US20020043306A1 - Fe-Co-Ni alloy and use for the manufacture of a shadow mask - Google Patents
Fe-Co-Ni alloy and use for the manufacture of a shadow mask Download PDFInfo
- Publication number
- US20020043306A1 US20020043306A1 US09/940,481 US94048101A US2002043306A1 US 20020043306 A1 US20020043306 A1 US 20020043306A1 US 94048101 A US94048101 A US 94048101A US 2002043306 A1 US2002043306 A1 US 2002043306A1
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- United States
- Prior art keywords
- alloy
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- equal
- chemical composition
- shadow mask
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
- C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
- H01J29/07—Shadow masks for colour television tubes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
Fe—Ni—Co alloy whose chemical composition contains, by weight: 32%≦Ni≦34%, 3.5%≦Co≦6.5%, 0%≦Mn≦0.1%, 0%≦Si≦0.1%≦0%≦Cr≦0.1%, 0.005%≦C≦0.02%, S≦0.001%, 0.0001%≦Ca≦0.002%, 0.0001%≦Mg≦0.002%, the substantial remainder preferably being iron and impurities resulting from smelting; the chemical composition of the alloy furthermore satisfying the relationships: Co+Ni≦38.5%, Co+0.5×Ni≧20%, Co+5×Ni≧165.5% and S≦0.02≦Mn+0.8×Ca+0.6×Mg. Use of the alloy for the manufacture of a shadow mask for a display cathode ray tube.
Description
- The present invention relates to an Fe—Ni—Co alloy having a low coefficient of expansion, as well as to its use in the manufacture of a shadow mask for, e.g., a display cathode ray tube.
- Certain Fe—Ni—Co alloys having a low coefficient of expansion, commonly called SUPERINVAR, are known in the art. These alloys are used especially for the manufacture of shadow masks as described, for example, in European Patent Application EP 0534460 which proposes to use, for the manufacture of shadow masks, an Fe—Ni—Co alloy containing, by weight, in addition to iron, from 28% to 34% of nickel, from 2% to 7% of cobalt, from 0.1% to 1% of manganese, less than 0.1% of silicon and less than 0.01% of carbon, the rest being impurities resulting from smelting. However, this alloy has the drawback of sometimes having a martensitic transformation start point MS close to room temperature so that, either when forming the shadow mask or when storing it at low temperature, the martensitic transformation starts, causing permanent deformation of the shadow mask. In addition, especially because of the manganese content, which is regarded as being necessary for the alloy to exhibit good hot-rolling behaviour, the alloy has a coefficient of expansion which is too high to sufficiently reduce the defect of local doming of the shadow mask.
- One object of the present invention is to provide an Fe—Ni—Co alloy which has a martensitic transformation start point of less than −50° C., an average coefficient of thermal expansion between 20° C. and 100° C. of less than or equal to 0.7×10−6/° K and a mean coefficient of thermal expansion between 80° C. and 130° C. of less than or equal to 1×10−6/° K. Another object is the provision of shadow masks comprising this alloy. Other objects will become apparent upon an appreciation of the entire invention.
- These objects are provided by an Fe—Ni—Co alloy whose chemical composition comprises, by weight based on total weight:
- 32%≦Ni≦34%
- 3.5%≦Co≦6.5%
- 0%≦Mn≦0.1%
- 0%≦Si≦0.1%
- 0%≦Cr≦0.1%
- 0.005%≦C≦0.02%
- S≦0.001%
- 0.0001%≦Ca≦0.002%
- 0.0001%≦Mg≦0.002%
- the substantial remainder (at least 50%, preferably at least 55%) being iron and impurities resulting from smelting; the chemical composition of the alloy furthermore satisfying the relationships:
- Co+Ni≦38.5%
- Co+0.5×Ni≧20%
- Co+5×Ni≧165.5%
- and
- S≦0.02×Mn+0.8×Ca+0.6×Mg
- Preferably, the copper, molybdenum, vanadium and niobium contents are each less than 0.1 wt %. Even better, the sum of the manganese, silicon, chromium, copper, molybdenum, vanadium and niobium contents is less than 0.30 wt %.
- Additionally, it is preferable that the oxygen content be less than or equal to 0.01 wt %, and/or the nitrogen content be less than or equal to 0.005 wt % and/or the phosphorus content be less than or equal to 0.005 wt %.
