The production method of niobium or tantalum strip foil is described in detail by taking the thickness of tantalum sintered blank is 40mm and the thickness of finished tantalum strip foil is 0.06mm.
First of all, Ta1 tantalum electron beam melting billet of 40×650×600mm (thickness × width × length) is annealed at 1000℃ and 32h, and the annealed billet is sent to a 2-roll rolling mill of Φ580×850mm for reversible multi-pass rolling, in which the two rolls of the mill are work rolls. The transmission form is work roll drive. After 13 passes reversible rolling of 2-roll rolling mill, the thickness of tantalum billet is reduced to 11.2mm. At this time, the tantalum billet is interrupted, cut, straightening, surface cleaning and intermediate annealing processes. Tantalum billet with a thickness of 11.2mm after finishing, cleaning and annealing is sent to a 2-high roller rolling mill for reciprocating and reversible rolling. After 15 passes of double rolling, the thickness of 11.2mm tantalum billet is reduced to 3.2mm. At this time, the tantalum billet is interrupted, cut, straightened, cleaned and annealed again.
Then, the tantalum billet with a thickness of 3.2mm after finishing, cleaning and annealing is sent to the same rolling mill. At this time, the rolling mill changes the roll system. The original two work rolls with a diameter of Φ580mm are used as support rolls, and two new work rolls with a diameter of Φ260mm are added. The tantalum billet with a thickness of 3.2mm is reduced to 1.5mm after being rolled by a 4-high rolling mill with 9 passes. At this time, the tantalum billet is interrupted, cut, straightened, cleaned and annealed again. After finishing, cleaning and annealing, the tantalum billet with a thickness of 1.5mm is sent to the same 4-roll rolling mill for 13 cycles of reversible rolling, and the thickness is reduced to 0.48mm. At this time, the tantalum billet is interrupted, cut, straightened, surface cleaning and intermediate annealing processes again.
Finally, 72 pieces of tantalum billets with a thickness of 0.48mm and a length of 940mm were welded into strips by a spot welding machine after finishing, cleaning and annealing processes, and a copper lead strip with a length of 8000mm and a thickness of 0.48mm was welded at the front and back of the strip. Tantalum billets welded into strips with a thickness of 0.48mm are sent to another 6-roll rolling mill for loading and coiling, and then reciprocating reversible rolling process is carried out. The 6-roll rolling mill with a specification of Φ60/Φ160/Φ400×850mm and the 0.48mm thick tantalum billets are rolled through 25 passes of the 6-roll rolling mill. The thickness is reduced to 0.06mm, and the tantalum strip foil with a thickness of 0.06mm is completed after finished cleaning, finished annealing, finished cutting and passed the final product test.
