Niobium is widely used as electrode material because of its good plasticity, high conductivity and overflow work. Niobium strips currently have two main uses: one is as one of the main materials in the electrode heads of cold cathode fluorescent tubes (CCFL). Mainly using its high sputtering resistance, long service life and can form good processability with cheap raw materials, the manufacture of cold cathode discharge tube electrodes has been widely used; The second is used to make key components of high-pressure sodium lamps, such as niobium strip connectors as conductive paths. It is mainly due to its excellent resistance to metal sodium corrosion and good high temperature performance.
The rolling process adopts three passes:
1) The first roll
The niobium strip to be rolled is put into the 16-high mill and the first rolling is carried out at room temperature. The mechanical parameters of the first rolling are as follows: The driving side force is 95 ~ 130KN, the operating side force is 105 ~ 135KN, the left tension is 1.100 ~ 1.150KN, the right tension is 0.865 ~ 0.900KN, and the rolling force is 205 ~ 255KN; The thickness of niobium strip after the first rolling is 0.03 ~ 0.05mm.
2) Second pass rolling
The niobium strip after the first roll is put into the 16-high mill and the second roll is carried out at room temperature. The mechanical parameters of the second roll are as follows: The driving side force is 90 ~ 105KN, the operating side force is 130 ~ 145KN, the left tension is 0.560 ~ 0.675KN, the right tension is 0.865 ~ 0.900KN, the rolling force is 230 ~ 255KN; The thickness of niobium strip after the second rolling is 0.024 ~ 0.026mm.
3) Third pass rolling
The niobium strip after the second pass is put into the 16-high mill and the third pass is rolled at room temperature. The mechanical parameters of the third pass are as follows: The driving side force is 105 ~ 110KN, the operating side force is 115 ~ 130KN, the left tension is 0.670 ~ 0.690KN, the right tension is 0.575 ~ 0.580KN, the rolling force is 225 ~ 240KN; The thickness of niobium strip after the third rolling is 0.017 ~ 0.019mm.
