Tacho - 2-3-2004 at 06:35
I use dentist´s casting investment to make refractory bits and pieces. You use it as plaster of paris (gypsum), but it resists very high
temperatures. It is called a “phosphate bonded” investment. I PRESUME (as in: I´m not sure) it has retains no water of hydratation after it´s
hard and heated, opposite to plaster of paris or portland cement.
Could anybody confirm this?
I ask because I presume that, holding no water of hydratation, it would be a good insulator for high voltages at high temperatures.
Just to make sure you know what I am talking about, I add some links:
http://r-curtis.umds.ac.uk/bds3a/Investment%20materials%201....
http://www.spofadental.com/ostatni-gb.htm
http://www.servo-dental.de/enpages/labline/guss.html
http://www.rutenium.com.br/inglesteste/pdf/choquetermicoIngl...
axehandle - 4-3-2004 at 06:56
Check out my V2O5 thread in the Reagents section. I've acquired 500g of the stuff (for FREE!) and am going to experiment with it.
Edit: It's called "GC Fujivest Super" and is made in Belgium.
[Edited on 2004-3-4 by axehandle]
Resistance to SO2 / SO3
axehandle - 4-3-2004 at 08:56
I wonder if the phosphate bonded cement is resistant to SO2 and SO3. If it were, I could embed the heating wire on the <b>inside</b> wall
of the catalyst tube, and then cover it with a thin layer of the cement.
Anyone who knows?