DE444126C - Process to prevent the migration (diffusion) of carbon into iron and its alloys during the cementation process - Google Patents

Process to prevent the migration (diffusion) of carbon into iron and its alloys during the cementation process

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Publication number
DE444126C
DE444126C DEL65119D DEL0065119D DE444126C DE 444126 C DE444126 C DE 444126C DE L65119 D DEL65119 D DE L65119D DE L0065119 D DEL0065119 D DE L0065119D DE 444126 C DE444126 C DE 444126C
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DE
Germany
Prior art keywords
carbon
iron
diffusion
prevent
migration
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
DEL65119D
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German (de)
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEL65119D priority Critical patent/DE444126C/en
Application granted granted Critical
Publication of DE444126C publication Critical patent/DE444126C/en
Expired legal-status Critical Current

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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
    • C23C8/04—Treatment of selected surface areas, e.g. using masks

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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)

Description

Verfahren zur Verhütung der Einwanderung (Diffusion) von Kohlenstoff in Eisen und dessen Legierungen während des Zementationsvorgangs. Bei der Einsatzhärtung ist vielfach nur eine teilweise Oberflächenhärtung erwünscht. Zu diesem Zwecke werden die weich zu haltenden Stellen mit Schutzmitteln für die Dauer des Zementationsvorgangs umkleidet. Die bisher bekannten Verhütungsmittel bieten jedoch keine Gewähr, während der Zementation das Eindringen von Kohlenstoff in den zu härtenden Werkstoff vollkommen zu unterbinden.Process for preventing the migration (diffusion) of carbon in iron and its alloys during the cementation process. In case hardening In many cases, only partial surface hardening is desired. Be for this purpose the areas to be kept soft with protective agents for the duration of the cementation process changed clothes. However, the previously known contraceptives offer no guarantee while cementation completely prevents the penetration of carbon into the material to be hardened to prevent.

Erfindungsgemäß wird diesem Übelstand dadurch abgeholfen, daß den an sich bekannten Abdeckmitteln, wie z. B. Kaolin, Lehm usw., eine Schwefelverbindung zugesetzt wird. Diese Schwefelverbindung muß die Eigenschaft besitzen, erst oberhalb der durchschnittlichen Zementationstemperatur (etwa 850'C) in den flüssigen Zustand überzugehen. Eine derartige Schwefelverbindung ist z. B. Schwefeleisen; sie verhindert als Zusatz zu den bekannten Abdeckmitteln mit Sicherheit das Eindringen von Kohlenstoff in die Teile der zu behandelnden Konstruktionsteile, die weich bleiben sollen.According to the invention this drawback is remedied in that the known covering means, such. B. kaolin, clay, etc., a sulfur compound is added. This sulfur compound must have the property of changing into the liquid state only above the average cementation temperature (about 850 ° C.). Such a sulfur compound is e.g. B. sulfur iron; as an addition to the known covering means, it reliably prevents the penetration of carbon into the parts of the structural parts to be treated which are supposed to remain soft.

Claims (1)

PATJ3NTANSI'ILUC:II: Verfahren zur Verhütung der Einwanderung (Diffusion) von Kohlenstoff in Eisen und dessen Legierungen während des Zementationsvorgangs, dadurch gekennzeichnet, daß der zur Verwendung kommenden, an sich bekannten Schutzmasse (wie z. B. Kaolin, Lehm usw.) eine Schwefelverbindung zugesetzt wird.PATJ3NTANSI'ILUC: II: Procedure to prevent immigration (diffusion) of carbon in iron and its alloys during the cementation process, characterized in that the protective mass used per se is known (such as kaolin, clay, etc.) a sulfur compound is added.
DEL65119D 1926-02-16 1926-02-16 Process to prevent the migration (diffusion) of carbon into iron and its alloys during the cementation process Expired DE444126C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL65119D DE444126C (en) 1926-02-16 1926-02-16 Process to prevent the migration (diffusion) of carbon into iron and its alloys during the cementation process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL65119D DE444126C (en) 1926-02-16 1926-02-16 Process to prevent the migration (diffusion) of carbon into iron and its alloys during the cementation process

Publications (1)

Publication Number Publication Date
DE444126C true DE444126C (en) 1927-05-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DEL65119D Expired DE444126C (en) 1926-02-16 1926-02-16 Process to prevent the migration (diffusion) of carbon into iron and its alloys during the cementation process

Country Status (1)

Country Link
DE (1) DE444126C (en)

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