High temperature resistance excellent insulating mullite kiln
When you decide to design a kiln, one should consider the kiln
shelves an important factor that may influence the shape and size
of the structure. Several factors will have a role in shelf
Mullite Kiln shelf is one of the best kiln shelf in the kiln, its
size will play a major role in the design of the kiln. There are
several standard sizes of square and rectangular shaped shelves.
The potter should choose a shelf size that is readily available.
One should consider the size of ware, especially diameter, that is
made and how the pots will occupy space on a shelf, including the
placement of support posts. Maximum weight one can comfortably lift
may be important when thinking about the type and size of the
After kiln shelf size is factored into the design of the kiln, then
the type of shelf will be the next consideration. Maximum firing
temperature, type of fuel and atmosphere, cost and again, shelf
weight, all must be taken into account with shelf selection.
We must think about the thermal conductivity of the kiln
shelves,This is explained as the coefficient of thermal
conductivity, which is the amount of heat that passes through a
unit cube of material in a given time when the difference in
temperature difference across the cube is one degree. Simply put,
different materials will conduct heat at different rates. The lower
the number designation, the more insulating the material is and
thus, more energy is required to heat the shelf to a given
temperature. It takes considerably more time and energy to heat a
cordierite than a silicon carbide shelf.Once heated, shelves with
lower numbers will have a tendency to hold the heat longer, which
may be an advantage in slowing the cooling of the kiln.
|Volume density (g/cm3)||2.70||2.65|
|Show porosity (%)||14.5||17|
|Breaking strength at RT||13 Mpa||11Mpa|
|AT 1400 ℃||9Mpa||7Mpa|
Mullite kiln shelves can work at 1400℃,but commonly we do not make
pure mullite, we often add some cordierite into mullite, then it is
Cordierite-Mullite material, it has features of mullite and
cordierite. Of course, we have our own formula, and we can
recommend suitable for customer.
Sometimes we do not only consider using temperature,we also need to
pay attention to load and using condition. If your temp-up and
temp-down is very quick, then Cordierite is better.
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