Fe-Ni alloy material used for shadow mask having improved formability of through-holes by etching
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United States of America Patent
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-
Dec 31, 2002
Grant Date -
Apr 4, 2002
app pub date -
Jul 17, 2001
filing date -
Jul 17, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the production or a shadow mask, the through-holes for passing an electron beam are formed by etching of the Fe--Ni alloy. The variation in diameter of apertures is prevented by dispersing 2000 or more of precipitates and inclusions from 0.01 .mu.m to 5 .mu.m in diameter on the surface of said material per mm.sup.2. The Fe--Ni alloy of from 34 to 38% of Ni, not more than 0.5% of Mn, and if necessary, from 5 to 40 ppm of B, and from 5 to 40 ppm of N, the balance being Fe and unavoidable and incidental impurities with the proviso of 0.10% or less of C, 0.30% or less of Si, 0.30% or less of Al, 0.005% or less of S, and 0.005% or less of P.
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