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Microwave and conventional sintering of rapidly solidified Al2O3-ZrO2 powders

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Abstract

The Al2O3-ZrO2 eutectic composition was rapidly solidified, forming amorphous and crystalline structures. The as-quenched material was crushed and pressed into pellets which were sintered conventionally or with microwaves. Conventional and microwave sintering at temperatures up to 1600 °C resulted in a microstructure where 100–200 nm ZrO2 grains were present intergranularly in the α-Al2O3 grains. Larger ZrO2 grains (∼1 μm) were found intergranularly. The as-quenched lamellar structure spheroidized during sintering at high temperatures. Boron contamination of the powders resulted in more homogeneous and dense as-fired samples but promoted the ZrO2 tetragonal-to-monoclinic transformation, which was attributed to increased grain boundary diffusivity. Conventional sintering at low temperatures resulted in the formation of “rods” of an Al2O3-rich phase which grew from a low-melting B2O3-rich liquid.

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Authors and Affiliations

  1. Materials Science Program, University of California, 92093-0411, San Diego, La Jolla, CA, USA

    J. McKittrick & B. Tunaboylu

  2. Los Alamos National Laboratory, Mail Stop G771, 87545, Los Alamos, NM, USA

    J. Katz

Authors
  1. J. McKittrick
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  2. B. Tunaboylu
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  3. J. Katz
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McKittrick, J., Tunaboylu, B. & Katz, J. Microwave and conventional sintering of rapidly solidified Al2O3-ZrO2 powders. J Mater Sci 29, 2119–2125 (1994). https://doi.org/10.1007/BF01154689

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  • DOI: https://doi.org/10.1007/BF01154689

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