DE521732C - Covering agent for use and quenching - Google Patents

Covering agent for use and quenching

Info

Publication number
DE521732C
DE521732C DEB134567D DEB0134567D DE521732C DE 521732 C DE521732 C DE 521732C DE B134567 D DEB134567 D DE B134567D DE B0134567 D DEB0134567 D DE B0134567D DE 521732 C DE521732 C DE 521732C
Authority
DE
Germany
Prior art keywords
quenching
hardening
covering agent
covering
temperatures
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
DEB134567D
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.)
Berliner Haertepulver Ges M B
Original Assignee
Berliner Haertepulver Ges M B
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 Berliner Haertepulver Ges M B filed Critical Berliner Haertepulver Ges M B
Priority to DEB134567D priority Critical patent/DE521732C/en
Application granted granted Critical
Publication of DE521732C publication Critical patent/DE521732C/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
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
    • 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)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Anti-Oxidant Or Stabilizer Compositions (AREA)

Description

Abdeckmittel für die Einsatz- und Abschreckhärtung Das Umhüllen von Metallen bei der Einsatz- und Abschreckhärtung ist bekannt. Die zur Zeit üblichen Methoden haben den Nachteil, daß die Isolierschicht bei höheren Temperaturen reißt und an den Metallteilen festbrennt.Covering agents for case hardening and quench hardening The wrapping of Metals in case hardening and quench hardening are known. The usual ones at the moment Methods have the disadvantage that the insulating layer tears at higher temperatures and sticks to the metal parts.

Die üBleichen Härtetemperaturen liegen zwischen 8oo und goo° C. Ein großer Teil aller zu härtenden Gegenstände wird bei diesen Temperaturen gehärtet. In besonderen Fällen wird auch die Abschreckhernperatur auf iz5o° C und darüber gesteigert. Das Abdeckmittel soll nun bei der Einsatz- oder Abschreckhärtung die nicht zu härtenden Stellen dicht umgeben und muß demnach die ärenannten Temperaturen ohne zu reißen aushalten können.The usual hardening temperatures are between 8oo and goo ° C. A A large part of all objects to be hardened are hardened at these temperatures. In special cases the quenching temperature is set at iz5o ° C and above increased. The covering agent should now be used during the case hardening or quench hardening areas not to be hardened tightly and must therefore the specified temperatures can endure without tearing.

Es ist zwar vorgeschlagen worden, als Abdeckmittel ein Wasserglasabdeckmittel mit Zusatz von feuerfesten Erden zu verwenden. Diese Wasserglasabdeckmittel haben indessen u. a. den Nachteil, daß sie sich in Vertiefungen der zu härtenden Gegenstände festsetzen und geradezu einfressen, so d'aß vielfach die abgedeckten Gegenstände, namentlich Gewindestellen usw., Beschädigung erfahren. Demgegenüber kann das neue Abdeckmittel sehr leicht entfernt werden, obwohl es eine hohe Deckkraft und -beständigkeit während der Härtung und Abschreckung besitzt.It has been proposed to use a water glass cover agent as the cover agent to be used with the addition of refractory earth. Have these water glass masking agents however, inter alia the disadvantage that they are in depressions of the objects to be hardened seize and downright eat, so that often the covered objects, namely thread points etc., experienced damage. In contrast, the new Covering agent can be removed very easily, although it has high opacity and resistance possesses during hardening and quenching.

Die Erfindung beseitigt die Mängel .dadurch, daß sie den zum Reißen neigenden feuerfesten Erden, z. B. Lehm, Ton usw., ein Leichtmetallpulver, z. B. Aluminiumpulver (3 bis io °/o), beimischt. Außerdem kann noch das Mineral Bauxit in Pulverform hinzugefügt werden. Im Gegensatz zu anderen Metallen werden die durch die Masse des Abdeckrnittels fein verteilten Leichtmetallpulverzu.sätze bei den Härtetemperaturen, schmelzen. Sie bilden bei dem nachfolgenden Abschrecken ein die Abdeckmasse durchdringendes und zusammenhaltendes Gerippe von feinen Metalläderchen. Diese Metalläderchen durchsetzen schwammartig die ganze Abdeckmasse und verhindern ein Reißen oder Abfallen der Abdeckmasse beim Abschrecken. Die Zumisehung von Bauxit hat hierbei den. Vorteil, daß es bei der Erwärmung im Gegensatz zu den feuerfesten Erden, die sich leicht dehnen, bei höheren Temperaturen bekanntlich etwas schwindet und dadurch einen Ausgleich gegenüber .der Wärmerdeh.nung der anderen Bestandteile schafft. Das fein verteilte Netzwerk verhindert besonders beim Abschrecken in Wasser, Öl usw. das Reißen der Umhüllung.The invention eliminates the shortcomings .d By making them tear inclined refractories, e.g. B. loam, clay, etc., a light metal powder, e.g. B. Aluminum powder (3 to 10 per cent) mixed in. The mineral bauxite can also be used be added in powder form. In contrast to other metals, the the mass of the covering means finely distributed light metal powder additives for the Hardening temperatures, melting. They form a die in the subsequent quenching Covering mass penetrating and cohesive framework of fine metal veins. These little metal veins penetrate the entire covering compound like a sponge and prevent it cracking or falling off of the covering compound during quenching. The addition of bauxite has here the. Advantage that it is heated in contrast to the refractory Soils that stretch slightly, as is well known, shrink somewhat at higher temperatures and thereby a compensation for the thermal expansion of the other components creates. The finely distributed network prevents, especially when quenching in water, Oil etc. tearing of the casing.

Claims (1)

PATENTANSPRUCH: Aus feuerfesten Erden bestehendes Abdeckmittel zum Weichhalten bestimmter Stellen bei der Einsatz- und Abschreckhärtung, gekennzeichnet durch einen Zusatz von Leichtmetallpulver, z. B. Aluminiumpulver.PATENT CLAIM: Covering agent made of refractory earth for Holding certain areas soft during case hardening and quench hardening, marked by adding light metal powder, e.g. B. aluminum powder.
DEB134567D 1927-11-25 1927-11-25 Covering agent for use and quenching Expired DE521732C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB134567D DE521732C (en) 1927-11-25 1927-11-25 Covering agent for use and quenching

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB134567D DE521732C (en) 1927-11-25 1927-11-25 Covering agent for use and quenching

Publications (1)

Publication Number Publication Date
DE521732C true DE521732C (en) 1931-03-26

Family

ID=6998563

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB134567D Expired DE521732C (en) 1927-11-25 1927-11-25 Covering agent for use and quenching

Country Status (1)

Country Link
DE (1) DE521732C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1195783B (en) * 1959-11-05 1965-07-01 Johnson Process for preventing the warping of metal parts, such as molded and stamped parts, during heat treatment
DE3628264A1 (en) * 1986-08-20 1988-02-25 Man Nutzfahrzeuge Gmbh Process for the manufacture of components from steel of high strength with at the same time high toughness, which retain these properties even after hot-forming

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1195783B (en) * 1959-11-05 1965-07-01 Johnson Process for preventing the warping of metal parts, such as molded and stamped parts, during heat treatment
DE3628264A1 (en) * 1986-08-20 1988-02-25 Man Nutzfahrzeuge Gmbh Process for the manufacture of components from steel of high strength with at the same time high toughness, which retain these properties even after hot-forming

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