Title of article
Slow crack growth behavior in Si3N4 sintered with Yb2Si2O7 tie-line composition additives
Author/Authors
Choi، نويسنده , , Heon-Jin and Kim، نويسنده , , Hyeong-Jong and Lee، نويسنده , , June-Gunn and Kim، نويسنده , , Young-Wook، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2001
Pages
5
From page
471
To page
475
Abstract
Slow crack growth behavior of two gas pressure sintered Si3N4 ceramics with different additives; a Yb2Si2O7 composition and an Al2O3–Y2O3 composition, was investigated by constant stress-rate (“dynamic fatigue”) testing at 1400°C. The slow crack growth parameter, n, was 14.7 and 6.3 for Si3N4 with Yb2Si2O7 and Al2O3–Y2O3 compositions, respectively. Superior crack growth resistance of Si3N4 with Yb2Si2O7 composition was due to its higher refractoriness of intergranular glassy films, compared to Si3N4 with Al2O3–Y2O3 composition.
Keywords
Thermal Properties , Engine components , Grain boundaries , Si3N4 , Sintering additives
Journal title
Journal of the European Ceramic Society
Serial Year
2001
Journal title
Journal of the European Ceramic Society
Record number
1404995
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