A refractory material or refractory is a material that is resistant to decomposition by heat, pressure, or chemical attack, and retains strength and form at high temperatures.
Refractories come in all shapes and sizes. They can be pressed or molded for use in floors and walls, produced in interlocking shapes and wedges, or curved to fit the insides of boilers and ladles. Some refractory parts are small and possess a complex and delicate geometry.
So, the material we use in kilns is bricks!
Brickwork in kilns and furnaces are extraordinarily resilient and long lasting, withholding the stresses it undergoes at every firing/cooling cycle. Even when it seems to be almost flaking away, it can still withstand temperatures of 1700C / 3092F. Despite that, there comes a point at which old and damaged refractory bricks degrade to the extent that they do begin to exact a cost on productivity through inefficient heat retention and even damage to the kiln ware from dust or particles falling off the bricks.
Also known as firebricks, chamotte and fire clay, they contain high levels of alumina, as well as silica. More alumina content results in higher density and the greater temperatures that the bricks can withstand. Fired at higher temperatures than standard building bricks, they are also denser and tougher. Firebrick cannot really be effectively repaired, just replaced.
We at Therser can repair and refurbish refractory lining and brickwork in kilns, either just one or two sections or an entire rebuild and upgrade the insulation at the same time by installing a modern alternative that demonstrates greater heat efficiency and therefore lower running costs. Call us today to discuss your repair requirements on +44 (0) 1782 824453 or use our contact form.