DE288162C - - Google Patents

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Publication number
DE288162C
DE288162C DENDAT288162D DE288162DA DE288162C DE 288162 C DE288162 C DE 288162C DE NDAT288162 D DENDAT288162 D DE NDAT288162D DE 288162D A DE288162D A DE 288162DA DE 288162 C DE288162 C DE 288162C
Authority
DE
Germany
Prior art keywords
muffle
gas
cementation
furnace
pipe
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.)
Active
Application number
DENDAT288162D
Other languages
German (de)
Publication of DE288162C publication Critical patent/DE288162C/de
Active legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C8/00Solid 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
    • C23C8/06Solid 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

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

Bei dem vorliegenden Zementationsofen erhält die Muffel zwei durch den Hinterteil des Ofens durchgeführte, mit der Muffel fest verschweißte Rohransätze. Nach Fig. ι beiliegender Zeichnung wird das Gas durch das Rohr α in die Muffel eingeführt, die Rückleitung geschieht durch das Rohr b. Nach Fig. 2 ist ein Doppelrohr vorgesehen, wobei das Gas durch das Innenrohr c in die Muffel eintrittIn the present cementation furnace, the muffle is provided with two pipe sockets which are passed through the rear part of the furnace and are firmly welded to the muffle. According to Fig. Ι the accompanying drawing, the gas is introduced through the tube α into the muffle, the return line occurs through the tube b. According to FIG. 2, a double pipe is provided, the gas entering the muffle through the inner pipe c

ίο und durch den durch das Innenrohr c und Außenrohr d gebildeten Zwischenraum wieder abgeleitet wird. Die Arbeitsweise ist folgende: In einem Ofen mit gasdichter Muffel und möglichst dicht gearbeitetem Verschluß der Arbeitsöffnung wird, nachdem die Muffel (Zementationsraum) durch beliebigen Brennstoff auf 800 bis 900 ° C erhitzt ist, kohlen wasserstoffhaltiges Gas durch Rohr α (Fig. 1) oder c (Fig. 2) in bekannter Weise unter Druck eingeleitet. Der Kohlenstoff scheidet sich vermöge der eigenartigen und neuen Führung des Gasstromes im ganzen Innern der Muffel gleichmäßig verteilt ab. Die Abgase werden rückkehrend durch das Rohr b (Fig. 1) oder durch den durch die Rohre c und ä gebildeten Zwischenraum (Fig. 2) der Feuerung des Ofens zugeleitet. Nach diesem Verfahren wird eine sowohl in bezug auf die Flächen verteilung, als auch auf die Tiefe der gekohlten Schicht möglichst gleichmäßige Zementation erzielt, und zwar weil das Zementationsgas einmal verhältnismäßig lange in der Muffel verbleibt, dann aber auch, weil durch die Gegenströmung eine Abkühlung des Gases vermieden wird.ίο and is diverted again through the space formed by the inner tube c and outer tube d. The method of operation is as follows: In a furnace with a gas-tight muffle and the closure of the working opening as tightly as possible, after the muffle (cementation room) is heated to 800 to 900 ° C by any fuel, carbon hydrogen-containing gas through pipe α (Fig. 1) or c (Fig. 2) initiated in a known manner under pressure. Due to the peculiar and new guidance of the gas flow, the carbon is deposited evenly distributed throughout the interior of the muffle. The exhaust gases are returned to the furnace of the furnace through the pipe b (Fig. 1) or through the space formed by the pipes c and ä (Fig. 2). According to this method, cementation is achieved that is as uniform as possible both in terms of the surface distribution and the depth of the carbonized layer, namely because the cementation gas remains in the muffle for a relatively long time, but also because the countercurrent cools the Gas is avoided.

Claims (1)

Patent-Anspruch:Patent claim: Zementationsofen, dadurch gekennzeichnet, daß in dem rückwärtigen Teil der Muffel zwei Rohrenden angeordnet sind, von denen das eine als Einleitungs- und das andere als Ableitungsrohr des Zementationsgases dient, wodurch ein nach der Eintrittsstelle rückflutender Gasstrom entsteht. Cementation furnace, characterized in that in the rear part of the Muffle two pipe ends are arranged, one of which as an introduction and the other serves as a discharge pipe for the cementation gas, creating a gas flow that flows back after the entry point. Hierzu 1 Blatt Zeichnungen.1 sheet of drawings.
DENDAT288162D Active DE288162C (en)

Publications (1)

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DE288162C true DE288162C (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU680032B2 (en) * 1993-10-15 1997-07-17 Ici Americas Inc. Polyester films containing precipitated silica particles and calcined china clay
US5721023A (en) * 1993-12-17 1998-02-24 E. I. Du Pont De Nemours And Company Polyethylene terephthalate articles having desirable adhesion and non-blocking characteristics, and a preparative process therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU680032B2 (en) * 1993-10-15 1997-07-17 Ici Americas Inc. Polyester films containing precipitated silica particles and calcined china clay
US5721023A (en) * 1993-12-17 1998-02-24 E. I. Du Pont De Nemours And Company Polyethylene terephthalate articles having desirable adhesion and non-blocking characteristics, and a preparative process therefor

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