Niobium alloy has the characteristics of high melting point and low density and is widely used as additive in other alloys and aerospace industry. Nb could significantly improve the anti-oxidation performance of Y-alloy. On the other hand, Nb had a high solubility in the alloy, so high Nb alloying was possible. Chen Guoliang et al. conducted extensive basic research on T1-Al-Nb and developed earale alloys with a high Nb content. At the first Earale International Conference in 1995, Dr. Young-wonkim, chairman of the conference, reported that earale alloys with a high Nb content was the first to develop earale alloys at high temperature and high performance. The low purity of niobium aluminum alloy results in poor tissue stability and high temperature ectasia. At present, the production method of high purity niobium aluminum alloy only stays in the laboratory stage, and a simple and cheap industrial production method is continued.
Aiming at the above problems, a production method of high purity niobium aluminum alloy was proposed to realize the advantages of simple preparation method, low production cost and high purity niobium aluminum alloy. It can be widely used in the industrial production of high purity niobium aluminum alloy.
To achieve the above purposes, the technical scheme adopted in the present invention is: a production method of high purity niobium aluminum alloy, including the following steps: the high purity niobium aluminum alloy ingot is prepared by combining vacuum electron beam melting and true blank consumable arc melting.
The production method of niobium aluminum alloy with high purity is scientific and reasonable. It is prepared by vacuum electron beam melting and true blank consumable arc melting. Compared with the existing technology, the preparation method is simple, the production cost is low and the product is high purity. It can be widely used in the industrial production of high purity niobium aluminum alloy. In order to prevent air pollution, heat treatment of high purity niobium alloy must be carried out under vacuum or high purity inert gas protection. When high purity niobium aluminum alloy is used in high temperature oxidation environment, anti-oxidation coating must be added.
Wherein, the aluminum is electrolytically refined high-purity aluminum with a purity greater than 99.99%. The titanium is zero-grade sponge titanium. The main methods of preparing niobium and Niobium alloy ingots are vacuum electron-beam melting with purity greater than 99.8%, true blank arc melting and the combination of these two melting methods. Electron beam smelting is used to purify niobium and niobium alloy and prepare small diameter ingots. Large size ingots with more uniform alloy composition can be prepared by consumable arc smelting. High purity niobium and silver ingots can be prepared by electron beam suspension zone smelting.
