Evaluation of quasi-static fracture characteristics considering surface conditions of silicon nitride for a space component

Details Evaluation of quasi-static fracture characteristics considering surface conditions of silicon nitride for a space component Evaluation of quasi-static fracture characteristics considering surface conditions of silicon nitride for a space component

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jphcs.240a2034k&link_type=abstract

Journal of Physics: Conference Series, Volume 240, Issue 1, pp. 012034 (2010).

Physics

Scientific paper

ISAS/JAXA is now planning to adopt a thruster made of monolithic silicon nitride (SN282 manufactured by Kyocera Co.) onto a Venus exploration probe, PLANET-C, in replacement of conventional niobium heat-resistant alloy. Silicon nitride is still brittle and requires precise analysis on multiaxial thermal stresses induced during firing, though it has high toughness among other structural ceramics. This study evaluated quasi-static fracture characteristics of SN282 considering the surface conditions through compression-torsion biaxial fracture tests as well as the conventional four-point-bending tests. The samples were applied to the mechanical tests either as-ground or after annealing at 1300°C in air for 1 h, which formed an oxidation layer of more than 250nm on the specimen surface. Symmetry four-point-bending tests showed that annealing improves flexure strength and reduce the difference caused by grinding directions. Biaxial stress fracture tests showed the high compressive stress makes the influence of facial crack insensitive.

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