GB750001A - Methods and apparatus for nitriding metallic surfaces - Google Patents
Methods and apparatus for nitriding metallic surfacesInfo
- Publication number
- GB750001A GB750001A GB30440/52A GB3044052A GB750001A GB 750001 A GB750001 A GB 750001A GB 30440/52 A GB30440/52 A GB 30440/52A GB 3044052 A GB3044052 A GB 3044052A GB 750001 A GB750001 A GB 750001A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- ammonia
- articles
- tank
- nitriding
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding 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)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
750,001. Nitriding. UNITED STATES STEEL CORPORATION. Dec. 1, 1952 [March 13, 1952], No. 30440/52. Addition to 749,992. Class 72. Surfaces of metallic articles are nitrided according to claim 1 of the parent Specification by confining the articles in a sealed chamber, adding free ammonia (liquid or vapour) from an external source in amount at least 1 gram per square foot of surface, and heating the chamber to 800‹F. to 1200‹F. while confining the ammonia at a pressure not less than 100 lbs. per sq. in. absolute. As shown, articles 22 are placed in a sealed chamber 12 within a furnace 10 and a supply tank 13, containing both liquid and gaseous ammonia, and having a water jacket 14, is connected by a pipe 15 to the chamber 12. A charge of ammonia is admitted to the chamber under a pressure of 700 lbs./sq. in. and a valve 20 in the pipe 15 closed, the temperature in the furnace is then held at the nitriding temperature. One ammonia supply tank may feed several chambers. The chamber may be exhausted of air before being charged with ammonia. An intermediate tank or reservoir having a water jacket may be interposed between the tank and the chamber, Fig. 3 (not shown) or the ammonia may be fed into a metering device before being charged into the chamber, Figs 4 and 5 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US750001XA | 1952-03-13 | 1952-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB750001A true GB750001A (en) | 1956-06-06 |
Family
ID=22122917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30440/52A Expired GB750001A (en) | 1952-03-13 | 1952-12-01 | Methods and apparatus for nitriding metallic surfaces |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB750001A (en) |
-
1952
- 1952-12-01 GB GB30440/52A patent/GB750001A/en not_active Expired
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