Ivor and Olive Lewis on fri 9 feb 07
Dear Ron,=20
You say and ask bodies - it is well documented in the white ware industry literature - =
how would you explain moisture expansion in such bodies?>>.
I wouldn't.
But consider that (Cardew) Kaolinite looses Hydroxyl radicles starting =
between 450-550 deg C changing to metakaolin, vitrification commences at =
800 deg C (Hamer) and above 1000 deg C metakolin decomposes to give =
Mullite and free Silica (Hamer).
That seems to cover Whitewares.
So, my question remains. What do you mean by "Hydration". Is it a =
chemical reaction, and if it is, what are the reactants and the =
products, or is it a physical association ?=20
Best regards,
Ivor
| |
|
