Joining of Y-TZP parts
- Universidad de Sevilla-CSIC (Spain)
Based on the grain boundary sliding (GBS) mechanism, the authors used the structural superplasticity of a 3 mol% Y{sub 2}O{sub 3}-tetragonal ZrO{sub 2} polycrystals (Y-TZP) as a new technique to join two pieces of this material. The fully dense 3 mol% Y-TZP material was obtained from 3Y-TZP powders (Tosoh Co. Japan) which were cold pressed, sintered at 1,430 C for 2 hours and then isostatic hot pressed at 1,400 C for 2 hours. The average grain size of the starting (as-HIPed) material was 0.3 {micro}m. This material was annealed at 1,600 C, for different amounts of time in order to get grain sizes of 0.5, 0.8 and 1.6 {micro}m. From these four type of materials, samples of dimensions 5x3x3 mm were cut and polished using diamond paste of decreasing sizes down to 1 {micro}m. Compression tests at constant cross head speed were carried out in air, and at temperatures between 1,350 and 1,450 C. Microstructural observations and macroscopic parameters as K{sub c} and H{sub v} in Y-TZP show clearly that grain boundary sliding can be used to perform the joining of ceramics through a very small deformation at lower temperatures and for shorter period of time than for direct diffusional bonding.
- OSTI ID:
- 103596
- Journal Information:
- Scripta Metallurgica et Materialia, Vol. 33, Issue 3; Other Information: PBD: 1 Aug 1995
- Country of Publication:
- United States
- Language:
- English
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