US3737308A - Chromium-iron alloy - Google Patents

Chromium-iron alloy Download PDF

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Publication number
US3737308A
US3737308A US00166218A US3737308DA US3737308A US 3737308 A US3737308 A US 3737308A US 00166218 A US00166218 A US 00166218A US 3737308D A US3737308D A US 3737308DA US 3737308 A US3737308 A US 3737308A
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US
United States
Prior art keywords
alloy
weight
phase
oxide film
content
Prior art date
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Expired - Lifetime
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US00166218A
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English (en)
Inventor
N Iwai
T Kuse
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Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
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Publication date
Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
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    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • C03C27/02—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing by fusing glass directly to metal
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium

Definitions

  • a sealing alloy comprising 15-30% by weight Cr, 0.1-0.9% by weight Ti, 0.15-1.5% by Weight Al, -0.5% by Weight Mo and balance Fe is provided.
  • the oxide film formed on the surface of this alloy has very low electric resistance and therefore electric contact can be estab lished through the oxide film.
  • This invention relates to an alloy which is scalable to soft glass especially is suitable for sealing cathode ray tubes for televisions.
  • an 18 Cr-Fe alloy having a thermal expansion coefiicient of 113x10- cm./cm./ C., which approximates the thermal expansion coefficient of soft glass is known.
  • This alloy is well known as an a type stainless steel, which is designated as SUS 24 in the Japanese Industrial Standards (JIS).
  • SUS 24 approximately corresponds to A181 430 in the American Standard of Testing Material (ASTM).
  • the composition thereof is: 16-18% Cr, not more than 0.12% C, not more than 0.75% Si, not more than 1.00% Mn, not more than 0.04% P, not more than 0.03% S (all by weight) and balance Fe.
  • the SUS 24 alloy after being formed into a desired shape, is subjected to wet hydrogen furnace treatment for -90 minutes under the conditions of 900-1200 C. of furnace temperature and 0-40" C. of hydrogen dew point for the purpose of forming oxide film on the surface thereof.
  • the alloy piece having the oxide film on the surface thereof is scalable to soft glass.
  • the alloy of this invention is characterized by comprising -30% by weight Cr, 0.1-0.9% by weight Al, 0-0.5% by weight Mo and balance Fe.
  • the alloy of this invention having such a composition not only overcomes the above-mentioned defects of the prior art alloy but provides a strong bond between the oxide film formed on the surface of the alloy and soft glass.
  • FIG. 1 is a phase diagram of the Fe-Cr system
  • FIG. 2 is a graph showing the relation between the Cr content and the thermal expansion coefficient of the alloy of this invention.
  • FIG. 3 is a graph showing the relation between the Cr content and the mechanical properties of the alloy of this invention.
  • the thermal expansion coefficient of the-Cr-Fe alloys decreases as the Cr content increases. It is learned from FIG. 2 that the Cr-Fe alloy the thermal expansion coefficient of which approximates the thermal expansion coefiicient of soft glass (x10- x10 cm./cm./ C.) contains 15-30% by weight of Cr. It will be noted that if the Cr content is increased as shown in FIG. 1, for example, to 42-48% by weight, then a a phase will be precipitated from a phase, resulting in the Cr-Fe alloy being brittle. Therefore, a Cr-Fe alloy the Cr content of which is too high is not glass-scalable. The relation between the Cr content and the mechanical properties of the alloy is shown in detail in FIG. 3.
  • the SUS 24 alloy is disadvantageous in that precipitation of 'y phase out of a phase easily occurs when heat is applied thereto as referred to in the above. It is known that such precipitation lowers thermal expansion coefficient. That is, if such precipitation takes place in the alloy, the difference of the thermal expansion coeflicients between the alloy and the glass increases leading to cracking of the glass.
  • the alloy of this invention as represented by Sample No. 4 overcomes the defects of the alloy of Sample 1 with respect to all of (1) bonding between the oxide film and the metal substrate, (2) electric resistance of the 1 oxide film and (3) phase transformation.
  • the alloy of Sample 2 is a SUS 24 to which 0.10.9% by weight titanium is added. The addition of Ti eliminates phase transformation, but does not improve two other defects.
  • the alloy of Sample 3 which is a SUS 24 alloy containing Al shows remarkable improvement in the bonding between the oxide film and the metal substrate, but shows still high electric resistance of the oxide film.
  • the alloy of this invention may further contain Mn and Si. But these elements should preferably be not more than 1.00% by weight for Mn and not more than 0.75% by weight for Si in content as well as in the case of the SUS 24 alloy.
  • the carbon content should be as low as possible, preferably not more than 0.1% by weight.
  • This invention has been illustrated with respect to the SUS 24 alloy which is a known alloy, the Cr content of which is within the scope of this invention, for the convenience of easier understanding.
  • the purpose of this invention can also be achieved by an alloy which is a SUS 27 alloy (SUS 24 plus 8-11% by Weight Ni) or a SUS 29 (SUS 24 plus 913% by weight Ni and Ti) to which 0.l0.9% by weight Ti and 0.151.5% by weight Al and 0-0.5% by weight Mo, which characterize this invention, are added.
  • SUS 27 and SUS 29 approximately correspond respectively to A181 304 and A181 321 in the American Standard of Testing Material (ASTM).
  • ASTM American Standard of Testing Material
  • the electric resistance of the oxide film of the alloy of this invention for sealing soft glass is extremely low.
  • this alloy is used as the material for supporters of a shadow mask of a colour cathode ray tube, a remarkable advantage that the shadow mask and the fluorescent film on the inside surface of the face plate can be made equipotential is achieved.
  • An alloy sealable to glass consisting essentially of 15 30% by weight Cr, 0.l0.9% by weight Ti, 0.15- 1.5 -by weight Al, up to 0.5% by Weight Mo and the balance Fe.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Ceramic Engineering (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US00166218A 1970-07-22 1971-07-26 Chromium-iron alloy Expired - Lifetime US3737308A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45063564A JPS493722B1 (xx) 1970-07-22 1970-07-22

