GB1293053A - Method and apparatus for maintaining the composition of a nitriding atmosphere - Google Patents

Method and apparatus for maintaining the composition of a nitriding atmosphere

Info

Publication number
GB1293053A
GB1293053A GB3075570A GB3075570A GB1293053A GB 1293053 A GB1293053 A GB 1293053A GB 3075570 A GB3075570 A GB 3075570A GB 3075570 A GB3075570 A GB 3075570A GB 1293053 A GB1293053 A GB 1293053A
Authority
GB
United Kingdom
Prior art keywords
gas
torr
june
water vapour
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
Application number
GB3075570A
Inventor
Harry Howard Podgurski
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.)
USS Engineers and Consultants Inc
Original Assignee
USS Engineers and Consultants Inc
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 USS Engineers and Consultants Inc filed Critical USS Engineers and Consultants Inc
Publication of GB1293053A publication Critical patent/GB1293053A/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
    • 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

1293053 Gas nitriding steel USS ENG & CONSULTANTS Inc 24 June 1970 [25 June 1969] 30755/70 Heading C7U A mixture of ammonia and hydrogen is recirculated over the steel surface at 475-580‹ C. and atmospheric pressure, ACN and other nitriding inhibitors being removed during recirculation and the partial pressure of water vapour being adjusted to a value between 1 Torr and that which will oxidize the surface. The wet gas is then purged from the work during cooling. The gas may be purified by contact with an aqueous alkaline solution, which may be maintained at an appropriate temperature to maintain the desired partial pressure of water vapour, suitably 1 to 20 torr, in the gas. As illustrated, gas leaving reactor 10 is cooled in heat exchanger 40 and then passes through thermostatically controlled scrubber 44, preferably containing ammonium hydroxide. Fresh gas is introduced through line 34, and pressure maintained constant by bleed valve 51.
GB3075570A 1969-06-25 1970-06-24 Method and apparatus for maintaining the composition of a nitriding atmosphere Expired GB1293053A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83632469A 1969-06-25 1969-06-25

Publications (1)

Publication Number Publication Date
GB1293053A true GB1293053A (en) 1972-10-18

Family

ID=25271720

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3075570A Expired GB1293053A (en) 1969-06-25 1970-06-24 Method and apparatus for maintaining the composition of a nitriding atmosphere

Country Status (4)

Country Link
JP (1) JPS4937498B1 (en)
CA (1) CA933073A (en)
DE (1) DE2030986C3 (en)
GB (1) GB1293053A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133422A (en) * 1982-12-11 1984-07-25 Maschf Augsburg Nuernberg Ag Coating by chemical vapour-phase reaction between workpiece and reactants
EP1707646A1 (en) * 2004-01-20 2006-10-04 Parker Netsushori Kogyo K.K. Method for activating surface of metal member

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012115135A1 (en) * 2011-02-23 2012-08-30 Ｄｏｗａサーモテック株式会社 Nitrided steel member and method for producing same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133422A (en) * 1982-12-11 1984-07-25 Maschf Augsburg Nuernberg Ag Coating by chemical vapour-phase reaction between workpiece and reactants
EP1707646A1 (en) * 2004-01-20 2006-10-04 Parker Netsushori Kogyo K.K. Method for activating surface of metal member
EP1707646A4 (en) * 2004-01-20 2008-09-03 Parker Netsushori Kogyo Kk Method for activating surface of metal member

Also Published As

Publication number Publication date
CA933073A (en) 1973-09-04
DE2030986A1 (en) 1971-01-07
JPS4937498B1 (en) 1974-10-09
DE2030986C3 (en) 1979-05-23
DE2030986B2 (en) 1978-09-07

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee