1050-1200+C (1922-2192F)
Spinel phase meta kaolin converts to mullite
Mullite begins forming at about 1050C, as temperature increases, the characteristic needle-shaped secondary mullite crystals grow within the feldspar glass of porcelains and stonewares.
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| Temperatures | Metakaolin converts to spinel phase (950-1050) |
| Temperatures | Dehydroxylation in kaolin, ball clay (450-650) |
| Minerals |
Mullite
Mullite (3Al₂O₃·2SiO₂) is a naturally occurring aluminum silicate crystalline mineral. It forms in h |
| Materials |
Mullite
A highly refractory low-expansion alumino-silicate crystal formed naturally only rarely but produced industrially and within fired kaolin bodies. |