ZnO가 포함된 BaO-GeO2-La2O3 계 광학 유리 특성
The properties of optical glass of BaO-GeO2-La2O3 system with ZnO
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초록
3~5 μm 범위의 중적외선에서 75 % 이상의 투과율을 갖는 BaO-GeO2-La2O3-ZnO 계 유리를 제조 및 특성을 평가하였다. Flow button test를 통해 유리 용융이 가능한 조성을 선택 후, ZnO를 10 mol%, 20 mol% 각각 첨가하여 1350°C에서1시간 동안 용융하여 BaO-GeO2-La2O3-ZnO 계 유리를 제조하였다. 이 중에서 ZnO를 20 mol% 포함하는 16 mol% BaO- 56 mol% GeO2-8 mol% La2O3-20 mol% ZnO 계 유리 전이 온도 660°C 이하, 굴절률 1.70 이상, Knoop 경도 530 이상 값을가지는 것을 확인하였다. 따라서, ZnO를 20 mol% 포함하는 BaO-GeO2-La2O3-ZnO 계 유리는 저온에서 양호한 용융 상태와우수한 광학적 특성을 확인하였고 특수 광학용 재료 분야에 충분히 활용이 가능하리라 판단되었다.
Abstract
The glass of BaO-GeO2-La2O3-ZnO system with a transmittance of more than 75 % at mid-wave infrared (MWIR) region in the range of 3 μm to 5 μm is manufactured and its property is evaluated. After selecting construction that can melt glass through flow button test, BaO-GeO2-La2O3 system where 10 mol%, 20 mol% of ZnO were added respectively were melted at 1350°C for 1 hour and BaO-GeO2-La2O3 system of glass was manufactured. Among them, with 20 mol% of ZnO, 16 mol% BaO-56 mol% GeO2-8 mol% La2O3-16 mol% ZnO system of glass was found to has less than 660°C of glass transition temperature, more than 1.70 of refractive index, and more than 530 of knoop hardness. Therefore, it is concluded that glass of BaO-GeO2-La2O3-ZnO system of glass with 20 mol% ZnO has good melting conditions at low temperatures and excellent optical properties, thus, can be utilized for special optical materials field.
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