Prepn. of submicron high-purity transparent alumina ceramic material |
Title： |
| Prepn. of submicron high-purity transparent alumina ceramic material |
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Application Number： |
02123648 |
Application Date： |
2002/07/05 |
Announcement Date： |
2003/01/08 |
Pub. Date： |
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Publication Number： |
1389428 |
Announcement Number： |
1182069 |
Grant Date： |
2004-12-29 |
Granted Pub. Date： |
2004-12-29 |
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
C04B 35/10, C04B 35/622, C04B 35/64 |
Applicant(s)： |
Tsinghua Univ. |
Inventor(s)： |
Si Wenjie, Liu Dapeng, Miao Hezhuo |
Key Words： |
Prepn., submicron, high-purity transparent, alumina ceramic material |
Abstract： |
The preparation method of submicron high-purity transparent alumina ceramic material includes the following steps: using static pressure process of dry-pressing and cooling, etc. to mould alpha-Al2O3 powder; then pressure-less presintering these blank bodies, its pressure-less presintering temp. is 1200-1350 deg.C, and time is 30-480 min.; placing these presintered blank bodies into thermal isostatic pressing furnace to make after-treatment, its treatment temp. is 1150-1350 deg.C, pressure is 140-190 Mpa, heat-insulating and pressure-retaining time is 30-60 min.; using Ar gas as protective gas, the relative density of obtained ceramic body is greater than 99.9%, finally grinding surface of sintered ceramic body and polishing. Its grain size is less than 1 micro, it possesses high transparence and mechanical properties, can be suitable for making high-voltage sodium lamp tube, high-temp. furnace window and decorative material. |
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| Last Update |
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2008-4-17 |
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Selected patents owned by Tsinghua University filed in 2005 are loaded. |
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2008-3-31 |
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Selected patents owned by Tsinghua University filed in 2006 and 2007 are load. |
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