AT162896B - Process for sintering iron and steel blanks - Google Patents
Process for sintering iron and steel blanksInfo
- Publication number
- AT162896B AT162896B AT162896DA AT162896B AT 162896 B AT162896 B AT 162896B AT 162896D A AT162896D A AT 162896DA AT 162896 B AT162896 B AT 162896B
- Authority
- AT
- Austria
- Prior art keywords
- iron
- steel blanks
- sintering iron
- soot
- steel
- Prior art date
Links
Landscapes
- Powder Metallurgy (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zum Sintern von Eisen-und Stahlformlingen Sintereisen-und Sinterstahlkörper werden in steigendem Masse angewendet. Bei ihrer Herstellung erfolgt das Sintern unter Wasserstoff oder unter Schutzgas, das häufig so eingestellt wird, um auch ohne Einbettung der Formlinge weder oxydierend noch aufkohlend zu wirken.
Insbesondere bei der Herstellung von Sinterstahlteilen werden Temperaturen von 1200 bis 1350 C benötigt, so dass hiefür nur Öfen mit Heizkörpern aus Molybdän oder dessen Legierungen verwendet werden können.
Es wurden daher ausgedehnte Versuchsreihen durchgeführt mit dem Ziele, die Verwendung der üblichen silitstabgeheizten oder gasgefeuerten Öfen bei der Ausführung des Sinterns von Eisenund Stahlformlingen zu ermöglichen.
Auf Grund der dabei gewonnenen Erkenntnisse wurde überraschenderweise gefunden, dass man Eisen-oder Stahlformlinge in Graphittiegeln unter einer Schichte von Russ einwandfrei sintern kann. Der Russ schützt vor Oxydation und führt auch bei mehrstündigem Erhitzen auf 1300 C merkwürdigerweise nicht zur Bildung von Guss- eisen. An Stelle von Russ oder einem Gemisch mit demselben können auch andere inaktive Kohlenstoffträger, wie z. B. graphithaltige Tonmassen, verwendet werden. Ihre Eignung ist durch Vorversuche leicht zu ermitteln. Keinesfalls dürfen aber Kohlenstoffträger genommen werden, die sehr aktiv sind, wie z. B. die Massen für das Zementieren ; diese führen zu einer starken Kohlenstoffaufnahme und damit zur Bildung von Gusseisen.
Da der Russ selbst bei höherer Temperatur recht langsam verbrennt, aber sehr beweglich ist, kann man die damit bedeckten Formlinge wie unter einer Flüssigkeit bewegen und z. B. direkt aus dem schützenden Russ in Öl härten.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Process for sintering iron and steel moldings Sintered iron and sintered steel bodies are being used to an increasing extent. In their production, sintering takes place under hydrogen or under protective gas, which is often adjusted so that it has neither an oxidizing nor a carburizing effect even without embedding the molded articles.
Temperatures of 1200 to 1350 C are required, particularly in the manufacture of sintered steel parts, so that only furnaces with heating elements made of molybdenum or its alloys can be used for this.
Extensive series of tests have therefore been carried out with the aim of making it possible to use the usual silicon rod-heated or gas-fired furnaces when carrying out the sintering of iron and steel moldings.
On the basis of the knowledge obtained in this way, it was surprisingly found that iron or steel moldings can be perfectly sintered in graphite crucibles under a layer of soot. The soot protects against oxidation and, strangely enough, does not lead to the formation of cast iron even if heated to 1300 C for several hours. Instead of soot or a mixture with the same, other inactive carbon carriers, such as. B. graphite clay masses can be used. Their suitability can easily be determined through preliminary tests. Under no circumstances should carbon carriers be used that are very active, such as B. the masses for cementing; these lead to a high level of carbon absorption and thus to the formation of cast iron.
Since the soot burns very slowly, even at a higher temperature, but is very mobile, the moldings covered with it can be moved like under a liquid and z. B. harden directly from the protective soot in oil.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT162896T | 1946-08-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT162896B true AT162896B (en) | 1949-04-25 |
Family
ID=3651929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT162896D AT162896B (en) | 1946-08-09 | 1946-08-09 | Process for sintering iron and steel blanks |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT162896B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1088522B (en) * | 1952-11-06 | 1960-09-08 | Max Koehler Dr Ing | Process for the production of iron-based sintered bodies with additions of lead and carbon |
-
1946
- 1946-08-09 AT AT162896D patent/AT162896B/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1088522B (en) * | 1952-11-06 | 1960-09-08 | Max Koehler Dr Ing | Process for the production of iron-based sintered bodies with additions of lead and carbon |
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