AT135661B - Process for the production of shaped pieces from alloys of precious metals which cannot be processed or are difficult to process in the finished state - Google Patents

Process for the production of shaped pieces from alloys of precious metals which cannot be processed or are difficult to process in the finished state

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Publication number
AT135661B
AT135661B AT135661DA AT135661B AT 135661 B AT135661 B AT 135661B AT 135661D A AT135661D A AT 135661DA AT 135661 B AT135661 B AT 135661B
Authority
AT
Austria
Prior art keywords
alloys
production
difficult
processed
precious metals
Prior art date
Application number
Other languages
German (de)
Original Assignee
Heraeus Gmbh W C
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 Gmbh W C filed Critical Heraeus Gmbh W C
Application granted granted Critical
Publication of AT135661B publication Critical patent/AT135661B/en

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  • Powder Metallurgy (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur   Herstellung   von   Formstücken anus   im fertigen Zustand nicht oder nur schlecht ver- arbeitbaren Legierungen von Edelmetallen. 



   Es ist bereits bekannt, dass zwischen unmittelbar aufeinanderliegenden Metallen bei Erhitzung auf bestimmte Temperaturen Diffusionserscheinungen auftreten, so dass sich an den   Berührungsflächen     oberflächlich   Legierungen bilden. Einem Vorschlag entsprechend soll diese Tatsache dazu verwendet 
 EMI1.1 
 stellen, dass das Formstück aus vielen ganz dünnen, der Reihe nach elektrolytisch aufgetragenen abwechselnden Schichten der die Legierung ergebenden Metalle gebildet und dann erhitzt wird, wobei durch Diffusion die gewünschte Legierung entsteht. 
 EMI1.2 
 

 <Desc/Clms Page number 2> 

 
 EMI2.1 
 Tiefe erreicht hat. 



   Eine andere Ausführungsform des Verfahrens ist in folgendem Beispiel beschrieben :
Ein Gegenstand aus Palladium kann dadurch vergütet werden, dass er analog der Stahleinsatzhärtung in Siliziumpulver eingebettet und dann mehrere Stunden auf   800-1000  C   erhitzt wird. Durch den Einsatzkasten leitet man dabei Wasserstoff, da eine reduzierende Atmosphäre den Diffusionsvorgang günstig beeinflusst. Während des Glühens wandert Silizium in den   Palladiumgegenstand   hinein und bewirkt je nach der Dauer der Wärmebehandlung eine oberflächliche oder durchgehende Härtung desselben. 
 EMI2.2 




   <Desc / Clms Page number 1>
 



  Process for the production of shaped pieces anus in the finished state difficult or impossible to process alloys of precious metals.



   It is already known that diffusion phenomena occur between metals lying directly on top of one another when heated to certain temperatures, so that alloys are formed on the surface of the contact surfaces. According to a proposal, this fact should be used for this purpose
 EMI1.1
 Make sure that the shaped piece is formed from many very thin, successively electrolytically applied alternating layers of the metals resulting in the alloy and then heated, whereby the desired alloy is created by diffusion.
 EMI1.2
 

 <Desc / Clms Page number 2>

 
 EMI2.1
 Has reached depth.



   Another embodiment of the method is described in the following example:
An object made of palladium can be remunerated by embedding it in silicon powder analogous to the case hardening process and then heating it to 800-1000 C for several hours. Hydrogen is passed through the insert box, since a reducing atmosphere has a positive effect on the diffusion process. During the annealing, silicon migrates into the palladium object and, depending on the duration of the heat treatment, causes the same to harden on the surface or through it.
 EMI2.2
AT135661D 1930-09-13 1931-08-26 Process for the production of shaped pieces from alloys of precious metals which cannot be processed or are difficult to process in the finished state AT135661B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE135661X 1930-09-13

Publications (1)

Publication Number Publication Date
AT135661B true AT135661B (en) 1933-11-25

Family

ID=5666041

Family Applications (1)

Application Number Title Priority Date Filing Date
AT135661D AT135661B (en) 1930-09-13 1931-08-26 Process for the production of shaped pieces from alloys of precious metals which cannot be processed or are difficult to process in the finished state

Country Status (1)

Country Link
AT (1) AT135661B (en)

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