- The use of the above alloy according to the invention for the manufacture of a shadow mask, as well as the shadow mask thus obtained, are also part of the invention.
- Although it is generally known and accepted that the deformations of a shadow mask are principally generated by moderate heating up to a temperature of less than 100° C. and typically a temperature of 80° C., the inventors believe, based on their study, that image defects are caused by local heating of the shadow mask at temperatures which might be as high as 130° C. In order to reduce image defects as far as possible, the inventors discovered that it is necessary to use, for the manufacture of a shadow mask, an alloy which not only has a mean coefficient of expansion between 20° C. and 100° C. which is low, preferably as low as possible, but which also has a mean coefficient of expansion between 80° C. and 130° C. which is low, again preferably as low as possible. In addition, this alloy should have a micrographic structure which is stable down to a sufficiently low temperature, that is to say down to at least −50° C.
- The alloy according to the invention satisfying the above objects is an Fe—Ni—Co alloy whose chemical composition is adjusted so that, simultaneously, its mean coefficient of expansion between 20° C. and 100° C. is less than or equal to 0.7×10−6/° K, its mean coefficient of expansion between 80° C. and 130° C. is less than or equal to 1×10−6/° K and its MS point is less than −50° C.
- The chemical composition of the invention alloy preferably comprises, by weight based on total weight, at least 32% and at most 34% of nickel, as well as at least 3.5% and at most 6.5% of cobalt, the nickel and cobalt contents being such that:
- Co+Ni≦38.5%
- so that, it is believed, the mean coefficient of expansion of the alloy between 20° C. and 100° C. is less than or equal to 0.7×10−6/° K;
- Co+0.5×Ni≧20%
- so that, it is believed, the mean coefficient of expansion between 80° C. and 130° C. is less than 1×10−6/° K;
- Co+5×Ni≧165.5%
- so that, it is believed, the MS point is less than −50° C.
- It is also believed that in order for the mean coefficient of expansion between 20° C. and 100° C. to be less than or equal to 0.7×10−6/° K, it is preferable for each of the manganese, silicon and chromium contents to be less than or equal to 0.1%.
- In order for the MS point to remain below −50° C., it is believed that the alloy should contain at least 0.005% of carbon; however, the carbon content should not exceed 0.02% so that there is no deterioration in the ability to be shaped by drawing.
- However, industrial alloys always contain residual elements such as copper, molybdenum, vanadium or niobium, and, in order for the coefficient of expansion to be as low as possible, it is desirable for the contents of each of these elements to remain less than or equal to 0.1% and, preferably, for:
- Mn+Si+Cr+Mo+V+Nb+Cu≦0.30%.
- Finally, in order to obtain better hot ductility, it is preferable for the oxygen content to be less than or equal to 0.01%, and/or the nitrogen content to remain less than or equal to 0.005%, and/or the phosphorus content to remain less than or equal to 0.005%.
- With this invention alloy, it is possible to manufacture shadow masks. For one way to do this, the alloy is smelted, cast as an ingot or slab and then hot-rolled in order to form a strip approximately 4 mm thick; the strip is then cold-rolled in order to obtain a cold-rolled strip approximately 0.15 mm thick. This cold-rolled strip has a 0.2% proof stress Rp0.2 at 20° C. of about 600 MPa, which is much too high for allowing easy shaping, and in addition, after machining the mask blanks by chemical cutting, these blanks are subjected to an annealing between 700° C. and 850° C. which brings the 0.2% proof stress Rp0.2 at 20° C. back down to about 320 MPa. Next, each blank is shaped, for example by drawing, in order to obtain a shadow mask.
