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금속유기화학증착법으로 사파이어 기판에 증착된 단층 SiO<sub>2</sub>, TiO<sub>2</sub> 저반사막의 광 투과율, 내열성, 기계적 특성에 관한 연구
심규인,엄형우,강형,최세영,Shim, Gyu-In,Eom, Hyengwoo,Kang, Hyung,Choi, Se-Young 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.5
To improve sensing capability of infrared, heat-resistance and mechanical properties, the $SiO_2$ and $TiO_2$ anti-reflective layers were coated on sapphire substrate by MOCVD. The standard wavelength was 4,600nm, and the thickness of anti-reflective layers were 379 and 758nm in case of ${\lambda}/4$ and ${\lambda}/2$ of incident angle($65^{\circ}$), respectively. The $SiO_2$ and $TiO_2$ anti-reflective layers were coated 12.6 and 9.7nm/min of deposition rates by increasing oxygen pressure to set the ideal refractive index of 1.283. In case of $SiO_2({\lambda}/2)$ coating, the transmittance increased from 55.0 to 62.7%. The transmittance of $TiO_2({\lambda}/2)$ anti-reflective layer also increased from 55.0 to 64.8%. The flexural strength of $SiO_2({\lambda}/2)$ and $TiO_2({\lambda}/2)$ layer coated sapphire increased from 337.8 to 362.9 and 371.8MPa, respectively. The flexural strength at $500^{\circ}C$ of these materials also increased respectively to 304.5, 358.2MPa from 265.9MPa. From these results, we confirmed these materials can be used as transmission window of infrared light.
심규인,엄형우,최세영,Shim, Gyu-In,Eom, Hyengwoo,Choi, Se-Young 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.4
Transparent bulletproof windows play an important role in the munitions industry. The thickness of bulletproof windows including soda-lime silicate(SLS) glass, polyvinyl butyral, poly urethane, main defense(200MD), and safety film was reduced from 40mm to 29mm by adjustment of SLS glass laminated array. Borosilicate glasses generally have lower surface density and more excellent mechanical properties than SLS glass. Borosilicate glass was strengthened by ion exchange in the $KNO_3$ powder. The maximum mechanical properties were observed at $550^{\circ}C$ for 10min. The Vickers hardness, fracture toughness and 3-point bending strength of ion exchanged samples were about $775kg/mm^2$, $1.91MPa{\cdot}m^{1/2}$ and 764MPa each, which are about 27%, 149% and 249% higher than parent borosilicate glass, respectively. The penetration depth of K+ ion at $550^{\circ}C$ for 10min was $59.8{\mu}m$. As a result, the transparent bulletproof windows were predicted to be more lightweight by ion exchange of borosilicate glass. If the SLS glass for bulletproof windows is replaced by ion exchanged borosilicate glass, the bulletproof windows can be expected to be lightweight and thinner.
금속유기화학증착법으로 사파이어 기판에 증착된 단층 SiO2, TiO2 저반사막의 광 투과율, 내열성, 기계적 특성에 관한 연구
심규인,엄형우,강형,최세영 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.5
To improve sensing capability of infrared, heat-resistance and mechanical properties, the SiO2 and TiO2 antireflectivelayers were coated on sapphire substrate by MOCVD. The standard wavelength was 4,600nm, and thethickness of anti-reflective layers were 379 and 758nm in case of λ/4 and λ/2 of incident angle(65˚), respectively. The SiO2 and TiO2 anti-reflective layers were coated 12.6 and 9.7nm/min of deposition rates by increasing oxygenpressure to set the ideal refractive index of 1.283. In case of SiO2(λ/2) coating, the transmittance increased from55.0 to 62.7%. The transmittance of TiO2(λ/2) anti-reflective layer also increased from 55.0 to 64.8%. The flexuralstrength of SiO2(λ/2) and TiO2(λ/2) layer coated sapphire increased from 337.8 to 362.9 and 371.8MPa,respectively. The flexural strength at 500℃ of these materials also increased respectively to 304.5, 358.2MPa from265.9MPa. From these results, we confirmed these materials can be used as transmission window of infrared light.