US2240063A - Alloys for metal to glass seals - Google Patents
Alloys for metal to glass seals Download PDFInfo
- Publication number
- US2240063A US2240063A US355668A US35566840A US2240063A US 2240063 A US2240063 A US 2240063A US 355668 A US355668 A US 355668A US 35566840 A US35566840 A US 35566840A US 2240063 A US2240063 A US 2240063A
- Authority
- US
- United States
- Prior art keywords
- metal
- alloy
- glass
- alloys
- beryllium
- Prior art date
- 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.)
- Expired - Lifetime
Links
- 229910045601 alloy Inorganic materials 0.000 title description 48
- 239000000956 alloy Substances 0.000 title description 48
- 229910052751 metal Inorganic materials 0.000 title description 44
- 239000002184 metal Substances 0.000 title description 44
- 239000011521 glass Substances 0.000 title description 26
- 229910052790 beryllium Inorganic materials 0.000 description 27
- 239000011651 chromium Substances 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 17
- 229910052782 aluminium Inorganic materials 0.000 description 15
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 15
- 229910052759 nickel Inorganic materials 0.000 description 13
- 239000003795 chemical substances by application Substances 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 238000004881 precipitation hardening Methods 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- -1 iron group metals Chemical class 0.000 description 4
- 229910052752 metalloid Inorganic materials 0.000 description 4
- 150000002738 metalloids Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000007792 addition Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000005355 lead glass Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 241000287181 Sturnus vulgaris Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910000892 beryllide Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12937—Co- or Ni-base component next to Fe-base component
Definitions
- Patented Apr. 29, 1941 stares PATENT QFFlCE ALLOYS FOR METAL 1'0 GLASS SEALS Victor Allen, Madison, and Charles P. Marsden,
- This invention relates to metallurgy and more particularly to the metallurgy of fir-containing alloys of the iron group metals and to a method of degasifying the same without deleteriously affecting the adherence and the chemical and physical properties of the surface oxide film on said alloys thereby to better condition the same for use in the forming of metal to glass seals.
- One of the objects of the present invention is to provide an improved method for degasifying said alloys. Another object is to provide a degasified alloy product having a surface oxide film that is firmly adherent to the metal surface and capable of forming a gas impervious seal with glass. Still another object is to provide a Cr-containing alloy of the iron group metals adapted for use in the forming of metal to glass seals. Another object is to provide an improved metal to glass seal- Other objects and advantages will be ap of the wire must be provided with anadherent film of oxide to securely bind the glass and metal surfaces together and moreover the oxide film and the metal must be substantially free of gas and of compounds reactive with the glass to form gaseous products at the temperatures employed in the forming of the seal.
- surface oxide film formed subsequently on the solidified degasified alloy prior to the forming of the metal to glass seal is comprised at least in part of the oxide compounds of the alloyed percentages of degasifier agents remaining in the alloy and we have found that the presence of these oxide compounds of the degasifier agent materially alters the adherence and the chemical and physical properties of the normal Cr.Ni.Fe oxide film present on the surface of the alloy and the sealing properties of the film to glass.
- the chromium-containing alloy of the iron group metals as for example the ironchromium-nickel alloy above noted as being comprised of Cr 5-6%, Ni 42-43%, balance Fe, is produced in the customary manner by first forming a, molten substantially pure iron bath and adding the required percentages of nickel and chromium thereto. Considerable care must be taken to eliminate from the bath substantially all associated metal and metalloid impurities. In commercial practice, however, fractional percentages of the elements carbon, sulfur, phosphorus, manganese, boron, titanium and silicon will usually be pre'sent in the alloy, each in amounts not exceeding about 20%.
- beryllium is added in an amount at least suffiskimmed off from the molten metal and the degasified and scorified metal is cast into ingots.
- the cast metal then is worked down to desired wire sizes as heretofore practiced in the art, with the exception that prior to any cold mechanical deformation the metal must be annealed at temperatures approximating 7Q0-900 C. for a time intervalrequired to effect solution of the beryllium content and then rapidly cooled to atmospheric temperatures to retain the beryllium in solid solution. Extensive cold mechanical deformation may then be effected without difficulty.
