DE645306C - Process to increase the heat resistance of objects made of iron-aluminum or iron-aluminum-chromium alloys - Google Patents

Process to increase the heat resistance of objects made of iron-aluminum or iron-aluminum-chromium alloys

Info

Publication number
DE645306C
DE645306C DEH145094D DEH0145094D DE645306C DE 645306 C DE645306 C DE 645306C DE H145094 D DEH145094 D DE H145094D DE H0145094 D DEH0145094 D DE H0145094D DE 645306 C DE645306 C DE 645306C
Authority
DE
Germany
Prior art keywords
aluminum
iron
materials
solution
heat resistance
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
DEH145094D
Other languages
German (de)
Inventor
Dr-Ing Werner Hessenbruch
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Heraeus Vacuumschmelze 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 Heraeus Vacuumschmelze AG filed Critical Heraeus Vacuumschmelze AG
Priority to DEH145094D priority Critical patent/DE645306C/en
Application granted granted Critical
Publication of DE645306C publication Critical patent/DE645306C/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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
    • C23C22/62—Treatment of iron or alloys based thereon

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Description

Verfahren zur Erhöhung der Hitzebeständigkeit von Gegenständen aus Eisen-Aluminium-oder Eisen-Aluminium-Chrom-Legierungen Es sind .elektrische Hieizlemente bekanntgeworden, die neben Eisen wechselnde Men-gen an Aluminium, z. B. z bis r z % und gegebenenfalls Chrom in Mengen bis etwa 35 %, enthalten. Diese Legierungen zeichnen sich dadurch aus, daß sie bis zu Temperaturen von etwa 130o° im ganzen sehr hitzebeständig sind. Es ist aber auch bereits hekanatgeworden, daß bei diesen Legierungen gelegentlich eine anormale Erscheinung auftritt, die als Karbunkelbildung bezeichnet wird. Diese Erscheinung besteht darin, daß an einzelnen Stellen, beispielsweise von Heizelementen, schwarze Flecke auftreten, die dann zu Oxydausblühungen und zu einer Zerstörung des Heizelementes an diesen Stellen führen. Auf diese Erscheinung ist beispielsweise in der Zeitschrift Elektrowärme, Januar 1935, einer Arbeit mit dem Titel: Über hochhitzebeständige Chrom-Aluminium-Eisen-Legierungen hingewiesen worden.Method of increasing the heat resistance of objects made of iron-aluminum or iron-aluminum-chromium alloys are known become .Electrical Hieizlemente, the changing in addition to iron quantities of aluminum, for example. B. z up to rz% and optionally chromium in amounts up to about 35%. These alloys are characterized by the fact that they are very heat-resistant up to temperatures of about 130 °. However, it has also become hackneyed that these alloys occasionally show an abnormal phenomenon, which is referred to as carbuncle formation. This phenomenon consists in the fact that black spots appear at individual points, for example on heating elements, which then lead to oxide efflorescence and to destruction of the heating element at these points. This phenomenon was referred to, for example, in the journal Elektrowärme, January 1935, a work with the title: About highly heat-resistant chromium-aluminum-iron alloys.

Erfindungsgemäß wird die Ausbildung dieser Karbunkel und damit eine vorzeitige örtliche Zerstörung der Heizelemente dadurch vermieden, daß man die Werkstoffe vor ihrer Inbetriebnahmne mit einer alkalischen Lösung behandelt. Beispielsweise legt man die fleizel:emnente in eine Sodalösung; in Kalkwasser, in Barytlösungoder Natronlauge. Dabei kann die Dauer des Eintauchers in die alkalischen Lösungen beispielsweise einige Stunden betragen, aber auch bis zu mehreren Tagen ausgedehnt werden.According to the invention, the formation of these carbuncles and thus a premature local destruction of the heating elements avoided by removing the materials treated with an alkaline solution prior to commissioning. For example you put the fleizel: emnente in a soda solution; in lime water, in barite solution or Caustic soda. The duration of immersion in the alkaline solutions can be, for example a few hours, but can also be extended to several days.

