Barre en alliage niobium - zirconium

Introduction Of Niobium Zirconium Alloy Rod
Niobium zirconium alloy (Nb-Zr1) is an alloy composed of the base metal niobium with the alloying element zirconium and other alloying elements. An alloy consisting of zirconium in the metallic niobium. The combined alloy has improved strength, oxidation resistance, and corrosion resistance to molten alkali metal. It is low strength and high ductility alloy. The most important niobium zirconium alloys are NB-1Zr and Nb-Zr10 alloys.

Adding zirconium to niobium can improve the strength of the alloy without affecting the plasticity and machining properties of the alloy. Zirconium can also improve the oxidation resistance and alkali metal corrosion resistance of the alloy

The Chemical Composition Of Niobium Zirconium Alloy Rod

Grade	Major Element		Impurity Element
			≤
	Nb	Zr	Ti	C	O	H	Ta	Fe	Si	W	Ni
Nb-Zr1	Remain	0.8-1.2	0.02	0.01	0.015	0.0015	0.1	0.005	0.005	0.03	0.005
Nb-Zr2	Remain	0.8-1.2	0.03	0.01	0.025	0.0015	0.5	0.01	0.005	0.05	0.005

The Physical Properties Of Niobium Zirconium Alloy Rod

Grade	Tensile  strength	Yield   strength,	Elongation	Reduction of area
	Mpa	MPa	%
Nb-Zr1/Nb-Zr2	≥195	≥125	≥20	/

Niobium-tungsten alloy is a niobium alloy formed by adding a certain amount of tungsten and other elements based on niobium.

Tungsten and niobium form an infinite solid solution.

Tungsten is an effective strengthening element for niobium, but with the increase of tungsten addition, the plastic-brittle transition temperature of the alloy will rise, and the grain will grow significantly. Therefore, in order to obtain high-strength niobium-tungsten alloys, the addition of tungsten must be properly controlled, and at the same time, elements such as zirconium and hafnium must be added to refine the grains and reduce the plastic-brittle transition temperature.

Niobium-zirconium wire is the earliest practical superconducting wire, the composition range is 15% to 50% Zr, the Jc of 25% to 35% Zr is the best, the Hc2 of 65% to 75% Zr is the highest, and the typical composition is 25% Zr and 33% Zr, density 7.2 ~ 7.7g/cm2. The basic process for preparing wire rods is:

Niobium+zirconium--->vacuum casting--->1200℃ hot forging--->rod making--->drawing--->heat treatment--->copper plating

Niobium-zirconium alloy has high hardness and is difficult to process. It is easy to stick to the mold when drawing, so a stainless steel tube should be used. Use a wire diameter of 0.025 to 0.51mm. Jc increases with the increase of cold working degree. Heat treatment at 600-700°C has phase transformation, which can increase Jc by an order of magnitude. When heat treatment above 750°C, a high temperature phase will be formed, which will significantly reduce Jc.