| US 7,576,022 B2 | ||
| Aluminum-and magnesium-based molten ceramic grains | ||
| Samuel Marlin, Plan d'Orgon (France) | ||
| Assigned to Saint-Gobain Centre de Recherches et d'Etudes Europeen, Courbevoie (France) | ||
| Appl. No. 10/553,438 PCT Filed Apr. 15, 2004, PCT No. PCT/FR2004/000927 § 371(c)(1), (2), (4) Date Oct. 14, 2005, PCT Pub. No. WO2004/094554, PCT Pub. Date Nov. 04, 2004. |
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| Claims priority of application No. 03 04820 (FR), filed on Apr. 17, 2003. | ||
| Prior Publication US 2006/0196123 A1, Sep. 07, 2006 | ||
| Int. Cl. C04B 35/03 (2006.01); C04B 35/04 (2006.01); C04B 35/44 (2006.01); C04B 35/00 (2006.01); B24D 3/02 (2006.01); C09C 1/68 (2006.01); C09K 3/14 (2006.01) | ||
| U.S. Cl. 501—119 [501/108; 501/118; 501/120; 501/121; 501/153; 51/307; 51/309] | 11 Claims |
| 1. Fused ceramic grains having the following average chemical composition by weight, in percentages by weight on the basis
of the oxides:
Al2O3: 93% to 98.5%;
MgO: 2.2 to 6.5%;
SiO2:<0.1%;
other impurities:<0.4%,
wherein the maximum carbon content is 200 ppm, and
wherein the grains consist of corundum crystals surrounded by a nonstoichiometric MgO-Al2O3spinel phase.
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