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Firebrick are thermally stable for the temperature range they are specified. However , some materials may cause chemical changes in certain types of fire brick and develop lower melting phases. I am thinking of glazes dripping onto brick. The normal Nichrome elements will not do this. Also silicon carbide elements will not deteriorate the brick.


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Your firebricks will already have been fired, I'm not sure anyone makes kilns with green firebricks, they would move around when firing. On the other hand if you have used fire clay , fire cement, or refractory cement to put your kiln together, then you need to ramp temperature slowly , fire clay cures with heat using the appropriate temperature and ramp ...


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