DE880448C - Process for covering material parts made of special steel which are to be protected from the effects of the nitriding agent during the nitriding process - Google Patents

Process for covering material parts made of special steel which are to be protected from the effects of the nitriding agent during the nitriding process

Info

Publication number
DE880448C
DE880448C DEB10491D DEB0010491D DE880448C DE 880448 C DE880448 C DE 880448C DE B10491 D DEB10491 D DE B10491D DE B0010491 D DEB0010491 D DE B0010491D DE 880448 C DE880448 C DE 880448C
Authority
DE
Germany
Prior art keywords
nitriding
protected
effects
covering material
parts made
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
DEB10491D
Other languages
German (de)
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.)
Gebrueder Boehler and Co AG
Original Assignee
Gebrueder Boehler and Co AG
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 Gebrueder Boehler and Co AG filed Critical Gebrueder Boehler and Co AG
Priority to DEB10491D priority Critical patent/DE880448C/en
Application granted granted Critical
Publication of DE880448C publication Critical patent/DE880448C/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
    • C23C8/04—Treatment of selected surface areas, e.g. using masks

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)

Description

Verfahren zum Abdecken von Werkstoffteilen aus Sonderstahl, die beim Nitriervorgang vor der Einwirkung des Nitriermittels geschützt werden sollen Es ist häufig notwendig, Sonderstähle, die nicht oder nur schwierig zu nitrieren sind, zu versticken. Dieser Fall tritt ein, wenn z. B. an hitzebeständigen Stählen die sonst schlechten Laufeigenschaften verbessert werden sollen. Das Nitrieren solcher Stähle gelingt, wenn man in bekannter Weise unter Zusatz von flüchtigen oder zersetzlichen Halogenverbindungen dem Nitriervorgang unterwirft. Durch die Halogenverbindungen wird die Stahloberfläche so verändert, daB eine Stickstoffaufnahme stattfindet, wobei die gleichen Härtetiefen erzielt werden können, wie sie sonst an den Nitrierstäblen erhalten «-erden. Oftmals ist es für den Gang der Fertigung oder für die Verwendung von nitrierten Teilen notwendig, bestimmte Stellen des Werkstückes vom Nitriervorgang auszuschalten, die Stickstoffaufnahme also an diesen Teilen zu unterbinden.Method for covering material parts made of special steel that are used in The nitriding process should be protected from the effects of the nitrating agent it is often necessary to use special steels that cannot be nitrided or are difficult to nitrate, to embroider. This case occurs when z. B. on heat-resistant steels otherwise poor running properties should be improved. Nitriding such Steels succeed if you use them in a known manner with the addition of volatile or decomposable Subjecting halogen compounds to the nitration process. Through the halogen compounds if the steel surface is changed in such a way that nitrogen is absorbed, whereby the same hardness depths can be achieved as they are otherwise on the nitriding rods receive «- earth. Often times it is for the manufacturing process or for use of nitrided parts necessary, certain parts of the workpiece from the nitriding process off, i.e. to prevent nitrogen uptake on these parts.

Bei den bisher üblichen Arbeitsweisen wurde dies durch einen metallischen Überzug erreicht. Die nicht zu nitrierenden Stellen wurden verzinnt oder vernickelt und blieben dadurch vor der Einwirkung des Stickstoffes geschützt.In the previous working methods, this was replaced by a metallic Plating achieved. The areas not to be nitrided were tinned or nickel-plated and thus remained protected from the action of nitrogen.

Die Erfindung bezieht sich nun auf ein Verfahren zum Abdecken von Teilen an Werkstücken aus schwer nitrierbaren Sonderstählen, das darin besteht, daß die Wirkung der Halogenverbindung aufgehoben wird. Dies wird durch einen Überzug aus basischen Stoffen erreicht. Es kann 'hierzu vorteilhaft Wasserglas mit basischen Stoffen gemischt oder auch allein angewendet werden. -Ganz allgemein kann festgestellt werden, daß alle basischen Stoffe, die z. B. das Chlor der Halogenverbindung zu stabilen Chloriden binden -(die Natronlauge des Wasserglases zu Kochsalz), für dieses Verfahren geeignet sind.The invention now relates to a method of covering Parts on workpieces made from special steels that are difficult to nitrate, which consists of that the effect of the halogen compound is canceled. This is done through a coating obtained from basic substances. For this purpose it can be advantageous to use water glass with basic Substances can be mixed or used alone. -Generally can be stated be that all basic substances such. B. the chlorine of the halogen compound bind stable chlorides - (the caustic soda in the water glass to table salt), for this Process are suitable.

Claims (1)

PATENTANSPRUCH: Verfahren zum Abdecken von Teilen an Werkstücken aus schwer nitrierbaren Stählen, die nur unter Zusatz von Halogenverbindungen, wie Chloriden, zum Ammoniak nitrierfähig sind, dadurch gekennzeichnet, daß .die Teil durch Aufbringen einer basischen Substanz wie Wasserglas, allein oder im Gemisch mit anderen basischen Stoffen, von der Nitrierung ausgeschaltet w=erden.PATENT CLAIM: Method for covering parts on workpieces steels that are difficult to nitrate, which can only be produced with the addition of halogen compounds such as chlorides, are nitridable to ammonia, characterized in that .the part by application a basic substance such as water glass, alone or in a mixture with other basic substances Substances that are switched off by nitration are grounded.
DEB10491D 1943-07-13 1943-07-13 Process for covering material parts made of special steel which are to be protected from the effects of the nitriding agent during the nitriding process Expired DE880448C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB10491D DE880448C (en) 1943-07-13 1943-07-13 Process for covering material parts made of special steel which are to be protected from the effects of the nitriding agent during the nitriding process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB10491D DE880448C (en) 1943-07-13 1943-07-13 Process for covering material parts made of special steel which are to be protected from the effects of the nitriding agent during the nitriding process

Publications (1)

Publication Number Publication Date
DE880448C true DE880448C (en) 1953-06-22

Family

ID=6956782

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB10491D Expired DE880448C (en) 1943-07-13 1943-07-13 Process for covering material parts made of special steel which are to be protected from the effects of the nitriding agent during the nitriding process

Country Status (1)

Country Link
DE (1) DE880448C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0049373A1 (en) * 1980-09-23 1982-04-14 Schunk & Ebe GmbH Surface hardened sintered iron workpiece and method of manufacturing this workpiece

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0049373A1 (en) * 1980-09-23 1982-04-14 Schunk & Ebe GmbH Surface hardened sintered iron workpiece and method of manufacturing this workpiece

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