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극초단파 레이저 강화 유리 기판의 기계적 특성평가(1)
문필용,윤덕기,이강택,윤병헌,조성학,류봉기,Moon Pil Yong,Yoon Duk ki,Lee Kang Taek,Yoo Byung Heon,Cho Sung Hak,Ryu Bong Ki 한국재료학회 2005 한국재료학회지 Vol.15 No.12
In order to reduce the weight of glass in architecture, automobile, bottles, displays, a new technique that can strengthen glass was developed using various method. Generally, the strength achieved of glass-ceramics is higher as is 1.he fracture toughness by the formation of a crystalline phase inside glass. In this study, $70SiO_2-20Na_2O-10CaO-10TiO_2$ glasses were irradiated to strengthen by heterogeneous phase using femto-second laser pulse. Laser pulse irradiation of samples was analyzed by DTA, TMA, XRD, nano-indenter and SEM. Samples irradiated by laser had lower value$(3\~4\times10^{-3}Pa)$ of nano indentation which related with mother glass$(8\times10-3Pa)$ than values. Microcracks were occurred around laser irradiation area when femtosecond laser with the repetition rate of 1kHz was used as the light source to induced heterogeneous phase.
Femto Second Laser Pulse에 의한 유리의 결정화 및 기계적 특성
차재민,문필용,김동현,박성제,조성학,류봉기,Cha, Jae-Min,Moon, Pil-Yong,Kim, Dong-Hyun,Park, Sung-Je,Cho, Sung-Rak,Ryu, Bong-Ki 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.6
Generally, the strength achieved of glass-ceramics is higher as is the fracture toughness, as compared with the original glass. This improvement is due to the microstructure consisting of very small crystals. In this study, Ag-doped $45SiO_2-24CaO-24Na_2O-4P_2O_5$ glasses were irradiated to strengthen by the crystallization using Femto second laser Pulses. Through the UV/VIS spectroscope, XRD, Nano-indenter and SEM etc., heat-treated and irradiation of laser pulses without heat-treated samples were analyzed. Two kinds of samples, heat-treated and laser irradiated without heat-treated samples, showed the peaks in the same wavelength near 360 nm. Especially, samples irradiated by 140 mW laser with XYZ stage having at the rate of 100$\~$l000 $\mu$m/s had the largest absorption peak among them, and heat-treated samples was shown lower absorption range than over 90 mW laser irradiated samples. Moreover, samples irradiated by laser had higher values ($4.4\~4.56{\times}10^{-3}(Pa)$) of elastic modulus which related with strength of glass than values of heat-treated samples and these are 1.2$\~$1 .5 times higher values than them of mother glass.
Femto Second Laser Pulse에 의한 유리의 결정화 기계적 특성
차재민,류봉기,문필용,김동현,박성제,조성학 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.6
Generally, the strength achieved of glass-ceramics is higher as is the fracture toughness, as compared with the original glass. This improvement is due to the microstructure consisting of very small crystals.In this study, Ag-doped 45SiO224CaO24Na2O4P2O5 glasses were irradiated to strengthen by the crystallization using Femto second laser pulses. Through the UV/VIS spectroscope, XRD, Nano-indenter and SEM etc., heat-treated and irradiation of laser pulses without heat-treated samples were analyzed.Two kinds of samples, heat-treated and laser irradiated without heat-treated samples, showed the peaks in the same wavelength near 360nm. Especially, samples irradiated by 140mW laser with XYZ stage having at the rate of 100~1000㎛/s had the largest absorption peak among them, and heat-treated samples was shown lower absorption range than over 90mW laser irradiated samples.Moreover, samples irradiated by laser had higher values (4.4 ~ 4.56 x 10-3(Pa)) of elastic modulus which related with strength of glass than values of heat-treated samples and these are 1.2 ~ 1.5 times higher values than them of mother glass.