US957193A - Process of preventing surface oxidation of resistance-conductors. - Google Patents

Process of preventing surface oxidation of resistance-conductors. Download PDF

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Publication number
US957193A
US957193A US48477309A US1909484773A US957193A US 957193 A US957193 A US 957193A US 48477309 A US48477309 A US 48477309A US 1909484773 A US1909484773 A US 1909484773A US 957193 A US957193 A US 957193A
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US
United States
Prior art keywords
resistance
conductors
surface oxidation
conductor
preventing surface
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
Application number
US48477309A
Inventor
John T H Dempster
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US48477309A priority Critical patent/US957193A/en
Application granted granted Critical
Publication of US957193A publication Critical patent/US957193A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/26—Deposition of carbon only
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5001—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with carbon or carbonisable materials

Definitions

  • This invention relates to means for preventing surface oxidation of resistance conductoru to be used in electric heaters and the like and has for its object the provision of means whereby the oxid is prevented from forming when the conductor is heated.
  • One of the objects of my invention is to prevent formation of this oxid.
  • This process is adapted for use in cases where the res1stance conductor is to be sealed in, as for instance where the conductor, in contact with mica, is cast into a body of metal. In this case it is found that a small amount of oxygen 15 always retained by the mica or Specification of Letters Patent.
  • the particular material which I have found to serve the-purpose is carbon, in the form of paraflin or lampblack, which is suspended in some volatile liquid, as for instance, turpentine or gasolene.
  • the lampblack may be mixed to form a paint, which may be laid on the mica next to the conductor, so that when the conductor is heated by passing current through it, or during the casting-in process, the carbon will combine with the oxygen and form carbon dioxid, and the surface oxidation of the conductor be prevented

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Paints Or Removers (AREA)

Description

UNITED STATES PATENT OFFICE.
JOHN T. H. DEMPSTER, 0F SCHENECTADY, NEW YORK, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.
PROCESS OF PREVENTING SURFACE OXIDATION OF RESISTANCE-CONDUCTORS.
No Drawing.
To all whom it may concern:
Be it known that I, JOHN T. H. DEMP- srnn, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Processes of Preventing Surface Oxidation of Resistance-Conductors, of which the following is a specification.
This invention relates to means for preventing surface oxidation of resistance conductoru to be used in electric heaters and the like and has for its object the provision of means whereby the oxid is prevented from forming when the conductor is heated.
In the construction of electric heaters and the like, high resistance conductors are frequently used, containing metal which forms an oxid on the conductor. This oxid has been found in some cases to attack the mica or other insulating material with which it is in contact when the conductor reaches a high temperature. This is particularly true of certain resistance conductors containing iron, as for instance an alloy of iron, nickel and chormium. A resistance conductor of this composition, when heated, forms an oxid or scale which has been found to combine with mica to form a low melting point mixture.
One of the objects of my invention, therefore, is to prevent formation of this oxid.
In carrymg out my invention, I interpose between the resistance conductor and the mica a layer or film of easily oxidizable material which combines with the oxygen instead. of combining with the metal. This process is adapted for use in cases where the res1stance conductor is to be sealed in, as for instance where the conductor, in contact with mica, is cast into a body of metal. In this case it is found that a small amount of oxygen 15 always retained by the mica or Specification of Letters Patent.
Application filed March 20, 1909. Serial No. 484,773.
Patented May 10, 19MB.
around the conductor. By placing an oxidizable substance next to the mica, this oxygen combines with the substance and prevents surface oxidation.
The particular material which I have found to serve the-purpose is carbon, in the form of paraflin or lampblack, which is suspended in some volatile liquid, as for instance, turpentine or gasolene. The lampblack may be mixed to form a paint, which may be laid on the mica next to the conductor, so that when the conductor is heated by passing current through it, or during the casting-in process, the carbon will combine with the oxygen and form carbon dioxid, and the surface oxidation of the conductor be prevented While I have described my invention as employing a specific material and as operating in a definite manner in accordance with the patent statutes, it should be understood that I do not limit In invention thereto, since various modifications thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.
What I claim as new and desire to secure by Letters Patent of the United States, is
' 1. The process of treating resistance conductors to prevent initial oxidation, which consists in applying thereto a readily 0x1- dizable substance.
2. The process of treating resistance conductors to prevent initial oxidation, which consists in applying thereto a coating of carbon.
In witness whereof, I have hereunto set my hand this 19th day of March, 1909.
\ JOHN T. H. DEMPSTER.
Witnesses:
HELEN Onrono, MARGARET E. WOOLLEY.
US48477309A 1909-03-20 1909-03-20 Process of preventing surface oxidation of resistance-conductors. Expired - Lifetime US957193A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US48477309A US957193A (en) 1909-03-20 1909-03-20 Process of preventing surface oxidation of resistance-conductors.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US48477309A US957193A (en) 1909-03-20 1909-03-20 Process of preventing surface oxidation of resistance-conductors.

Publications (1)

Publication Number Publication Date
US957193A true US957193A (en) 1910-05-10

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US48477309A Expired - Lifetime US957193A (en) 1909-03-20 1909-03-20 Process of preventing surface oxidation of resistance-conductors.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080251428A1 (en) * 2003-06-12 2008-10-16 Axiom Process Limited Screening system
US20090308819A1 (en) * 2003-06-12 2009-12-17 Axiom Process Ltd. Screening system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080251428A1 (en) * 2003-06-12 2008-10-16 Axiom Process Limited Screening system
US20090308819A1 (en) * 2003-06-12 2009-12-17 Axiom Process Ltd. Screening system
US8453844B2 (en) 2003-06-12 2013-06-04 Axiom Process Ltd. Screening system

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