Niobium Aluminosillcide Coating based on High Temperature Exothermic Reaction and Properties Testing

提出了一种基于电弧表面合金化的表面改性新方法，并对其在铌母材上镀镀铌铝化物的可行性进行了研究。用钨弧熔化放置在铌块上的铝板时，铌表面也被熔化，在铌块上形成Al-Nb二元合金熔池。熔池在铌块表面凝固成铌铝化物，在镀膜层的上表面形成一层较厚的NbAl_3层。当用铝硅合金板代替铝板时，在铌块上形成铌铝硅化物层。

A new method for surface modification based on the arc surface alloying has been proposed and its feasibility has been investigated performing niobium aluminide coating on a niobium base metal. When tungsten arc was used to melt an aluminum plate placed on a niobium block, the niobium surface was also melted and a melt pool of an Al-Nb binary alloy was formed on the niobium block. The melt pool solidified into niobium aluminides on the surface of the niobium block, forming a thick NbAl_3 layer on the top surface of the coating layer. When an Al-Si alloy plate was used instead of the aluminum plate, a niobium almino-silicide layer was formed on the niobium block.