Nippon Mining & Metals Co., Ltd.

Nippon Mining Co., Ltd.

Norio Yuki

Yoshihisa Kita

Tetsuo Kawahara

Toshiyuki Ono

Kazuhiro Taki

Masazumi Mori

Yoshihiro Ozeki

The creep property of a shadow mask, which has cathode-ray passing apertures, in the form of dots or slots formed by etching, and to which tension is then applied without undergoing press-forming, is enhanced. The Fe&mdash;Ni alloy containing from 30-50% of Ni, the balance consisting of iron and unavoidable impurities, has cold working temper of not less than 30% and not more than 57% of the final working degree.

Fe-Ni alloy for tension mask and tension mask using it and color crt

Method for producing Fe&mdash;Ni alloy

Disclosed is a process for producing Fe&mdash;Ni alloys used for electron gun parts. The alloy consists of: all by weight, 30 to 55% of Ni; 0.05 to 2.00% of Mn; 0.001% to 0.050 of S; and the balance of Fe and inevitable impurities. The process substantially consists of melting, casting, hot working, cold rolling and annealing. The Fe&mdash;Ni alloy satisfies 0.0005&lE;((%Mn)*(%S))&lE;0.0100. The hot working is carried out at a temperature T defined by the following equation.

Process for producing Fe-Ni alloys used for electron gun parts

Composition segregation which results in streaks in an Fe--Ni alloy sheet shadow-mask is prevented by the following conditions. Heat-treatment from 1150.degree. C. to a temperature lower than the melting point for longer than 1 hour and not longer than 30 hours. Subsequent rough-rolling or forging at a reduction of area of 40% or more. A slab is subjected to removal of oxide scale on its surface and then heated in hydrogen atmosphere having dew point of 10.degree. C. or lower at a temperature of not less than 1100.degree. C. and lower than the melting point for time (t - hour) which is defined by:

Method for producing a Fe-Ni alloy sheet and a Fe-Ni alloy shadow mask

Disclosed are Fe-Ni alloys used for electron gun parts and press punched electron guns, typically a electron gun electrode manufactured by press punching, comprising: all by weight, 30 to 55% of Ni; 0.0010 to 0.0200% of S; 0.1 to 0.8% of Mn; no more than 0.3% of Si; no more than 0.05% of Al; no more than 0.005% of O; and the balance of substantially Fe and inevitable impurities; said alloy preferably having a crystal grain size of not less than 7.0 in grain size number based on JIS G 0551. When oxide-type inclusions are included, Mn and S which form MnS combine with the oxide-type inclusions, so that MnS which is effective for improvement of punching properties do not sufficiently precipitate. Therefore, the invention controls contents of elements forming oxides in proper ranges.

Fe-Ni alloys having improved punching properties and punched electron

An Fe--Ni alloy for use as a part 10 of an electron-gun 4 is press-blanked by a punch to form minute apertures 10a, 10b, 10c for passing an electron beam 3. The burrs 10 formed around the minute apertures 10a, 10b, 10c are detrimental to such part 4. The Fe--Ni alloy according to the present invention essentially consists of from 30 to 55 wt % of Ni, not more than 0.5 wt % of Si, not more than 1.5 wt % of Mn, and the balance being Fe and unavoidable impurities. The alloy includes from 10 to 1,000 of A type or B type non-metallic inclusions of 10 .mu.m or more in length per 1 mm.sup.2 of longitudinal cross section, and from 100 to 50,000 of C type non-metallic inclusions having a diameter of 5 .mu.m or less.

Fe-Ni alloy for parts of electron-gun and blanked parts for electron-gun

Fe--Ni alloys for electron gun parts consisting of, all by weight, 30-55% Ni, 0.0010-0.200% S, up to 0.8% Mn, from not less than 0.005 to less than 0.5% in total of one or more elements selected from the group consisting of Ti, Mg, Ce and Ca, and the balance substantially Fe and unavoidable impurities, and electron gun parts, typically electron gun electrodes, made of the alloys by punching are provided. Controlling the grain size number to No. 7.0 or above is also effective. The Fe--Ni alloys of this invention for electron gun parts are remarkably improved in press punchability and can solve burring problems through the easy formation of sulfide inclusions of Ti, Mg, Ce, and Ca.

S-containing Fe--Ni alloys for electron gun parts and punched electron

A laminated magnetic core is characterized in that core-forming thin sheets each having a surface roughness such that the maximum height Rmax is at least 1 .mu.m are laminated together with a sheet-to-sheet distance of 2 to 10 .mu.m, desirably 3 to 6 .mu.m and that at least a part of protruded portions of the opposite roughed surfaces is diffusion-bonded to each other at the interface between adjacent thin sheets. The laminated magnetic core may have innumberable voids present at the diffusion-bonded interface between the adjacent thin sheets. This invention further provides a method of manufacturing a laminated magnetic core comprising the steps of providing a plurality of core-forming thin sheets each having a surface roughness such that the maximum height Rmax is at least 1 .mu.m; laminating and bonding said core-forming thin sheets one upon another through an organic adhesive, desirably at a sheet-to-sheet distance of 2 to 10 .mu.m; punching out a block of a given shape from said laminated and bonded core-forming sheets by a press; and thereafter magnetically annealing the block while decomposing and vaporizing said organic adhesive to effect diffusion-bonding at the interface between adjacent thin sheets of the block lefting innumberable voids at the interface.

Laminated magnetic core and method of manufacturing same

There is disclosed a laminated magnetic core characterized in that core-forming thin sheets each having a surface roughness such that the maximum height Rmax is at least 1 .mu.m are laminated together with a sheet-to-sheet distance of 2 to 10 .mu.m, desirably 3 to 6 .mu.m and that at least a part of protruded portions of the opposite roughed surfaces is diffusion-bonded to each other at the interface between adjacent thin sheets. The laminated magnetic core may have innumerable voids present at the diffusion-bonded interface between the adjacent thin sheets. This invention further provides a method of manufacturing a laminated magnetic core comprising the steps of providing a plurality of core-forming thin sheets each having a surface roughness such that the maximum height Rmax is at least 1 .mu.m; laminating and bonding said core-forming thin sheets one upon another through an organic adhesive, desirably at a sheet-to-sheet distance of 2 to 10 .mu.m; punching out a block of a given shape from said laminated and bonded core-forming sheets by a press; and thereafter magnetically annealing the block while decomposing and vaporizing said organic adhesive to effect diffusion-bonding at the interface between adjacent thin sheets of the block leaving innumerable voids at the interface.

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Kanagawa, Japan

Norio Yuki