| US 7,575,736 B2 | ||
| Process for the production of ultrafine plate-like alumina particles | ||
| John Sydney Robinson, Iluka (Australia); Lara Michelle Heatley, San Francisco, Calif. (US); Takuya Tsuzuki, Winthrop (Australia); David Andrew Lee, Cottesloe (Australia); and Paul Gerard McCormick, Nedlands (Australia) | ||
| Assigned to Advanced Nano Technologies Pty. Ltd., Welshpool (Australia) | ||
| Appl. No. 10/541,471 PCT Filed Jan. 06, 2004, PCT No. PCT/AU2004/000005 § 371(c)(1), (2), (4) Date Feb. 15, 2006, PCT Pub. No. WO2004/060804, PCT Pub. Date Jul. 22, 2004. |
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| Claims priority of application No. 2003900030 (AU), filed on Jan. 07, 2003. | ||
| Prior Publication US 2006/0153769 A1, Jul. 13, 2006 | ||
| Int. Cl. C01F 7/02 (2006.01) | ||
| U.S. Cl. 423—625 [423/630] | 17 Claims |
| 1. A process for the production of plate-like alumina particles comprising the steps of:
forming a mixture of nano-sized particles of an aluminium precursor compound and a sufficient volume fraction of a diluent,
wherein the sufficient volume fraction of the diluent is at least 80% of the total volume of the mixture; and
heat treating the mixture to form substantially discrete plate-like alpha alumina particles dispersed in the diluent, the
plate-like particles having an aspect ratio of width to diameter in the range of 1:10 and 1:100, wherein the step of heat
treating the mixture is conducted below the melting point of the diluent.
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