extend and expand our recent work in SPPS. There are two major objectives. One is to further develop and demonstrate the potential of this process to produce unique, high performance deposits of for specific applications. Of particular interest is the electrochemical performance of functional ceramic coatings as electrodes in ultra-capacitors and Li-ion batteries. The second major objective is to develop a better understanding of the phenomena involved in the process through coupling of experiments, diagnostics, and characterization of coating microstructures with numerical modelling of the evaporation, break-up and collision of droplets in the plasma, the precipitation of product phases in the droplets, the heating, melting, and impact of the particles on the substrate.**