Forming of Ceramic Laminates Comprising Thin Layers of a Few Particles
In this paper, a water-based colloidal processing method for manufacturing multilayers with very thin zirconia layers between thick alumina-based layers is presented. The procedure involves the dip coating of green tapes in binder-containing slurries and further lamination and sintering. Dipping studies show that thickness increases with soaking time until a higher limit is achieved, indicating the existence of interaction between slurry and substrate. After sintering, homogeneous, dense, and continuous zirconia layers with thicknesses between 3 and 0.8 m alternated with 350 m layers of alumina are obtained, thus meaning that the cross section of these thin layers range from four or five to only one or two grains. Although the residual stresses are estimated to be around 2 GPa, indentation cracks do not shown any interaction when passing through the compressive layers, indicating the existence of a lower thickness limit to achieve a threshold stress.
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Document Type: Research Article
Affiliations: Ceramics Department, Instituto de Cerámica y Vidrio—CSIC, 28049 Madrid, Spain
Publication date: 01 July 2008