Sintering of alumina ceramics
Firing of alumina ceramics proceeds in electrical tunnel furnaces where organic binders are removed from the fired parts and then alumina particles are sintered at temperatures up to 1650 °C to form alumina grains. The sintered ceramic parts are cooled down.
All volatile organic binders are burned out using gas burner not to pollute the environment.
Resintering of alumina ceramics
When the camber of the fired substrates exceeds the specified limits, resintering tunnel furnaces are used to get rid of the camber of the fired ceramics under the influence of pressure and temperatures round 1350 °C.