稀土表面改性在改善高温抗氧化和耐蚀性方面的应用

稀土元素具有特殊的电子结构,对材料表面有着优异的改性潜力,在表面工程技术领域具有良好的应用前景.本文综述了在化学热处理、激光熔覆、离子注入、真空等离子体镀膜、热喷涂等技术中,稀土元素对工艺过程的影响和提高材料表面改性层高温抗氧化及耐腐蚀性能的效果.初步探讨了稀土元素在改性层中的作用机理.作者认为,稀土元素的微合金化作用,改变改性层中第二相或夹杂物的形态与性能,使改性层组织细化和结构因素,是稀土元素改善材料表面改性层高温抗氧化和耐腐蚀性能的主要原因.

Application of Rare Earth in Improvement of High Temperature Oxidation Resistance and Corrosion Resistance of Modification Coatings

Rare earth element has good potentiality of being surface modification of materials for its special electronic structure, and it has a good application prospect in surface engineering. This paper reviews influences of rare earth on the technical process and the properties of high temperature oxidation resistance and corrosion resistance of surface modification coatings of materials prepared by means of thermo - chemical treatment, laser cladding, ion implantation, vacuum plasma plating, thermal spray technology and so on. Some effect mechanisms of rare earth on properties of modification coatings are briefly introduced. It is thought that rare earth plays an important part in micro alloying, changing the morphology and the properties of precipitation and inclusion, mierostruetures refinement and phase structure factors, which is the main reason for rare earth element to improve the properties of surface modification coatings of materials.