- the molten alloy may be degasified with aluminum prior to the addition of the beryllium thereto, thereby effecting a material sav ing in the amount of the beryllium employed.
- degasifying agents such as Mn, Si, Ti, Zr, B and the like are not to be considered substantial equivalents for Al in the present invention as they have been found to be detrimental to the adherence and glass scaling properties of the normal oxide film of these alloys when used either alone ,or in combination with beryllium.
- the Cr content is preferably lowered to about 5% and with Be as low as 25% the Cr content may be as high as 5.75% but is within the range 5.255.50%.
- the aluminum content of the degasified and solidified alloy should not exceed about .25%, and preferably is within the range .10 to .20%. With this aluminum content, we have found that as low as .30% Be will produce substantially equivalent precipitation hardening results as .50% Be in the absence of aluminum.
- Our preferred alloy composition for use in the forming of metal to glass seals comprises Cr 5.0- 5.25%, Ni 42%, Be .50%, balance substantially pure Fe.
- Another preferred alloy composition comprises Cr iii-5.25%, Ni 42%, Al '.20%, Be 30%, balance substantially pure Fe. Ineach of these alloys the total carbon, sulfur, phosphorus, manganese and silicon should be present in substantially residual amounts.
- the surface of the alloy is thoroughly cleaned, a relatively thin oxide film is formed thereon, preferably byv heating under oxidizing conditions to elevated temperatures, and glass is fused and pressure molded onto the oxidized metal surface, as heretofore practiced in the art.
- the Be and Al oxides present in the oxide film will be found to be nondeleterious to the adherence of the film to the metal surface and to the sealing properties of the film with the glass.
- the presence of the Be in the metal inhibits the evolution of gas from the metal at the sealing temperatures employed and it will be found that the sealing temperature employed is sufficientto induce precipitation hardening of the metal by the formation of Ni and Cr beryllide compounds.
- the alloy prior to scaling into glass should be subjected to a Be-solutioning heat treatment at temperatures within the range 700-900 C. followed by quick cooling.
- Such heat treatment may be 'done under oxidizing conditions, if desired, to simultaneously produce on the surface of the metal the desired thickness and character of oxide film best adapted for sealing.
- the method of forming a substantially gasfree alloy comprised of Cr 56%, Ni 42-43%, balance substantially all iron comprises forming a molten bath comprised of the said constituents in the desired percentages and adding aluminum and beryllium thereto each in an amount at least sufficient to provide a relatively small alloyed percentage up to about 25% of Al and a relatively larger alloyed percentage up to about 1% of Be in the solidified alloy, treating the molten alloy with a flux to remove therefrom the Al and Be compounds formed, and then casting and solidifying the alloy.
- an alloy suitable foruse inthe forming of metal to glass seals with lead glass said alloy being comprised of Cr 56%, Ni 42-43%, Be from small but effective amounts up to about 1%, Al from small but effective amounts up to about .25%, the balance of the alloy being substantially all Fe.
- an alloy suitable for use in the forming of metal to glass seals with lead glass said alloy being comprised of Cr 56%, Ni 42%, Al .10-25%, Be .25-.'75%, balance Fe.
- a metal part comprised of Cr 56%, Ni 42%, Al .10-25%, Be .30-.75%, balance Fe.
- balance substantially all Fe which comprises forming a molten bath comprised of the said constituents in the said percentages, adding Al thereto in an amount at least sufficient to provide an alloyed percentage of Al up to about 25% in the solidified metal and then adding Be thereto in an amount at least sufiicient to provide an alloyed percentage of Be up to about 1% in the solidified metal, treating the molten alloy, with a flux to remove therefrom the Al and Be compounds formed during the said additions, and then casting and solidifying the alloy.