Bei der Inbetriebnahmne der in alkalischen Lösungen behändelten Werkstoffe zeigt sich, daß die Neigung zu der geschilderten Karbunkelbildung beseitigt ist.During the commissioning of the materials treated in alkaline solutions it is found that the tendency towards the carbuncle formation described has been eliminated.

Nach dem Herausnehmen der Werkstoffe aus der alkalischen Lösung kann man durch Erhitzen auf mehrere roo° die alkalischen Bestandteile in einem besonderen Arbeitsgang in die behandelten Werkstoffe einbrennen.After removing the materials from the alkaline solution, you can one by heating to several roo ° the alkaline constituents in a special one Burn the process into the treated materials.

Das Einbrennen kann aber auch bei der ersten hetriebsmäßigen Erhitzung des Werkstoffes erfolgen, so daß der hesond@ere Arbeitsgang entfallen kann.The stoving can also take place during the first operational heating of the material, so that the special work step can be omitted.

Wenn man für die Behandlung der Werkstoffe alkalische Flüssigkeiten verwandet, an deren Oberfläche sich :eine Haut der alkalischen Bestandteile bildet, wie beispielsweise bei Kalkwasser, dann empfiehlt es sich, vor dem Herausnehmen der Werkstoffe aus der Lösung diese Haut zu entfernen, damit diese nicht an den Werkstoffen hängenbleibt.If you use alkaline liquids for the treatment of materials related, on the surface of which: a skin of the alkaline components forms, as for example with lime water, then it is advisable to take it out before taking it out of the materials from the solution to remove this skin so that it does not stick to the Materials.

Claims (2)

PATENTANSPRÜCHE: r. Verfahren zur Erhöhung der Hitzebeständigkeit von Gegenständen aus Eisen-Aluminium- oder Eisen-Aluminium-Chrom-Legierungen, dadurch gekennzeichnet, daß die Werkstoffe mit einer alkalischen Lösung, wie Sodalösung,'.Kalkwasser, Barytlösung, Natronlauge, behandelt werden. PATENT CLAIMS: r. Process for increasing heat resistance of objects made of iron-aluminum or iron-aluminum-chromium alloys, thereby marked that the materials with an alkaline solution, such as soda solution, lime water, barite solution, sodium hydroxide solution. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß die Werkstoffe für mehrere Stunden bis zu mehreren Tagen in die alkalische Lösung getaucht werden.-3. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß die Werkstoffe in die alkalische Lösung getaucht und nach dem Herausnehmen auf mehrere i oo° erhitzt werden. q.. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß bei Verwendung solcher alkalischer Lösungen, auf denen sich eine Haut bildet, diese Haut vor dem Herausnehmen der Werkstoffe entfernt wird.2. Procedure according to claim i, characterized in that the materials for several hours be immersed in the alkaline solution for up to several days. -3. Procedure according to Claim i, characterized in that the materials are in the alkaline solution immersed and heated to several i oo ° after removal. q .. procedure according to claim i, characterized in that when using such alkaline Solutions on which a skin forms, this skin before removing the materials Will get removed.
DEH145094D 1935-09-25 1935-09-25 Process to increase the heat resistance of objects made of iron-aluminum or iron-aluminum-chromium alloys Expired DE645306C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH145094D DE645306C (en) 1935-09-25 1935-09-25 Process to increase the heat resistance of objects made of iron-aluminum or iron-aluminum-chromium alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH145094D DE645306C (en) 1935-09-25 1935-09-25 Process to increase the heat resistance of objects made of iron-aluminum or iron-aluminum-chromium alloys

Publications (1)

Publication Number Publication Date
DE645306C true DE645306C (en) 1937-05-25

Family

ID=7179604

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH145094D Expired DE645306C (en) 1935-09-25 1935-09-25 Process to increase the heat resistance of objects made of iron-aluminum or iron-aluminum-chromium alloys

Country Status (1)

Country Link
DE (1) DE645306C (en)

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