- By way of nonlimiting example, alloys A to D according to the invention were manufactured, the chemical compositions of which were, in % by weight based on total weight:
Ref Ni Co Mn Si Cr C S Ca Mg Fe A 32.7 4.5 0.06 0.08 0.04 0.014 0.0006 0.0005 0.0015 bal. B 33.5 4.5 0.05 0.08 0.07 0.014 0.0009 0.0012 0.0009 bal. C 33.5 3.5 0.05 0.08 0.05 0.011 0.0007 0.0008 0.0007 bal. D 33.3 4.2 0.05 0.09 0.06 0.018 0.0008 0.0011 0.0011 bal. - The properties of these alloys were:
Rp0.2 Rp0.2 Rp0.2 α α α MPa MPa MPa 20°/100° 20°/80° 80°/130° Ms 20° C. 20° C. 200° C. Ref 10−6/° K. 10−6/° K. 10−6/° K. ° C. work-hardened annealed* annealed* A 0.31 0.23 0.78 −90 615 320 141 B 0.65 0.65 0.80 <−186 615 318 137 C 0.49 0.45 0.90 <−186 607 304 133 D 0.51 0.49 0.77 <−186 629 322 148 - With these alloys, shadow masks were made consisting, in particular, of a foil drilled with holes and shaped by drawing. These shadow masks had an entirely austenitic structure, even after shaping or after storing in a cold environment, and their local doming defect is less than 40% of the local doming defect of shadow masks made of iron-nickel alloy according to the prior art.
- This application is based on French patent application 95 05362 filed May 5, 1995, incorporated herein by reference.
Claims (8)
1. An Fe—Ni—Co alloy whose chemical composition comprises, by weight based on total weight:
32%≦Ni≦34%
3.5%≦Co≦6.5%
0%≦Mn≦0.1%
0%≦Si≦0.1%
0%≦Cr≦0.1%
0.005%≦C≦0.02%
S≦0.001%
0.0001%≦Ca≦0.002%
0.0001%≦Mg≦0.002%
and further comprising iron and impurities resulting from smelting; the chemical composition of the alloy furthermore satisfying the relationships:
Co+Ni≦38.5%
Co+0.5×Ni≧20%
Co+5×Ni≧165.5%
and
S≦0.02≦Mn+0.8×Ca+0.6×Mg.
2. The alloy as claimed in claim 1 , wherein copper, molybdenum, vanadium and niobium contents are each present in less than 0.1%.
3. The alloy as claimed in claim 2 , wherein the sum of the weight percentages of manganese, silicon, chromium, copper, molybdenum, vanadium and niobium is less than, 0.3%.
4. The alloy as claimed in claim 1 , wherein the oxygen content is less than or equal to 0.01%, the nitrogen content is less than or equal to 0.005%, and the phosphorus content is less than or equal to 0.005%.
5. The alloy as claimed in claim 2 , wherein the oxygen content is less than or equal to 0.01%, the nitrogen content is less than or equal to 0.005%, and the phosphorus content is less than or equal to 0.005%.
6. The alloy as claimed in claim 3 , wherein the oxygen content is less than or equal to 0.01%, the nitrogen content is less than or equal to 0.005%, and the phosphorus content is less than or equal to 0.005%.
7. A shadow mask, which comprises at least one foil drilled with holes, said foil comprising an alloy whose chemical composition comprises, by weight based on total weight:
32%≦Ni≦34%
3.5%≦Co≦6.5%
0%≦Mn≦0.1%
0%≦Si≦0.1%
0%≦Cr≦0.1%
0.005%≦C≦0.02%
S≦0.001%
0.0001%≦Ca≦0.002%
0.0001%≦Mg≦0.002%
and further comprising iron and impurities resulting from smelting; the chemical composition of the alloy furthermore satisfying the relationships:
Co+Ni≦38.5%
Co+0.5×Ni≧20%
Co+5×Ni≧165.5%
and
S≦0.02≦Mn+0.8×Ca+0.6×Mg.
