GB1229783A - - Google Patents

Info

Publication number
GB1229783A
GB1229783A GB1229783DA GB1229783A GB 1229783 A GB1229783 A GB 1229783A GB 1229783D A GB1229783D A GB 1229783DA GB 1229783 A GB1229783 A GB 1229783A
Authority
GB
United Kingdom
Prior art keywords
july
metal
compositions
liquid medium
boron trioxide
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
Application number
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 filed Critical
Publication of GB1229783A publication Critical patent/GB1229783A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemically Coating (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

1,229,783. Coated metal. FOSECO INTERNATIONAL Ltd. 5 July, 1968 [7 July, 1967], No. 31372/67. Heading B2E. [Also in Division C7] Surface oxidation of metal articles during heat-treatment is reduced or inhibited by applying to the metal surface a composition carried in a liquid medium and comprising (a) boron trioxide or a material which will yield boron trioxide at the heat-treatment temperature, eg. boric acid, and (b) up to 15% by weight of a mixture of polyvinyl acetate and bentonite. The liquid medium may be water or an alcohol. The composition may also comprise alumina; silica, e.g. as silica flour, powdered glass or a silicate frit; a ceramic frit; a suspension agent, e.g. a montmorillonite gel; an adhesive, e.g. a gum or resin; and thickening or thinning agents. After heating, the compositions may be removed from the metal surface by spraying water thereon, or they may act as a lubricant during subsequent hot working. The compositions may also be used during annealing or tempering operations, or in carburising to mask parts of workpieces which are not to be carburised.
GB1229783D 1967-07-07 1967-07-07 Expired GB1229783A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3137267 1967-07-07

Publications (1)

Publication Number Publication Date
GB1229783A true GB1229783A (en) 1971-04-28

Family

ID=10322120

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1229783D Expired GB1229783A (en) 1967-07-07 1967-07-07

Country Status (1)

Country Link
GB (1) GB1229783A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2204711A1 (en) * 1972-10-26 1974-05-24 United Kingdom Government
WO1999067431A1 (en) * 1998-06-22 1999-12-29 Rosario Muto Composition for removing oxides in alloys of precious metals or similar

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2204711A1 (en) * 1972-10-26 1974-05-24 United Kingdom Government
WO1999067431A1 (en) * 1998-06-22 1999-12-29 Rosario Muto Composition for removing oxides in alloys of precious metals or similar

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years