Die Viskosität Metallischer Schmelzen
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Imported Edition - Ships in 18-21 Days
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Die Viskositat, die auch als Zahigkeit oder innere Reibung bezeichnet wird, wird definiert durch die Tangentialkraft K, die zwei Flussigkeitsschichten von der Flache Fund einen Abstand Z aufeinander ausuben, wenn zwischen ihnen eine relative Geschwindigkeit V herrscht: K = n F dV I dZ -1 ( Die Einheit fur den Viskositatkoeffizienten ist 1 Poise = 1 g - cm -1) () - sec. oder 1 Zentipoise = 0,01 Poise - Das sehr oft auftretende V- hal tnis r = von absoluter oder dynamischer Viskosi tat 7J zur Dichte S 2 1 heiBt kinematische Viskositat und wird in der Einheit Stokes (cm - sec.- ) gemessen. Die Untersuchung der Viskositat flussiger Metalle hat sowohl theoretische als auch praktische Bedeutung. Die praktische Bedeutung geht daraus hervor, daB die Viskositat eng mit dem FlieBv rmogen verbunden ist. Eine umfassende Kenntnis dieser Eigenschaft gibt ein Kriterium fur die Auswahl der Legie- rungen und die Kontrolle der GieBbedingungen. Seit einigen Jahren kommt der Anwendung flussiger Metalle in der Warmetechnik als Warmeaustauschmit- tel Bedeutung zu, so z.B. in Atomreaktoren. Diese Gesichtspunkte zeigen die wachsende praktische Bedeutung der Viskositatsuntersuchungen fltis- ger Metalle. Auf der theoretischen Seite gibt die Untersuchung der Viskositat einige nutzliche Hinweise auf Struktur und Eigenschaften von Schmelzen. Hieruber ist bis heute verhaltnismaBig wenig bekannt. 1m Laufe der letzten zwei Jahrzehnte sind zahlreiche Viskositatsuntersu- chungen durchgeftihrt worden. Da es aber keine einheitliche MeBmethode gibt und die Schwierigkeiten der Versuchsdurchftihrung groB sind, stimmen die Ergebnisse 'oft nicht miteinander tiberein.
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