Reactive sintering of porous tungsten: A cost effective sustainable technique for the manufacturing of high current density cathodes to be used in flashlamps
Tungsten ( T m = 3410 ± 20 °C) is traditionally sintered at temperatures in excess of 2000 °C under hydrogen atmosphere using high temperature furnaces. The process is extremely expensive and it is difficult to gain a control over the microstructure. One of the important applications of this metal m...
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Veröffentlicht in: | Journal of materials processing technology 2005-12, Vol.170 (1), p.471-476 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Tungsten (
T
m
=
3410
±
20
°C) is traditionally sintered at temperatures in excess of 2000
°C under hydrogen atmosphere using high temperature furnaces. The process is extremely expensive and it is difficult to gain a control over the microstructure. One of the important applications of this metal makes use of its porous form as a high current density cathode employed in flashlamps (high power laser lamps). For an improved performance and longer lifetime, a controlled porosity is essential. This study briefly highlights the advantages of an alternative sintering technique based on the concept of reactive sintering previously introduced. This novel process makes use of a small amount of Al addition. Consequently, the sintering temperature is reduced considerably (
T
s
≤
1200
°C) and a more homogeneous porous tungsten is obtained irrespective of the compaction method employed. |
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ISSN: | 0924-0136 |
DOI: | 10.1016/j.jmatprotec.2005.05.037 |