Avoiding thermal shock
Heating or cooling too quickly can crack the product. The design of each kiln zone controls how fast the temperature changes.
Industries
Ceramics
Precise temperature control in every zone of the process, for materials that don’t forgive a bad thermal profile.
Our approach
When thermal precision is the product
In ceramics, poor temperature control doesn’t just cut yield: it can crack, warp or ruin the piece. Heating and cooling have to be gradual enough to avoid thermal shock, and even enough that the whole batch fires alike. This is an industry where the thermal design of the equipment matters as much as its mechanical strength.
The thermal process
One kiln, several temperatures
A rotary kiln does not run at a single temperature: it is divided into zones, each designed for a different thermal job.
Drying
Removal of residual moisture before intense heating begins.
Preheating
A gradual temperature rise to avoid thermal shock in the piece or the product.
Calcination
~900 – 1600 °C
The hottest zone, where the material undergoes its thermal transformation. The exact range depends on the product: from ~900-1000°C for common clay up to 1250-1300°C for refractories, stoneware or porcelain, and as high as 1600°C for some special refractories.
Cooling
A controlled temperature drop to avoid thermal stresses before discharge.
Reference ranges for the industry; the actual design is matched to each product and process.
Industry challenges
What processing ceramics demands
Temperature uniformity
If the product does not heat evenly, some areas overfire while others fall short of the required point. The drum’s internal geometry and its rotation are what deliver that evenness.
Internal refractory linings
At ceramic calcination temperatures the machine itself needs an internal refractory lining that withstands the heat without degrading.
Process atmosphere
Some ceramic products need the firing atmosphere controlled (oxidising, reducing) as well as the temperature.
Technologies applied
Equipment we use in ceramics
Have a ceramic process that needs precise thermal control?
Tell us the product and the temperature range you need, and we’ll propose the right design.