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        Hafnium, niobium alloy (Niobium Hafnium alloys)

        Date:2011-11-18 15:35


        Niobium-based alloy of hafnium and niobium added amount of other elements is formed. On the binary phase diagram, niobium and β-Hf substitution solid solution formation.
             Hafnium is an active element, HfO2 and HfC compound with oxygen and niobium carbide connate, since dispersion strengthening effect, while reducing the harmful effects of interstitial elements improve weldability and niobium alloy coating properties. Hafnium, niobium alloy aerospace engineering and technology applications up to the amount of a niobium alloy.
             In 1965, the United States successfully developed Nb-10Hf-1Ti alloys, and for the Apollo manned lunar module drop-stage rocket engine nozzle extension in 1969. In 1975, China successfully developed NbHf10Ti1Zr0.7 niobium alloys.
             Hafnium, niobium alloys by strengthening divided into two categories: solid solution strengthening alloy and solid solution strengthening and dispersion strengthened alloy combine.
             Hafnium, niobium alloys have good mechanical properties, weldability (Table 1, Table 2).
             Table 1 Typical mechanical properties of hafnium and niobium alloys
             Table 2 Nb-10Hf-1Ti alloy welding
             Preparation: Preparation of ingots and plastic processing: hafnium, niobium alloy commonly used electron beam melting and vacuum consumable arc melting method of combining the preparation of ingots, then extruded or forged billet at a temperature above 1200 ℃, in rolling and drawing, and other processing at temperatures below 500 ℃, can be made plate, strip, rod, wire and forgings and other products.
             Welding: hafnium, niobium alloys have good weldability, usually argon gas tungsten arc welding and electron beam welding method to realize the connection of the parent metal, weld the two methods can also be used to complete the welding hafnium and niobium alloy with titanium and titanium alloys. Weld quality with purity argon and vacuum, which are usually higher purity argon, residual atmospheric pressure, the lower, the better the quality of the welds.
             Heat treatment: the general use of vacuum or inert gas annealing and solution and aging treatment.
             Coating: usually Cr-Ti-Si and Cr-Fe-Si-based anti-oxidation coating. Tu plus two niobium, hafnium alloy coating antioxidant life at 1371 ℃ in the air in more than 150h.
             Uses: mainly used for liquid rocket engine nozzle extension and radiative cooling thrust chamber body sections, space power systems molten sodium and sodium-potassium alloy pressure tubes and turbine pumps, jet engine high temperature structural components.

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