发明名称 |
Production of a nano-corundum used in the production of aluminum oxide sintered products uses chlorine-free inorganic precursors as starting material in a liquid medium to form a sol which is subsequently hydrolyzed |
摘要 |
Production of a nano-corundum comprises dissolving chlorine-free inorganic precursors as starting material in a liquid medium or processing to a sol; hydrolyzing the solution or sol by adding a base in a mole ratio of base: precursor of 1: 3; aging at 60-98 deg C for 1-72 hours; drying and then calcining at 350-650 deg C to convert the hydrolyzed precursor into a quasi-amorphous intermediate phase and subsequently into transitional alumina; and further calcining to convert into the corundum phase by raising the temperature to less than 950 deg C. Independent claims are also included for: (1) a nano-corundum powder produced from the process having an average particle size distribution D50 of less than 100 nm; and (2) a process for coating porous or sealed metallic substrates, in which the particles of the hydrolyzed sol or the particles of a suspension of nano-corundum are electrophoretically deposited onto a metallic substrate and subsequently calcined.
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申请公布号 |
DE19922492(A1) |
申请公布日期 |
2000.11.16 |
申请号 |
DE19991022492 |
申请日期 |
1999.05.14 |
申请人 |
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV |
发明人 |
KRELL, ANDREAS;MA, HONGWEI |
分类号 |
B01D71/02;C01F7/34;C01F7/36;C04B35/111;C04B35/624;C04B35/626;C04B38/00;C04B41/50;C04B41/87;C23C18/12;C25D13/02;(IPC1-7):C01F7/02;C04B35/10;C25D1/14 |
主分类号 |
B01D71/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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