Recrystallisation temperature of tungsten as a function of the heating ramp

The recrystallisation temperature of tungsten filaments as a function of the heating ramp is investigated. The study is performed on a series of lamps with non-recrystallised filaments. The recrystallisation temperature is determined via two different analysing methods: (1) Micro-structure by analys...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:International journal of refractory metals & hard materials 2006-01, Vol.24 (4), p.321-324
Hauptverfasser: Denissen, C.J.M., Liebe, J., van Rijswick, M.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The recrystallisation temperature of tungsten filaments as a function of the heating ramp is investigated. The study is performed on a series of lamps with non-recrystallised filaments. The recrystallisation temperature is determined via two different analysing methods: (1) Micro-structure by analysing the cross sections of the filament. (2) Change in the resistance of the filament measured at room temperature (non-destructive). These analyses are performed as a function of the annealing temperature and as function of various ramps. The results for the recrystallisation temperature of the two methods are compared. The recrystallisation process of tungsten is described with a thermal activation process. We have found a relatively high activation energy of 800–1000 kJ/mole. The activation energy of the recrystallisation process of tungsten is discussed further.
ISSN:0263-4368
2213-3917
DOI:10.1016/j.ijrmhm.2005.10.012