论文部分内容阅读
研究了溅射微晶涂层对K38G在800℃和900℃空气中氧化动力学的影响。发现微晶化后K38G的氧化动力学与经典的抛物线规律存在负偏差。分析认为,微晶化后氧化物形核率大大提高,氧化膜中的扩散由晶格扩散变为晶界短路扩散为主,从而改变了氧化膜的生长动力学。根据Wagner高温氧化的基本理论,对微晶合金高温氧化动力学规律进行了探讨,导出微晶K38G合金氧化动力学遵循四次方规律,即x4=kPt。
The effect of sputtered microcrystalline coating on K38G oxidation kinetics in air at 800 ℃ and 900 ℃ was studied. It is found that the oxidation kinetics of K38G after microcrystallization has a negative deviation from the classical parabolic law. The analysis shows that the nucleation rate of the oxide after microcrystallization is greatly increased, and the diffusion in the oxide film changes from lattice diffusion to grain boundary diffusion, which changes the growth kinetics of the oxide film. According to the basic theory of Wagner oxidation at high temperature, the oxidation kinetics of microcrystalline alloy was discussed. The oxidation kinetics of microcrystalline K38G alloy follows the law of the fourth power, x4 = kPt.