涂层—合金体系的高温过程

COATING-SUBSTRATE SYSTEM AT ELEVATED-TEMPERATURE PROCESS

本文论述了高温下涂层材料的氧化防护机理。其界面的高温过程是氧化气氛通过熔融涂层向基体扩散,导致基体合金氧化。另一过程是合金元素和涂层某些组分如硅,在界面处向内扩散。研究结果揭示了涂层一合金体系的氧化作用。涂层的作用在于阻滞氧化气氛的扩散,从而减缓铬的贫化,但不减缓钛、铝的贫化。此外,涂层中的硅,在高温过程中也有少量渗入,其深度在1100℃1000小时后为0.2mm。界面处除生成氧化物外,未发现其它反应生成物。

This paper discusses the mechanism of protection against oxidation of coated materials at elevated temperature.The high temperature processon interface be- tween coating and substrate is as follows,oxygen diffuses through coating onto substrate,then it results in oxidation of alloy elements. The performance of coating is to reduce diffusion of oxidizing atmosphere, thus it also reduce pauperization of Cu,but it is out of function for Ti and Al. Besides,there is small amount of Si to permeate into substrate,its thickness is about 0.2mm after duration of 1000hrs at 1100℃. Besides oxidation,no other resultant of reaction has been found along inter- face between coating and substrate.