GB825847A - Improvements in methods of forming superficial diffusion alloys containing chromium - Google Patents

Improvements in methods of forming superficial diffusion alloys containing chromium

Info

Publication number
GB825847A
GB825847A GB4646/56A GB464656A GB825847A GB 825847 A GB825847 A GB 825847A GB 4646/56 A GB4646/56 A GB 4646/56A GB 464656 A GB464656 A GB 464656A GB 825847 A GB825847 A GB 825847A
Authority
GB
United Kingdom
Prior art keywords
fluoride
chromium
product
cementation
weight
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
GB4646/56A
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 GB825847A publication Critical patent/GB825847A/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
    • C23C10/06—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases
    • C23C10/08—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases only one element being diffused
    • C23C10/10—Chromising

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)

Abstract

In a method of forming, on a solid metal body consisting of iron, nickel or cobalt or an alloy of one or more of these metals, a superficial alloy consisting of the metal of the body with an additional metal consisting of chromium with or without aluminium, zirconium or silicon, wherein a cementation product, i.e. a product in the solid or liquid state capable, under the action of heat thereon, of giving off vapours of the fluoride of the additional metal, is heated to form such vapours, and such vapours are brought, as they are formed, into contact with the body without allowing the cementation product to be in contact with the body, a least 80% by weight of the cementation product is constituted by chromium fluoride and the cementation product contains no free chromium. The cementation product may consist of commercial chromium fluoride with (a) 5% by weight of ammonium fluoride, or (b) 10% by weight of hydrofluoric acid and 10% by weight of ammonium fluoride; alternatively, it may contain a chromium halide which is not a fluoride. To form a superficial alloy containing aluminium, zirconium or silicon, alumina, zirconia or silica is added to the cementation product. A mass of additional metal may be placed in the chamber in which treatment is effected and this mass, which is out of contact with the cementation product, may be in contact with the body or may be separated therefrom by a metallic network which surrounds the body. Specification 775,295 also is referred to.
GB4646/56A 1955-02-16 1956-02-14 Improvements in methods of forming superficial diffusion alloys containing chromium Expired GB825847A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR825847X 1955-02-16

Publications (1)

Publication Number Publication Date
GB825847A true GB825847A (en) 1959-12-23

Family

ID=9282533

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4646/56A Expired GB825847A (en) 1955-02-16 1956-02-14 Improvements in methods of forming superficial diffusion alloys containing chromium

Country Status (1)

Country Link
GB (1) GB825847A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008821A1 (en) * 1990-11-10 1992-05-29 MTU MOTOREN- UND TURBINEN-UNION MüNCHEN GMBH Device for coating hollow workpieces by gas diffusion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008821A1 (en) * 1990-11-10 1992-05-29 MTU MOTOREN- UND TURBINEN-UNION MüNCHEN GMBH Device for coating hollow workpieces by gas diffusion
US5439525A (en) * 1990-11-10 1995-08-08 Mtu Motoren- Und Turbinen-Union Muenchen Gmbh Device for coating hollow workpieces by gas diffusion

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