| 摘要 |
PCT No. PCT/EP94/00272 Sec. 371 Date Sep. 30, 1994 Sec. 102(e) Date Sep. 30, 1994 PCT Filed Jan. 31, 1994 PCT Pub. No. WO94/18140 PCT Pub. Date Aug. 18, 1994A ceramic moulded body containing at least 10 vol. % fine-grained Al2O3, and a process for its production (a) milling aluminium metal in powder form alone or together with Al2O3 or/and if desired further suitable inorganic substances for ceramic formation in a non-aqueous liquid in the presence of oxygen until 10 to 80% of the metallic aluminium powder has reacted to form one or several aluminium oxidation precursors from the group amorphous Al2O3, gamma -Al2O3 and aluminium-organic compounds and the powder has a maximum oxidation rate between 510 DEG and 610 DEG C. according to differential thermoanalytical measurement; (b) molding the powder of step (a) into a green body; (c) slowly heating the green body in an atmosphere containing oxygen to a temperature which is below the melting temperature of aluminium until at least 50% of the metallic aluminium powder remaining after the milling has reacted to Al2O3; and subsequently (d) sintering the moulded body at 1100 DEG to 1650 DEG C. or (e) applying the powder obtained in step (a) onto a substrate by means of flame or plasma spraying in the presence of oxygen.
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