Compared with other advanced ceramics, its low thermal expansion coefficient provides good thermal shock resistance. It is extremely hard, surpasses the high temperature capabilities of most metals and also has a superior oxidation resistance. As a consequence, silicon nitride can withstand the toughest conditions in the most demanding high temperature, high-load applications.
Even NASA scientists recognized its unique properties when silicon nitride bearings were used in the main engines of the Space Shuttle. It was identified as one of the few monolithic ceramic materials capable of surviving the severe thermal shock and thermal gradients generated in hydrogen / oxygen rocket engines and proved completely reliable throughout the entire Space Shuttle program.