US2235947A - Process for the gaseous cementation of steel pieces - Google Patents

Process for the gaseous cementation of steel pieces Download PDF

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Publication number
US2235947A
US2235947A US261668A US26166839A US2235947A US 2235947 A US2235947 A US 2235947A US 261668 A US261668 A US 261668A US 26166839 A US26166839 A US 26166839A US 2235947 A US2235947 A US 2235947A
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United States
Prior art keywords
cementation
gaseous
gas
pressure
steel pieces
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Expired - Lifetime
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US261668A
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English (en)
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Saives Leon
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Individual
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    • 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

Definitions

  • in gas inlets and outlets are also in the fixed position, and the composition of the gaseous atmosphere will gradually vary throughout the entire path of the gas, from the inlet to the discharge.
  • the pieces which are situated outside this path it will be subjected to a calm atmosphere having slight whirls, and in such places the cementation is imperfect, owing to the exhaustion of the gas.
  • the present invention consists in obtaining, by a static method and without any heated mechpp anism, the homogeneous nature of the gaseous composition throughout the whole of the cementation mume.
  • the frequency of this pulsatory action is sufficiently low in order that at each instant the equilibrium of pressure shall be practically atg; tained at all points of the muffle.
  • the admission 01' gas is sufficiently abrupt in order that the rise or pressure shall be as great as desired.
  • the volume of gas supplied at each pulsation, the time between any two pulsations, and the rapidity of the injection, are regulated according to the volume of the mume, the leakage at the charging door (or at the evacuation conduit), and the supply of gas required for a uniform and homogeneous cementation.
  • the subject-matter of the invention use may be made of various devices adapted to provide a. periodic supply of a large quantity of gas.
  • Fig. i is a diagrammatic view of one form of device for practicing the process of the invention, certain of the parts being shown in full lines and certain other parts shown in section, and
  • Fig. 2 is a similar view of another form of device for practicing the invention.
  • the device which is shown diagrammatically in Fig. 1 comprises a supercompressor I which receives-through the pipe 2--the gas supplied by the preparatory apparatus and delivers this gas into a recipient 3, whose periodic discharge into the cementation muiiie 4 is assured by a gatevalve 5 which is controlled by the maximum pressure prevailing in the recipient 3, or by a clockwork device.
  • a supercompressor I which receives-through the pipe 2--the gas supplied by the preparatory apparatus and delivers this gas into a recipient 3, whose periodic discharge into the cementation muiiie 4 is assured by a gatevalve 5 which is controlled by the maximum pressure prevailing in the recipient 3, or by a clockwork device.
  • the pressure rises rapidly in the interior of the muflie, and then falls more slowly until the next discharge, owing to the exit of the exhausted gas through the evacuation conduit 6 or to leakage which may occur in spite of the tight door I.
  • the recipient 3 is replaced by a compressible rubher bag 8 which is supplied through a gate-valve 9 and discharges through a gate-valve In.
  • the m discharge from the bag may be obtained by compressing the said bag by means of a fluid (compressed air or water under pressure) which is sent around the bag into a recipient containing this latter.
  • the said fluid is delivered into the recipient through a gate-valve l2, and. it is discharged through a gate-valve I3.
  • valves 9 and III on the one hand, and i2 and I3 on the other hand, are automatically controlleid insuch 50 manner (for instance) that the valves 9 and I3 will be opened and the valves in and 12 will be closed during the filling of the bag, and that the valves 9 and I3 will be closed and the valves l0 and I2 opened during the emptying of the bag.
  • valves 9, I0 and l2, l3 may be controlled by electric means or by clockwork; and they may be combined together or assembled in a single apparatus.
  • the step which consists in periodically supplying fresh cementatlon gas under high pressure intermittently to the mume, whereby the pressure in the muille will rise abruptly and will then gradually tall to its initial value whereby fresh cementatlon gas comes in contact with all parts of the surtace 0i 5 the steel articles.

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  • 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)
  • Furnace Details (AREA)
US261668A 1938-03-30 1939-03-13 Process for the gaseous cementation of steel pieces Expired - Lifetime US2235947A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR835931T 1938-03-30

Publications (1)

Publication Number Publication Date
US2235947A true US2235947A (en) 1941-03-25

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ID=9297844

Family Applications (1)

Application Number Title Priority Date Filing Date
US261668A Expired - Lifetime US2235947A (en) 1938-03-30 1939-03-13 Process for the gaseous cementation of steel pieces

Country Status (4)

Country Link
US (1) US2235947A (fr)
DE (1) DE726134C (fr)
FR (1) FR835931A (fr)
GB (1) GB527081A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975083A (en) * 1959-11-05 1961-03-14 William E Engelhard Carburizing procedure

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1041067B (de) * 1955-12-06 1958-10-16 Elino Ind Ofenbau Carl Hanf & Verfahren zum Aufkohlen, Nitrieren oder Karbonitrieren von Stahlteilen
FR2356104A1 (fr) * 1976-06-23 1978-01-20 Alco Standard Corp Procede et dispositif pour faire circuler un gaz de traitement chauffe
CH632013A5 (de) * 1977-09-22 1982-09-15 Ipsen Ind Int Gmbh Verfahren zur gasaufkohlung von werkstuecken aus stahl.
DE3038078A1 (de) * 1980-10-08 1982-05-06 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zum aufkohlen metallischer werkstuecke
DE3038082A1 (de) * 1980-10-08 1982-05-06 Linde Ag, 6200 Wiesbaden Verfahren zum einsatzhaerten metallischer werkstuecke
DE3038081A1 (de) * 1980-10-08 1982-05-06 Linde Ag, 6200 Wiesbaden Verfahren zum aufkohlen und kohlungsneutralen gluehen von werkstuecken
DE3146042A1 (de) * 1981-11-20 1983-05-26 Linde Ag, 6200 Wiesbaden Verfahren zum einsatzhaerten metallischer werkstuecke

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975083A (en) * 1959-11-05 1961-03-14 William E Engelhard Carburizing procedure

Also Published As

Publication number Publication date
DE726134C (de) 1942-10-07
GB527081A (en) 1940-10-02
FR835931A (fr) 1939-01-05

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