8. A method of forming a shadow mask, comprising drilling holes in a foil and drawing said drilled foil, wherein the foil comprises an alloy having a chemical composition which comprises, by weight based on total weight:
32%≦Ni≦34%
3.5%≦Co≦6.5%
0%≦Mn≦0.1%
0%≦Si≦0.1%
0%≦Cr≦0.1%
0.005%≦C≦0.02%
S≦0.001%
0.0001%≦Ca≦0.002%
0.0001%≦Mg≦0.002%
and further comprising iron and impurities resulting from smelting; the chemical composition of the alloy furthermore satisfying the relationships:
Co+Ni≦38.5%
Co+0.5×Ni≧20%
Co+5×Ni≧165.5%
and
S≦0.02×Mn+0.8×Ca+0.6×Mg.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/940,481 US20020043306A1 (en) | 1995-05-05 | 2001-08-29 | Fe-Co-Ni alloy and use for the manufacture of a shadow mask |
US11/230,647 US20060011270A1 (en) | 1995-05-05 | 2005-09-21 | Fe-Co-Ni alloy and use for the manufacture of a shadow mask |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9505362 | 1995-05-05 | ||
FR9505362A FR2733767B1 (en) | 1995-05-05 | 1995-05-05 | FE-CO-NI ALLOY AND USE FOR THE MANUFACTURE OF A SHADOW MASK |
US09/940,481 US20020043306A1 (en) | 1995-05-05 | 2001-08-29 | Fe-Co-Ni alloy and use for the manufacture of a shadow mask |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US64123396A Continuation | 1995-05-05 | 1996-04-30 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/230,647 Continuation US20060011270A1 (en) | 1995-05-05 | 2005-09-21 | Fe-Co-Ni alloy and use for the manufacture of a shadow mask |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020043306A1 true US20020043306A1 (en) | 2002-04-18 |
Family
ID=32095146
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/940,481 Abandoned US20020043306A1 (en) | 1995-05-05 | 2001-08-29 | Fe-Co-Ni alloy and use for the manufacture of a shadow mask |
US11/230,647 Abandoned US20060011270A1 (en) | 1995-05-05 | 2005-09-21 | Fe-Co-Ni alloy and use for the manufacture of a shadow mask |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/230,647 Abandoned US20060011270A1 (en) | 1995-05-05 | 2005-09-21 | Fe-Co-Ni alloy and use for the manufacture of a shadow mask |
Country Status (1)
Country | Link |
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US (2) | US20020043306A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004053179A1 (en) * | 2002-12-12 | 2004-06-24 | Thyssenkrupp Vdm Gmbh | Iron-nickel-cobalt alloy, method for the production and use thereof |
US20110017365A1 (en) * | 2008-04-28 | 2011-01-27 | Canon Kabushiki Kaisha | Alloy and method for producing alloy |
US11371123B2 (en) * | 2017-09-01 | 2022-06-28 | Shinhokoku Material Corp. | Low thermal expansion alloy |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014205532A1 (en) * | 2014-03-25 | 2015-10-01 | MAHLE Behr GmbH & Co. KG | motor vehicle |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4853298A (en) * | 1986-04-08 | 1989-08-01 | Carpenter Technology Corporation | Thermally stable super invar and its named article |
JPS6350446A (en) * | 1986-08-19 | 1988-03-03 | Hitachi Metarupureshijiyon:Kk | Low thermal expansion alloy |
US5164021A (en) * | 1989-11-17 | 1992-11-17 | Yamaha Corporation | Method for manufacturing a shadow mask of a Fe-Ni alloy |
JP2596210B2 (en) * | 1990-10-31 | 1997-04-02 | 日本鋼管株式会社 | Method of preventing adhesion seizure during annealing, Fe-Ni alloy for shadow mask excellent in gas emission, and method for producing the same |
JP2723718B2 (en) * | 1991-09-27 | 1998-03-09 | ヤマハ株式会社 | Fe-Ni-Co alloy for shadow mask |
FR2795431B1 (en) * | 1999-06-22 | 2001-12-07 | Imphy Ugine Precision | FLAT SCREEN COLOR VIEWING CATHODIC TUBE MASKING DEVICE, OF THE TYPE INCLUDING A SUPPORT FRAME FOR TENDERED SHADOW MASK AND TENDER SHADOW MASK |
-
2001
- 2001-08-29 US US09/940,481 patent/US20020043306A1/en not_active Abandoned
-
2005
- 2005-09-21 US US11/230,647 patent/US20060011270A1/en not_active Abandoned
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004053179A1 (en) * | 2002-12-12 | 2004-06-24 | Thyssenkrupp Vdm Gmbh | Iron-nickel-cobalt alloy, method for the production and use thereof |
DE10262032B4 (en) * | 2002-12-12 | 2006-08-24 | Thyssenkrupp Vdm Gmbh | Iron-nickel-cobalt alloy, method of making and using same |
US20110017365A1 (en) * | 2008-04-28 | 2011-01-27 | Canon Kabushiki Kaisha | Alloy and method for producing alloy |
US11371123B2 (en) * | 2017-09-01 | 2022-06-28 | Shinhokoku Material Corp. | Low thermal expansion alloy |
Also Published As
Publication number | Publication date |
---|---|
US20060011270A1 (en) | 2006-01-19 |
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Legal Events
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---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION |