Nano-structured Alumina-ZrO2 ceramic laminates

Wilson Acchar,Sergio Augusto Nascimento De Franca Junior

doi:10.1590/s1517-707620190001.0656

Wilson Acchar, Sergio Augusto Nascimento De Franca Junior

Open Access

https://doi.org/10.1590/s1517-707620190001.0656

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Abstract

In the last years many efforts have been expended to develop colloidal process that uses water instead of organic solvents in the tape casting process. In present work, alumina/zirconia laminated nanocomposites were fabricated by layer-by-layer method and using water-based tape casting process. Physical and mechanical properties as well as the fracture mode were investigated. The laminates consisted of stacked alumina and zirconia green sheets produced by thermopressing. The ceramic laminates were first heated at 450°C (organic elimination) and subsequently sintered in air at 1500°C during 1 h. The ceramic laminates showed a mechanical strength of approximately 103 MPa (AZAZA) and 44 MPa (ZAZAZ), respectively and an intergranular-transgranular mixed fracture mode. Keywords: nanocomposites, laminates, tape casting .

Highlights

Nanostructured materials have received much attention in last decades, which can be attributed to the unusual physical and mechanical properties, such magneto resistance, unusual dielectric properties and high temperature mechanical properties [1-4]
Alumina/zirconia laminated nanocomposites were fabricated by layer-by-layer method and using water-based tape casting process
The laminate shows some cracks that are characteristic of the tape process

Summary

Introduction

Nanostructured materials have received much attention in last decades, which can be attributed to the unusual physical and mechanical properties, such magneto resistance, unusual dielectric properties and high temperature mechanical properties [1-4]. Tape casting is an effectively technique for making thin sheets and flat ceramic substrates and multilayer structures mainly for the electronic industry [5-7]. Water based tape casting process has been used, in order to avoid the toxic effects produced by organic solvents [11-12]. The use of alumina and zirconia as the constituent materials of ceramic laminates can be related to the excellent bonding between the layers in the absence of excessive diffusion between components, their good thermo-mechanical properties and their relatively ease of processing [13-14]. These characteristics make the two materials interesting candidates for the manufacture of ceramic laminates

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