Thermal Shock Test Ceramics

It is fairly easy to test ceramic items for their ability to resist the thermal shock to which they are likely to be exposed.

Thermal shock test ceramics. The thermal shock and thermal fatigue behaviour of ceramic materials has been determined with a new type of testing system 3. At present the research of thermal shock resistance on ceramic material is mostly concentrating on the determination of critical temperature differences thermal shock cycles residual strength. The thermal shock of ceramic materials is influenced by many factors such as strength young s modulus fracture toughness thermal conductivity and thermal expansion coefficient. As whisker reinforced silicon nitrides can show an improvement in room temperature strength and fracture toughness one would expect that these cmcs will also possess increased thermal shock resistance.

Thin circular disks are heated up to 1750 k with a tungsten halogen lamp yielding heating rates up to 1200 k s. The transition between temperature extremes occurs very rapidly greater than 15 c per minute. This is probably due to the fact that thermal shock failure is a complicated function of the external thermal shock conditions and of the temperature functions of five different material properties.