Metals and Ceramics Division - Oak Ridge National Laboratory
Metals and Ceramics Division - Oak Ridge National Laboratory
Metals and Ceramics Division - Oak Ridge National Laboratory
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Flexural Strength (MPa)<br />
800<br />
700<br />
600<br />
500<br />
400<br />
300<br />
200<br />
100<br />
SN147-31E LM FF<br />
SN147-31E TM FF<br />
SN147-31E LM SF<br />
SN147-31E TM SF<br />
0<br />
0 200 400 600 800 1000 1200<br />
Temperature (°C)<br />
Figure 5. Flexure strength of Ceradyne SN147-31E longitudinally <strong>and</strong> transversely machined as<br />
a function of test temperature in air. FF denotes 30 MPa/s <strong>and</strong> SF denotes 0.003 MPa/s stressing<br />
rate.<br />
Failure Strength (MPa)<br />
10 3<br />
10 2<br />
Dynamic Fatigue of SN147-31E Silicon Nitride<br />
Transversedly Machined<br />
Uncensored Flexure Strength<br />
N ~ 338<br />
31E-TM-20°C<br />
31E-TM-850°C<br />
0.001 0.01 0.1 1 10 100<br />
Stressing Rate (MPa/s)<br />
N ~ 39<br />
Figure 6. Failure strength versus stressing rate curve of SN147-31E longitudinally machined <strong>and</strong><br />
tested at 20° <strong>and</strong> 850C in air.
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