冷軋退火製程對Invar結晶方向及磁性之影響

Effects of Cold Rolling and Annealing on Texture and Magnetic Property of Invar Alloy

江柏風(B. F. Jiang) ； 張樹發(S. F. Chang) ； 劉金耀(J. Y. Liu) ； 謝景諒(C. L. Hsieh) ； 劉瑞贇(J. Y. Liun) ； 楊正之(C. C. Yang)

《材料科學與工程》 33卷2期 (2001/06) Pp. 111-116

https://doi.org/10.6409/JMSE.200106.0111

摘要

影像管中所使用的網罩為彩色影像管重要關鍵組件，網罩之用途在於遮蔽過多的高壓電子束二網罩(Shadow Mask)的材料已開始以Invar合金板片取代傳統上使用的鋁淨鋼(Al-uminum-killed Stee1 or AK Steel)板片。Invar，為64%Fe-36%Ni的合金，其有低熱膨脹係數及低的矯頑磁力。本研究以探討一次冷軋、一次退火、二次冷軋、二次退火、三次冷軋等製程步驟對於Invar合金的結晶方向與磁陸的影響。我們得知，G200隨著軋延量增加而降低；而矯頑磁力隨著軋延量的增加而升高，若再經退火處理後，G200隨著前一次軋延量的增加而升高，並且矯頑磁力隨著前一次軋延量的增加而降低，其原因是因經過冷軋退火製程之後，除了消除殘留應力之外，也使得蓬{200}面的晶粒再結晶、成長，促使{200}面沿著板片軋延方向排列，同時也降低了差排密度，使得更容易地讓磁矩轉動及磁壁移動。

關鍵字

Invar ； 冷軋 ； 退火 ； 結晶方向 ； 磁性

並列摘要

The shadow mask is one of the critical components in CRT display tube. Its function is to block the incoming excess electrons from hitting the fluorescent material that is coated on the tube glass. Invar, a 64%Fe-34%Ni alloy, is regarded as an ideal material to replace the traditionally used aluminum-killed steel, due to its low coefficient of thermal expansion and low coercive force. This work is to investigate the respective effect of the material processing steps of Invar, i.e., 1(superscript st) cold rolling, 1(superscript st) annealing, 2(superscript nd) cold rolling, 2(superscript nd) annealing and 3(superscript rd) cold rolling, on the crystallographic orientation and magnetism of the alloy. A decreasing G200 and an increasing coercive force were observed as the cold-rolling ratio was increased from 50 to 95%. However, upon annealing the previous samples, opposite effects. i.e., an increasing G1200 and a decrease coercive force, were seen. The increase of G200 is attributable to the recrystallization of new grains on {200} which is the rolling plane. In addition, it is speculated that the decrease of coercive force is due to the reduction of dislocation density, which facilitates the rotation of magnetic domains and movement of magnetic walls.

並列關鍵字

Invar Cold rolling ； Annealing ； Orientation ； Magnetism