激光熔覆高厚度涂层技术研究现状及发展趋势

摘要

Laser cladding is an important new technology of material modification and has a good prospect. With the improvement of mechanical strength, low thickness of the cladding layer can not meet the performance requirements, so laser cladding trends to prepare the high thickness coating. Now, the single and multi-layer laser cladding techniques are the main measures to achieve the high thickness coating, and the multi-layer laser cladding is divided into a constant chemical composition multi-layer cladding (CCCMLC) and functionally gradient material multi-layer cladding (FGMMLC). The research status of high thickness coating by single-layer and multi-layer laser cladding and highlights status of the FGMMLC were summarized. Finally,the development trend of the technology in the future was prospected.%激光熔覆是一项重要的材料改性新技术,有着良好的应用前景.随着机械强度的提高,低厚度的熔覆层已不能满足要求,激光熔覆向着制备高厚度涂层方向发展.现在主要通过激光单层和多层熔覆两种技术手段来获得高厚度熔覆层,其中多层熔覆技术分为恒定成分多层熔覆和梯度多层熔覆.综述了激光单层熔覆和多层熔覆的研究现状,并着重介绍了梯度多层熔覆的研究现状,最后展望了该技术的发展趋势.