阴极微弧电沉积氧化锆-氧化钇陶瓷涂层的研究

In present study, a novel idea was proposed, that is, micro-arc can be induced at the cathode surface at special conditions, consenquently, compounds deposited on the cathode surface can be transformed to ceramic coatings by the energy of micro-arc. A new technique is invented that is cathodic micro-arc depoditing ceramic coatings. The key scientific problem in present study is the physical conditions for the cathodic micro-arc discharging. Two kinds of micro-zrc discharging phenomenon have been discovered: (a) micro-arc induced by preparing solid barrier films on the cathode surface; (b) micro-arc induced by formation of hydrogen gas film on the cathode surface. It was obtained that is the influence of preparing methods of barrier films, thickness and structure of the films, current wave shapes, voltage, solution types and concentrations, etc., on the happen of micro-arc discharging. It was discovered that is the relationship between the micro-arc discharging and the codition of formation of hydrogen gas film on the cathode surface. The rule and mechanism of cepositing ZrO2-Y2O3 coatings in acqueous solutions, acchohol solutions with Zr+4and Y+3 ions, Zr+4and Y+3 sol-gel, and nano ZrO2-Y2O3 paricles. Different kinds of ZrO2-Y2O3 coatings were prepared, with thicknees of several mm to several handrend mm, having a micro-pore structure or compact structure. The characteristics of ZrO2-Y2O3 coatings was evaluated. A cathodic micro-arc depositing device and a high voltage direct current pulse power were developed. The output parameters of the power were controlled by a computer, which make the depositing process auto-controlled. Therefore, a new way was opened to prepare ceramic coatings by present research work.

本项目提出一种通过阴极微弧放电获得陶瓷涂层的新技术。研究目的是获得阴极微弧放电发生的物理条件和通过阴极微弧沉积氧化锆-氧化钇陶瓷涂层的规律和机理；掌握阴极微弧沉趸?氧化钇陶瓷涂层体系的微观结构和主要高温性能；为发展新一代燃气涡轮叶片的热障陶瓷涂层提供新的途径。此新技术在航空、能源、交通等工业有广泛的应用前景。.