Development of Failure Tolerant Multi-Layer Silicon Nitride Ceramics: Review from Macro to Micro Layered Structures |
| Journal |
Key Engineering Materials (Volume 333) |
| Volume |
Functional Gradient Ceramics, and Thermal Barriers |
| Edited by |
Marc Anglada et al. |
| Pages |
117-126 |
| DOI |
10.4028/www.scientific.net/KEM.333.117 |
| Online since |
March, 2007 |
| Authors |
Jakob Kübler,
Gurdial Blugan,
M. Lugovy,
V. Slyunyayev,
N. Orlovskaya,
Richard Dobedoe
|
| Keywords |
Composite, Fracture Toughness, Laminates, Residual Stress |
| Abstract |
Recent developments have shown that producing multi-layer ceramic laminates with
alternative layers under compressive and tensile stress can lead to significant improvements in
toughness at a low cost. However, in many cases the improvements in fracture toughness is
associated with the presence of surface “edge cracks” in the compressive layers or the use of porous
interfaces between the layers. At the same time such effects can limit the performance of ceramics
when used in harsh environments. This review covers the development of silicon nitride based
laminate structures and characterisation of these multi-layer structures. The work presents the
results of macro-layered laminates with layers greater than 150 μm thickness. The apparent fracture
toughness of different designs is measured and the conditions for failure tolerant effects, including
crack deflection, bifurcation and edge cracking, are shown and discussed. The structural and
processing limitations of the macro-layered laminates are also presented. The development of a
weight function analysis as an effective design tool for developing micro-layered laminates with
layers of approximately 50 μm thickness is discussed along with the apparent fracture toughness
results from these micro-laminates. The failure tolerant behaviour as well as the ease of producing
micro-layered laminates with a toughness of 2-3 times higher than that of silicon nitride is shown. |
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