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Vol.53, No.12, 883 ~ 890, 2015
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| Title |
| Sintering and of ZnS by Hot Pressing (HP) and Spark Plasma Sintering (SPS) and Optical Properties of Sintened Materical |
| 홍연우 Youn Woo Hong , 김유비 You Bi Kim , 이영진 Young Jin Lee , 김세기 Sei Ki Kim , 백종후 Jong Hoo Paik , 김진호 Jin Ho Kim |
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| Abstract |
| The sintering behaviors of commercial ZnS nanopowders (purity 99.999%) processed with the two different sintering techniques of hot pressing (HP) and spark plasma sintering (SPS) and optical properties of sintered material are investigated here. The results are compared between the two different sintering techniques in terms of the sintering parameters (density, microstructure, X-ray diffraction pattern) and the optical properties (infrared transmission in the range of 2~20 μm) of the sintered ZnS ceramics. The maximum density was obtained at 950℃ irrespective of the sintering method. The wurtzite (hexagonal) phase causes birefringence due to optical anisotropy which begins at a temperature of more than 920℃. The optimized optical properties were found to be ZnS ceramics sintered with HP at 950℃ and with SPS at 90 0℃. However, contamination from the graphite mold and its influence on the optical properties were confirmed to be very serious, especially in HP and SPS. In the SPS method, the optical properties by light scattering were found in this study to worsen considerably due to the refractive index differences among the ZnS, carbon impurities, and pores. |
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| Key Words |
| ZnS, hot press, spark plasma sintering, sintering, optical property |
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