Structure Dependent Creep and Crack Propagation in Silicon Nitrides

Gehrke, E.; Riedel, Hermann; Schubert, Heinrich; Schneider, Gerhard

doi:10.4028/www.scientific.net/kem.89-91.599

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“…It is a nearly universal phenomenon that annealing silicon nitride in air improves its creep resistance. [31][32][33][34][35][36][37][38][39][40] Only rarely does it degrade creep resistance. 38,41 The surface oxide layer that forms during oxidation is only one of the many responses of the material.…”

Section: (2) Specimen Size Effectsmentioning

confidence: 99%

Results of an International Round‐Robin for Tensile Creep Rupture of Silicon Nitride

Luecke

2002

Journal of the American Ceramic Society

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Fourteen laboratories participated in an interlaboratory study to establish the within-and between-laboratory repeatability of tensile creep rupture of silicon nitride. In air at 1375°C at 200 MPa, the times to failure ranged over a factor of 50, and the minimum creep rates ranged over a factor of 20. Despite these large ranges, taken individually, no one laboratory stands out from any other; all produced equally acceptable data. Consumers of silicon nitride tensile creep data must accept this magnitude of variability in reported creep data. The wide variety of specimen shapes and sizes, gripping systems, extensometry techniques, and temperature measurement strategies makes it impossible to assign definitively the root cause of the variability. However, there was a significant specimen size effect. As a group, the smalldiameter specimens lasted roughly five times longer and crept three times more slowly than the large-diameter buttonhead specimens. A possible interpretation of the origin of this difference is that the oxidizing conditions affected more of the volume of the small specimens during the test.

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Section: (2) Specimen Size Effectsmentioning

confidence: 99%

Results of an International Round‐Robin for Tensile Creep Rupture of Silicon Nitride

Luecke

2002

Journal of the American Ceramic Society

View full text Add to dashboard Cite

show abstract

Structure Dependent Creep and Crack Propagation in Silicon Nitrides

Cited by 1 publication

References 0 publications

Results of an International Round‐Robin for Tensile Creep Rupture of Silicon Nitride

Results of an International Round‐Robin for Tensile Creep Rupture of Silicon Nitride

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