New material for flashlamp cathodes

It has recently been shown that porous tungsten can be sintered at much lower temperatures (T2000°C). This was achieved by the addition of a small amount of aluminium to tungsten at the powder preparation stage. As a result, homogeneous microstructures with uniform porosity distributions were obtain...

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Veröffentlicht in:Powder metallurgy 2005-09, Vol.48 (3), p.241-244
Hauptverfasser: Selcuk, C., Wood, J. V.
Format: Artikel
Sprache:eng
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Zusammenfassung:It has recently been shown that porous tungsten can be sintered at much lower temperatures (T2000°C). This was achieved by the addition of a small amount of aluminium to tungsten at the powder preparation stage. As a result, homogeneous microstructures with uniform porosity distributions were obtained. This short article presents some of the results from the tests conducted, using the reactive sintered compacts as cathodes in flashlamps. The results were found to be encouraging. However, the blackening of the quartz lamp was observed after a certain amount of time (3-20 h) suggesting sputtering, with some grey deposits accumulating on the surface of the cathode. Further improvements are anticipated by focusing on the optimisation of the structure/performance relationship.
ISSN:0032-5899
1743-2901
DOI:10.1179/174329005X64180