On the Effect of Local Grain-Boundary Chemistry on the Macroscopic Mechanical Properties of a High Purity Y2O3-Al2O3-Containing Silicon Nitride Ceramic: Role of Oxygen

Ziegler, A; McNaney, J M; Hoffman, M J; Ritchie, R O

doi:10.1557/PROC-839-P3.14

On the Effect of Local Grain-Boundary Chemistry on the Macroscopic Mechanical Properties of a High Purity Y2O3-Al2O3-Containing Silicon Nitride Ceramic: Role of Oxygen

Conference · Tue Nov 23 04:00:00 EST 2004

DOI:https://doi.org/10.1557/PROC-839-P3.14· OSTI ID:15014652

Ziegler, A; McNaney, J M; Hoffman, M J; Ritchie, R O

The effects of grain-boundary chemistry on the mechanical properties were investigated on high-purity silicon nitride ceramics, specifically involving the role of oxygen. Varying the grain-boundary oxygen content, by control of oxidizing heat treatments and sintering additives, was found to result in a transition in fracture mechanism from transgranular to intergranular fracture, with an associated increase in fracture toughness. This phenomenon is correlated to an oxygen-induced change in grain-boundary chemistry that appears to affect fracture by ''weakening'' the interface, facilitating debonding and crack advance along the boundaries, and consequently toughening by grain bridging. It is concluded that if the oxygen content in the thin grain-boundary films exceeds a lower limit, which is {approx}0.87 equiv% oxygen content, then the interfacial structure and bonding characteristics favor intergranular debonding during crack propagation; otherwise, transgranular fracture ensues.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 15014652

Report Number(s):: UCRL-CONF-208303

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
ADDITIVES
BONDING
CERAMICS
CHEMISTRY
CRACK PROPAGATION
FRACTURE PROPERTIES
FRACTURES
HEAT TREATMENTS
MECHANICAL PROPERTIES
OXYGEN
SILICON NITRIDES
SINTERING

On the Effect of Local Grain-Boundary Chemistry on the Macroscopic Mechanical Properties of a High Purity Y2O3-Al2O3-Containing Silicon Nitride Ceramic: Role of Oxygen

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