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http://dx.doi.org/10.4191/KCERS.2002.39.5.484

Cracks in Tape Cast Oxide Laminar Composites  

Kim, Ji-Hyun (School of Materials Science and Engineering, Pusan National University)
Yang, Tae-Young (School of Materials Science and Engineering, Pusan National University)
Lee, Yoon-Bok (School of Materials Science and Engineering, Pusan National University)
Yoon, Seog-Young (School of Materials Science and Engineering, Pusan National University)
Park, Hong-Chae (School of Materials Science and Engineering, Pusan National University)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.5, 2002 , pp. 484-489 More about this Journal
Abstract
Hot-pressure sintered laminar composites with alumina/zirconia or mullite/zirconia as an outer layer and alumina/zircon (resulting in reaction-bonded mullite/zirconia during sintering) as an inner layer were fabricated by tape casting and lamination. Various forms of crack were observed in sintered laminar composites, these cracks included channel cracks in the outer layer, transverse cracks in the inner layer and interface cracks debonding interlayer. Based on detailed microscopic observations, the cracks were attributed to thermal expansion mismatch between the oxides consisting of the each layer. In particular, the interlayer and transverse cracks were confirmed in the laminates consisted of the mullite/zirconia system as the outer layers, however, those cracks were not observed in the alumina/zirconia system used. In addition, the crack propagation did not exhibit same behavior in the two kinds of outer layer when the indentation load was applied.
Keywords
Tape casting; Laminar composites; Cracks; Indentation;
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