GB1069531A - Apparatus for heat-treating metals employing a carbonizing atmosphere - Google Patents

Apparatus for heat-treating metals employing a carbonizing atmosphere

Info

Publication number
GB1069531A
GB1069531A GB18458/64A GB1845864A GB1069531A GB 1069531 A GB1069531 A GB 1069531A GB 18458/64 A GB18458/64 A GB 18458/64A GB 1845864 A GB1845864 A GB 1845864A GB 1069531 A GB1069531 A GB 1069531A
Authority
GB
United Kingdom
Prior art keywords
furnace
carburizing
compressor
valve
atmosphere
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
GB18458/64A
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.)
Leeds and Northrup Co
Original Assignee
Leeds and Northrup Co
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 Leeds and Northrup Co filed Critical Leeds and Northrup Co
Publication of GB1069531A publication Critical patent/GB1069531A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • C21D1/763—Adjusting the composition of the atmosphere using a catalyst
    • 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
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Furnace Details (AREA)

Abstract

Apparatus for gas carburizing metal workpieces consists of a furnace chamber (which may be resistance heated) having a fan for internal circulation, means including a compressor and filters &c., for externally recirculating the furnace atmosphere and means for introducing controlled amounts of carburizing agent into the gas stream on the inlet side of the compressor. As particularly described, when the furnace chamber (11) (Fig. 1) reaches its operating temperature as determined by a thermocouple (17), a switch (20) is closed whereby a relay (26) is energized, thus activating a compressor (25) which discharges through a catalytic atmosphere generator (52) a mixture of carburizing agent such as natural gas entering through an inlet valve (35) and a throttle valve (41) and air entering through a second inlet valve (46). This continues for a period determined by a timer (55) and such that equilibrium conditions are obtained in the furnace, and its antechamber (12) the effluent gases being burnt during this period. The work is then transferred to the furnace and the flow of gas continued under the control of the timer until equilibrium is regained. Until this stage is reached the supply of carburizing agent is interrupted by intermittently closing the inlet valve (35) by means of a cam operated switch (57, 58) in the valve control circuit, whereby any deposits of carbon on the catalyst are removed. The relay is then de-energized, with the result that control of the incoming carburizing agent passes to a second throttle valve (62), and a two way valve (36) is operated so that the compressor no longer takes in air but recirculates the furnace atmosphere which it now discharges directly into the furnace. This circulation continues until the carbon potential of the furnace reaches a desired level as measured by a suitable detector element (70), which means of a suitable circuit causes the carburizing agent inlet valve (35) to be operated to maintain the carburizing potential at the desired level. The atmosphere generator (52) consists of a tube (80) of suitable refractory material projecting into the furnace and having at its inner end a spirally wound roll of nickel wire (53) which may be surrounded on its cylindrical surface by a thermally insulating layer of woven ceramic fibre.
GB18458/64A 1963-05-09 1964-05-04 Apparatus for heat-treating metals employing a carbonizing atmosphere Expired GB1069531A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US279053A US3252694A (en) 1963-05-09 1963-05-09 Metal treating system

Publications (1)

Publication Number Publication Date
GB1069531A true GB1069531A (en) 1967-05-17

Family

ID=23067460

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18458/64A Expired GB1069531A (en) 1963-05-09 1964-05-04 Apparatus for heat-treating metals employing a carbonizing atmosphere

Country Status (2)

Country Link
US (1) US3252694A (en)
GB (1) GB1069531A (en)

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
DE102008029001B3 (en) * 2008-06-20 2009-09-17 Ipsen International Gmbh Method and device for the heat treatment of metallic materials
DE102009038598A1 (en) 2009-08-26 2011-03-24 Ipsen International Gmbh Process and device for the treatment of process gases for heat treatment of metallic materials / workpieces in industrial furnaces

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116497309B (en) * 2023-05-12 2023-10-20 浙江求精科技有限公司 Passenger car torsion beam heat treatment device and heat treatment process

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1814796A (en) * 1930-04-23 1931-07-14 Dow Chemical Co Autoclave
US2161162A (en) * 1938-01-06 1939-06-06 Leeds & Northrup Co Method of carburizing
US2275106A (en) * 1939-02-20 1942-03-03 Carl I Hayes Circulation of heat treatment atmospheres
US2546013A (en) * 1942-06-19 1951-03-20 Westinghouse Electric Corp Means and method for producing special heat-treating gaseous atmospheres
US2424248A (en) * 1944-03-29 1947-07-22 Francis L Melvill Contacting apparatus
US2550126A (en) * 1945-02-13 1951-04-24 Westinghouse Electric Corp Gas-generator system for producing heat-treating enveloping atmospheres
US2630315A (en) * 1946-05-11 1953-03-03 Surface Combustion Corp Combination heat-treating furnace and gas generator
US2459618A (en) * 1947-07-05 1949-01-18 Westinghouse Electric Corp Heat-treating means utilizing controlled carbonaceous gaseous atmospheres
US2752147A (en) * 1950-12-21 1956-06-26 Leeds & Northrup Co Metallurgical furnace and method of treatment of work
US2873173A (en) * 1955-04-08 1959-02-10 Sunbeam Corp Endothermic gas generator

Cited By (8)

* 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
DE102008029001B3 (en) * 2008-06-20 2009-09-17 Ipsen International Gmbh Method and device for the heat treatment of metallic materials
EP2135961A2 (en) 2008-06-20 2009-12-23 Ipsen International GmbH Method and device for heat treating metallic materials in a protective atmosphere
US8313586B2 (en) 2008-06-20 2012-11-20 Ipsen International, Gmbh Method and device for thermal treatment of metallic materials
DE102009038598A1 (en) 2009-08-26 2011-03-24 Ipsen International Gmbh Process and device for the treatment of process gases for heat treatment of metallic materials / workpieces in industrial furnaces
EP2302081A1 (en) 2009-08-26 2011-03-30 Ipsen International GmbH Method and device for preparing process gases for the thermal treatment of metallic materials/workpieces in industrial ovens
US8333852B2 (en) 2009-08-26 2012-12-18 Ipsen, Inc. Method for conditioning process gases for the heat treatment of metallic work pieces in industrial furnaces
DE102009038598B4 (en) * 2009-08-26 2017-06-22 Ipsen International Gmbh Process and device for the treatment of process gases for heat treatment of metallic materials / workpieces in industrial furnaces

Also Published As

Publication number Publication date
US3252694A (en) 1966-05-24

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