Joining of yttria-tetragonal stabilized zirconia polycrystals using nanocrystals
- Univ. de Sevilla (Spain). Dept. de Fisica Materia Condensada
- Technion-Israel Inst. of Tech., Haifa (Israel). Dept. of Materials Engineering
- Univ. de Extremadura, Badajoz (Spain). Dept. de Fisica
Superplastic flow has been successfully used to join fully dense 3 mol% Y{sub 2}O{sub 3}-tetragonal ZrO{sub 2} polycrystals (Y-TZP) at temperatures as low as 1,350 C, a temperature at which direct diffusional bonding would be unlikely to produce a strong, pore-free joint. The objective of the present work was to determine whether bonding temperatures could be further reduced. To achieve lower bonding temperatures, the authors have investigated the bonding of conventional Y-TZP in which a nanocrystalline Y-TZP with a 20-nm grain size is used as the interlayer between two pieces of 0.3 {micro}m grain sizes Y-TZP. Little is known about the deformation of fully dense nanocrystalline Y-TZP, but recent work indicates that above a threshold stress, the principal deformation mechanism would be grain boundary sliding that results in superplastic flow. Questions on the deformation mechanism in the nanocrystalline Y-TZP are being addressed as part of a larger investigation of high-temperature compressive creep behavior, currently in progress.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 691328
- Journal Information:
- Scripta Materialia, Vol. 41, Issue 5; Other Information: PBD: 6 Aug 1999
- Country of Publication:
- United States
- Language:
- English
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