GB783953A - Improvements in methods of treating metallic pieces - Google Patents

Improvements in methods of treating metallic pieces

Info

Publication number
GB783953A
GB783953A GB24463/55A GB2446355A GB783953A GB 783953 A GB783953 A GB 783953A GB 24463/55 A GB24463/55 A GB 24463/55A GB 2446355 A GB2446355 A GB 2446355A GB 783953 A GB783953 A GB 783953A
Authority
GB
United Kingdom
Prior art keywords
pieces
atmosphere
treatment
piece
cooled
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
GB24463/55A
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 GB783953A publication Critical patent/GB783953A/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
    • C23C10/12—Chromising of ferrous surfaces

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

783,953. Heat treatment atmospheres. OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AERONAUTIQUES, June 30. 1953 [July 11. 1952; Feb. 4, 1953; March 12. 1953], No. 24463/55. Divided out of 783,951. Class 72 A method of producing a metallic piece which has to undergo at least one main thermal treatment at a temperature between 700‹C. and 1500‹C. followed by a rapid quenching and which is to have a non-oxidized superficial layer comprises heating the piece in a neutral or reducing atmosphere containing at least one fluorine compound and cooling without passing through an atmosphere of a nature other than that specified. As shown, a metal piece may be chromized in a chamber 1 having a removable bottom 2 in a reducing atmosphere containing chromium fluoride. When chromizing is complete the bottom may be moved downwardly and the pieces quenched in a tank 3 containing water and ammonium fluoride. Slight oxidation of the surface may occur due to the action of the water and this may be removed by an electrolytic treatment. In a modification. after the treatment, the centre of the coated body may be dissolved, e.g. in nitric acid, leaving a hollow body. In a further modification, Fig. 5 (not shown) a wire may be passed through a furnace having the required atmosphere and be cooled thereafter in the same atmosphere. The invention may also be carried out on pieces which have previously been coated and cooled or on pieces which have no coating.
GB24463/55A 1952-07-11 1953-06-30 Improvements in methods of treating metallic pieces Expired GB783953A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR783953X 1952-07-11

Publications (1)

Publication Number Publication Date
GB783953A true GB783953A (en) 1957-10-02

Family

ID=9217019

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24463/55A Expired GB783953A (en) 1952-07-11 1953-06-30 Improvements in methods of treating metallic pieces

Country Status (1)

Country Link
GB (1) GB783953A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470035A (en) * 1965-01-13 1969-09-30 Walter Maknis Heat treatment of metal
EP1176225A1 (en) * 2000-07-27 2002-01-30 MTU Aero Engines GmbH Process and apparatus for chromizing the inside surface of an article

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470035A (en) * 1965-01-13 1969-09-30 Walter Maknis Heat treatment of metal
EP1176225A1 (en) * 2000-07-27 2002-01-30 MTU Aero Engines GmbH Process and apparatus for chromizing the inside surface of an article
US6913788B2 (en) 2000-07-27 2005-07-05 Mtu Aero Engines Gmbh Process and apparatus for chroming an inner surface of a component

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