At present, molybdenum niobium alloys are prepared by electron beam melting or hot isostatic pressing or vacuum sintering. The electron beam smelting molybdenum niobium alloy has coarse grain and high cost. The hot isostatic pressing method also has the defects of high cost and limited product specifications, and vacuum sintering has the disadvantages of low density and high oxygen content.
Molybdenum and niobium powder were deoxidized and mixed for cold isostatic pressing to obtain molybdenum and niobium alloy raw form. Molybdenum and niobium alloy raw form was sealed by stainless steel envelope and then heat treated in a high temperature furnace to obtain molybdenum and niobium alloy semi-blank. After removing the stainless steel envelope, molybdenum and niobium alloy semi-blank was treated twice in a hydrogen furnace to obtain low oxygen molybdenum and niobium alloy. Molybdenum niobium alloy green is wrapped with stainless steel sheath, and sealed after heating temperature ≥500℃ and vacuuming 10-3pa.
Oxygen molybdenum niobium alloy forging process, heating temperature greater than 1400℃, heating time ≥1h, pass deformation ≥ 20%, heating once forging one to two times, to obtain low oxygen molybdenum niobium alloy pipe.
The low-oxygen molybdenum-niobium alloy pipe is prepared by the preparation method of the low-oxygen molybdenum-niobium alloy pipe. Molybdenum niobium alloy pipe density ≥9.9g/cm3, o % ≤ 0.02%.
Advantages: Low oxygen and high density molybdenum niobium alloy is obtained by more economical preparation method, and then multi-specification molybdenum niobium alloy tube is prepared by forging, which has high density and low oxygen content. The results show that the content of niobium metal is low, the distribution of niobium metal is uniform, the grain size of molybdenum-niobium alloy is uniform, the sintering holes are few, and the densification is high.