- Al in fractional percentages up to about 25%
- Be in fractional percentages up to about 1%
- balance Fe except for residual percentages of metal and metalloid impurities, each not in excess of about 20%.
- a metal part for metal to glass seal said part being comprised of an alloy comprised of Cr 54.25%, Ni 42%; Al 20%, Be 30%, balance substantially all iron except for incidental metal and metalloid impurities each in amounts not in excess of 20%.
Description
Patented Apr. 29, 1941 stares PATENT QFFlCE ALLOYS FOR METAL 1'0 GLASS SEALS Victor Allen, Madison, and Charles P. Marsden,
.ln, Bloomfield, N. 3., assignors to Wilbur B.' a Driver 00., Newark, N. J, a corporation of New Jersey I No Drawing. Application September 6, 1940, Serial No. 355,668
7 Claims.
This invention relates to metallurgy and more particularly to the metallurgy of fir-containing alloys of the iron group metals and to a method of degasifying the same without deleteriously affecting the adherence and the chemical and physical properties of the surface oxide film on said alloys thereby to better condition the same for use in the forming of metal to glass seals.
One of the objects of the present invention is to provide an improved method for degasifying said alloys. Another object is to provide a degasified alloy product having a surface oxide film that is firmly adherent to the metal surface and capable of forming a gas impervious seal with glass. Still another object is to provide a Cr-containing alloy of the iron group metals adapted for use in the forming of metal to glass seals. Another object is to provide an improved metal to glass seal- Other objects and advantages will be ap of the wire must be provided with anadherent film of oxide to securely bind the glass and metal surfaces together and moreover the oxide film and the metal must be substantially free of gas and of compounds reactive with the glass to form gaseous products at the temperatures employed in the forming of the seal.
Heretofore in the art various chromium-containing alloys of the iron group metals have been proposed for use in the forming of metal to glass seals of the various types utilized in the lamp, radio tube, and gaseous conduction and electron discharge device industry, for the reason that chromium alloys are generally characterized by an adherent film of oxide. .One of the most satisfactor'y of such alloys from acoefiicient of ex- ,pansion viewpoint for use with lead glass of the type known in the art by the code numbers G l and G -12, in the forming metal to glass seals teristics of the surface oxide film on the alloy and the adherence'of the film to the metal surface.
We have discovered that degasification of the alloy while in the molten state by the use of metallic degasification agents requires generally the use of a sumcient excess of the agent to provide at least fractional alloyed percentages of the agent in the solidified metal to take care of dissolved gases liberated on solidification. The
surface oxide film formed subsequently on the solidified degasified alloy prior to the forming of the metal to glass seal is comprised at least in part of the oxide compounds of the alloyed percentages of degasifier agents remaining in the alloy and we have found that the presence of these oxide compounds of the degasifier agent materially alters the adherence and the chemical and physical properties of the normal Cr.Ni.Fe oxide film present on the surface of the alloy and the sealing properties of the film to glass.
We have discovered that by. using metallic beryllium as a degasifier agent for such alloys or by using aluminum and beryllium together as degasifier agents, residual alloyed percentages of the same as high as about 1% may be employed without detrimental effect to the sealing prop erties of the surface oxide-film or to the adherence of this film tovthe metal surface and with certain pos'itive benefits thereto. We have further found that the fractional percentages up to about 1% of alloyed beryllium are beneficial as a precipitation hardening agent in the alloy, permitting the use of smaller diameter wires or thinner sheet material than has heretofore been permissible with such type alloys.
' In accordance with the above discoveries, to produce the improved alloy product of the present invention the chromium-containing alloy of the iron group metals, as for example the ironchromium-nickel alloy above noted as being comprised of Cr 5-6%, Ni 42-43%, balance Fe, is produced in the customary manner by first forming a, molten substantially pure iron bath and adding the required percentages of nickel and chromium thereto. Considerable care must be taken to eliminate from the bath substantially all associated metal and metalloid impurities. In commercial practice, however, fractional percentages of the elements carbon, sulfur, phosphorus, manganese, boron, titanium and silicon will usually be pre'sent in the alloy, each in amounts not exceeding about 20%.