Publications (1)

Publication Number Publication Date
US3737308A true US3737308A (en) 1973-06-05

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Family Applications (1)

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US00166218A Expired - Lifetime US3737308A (en) 1970-07-22 1971-07-26 Chromium-iron alloy

Country Status (6)

Country Link
US (1) US3737308A (xx)
JP (1) JPS493722B1 (xx)
DE (1) DE2136094A1 (xx)
FR (1) FR2103312A5 (xx)
GB (1) GB1313630A (xx)
NL (1) NL7110077A (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020134700A1 (en) * 2001-03-23 2002-09-26 Yoshiaki Toguchi Connection structure of storage compartment
US20100119740A1 (en) * 2008-10-17 2010-05-13 Electronics Packaging Solutions, Inc. Glass-to-metal bond structure
US9328512B2 (en) 2011-05-05 2016-05-03 Eversealed Windows, Inc. Method and apparatus for an insulating glazing unit and compliant seal for an insulating glazing unit
US9540863B2 (en) 2010-06-02 2017-01-10 Eversealed Windows, Inc. Multi-pane glass unit having seal with adhesive and gas-restrictive coating layer
US9546513B2 (en) 2013-10-18 2017-01-17 Eversealed Windows, Inc. Edge seal assemblies for hermetic insulating glass units and vacuum insulating glass units

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS518806B2 (xx) * 1972-04-06 1976-03-22
JPH0665737B2 (ja) * 1986-05-13 1994-08-24 日新製鋼株式会社 ガラス封着用金属板
FR2778673B1 (fr) * 1998-05-18 2000-06-23 Usinor Acier inoxydable ferritique utilisable notamment pour la fabrication de pieces de scellement verre metal

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020134700A1 (en) * 2001-03-23 2002-09-26 Yoshiaki Toguchi Connection structure of storage compartment
US20100119740A1 (en) * 2008-10-17 2010-05-13 Electronics Packaging Solutions, Inc. Glass-to-metal bond structure
US9540863B2 (en) 2010-06-02 2017-01-10 Eversealed Windows, Inc. Multi-pane glass unit having seal with adhesive and gas-restrictive coating layer
US9328512B2 (en) 2011-05-05 2016-05-03 Eversealed Windows, Inc. Method and apparatus for an insulating glazing unit and compliant seal for an insulating glazing unit
US10119327B2 (en) 2011-05-05 2018-11-06 Astravac Glass, Inc. Method and apparatus for an insulating glazing unit and compliant seal for an insulating glazing unit
US11035168B2 (en) 2011-05-05 2021-06-15 Astravac Glass, Inc. Method and apparatus for an insulating glazing unit and compliant seal for an insulating glazing unit
US9546513B2 (en) 2013-10-18 2017-01-17 Eversealed Windows, Inc. Edge seal assemblies for hermetic insulating glass units and vacuum insulating glass units

Also Published As

Publication number Publication date
DE2136094A1 (de) 1972-01-27
JPS493722B1 (xx) 1974-01-28
NL7110077A (xx) 1972-01-25
GB1313630A (en) 1973-04-18
FR2103312A5 (xx) 1972-04-07

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