Abstract
Multi-component ceramic composites consisting of two phases, three phases or four phases were fabricated by steric organic entrapment route employing polyethylene glycol (PEG) as a polymeric carrier. In the organic–inorganic complexation process for two-component (Al 2O 3–ZrO 2) system, the microstructure of sintered composites and relative volume fraction of the final phases were dependent on the polymer content. The PEG polymer affected the solubility and homogeneity of the metal cations in the solution, and it resulted in the variation of grain size range in the sintered microstructure. In three-component (Al 2O 3–ZrO 2–Y 2O 3 and Al 2O 3–ZrO 2–CeO 2) system, grain size was dependent on the mixing ratio of each component. In the Al 2O 3–ZrO 2–CeO 2 system, smallest grain size was obtained in the 1:1:0.5 mole ratio. In four-component (Al 2O 3–ZrO 2–Y 2O 3–SrO and Al 2O 3–ZrO 2–CeO 2–SrO) system, the grain size was more decreased and SrAl 12O 19 phase, which is needle-like shape, was observed.
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