To the molten Cr.Ni;Fe alloy thus formed, beryllium is added in an amount at least suffiskimmed off from the molten metal and the degasified and scorified metal is cast into ingots. The cast metal then is worked down to desired wire sizes as heretofore practiced in the art, with the exception that prior to any cold mechanical deformation the metal must be annealed at temperatures approximating 7Q0-900 C. for a time intervalrequired to effect solution of the beryllium content and then rapidly cooled to atmospheric temperatures to retain the beryllium in solid solution. Extensive cold mechanical deformation may then be effected without difficulty.
As a modification of this practice, we have found that the molten alloy may be degasified with aluminum prior to the addition of the beryllium thereto, thereby effecting a material sav ing in the amount of the beryllium employed.
Other degasifying agents such as Mn, Si, Ti, Zr, B and the like are not to be considered substantial equivalents for Al in the present invention as they have been found to be detrimental to the adherence and glass scaling properties of the normal oxide film of these alloys when used either alone ,or in combination with beryllium.
As a specific embodiment of the practice of th present invention, we have found that in the Cr.Ni.Fe alloy containing -6% Cr, 42-43% Ni, balance substantially all iron except for fractional percentages up to about 1% of unavoidable metal and metalloid impurities, beryllium in fractional percentages up to about 1% may be incorporated without detriment to the glass sealing or film adherence properties of the normal oxide film of the alloy. As the beryllium content increases, the precipitation hardening advantage of this constituent increases and we have found that between .50-.75% is the most satisfactory range of beryllium for this result.
We have found it desirable to lower the chromium content of the alloy with increase in the beryllium content in order to maintain the ther-' mal coefiicient of expansion of the 'alloy substantially constant. For example, with Be as high as 1% the Cr content is preferably lowered to about 5% and with Be as low as 25% the Cr content may be as high as 5.75% but is within the range 5.255.50%.
Where the alloy has been degasified with aluminum prior to the addition of beryllium thereto, the aluminum content of the degasified and solidified alloy should not exceed about .25%, and preferably is within the range .10 to .20%. With this aluminum content, we have found that as low as .30% Be will produce substantially equivalent precipitation hardening results as .50% Be in the absence of aluminum.
Our preferred alloy composition for use in the forming of metal to glass seals comprises Cr 5.0- 5.25%, Ni 42%, Be .50%, balance substantially pure Fe. Another preferred alloy composition comprises Cr iii-5.25%, Ni 42%, Al '.20%, Be 30%, balance substantially pure Fe. Ineach of these alloys the total carbon, sulfur, phosphorus, manganese and silicon should be present in substantially residual amounts.
In'the forming of a metal to glass seal utilizing preferably this alloy and lime glass, the surface of the alloy is thoroughly cleaned, a relatively thin oxide film is formed thereon, preferably byv heating under oxidizing conditions to elevated temperatures, and glass is fused and pressure molded onto the oxidized metal surface, as heretofore practiced in the art. The Be and Al oxides present in the oxide film will be found to be nondeleterious to the adherence of the film to the metal surface and to the sealing properties of the film with the glass. The presence of the Be in the metal inhibits the evolution of gas from the metal at the sealing temperatures employed and it will be found that the sealing temperature employed is sufficientto induce precipitation hardening of the metal by the formation of Ni and Cr beryllide compounds. To condition the alloy for the maximum beneficial effects incident to this precipitation hardening, the alloy prior to scaling into glass should be subjected toa Be-solutioning heat treatment at temperatures within the range 700-900 C. followed by quick cooling. Such heat treatment may be 'done under oxidizing conditions, if desired, to simultaneously produce on the surface of the metal the desired thickness and character of oxide film best adapted for sealing.
to glass.
Having hereinabovedescribed the present invention generically and specifically, it is believed apparent that many modifications and departures may be made therein without departing essentially from the nature and scope thereof and all such are contemplated as may fall within the scope of the following claims.
