Modified (core) θ-Al2O3@ (shell) polyethylene glycol (PEG) technology was used to prepare α-Al2O3 green compacts composed of <100-nm α-Al2O3 crystallites using θ-Al2O3 as the starting material. The preparation process has two steps. In the first step, θ-Al2O3 compacts in which alumina crystallites were apart individually after the removal of PEG were made. In the second step, the θ-Al2O3 was transformed into α-Al2O3.The compact showed phase purity of >85% α-Al2O3 with crystallites sizes ranging from 50 to 100 nm and the compact density was >60% of the theoretical value.
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