GB744355A - Improvements in methods and apparatus for the formation of superficial diffusion alloys, in particular chromium alloys - Google Patents

Improvements in methods and apparatus for the formation of superficial diffusion alloys, in particular chromium alloys

Info

Publication number
GB744355A
GB744355A GB12127/52A GB1212752A GB744355A GB 744355 A GB744355 A GB 744355A GB 12127/52 A GB12127/52 A GB 12127/52A GB 1212752 A GB1212752 A GB 1212752A GB 744355 A GB744355 A GB 744355A
Authority
GB
United Kingdom
Prior art keywords
objects
halide
vapours
metal
condensation
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
GB12127/52A
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 GB744355A publication Critical patent/GB744355A/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

Abstract

A halide diffusion process in particular for ferrous objects and especially for the addition of chromium utilising the fluoride is carried out by subjecting the metal object to the action of vapours of at least one halide of the addition metal or metals generated in the enclosure containing the object (which enclosure is externally heated), condensation of the vapours on to the metal objects being prevented. The object is, at and subsequent to the time when the halide vapours are capable of reaching the object, at a temperature not less than that of the coldest part of the enclosure through which the halide vapours must pass to reach the object. Where a regeneration metal is used in contact with the object, this also is protected from the vapours. Three methods of accomplishing this are described, the use of a filter layer to condense the halides, preliminary heating of the object or maintenance of the halide source at a temperature below that of the surface of the object. In the first method where the charge includes light objects and heavier objects, the objects can be so arranged as to allow the light objects to act as the filter layer. The third method can be carried out by separating the halide source from the objects with a thermal screen, by controlled heating giving preference to the objects, or by retarding heating of the halide source by admixture with water. Soiling of the articles and regeneration metal may also occur by condensation after the treatment during the cooling down stage. Three ways of overcoming this difficulty are disclosed. In the first, the quantity of halide is controlled so that by the end of the treatment virtually none is left. Secondly, the halide source is cooled down before the objects and regeneration metal and thirdly condensation may be caused preferentially on a body, in the treatment zone, provided for the purpose. Furnace arrangements are disclosed and illustrated.
GB12127/52A 1951-05-16 1952-05-13 Improvements in methods and apparatus for the formation of superficial diffusion alloys, in particular chromium alloys Expired GB744355A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR744355X 1951-05-16

Publications (1)

Publication Number Publication Date
GB744355A true GB744355A (en) 1956-02-08

Family

ID=9146893

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12127/52A Expired GB744355A (en) 1951-05-16 1952-05-13 Improvements in methods and apparatus for the formation of superficial diffusion alloys, in particular chromium alloys

Country Status (1)

Country Link
GB (1) GB744355A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065108A (en) * 1960-01-07 1962-11-20 Chromalloy Corp Method of applying a chromium coating to high temperature resistant materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065108A (en) * 1960-01-07 1962-11-20 Chromalloy Corp Method of applying a chromium coating to high temperature resistant materials

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