kevin_hulmes@uk.ibm.com on wed 30 oct 96
On Monday 28 October, Trevor Herceg (Wolverhampton, England) wrote ....
>I came across some information about Tungsten Oxide for use in glazes.
>The paper didn't give us any idea about use or colours or temperatures.
Hi neighbour .....
I haven't used Tungsten Oxide, but Dora Billington (in The Technique of
Pottery, Batsford 1962) said that Tungsten and Molybdenum produce
high-temperature yellows. This is consistent with their position in a
group of transition elements which also includes Uranium and Chromium.
The most stable oxide of tungsten (latin: Wolfram) is WO3, and is
yellow. The chloride and a lower oxide (W2O5) are blue, so it might be
possible to achieve blue in a glaze? The sulphide (sulfide) is brown.
I imagine that it's pretty expensive stuff.
Tungsten has the highest melting point of any known metal (3,380
degrees C), but sadly, it oxidises readily at high temperatures, so you
can't use it in the kiln! The filament of an electric light bulb is made
of Tungsten metal... but you probably knew that already ... and the bulb
is there to keep the oxygen out.
Kevin ...... in Leamington Spa, England ..... hoping that he'll soon
find a use for the other side of his brain.
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