What we claim is:
1. The method of forming a substantially gasfree alloy comprised of Cr 56%, Ni 42-43%, balance substantially all iron which comprises forming a molten bath comprised of the said constituents in the desired percentages and adding aluminum and beryllium thereto each in an amount at least sufficient to provide a relatively small alloyed percentage up to about 25% of Al and a relatively larger alloyed percentage up to about 1% of Be in the solidified alloy, treating the molten alloy with a flux to remove therefrom the Al and Be compounds formed, and then casting and solidifying the alloy.
2. As an article of manufacture, an alloy suitable foruse inthe forming of metal to glass seals with lead glass, said alloy being comprised of Cr 56%, Ni 42-43%, Be from small but effective amounts up to about 1%, Al from small but effective amounts up to about .25%, the balance of the alloy being substantially all Fe.
3. As an article of manufacture, an alloy suitable for use in the forming of metal to glass seals with lead glass, said alloy being comprised of Cr 56%, Ni 42%, Al .10-25%, Be .25-.'75%, balance Fe.
4. In a metal to glass seal, a metal part comprised of Cr 56%, Ni 42%, Al .10-25%, Be .30-.75%, balance Fe.
5. The method of forming a substantially gasfree alloy, comprised of Cr 56%, Ni 42-43%,
balance substantially all Fe which comprises forming a molten bath comprised of the said constituents in the said percentages, adding Al thereto in an amount at least sufficient to provide an alloyed percentage of Al up to about 25% in the solidified metal and then adding Be thereto in an amount at least sufiicient to provide an alloyed percentage of Be up to about 1% in the solidified metal, treating the molten alloy, with a flux to remove therefrom the Al and Be compounds formed during the said additions, and then casting and solidifying the alloy.
v 6. In a metal to glass seaL'a metal part comprised of an alloy comprised of Cr 56%, Ni
42-43%, Al in fractional percentages up to about 25%, Be in fractional percentages up to about 1%, balance Fe except for residual percentages of metal and metalloid impurities, each not in excess of about 20%.
7. A metal part for metal to glass seal, said part being comprised of an alloy comprised of Cr 54.25%, Ni 42%; Al 20%, Be 30%, balance substantially all iron except for incidental metal and metalloid impurities each in amounts not in excess of 20%.
VICTOR. O. ALLEN. CHARLES P. MARSDEN, JR.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US355668A US2240063A (en) | 1940-09-06 | 1940-09-06 | Alloys for metal to glass seals |
US377654A US2240064A (en) | 1940-09-06 | 1941-02-06 | Alloy for metal to glass seals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US355668A US2240063A (en) | 1940-09-06 | 1940-09-06 | Alloys for metal to glass seals |
Publications (1)
Publication Number | Publication Date |
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US2240063A true US2240063A (en) | 1941-04-29 |
Family
ID=23398327
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US355668A Expired - Lifetime US2240063A (en) | 1940-09-06 | 1940-09-06 | Alloys for metal to glass seals |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2502855A (en) * | 1944-10-18 | 1950-04-04 | Sylvania Electric Prod | Preoxidation of stainless steel |
US2722085A (en) * | 1950-11-18 | 1955-11-01 | Hartford Nat Bank & Trust Co | Method of sealing an iron cone to a glass window |
US3865581A (en) * | 1972-01-27 | 1975-02-11 | Nippon Steel Corp | Heat resistant alloy having excellent hot workabilities |
-
1940
- 1940-09-06 US US355668A patent/US2240063A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2502855A (en) * | 1944-10-18 | 1950-04-04 | Sylvania Electric Prod | Preoxidation of stainless steel |
US2722085A (en) * | 1950-11-18 | 1955-11-01 | Hartford Nat Bank & Trust Co | Method of sealing an iron cone to a glass window |
US3865581A (en) * | 1972-01-27 | 1975-02-11 | Nippon Steel Corp | Heat resistant alloy having excellent hot workabilities |
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