| 摘要 |
PROBLEM TO BE SOLVED: To provide a stock for shadow mask, free from dispersion of electron beam transmission hole diameter at etching and excellent in property of piercing by etching. SOLUTION: In the stock for shadow mask excellent in the uniformity of opening diameter at the formation of electron beam transmission holes by etching, etching pits of 0.5-10μm diameter are produced with >=2,000 pieces/mm2 frequency when the surface of an FG-Ni alloy stock having a composition consisting of 34-38% Ni, <=0.5% Mn and the balance Fe with inevitable impurities or accompanying elements (where C, Si, Al, S and P are made to <=0.10% C, <=0.30% Si, <=0.30% Al, <=0.005% S and <=0.005% P) is mirror polished and immersed in a 3% nitric acid-ethyl alcohol solution at 20 deg.C for 30 s. In addition, a simple method for observing the existence of fine inclusions or precipitates in the Fe-Ni alloy stock and a method for discriminating the uniformity of hole diameter when electron beam transmission holes are pierced by etching are also provided.
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