Thermal Shock Test Ceramics

Practical experience has shown that thermal shock tests do not lead to generally useful test data.

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. An example is a boiling water ice water test or a 300f to ice water test. 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. Thin circular disks are heated up to 1750 k with a tungsten halogen lamp yielding heating rates up to 1200 k s.

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. The transition between temperature extremes occurs very rapidly greater than 15 c per minute. Thermal shock testing exposes products to alternating low and high temperatures to accelerate failures caused by temperature cycles or thermal shocks during normal use.