Journal of Materials Science

, Volume 29, Issue 8, pp 2119–2125 | Cite as

Microwave and conventional sintering of rapidly solidified Al2O3-ZrO2 powders

  • J. McKittrick
  • B. Tunaboylu
  • J. Katz


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.


Polymer Microstructure Microwave Boron Crystalline Structure 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • J. McKittrick
    • 1
  • B. Tunaboylu
    • 1
  • J. Katz
    • 2
  1. 1.Materials Science ProgramUniversity of CaliforniaSan Diego, La JollaUSA
  2. 2.Los Alamos National LaboratoryLos AlamosUSA

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