GB783954A - Improvements in or relating to methods of producing diffusion alloy coatings on metals - Google Patents

Improvements in or relating to methods of producing diffusion alloy coatings on metals

Info

Publication number
GB783954A
GB783954A GB2205/57A GB220557A GB783954A GB 783954 A GB783954 A GB 783954A GB 2205/57 A GB2205/57 A GB 2205/57A GB 220557 A GB220557 A GB 220557A GB 783954 A GB783954 A GB 783954A
Authority
GB
United Kingdom
Prior art keywords
oxide
piece
metal
finely divided
diffusion alloy
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
GB2205/57A
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.)
Office National dEtudes et de Recherches Aerospatiales ONERA
Original Assignee
Office National dEtudes et de Recherches Aerospatiales ONERA
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 Office National dEtudes et de Recherches Aerospatiales ONERA filed Critical Office National dEtudes et de Recherches Aerospatiales ONERA
Publication of GB783954A publication Critical patent/GB783954A/en
Expired legal-status Critical Current

Links

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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/34—Embedding in a powder mixture, i.e. pack cementation
    • C23C10/36—Embedding in a powder mixture, i.e. pack cementation only one element being diffused
    • C23C10/38—Chromising
    • C23C10/40—Chromising of ferrous surfaces
    • C23C10/42—Chromising of ferrous surfaces in the presence of volatile transport additives, e.g. halogenated substances
    • 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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/34—Embedding in a powder mixture, i.e. pack cementation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)

Abstract

A method of forming a diffusion alloy coating on a metallic piece comprises heating the piece in the presence of at least one fluoride of an addition metal and also in the presence of a material comprising a finely divided metal oxide, with or without a finely divided metal, the oxide having the following properties: (a) it is refractory; (b) it does not readily react with halogen compounds; (c) it is not readily reducible by hydrogen in acid or halogen containing media; (d) it has a grain size such that gases may circulate but it does not constitute a considerable thermal mass; (e) it is practically non-porous so as not to retain any halide; (f) it does not form alloys with the metal of the piece or the addition metal having melting points lower than those of the pure metals. The material may be one of thorium oxide, chromium oxide, titanium oxide, or beryllium oxide, and may also contain finely divided molybdnum or tungsten. The method may be applied to pieces made by powder metallurgy. The method is stated to prevent the formation of adhesions on the piece and, since the material is a bad conductor of heat, the piece may be cooled slowly.
GB2205/57A 1952-07-11 1953-06-30 Improvements in or relating to methods of producing diffusion alloy coatings on metals Expired GB783954A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR783954X 1952-07-11

Publications (1)

Publication Number Publication Date
GB783954A true GB783954A (en) 1957-10-02

Family

ID=9217021

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2205/57A Expired GB783954A (en) 1952-07-11 1953-06-30 Improvements in or relating to methods of producing diffusion alloy coatings on metals

Country Status (1)

Country Link
GB (1) GB783954A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4904500A (en) * 1987-06-08 1990-02-27 Exxon Research And Engineering Company Diffusion of elements into steel by catalyzed oxide reduction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4904500A (en) * 1987-06-08 1990-02-27 Exxon Research And Engineering Company Diffusion of elements into steel by catalyzed oxide reduction

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