利用固滴技术对氧化基片上液态Fe-Cr合金润湿性的研究

STUDIES OF WETTING CHARACTERISTICS OF LIQUID Fe-Cr ALLOYS ON OXIDE SUBSTRATES BY SESSILE DROP TECHNIQUE

本文的目的是研究三种不同的氧化基片(氧化铝、氧化镁及白云石)的润湿特性,以检验Fe-Cr合金在这些基片上的粘附功。利用固滴技术在H2气氛中1823 K下,对氧化基片上液滴(Fe-Cr合金)的接触角进行了研究。随着Cr浓度的增加在氧化铝和白云石基片上的接触角会稍微减小,但不会像在氧化镁基片上变化那么大。在测试基片中,氧化铝基片接触角最大,白云石基片接触角最小。因此,白云石的粘附功最大,这与实际工艺中观察到的结果相符。

The purpose of this study was to investigate the wetting characteristics of three different oxide substrates （ alumina, magnesia and dolomite） in order to examine the work of adhesion of Fe - Cr alloys on these substrates. The contact angle of a liquid drop （ Fe - Cr alloy） on the oxide substrates was investigated at 1823 K under a H2 atmosphere by the sessile drop technique. The contact angle slightly decreased on the alumina and dolomite suhstrates with increasing chromium concentration, but did not change as much on the magnesia substrate. Among the tested substrates, alumina exhibited the highest contact angle and dolomite exhibited the lowest one. Accordingly, dolomite had the strongest work of adhesion, which was in agreement with the observations in the practical process.