Production method for tantalum and tantalum alloy bars
A tantalum alloy and bar technology is applied in the field of preparation of tantalum and tantalum alloy bars, which can solve the problems of reducing the yield of tantalum bars, uneven performance of tantalum bars, and low density at both ends of the product, and achieves high production efficiency and shrinkage. The effect of uniform deformation and uniform density
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Embodiment 1
[0018] Prepare 34 tantalum bars with a single weight of 6 kg. Put 6kg of tantalum powder with a purity greater than 99.9% into a rubber sheath with an inner diameter of 32mm, insert a rubber stopper at the opening of the sheath, wait for the air in the sheath to escape, and tie the latex sheath at the rubber stopper with iron wire. Knead the covered billet evenly and clamp it with two splints, and then fix the splint and the billet together with a rubber band. Prepare 34 billets as above, and then place them in a cold isostatic pressing machine, control the maximum holding pressure to 250 MPa, and hold the pressure for 15 minutes. Complete the cold isostatic pressing molding, and finally unload the mold to obtain 34 compacts.
[0019] Put 34 compacts into a vacuum heating furnace, and gradually heat up and keep warm according to the sintering process in the table below. After reaching the final sintering temperature of 2400°C, keep warm for 8 hours. Then the temperature is l...
Embodiment 2
[0035]
[0036] According to the process in Example 1, the proportion of 60% of tantalum powder and 40% of niobium powder is taken by weight, and it is formed and sintered by vacuum indirect heating.
[0037] Then roll them into Ф3mm round tantalum-niobium alloy strips respectively, with H 2 S0 4 : HN0 3 : HF=5:3:3 (volume ratio, the molar concentrations of the three are 18.4mol / L, 16mol / L, and 22.8mol / L in turn) pickling, washing and drying, and then annealing in a vacuum annealing furnace. The annealing conditions are such as 1200° C. and holding for 120 minutes.
[0038] After annealing, the circular tantalum wire is continuously drawn to Ф0.19mm, and then cleaned again, dried naturally, and then straightened for multiple rounds, and then coiled, and then tested for physical properties, chemical impurities, and electrical properties of the product. Then it is packaged and put into storage, and the preparation of the tantalum-niobium alloy wire is completed.
[0039] ...
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