Nb-silicide-based ultrahigh temperature alloys have attracted considerable attentions as potential high temperature structural materials because of their high melting point,suitable density,good elevated temperature creep strength and acceptable room temperature fracture toughness.

Structure formation of co-deposition of Si and Al coatings on advanced Nb-based ultrahigh temperature alloy by pack cementation process;

Structure of Al-modified silicide coatings on a Nb-based ultrahigh temperature alloy by pack cementation process;

Si-Y co-deposition coatings on an advanced Nb-based ultrahigh temperature alloy were prepared by pack cementation process at 1050 and 1150℃for 5-20 h,respectively.

At present, niobium-based ultrahigh-temperature alloys are usually prepared by multiple arc-melting in order to get uniform as-cast ingots.

The master alloy ingot of Nb-Ti-Si based ultrahigh temperature alloy was prepared by vacuum nonconsumable arc melting.

Four batches of multicomponent Nb-based super-high temperature alloys with different compositions have been prepared by vacuum consumable arc-melting or vacuum non-consumable arc-melting.