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Pyroceramics
The term is generally used in a generic sense to refer to porcelain tableware that has an extremely low thermal expansion. While "Corning ware", for example, is a trade secret of Corning Glass Works, it is well known that oven-to-table ware is produced by controlling the firing curve to achieve the development of the beta spodumene phase in the porcelain microstructure (involving soaking, controlled cooling and a final annealing period to relieve internal stresses). 'Pyrex' ware is a low expansion high silica borosilicate glass. The bodies are, of course, based on spodumene. During production Corning used large quantities of it, the material was mined by Tanco in Manitoba, Canada.
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| Materials |
Spodumene
Spodumene is a lithium sourcing feldspar, an alternative to lithium carbonate to supply Li2O to ceramic glazes. Contains up to about 8% Li2O. |
| Glossary |
Co-efficient of Thermal Expansion
The co-efficient of thermal expansion of ceramic bodies and glazes determines how well they fit each other and their ability to survive sudden heating and cooling without cracking. |
| Typecodes |
Low Expansion Material
Materials used to make bodies requiring low expansion (e.g. flameware, refractories). The individual particles of these materials have low expansion. Some of theme even expand at certain temperature ranges. |
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