先进铝化物涂层制备技术进展

铝化物涂层是现役发动机热端部件高温氧化防护的主要手段。未来,高性能铝化物涂层仍是发展先进发动机所必需的技术。传统基于化学气相的制备方法不仅污染环境,腐蚀设备,效率低下,更重要的是难以有效制备高性能铝化物涂层。高效"绿色"化将是先进铝化物涂层制备技术的发展趋势。近年通过利用机械能辅助的策略获得了高效制备铝化物涂层的方法。另外,利用真空物理气相沉积加高温扩散的策略,"绿色"制备高性能铝化物涂层的研究也进展显著。结合上述两种策略,利用真空等离子辐照形成的离子撞击能,可高效、"绿色"地制备铝化物涂层,为高性能铝化物涂层的制备提供了一种新的有效途径。

Advancement of Technologies for Preparing High-Performance Aluminide Coatings

Aluminide coatings is one key for protecting hot sections of turbine engines against high temperature oxi-dation at present, which will also be an essential technique for developing advanced turbine engines in the near future. Con-ventional techniques for preparation of the coatings are commonly based on chemical vapor methods, which are dififcult for obtaining high performance aluminide coatings except for low efifciency, chemical hazards release that induces air pollu-tion and equipment corrosion. High efifcient and “green” techniques would be future trends for obtaining advanced alumi-nide coatings. High efifciency has been achieved by a strategy of mechanical energy-assisted aluminizing in recent years. In the mean time, “green” techniques have been developed by a strategy of combining physical vapor deposition and post high temperature diffusion treatment. By combining the two strategies, high efifcient and “green” aluminizing can be achieved, using ion bombardment energy generated from ionized physical vapors in vacuum. It would be a new effective solution to preparation of advanced aluminide coatings.