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Detailed Program
Paper Number : ST-O10
Time Frame : 14:00~14:20
Presentation Date : Friday, 28, November
Session Name : Structual Ceramics & Refractory materials
Session Chair 1# : Young-Wook Kim
Session Chair 2# : Kouichi Yasuda
Sintering of transparent polycrystalline Y2O3 by using graphite vacuum furnace
Young-Jo PARK
Korea Institute of Materials Science
Keywords: Y2O3, transparent, IR, window

Yttria (Y2O3) is an indispensable core ingredient in the various material-related fields just like the licorice (Êöõ®, «¢«Þ«¯«µ) in the Chinese medicine (ùÓÛ°). Some of the well-known examples include the usages as the sintering additive for some of the hardly sinterable ceramics, the stabilizer for zirconia, and the flame controller for magnesium alloy, and so forth. In addition, monolithic yttria by itself finds an important industrial application due to its excellent halogen plasma resistance. That is, bulk yttria and coated yttria are the key parts of the processing facility for the semiconductor/display industry.
In the current presentation, authors are going to focus on the excellence of yttria as a window material for the mid IR (2-5 ¥ìm) range. That is, the transmittance at high temperature regime is higher, while the emissivity at high temperature regime is lower than other window materials. Further, the transmittance of more than 80% is maintained over 5 ¥ìm wavelength. Consequently, the S/N (signal to noise) ratio through the yttria window is the highest among the known window materials.
The vigorous research activities have been reported on the sintering of transparent polycrystalline Y2O3. Somewhat different approach has been tried at KIMS by the vacuum sintering using the graphite heating element. Graphite furnace is the most widely established infra, therefore it is insisted that research at KIMS has an important industrial implication for the application of transparent ceramics. The mechanism for the development of transparency, transmittance, and strength of yttria sintered by graphite furnace will be provided at the presentation.
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