GB787958A - Improvements in methods of forming superficial diffusion alloys on metal pieces and especially refractory metal pieces - Google Patents
Improvements in methods of forming superficial diffusion alloys on metal pieces and especially refractory metal piecesInfo
- Publication number
- GB787958A GB787958A GB36791/54A GB3679154A GB787958A GB 787958 A GB787958 A GB 787958A GB 36791/54 A GB36791/54 A GB 36791/54A GB 3679154 A GB3679154 A GB 3679154A GB 787958 A GB787958 A GB 787958A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chromizing
- parts
- metal pieces
- scouring
- halide
- 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
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
- C23C10/60—After-treatment
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
Chromizing of parts made from an alloy based on Fe and/or Ni and further containing a metal imparting refractory properties viz Cr, Mo, Co, Al, Ti, or Mn, is effected by a halide diffusion process followed by a reheating in a non-chromizing atmosphere to cause Cr introduced into piece to diffuse towards the inner layers. After the chromizing step the halide vapours in the container can be condensed away from the parts so that the rediffusion step can be performed in the same container. The parts preferably are heated before the condensation step to draw off any remnants of liquid or solid halide. The part may further be treated by quenching in an oxidizing bath and briefly heated in a fluorine containing reducing atmosphere at a temperature higher than that necessary to reduce the oxide layer but lower than that at which substantial metal diffusion will take place. The parts may be mechanically shaped before chromizing and then the chromium introduced to produce an alloy which could not have been worked to the shape of the part initially. Before chromizing, any of the metals which form precipitates in the mass of the part can be oxidized out of the part by electro-thermal sodium scouring or sodium scouring or sodium hydride scouring. Silicon may be introduced into the part during the treatment to prevent carbide precipitation.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR787958X | 1953-12-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB787958A true GB787958A (en) | 1957-12-18 |
Family
ID=9219254
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB36791/54A Expired GB787958A (en) | 1953-12-22 | 1954-12-20 | Improvements in methods of forming superficial diffusion alloys on metal pieces and especially refractory metal pieces |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB787958A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3061462A (en) * | 1959-03-26 | 1962-10-30 | Chromalloy Corp | Metallic diffusion processes |
US3061463A (en) * | 1959-03-26 | 1962-10-30 | Chromalloy Corp | Metallic diffusion |
US3096205A (en) * | 1960-05-16 | 1963-07-02 | Chromalloy Corp | Diffusion coating of metals |
US3117846A (en) * | 1960-01-28 | 1964-01-14 | Pfaudler Permutit Inc | Multi layer difusion coatings and method of applying the same |
-
1954
- 1954-12-20 GB GB36791/54A patent/GB787958A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3061462A (en) * | 1959-03-26 | 1962-10-30 | Chromalloy Corp | Metallic diffusion processes |
US3061463A (en) * | 1959-03-26 | 1962-10-30 | Chromalloy Corp | Metallic diffusion |
US3117846A (en) * | 1960-01-28 | 1964-01-14 | Pfaudler Permutit Inc | Multi layer difusion coatings and method of applying the same |
US3096205A (en) * | 1960-05-16 | 1963-07-02 | Chromalloy Corp | Diffusion coating of metals |
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