High temperature mechanical properties of a multilayer Y-TZP processed by superplastic flow
- Univ. de Sevilla (Spain). Dept. de Fisica Materia Condensada
In a previous paper the authors have described a novel technique to join fine grained ceramics, which takes advantage of the grain boundary sliding as the microscopic mechanism of the superplasticity and of the fact that the creep resistance increases with the grain size. Superplasticity is grain-size dependent, {dot {epsilon}} {approx} (1/d{sup p}), with p between 1 and 3 depending on the rate controlling process. The authors have used these two concepts as a new technique to join layers of 3% mol Y-TZP with four different grain sizes, in order to have the same thermal expansion coefficient avoiding deformation of cavities and microcracks in the interface and so to obtain a functional gradient material (FGM) with anisotropic high temperature mechanical properties.
- OSTI ID:
- 642134
- Journal Information:
- Scripta Materialia, Vol. 39, Issue 1; Other Information: PBD: 5 Jun 1998
- Country of Publication:
- United States
- Language:
- English
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