Preparation technology of niobium bar

Abstract

The invention discloses a preparation technology of a niobium bar. An aluminothermic method of reducing is adopted. The technology comprises the following specific steps of 1 performing dosing, 2 performing mixing, 3 performing a reduction reaction, 4 performing vacuum heating, 5 performing molding and 6 performing vacuum sintering. According to the preparation technology of the niobium bar, underthe condition of needing no purification, after the reduction reaction, vacuum heating and vacuum sintering are performed, due to continuous and repeated heating and heat preservation heating treatment during vacuum heating, Al, Al2O3 and NbO are volatilized from a niobium thermite, the purity of the prepared niobium bar is higher, the contents of various impurities can be remarkably lowered, thetechnological process is shortened, operation is easy, the cost is low, environment governing production is facilitated, and the requirement of clients is met.

Description

technical field [0001] The invention belongs to the technical field of metal preparation technology, and in particular relates to a preparation technology of niobium bars. Background technique [0002] Niobium bar products are bar products made of high-purity niobium metal, which can be used as additives for iron-based, nickel-based and zirconium-based superalloys to improve their strength properties. Niobium and niobium alloys are high-temperature-resistant materials. Among the four major "space metals" of aerospace, tungsten, molybdenum, tantalum, and niobium, niobium alloys have the best comprehensive properties, showing good plasticity and excellent processing and welding performance. In recent years, with the continuous development of aviation and aerospace industries, the scope of application of niobium-containing alloys has been further expanded, and they are widely used in structural components and heat-resistant system materials of aircraft and rocket engines. The ...

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Problems solved by technology

[0003] The thermal aluminum reduction method in the prior art has a long production cycle and a relatively low total output, which leads to an increase in the cost of the entire reduction process. At the same time, the reduction product metal niobium is not high in purity and contains a certain amount of aluminum, and it needs to be smelted by electric arc. Or electron beam smelting for further purification before making niobium bars

Because the reactants are in contact with each other, it is difficult to control the reaction position and the shape of the niobium powder. The niobium powder is easy to adhere to the wall of the reaction vessel and introduce new impurities. Not only the process is cumbersome, the cost is high, and it cannot meet the requirements of customers.

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