Silicon Nitride — Thermal Expansion

Because of its excellent thermal and mechanical properties, silicon nitride is used more and more for high-tech applications (e.g. valves in automobile engines). Of course, the properties of the final parts are heavily influenced by the production/sintering process. Depicted in this figure is the thermal expansion of a silicon nitride green body. The sintering step starting at 1201°C is due to the influence of the sintering additives. The main shrinkage step occured at 1424°C (extrapolated onset). The effect above 1760°C is most probably due to evaporation of additives. (measurement with DIL 402 C)

DIL 402 C - Vacuum-tight, horizontal pushrod dilatometer

This highly vacuum-tight, horizontal push rod dilatometer with a measuring system made of Invar, a high-resolution inductive displacement transducer and comprehensive thermostatization offers high precision, reproducibility and long-term stability – the best qualifications for demanding use in research and development.