Heterogeneous junction of yttria partially stabilized zirconia by superplastic flow
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Heterogeneous junction of yttria partially stabilized zirconia by superplastic flow Arturo Dom´ınguez-Rodr´ıguez Departamento de F´ısica Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain
Fernando Guiberteau Departamento de F´ısica, Universidad de Extremadura, 61070 Badajoz, Spain
Manuel Jimenez-Melendo Departamento de F´ısica Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain (Received 27 March 1997; accepted 2 September 1997)
Layers of different composition and/or grain size of yttria partially stabilized zirconia (YPSZ) have been compressed, with the stress perpendicular to the interface of the layers and temperature of 1400 ±C, in order to produce a joint using the microstructural feature of superplasticity found in fine-grained ceramics. The pieces joined have been characterized by scanning electron microscopy (SEM), showing a clean interface with no cavitation. The stiffness of the junction was checked using Vickers indentation at room temperature at the interface and compression tests at the same conditions (T 1400 ±C in air) used for the joining and the stress parallel to the interface. The observation and comparison between the cracks developed around the indents at the interface and in the bulk of the pieces joined as well as the absence of cavities along the interface in the samples compressed parallel to the interface shows that this technique is useful to produce a joint with a clean and strong interface.
I. INTRODUCTION
The increasing applications of advanced ceramics in technical systems, in a wide range of temperatures, require complex shapes and large pieces at low economic cost. These ceramic applications come from their excellent strength, high resistance to wear and corrosion, etc. These requirements have generated a continued interest in the development of joining techniques which allow us to assemble complex structures from simple shapes. A wide range of ceramic joining techniques, depending on whether the materials to be joined are or are not the same (ceramic-ceramic, ceramic-metal, etc.), have been developed. For details see Refs. 1–3. Nowadays, the microstructural design of structural ceramics with improved mechanical performance for long term applications at low and high temperature is a very active and attractive field.4–8 One example of this microstructural design are the multilayer composites consisting of alternative layers of two materials ABAB. . .. Leading to improved fracture toughness7–9 or to better and anisotropic high temperature mechanical properties.10 Two techniques have been normally used to produce these multilayer composites: tape casting11 and sequential slip casting.12 Recently, the CerLOM has been developed for rapid prototyping of multilayer ceramic parts.13 In the CerLOM process, tape cast ceramic sheets (Cer) and an adapted laminated object manufacturing J. Mater. Res., Vol. 13, No. 6, Jun 1998
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