成果報告書詳細
管理番号20160000000663
タイトル*平成27年度中間年報 SIP(戦略的イノベーション創造プログラム)/革新的設計生産技術 ガラス部材の先端的加工技術開発   
公開日2016/8/5
報告書年度2015 - 2015
委託先名国立大学法人京都大学 国立研究開発法人産業技術総合研究所 石塚硝子株式会社 日本電気硝子株式会社
プロジェクト番号P14030
部署名IoT推進部
和文要約
英文要約Title: SIP (Cross-Ministerial Strategic Innovation Promotion Program) / Innovative Design/Manufacturing Technologies. Development of advanced glass processing technologies (FY2014-FY2018) FY2015 Annual Report

1. Large-area precision molding technology: In the study on viscoelastic properties of glasses, it was found that temperature dependence of shift factor was similar to each other in Na2O-, Li2O-SiO2 glasses, except BK7. A simulator for estimation of viscoelasticity of glass on the basis of molecular dynamics and its visualization was developed. Deformation of small glass samples under applied pressure was successfully simulated. In the study on the reactions between a mold and glasses, it was found that the area of mold/glass interface increased during reaction, although the contact angle was unchanged in some experimental conditions, indicating that the compositions of glass and mold near the interface are unchanged during reaction. A microlens array was successfully fabricated on a 4 inch glass wafer with a PV value of less than 2 micron meters. In addition, we made an attempt to fabricate a SiC mold for microlens by a dry etching method. 2. Injection molding for rapid production of complex shaped products: We have succeeded in preparing phosphate glasses by heating the liquid solution at 400 deg C for 10-30 min, without using oxide powders. In addition, we have prepared a hybrid glass exhibiting the re-melting property at 120 deg C, from organically-modified alkoxysilane. The hybrid glass had a transmittance of 90% in the visible-ray region and possessed the stable viscosity curve after several melting cycles. Furthermore, it was possible to raise the re-melting temperature to 170 deg C by changing the bridging agent. In the injection molding test, dumbbell shaped samples were fabricated with a molding efficiency of about 90%, using an organic-inorganic hybrid glass. Moreover, we have succeeded in fabricating small lenses by injection molding. 3. Fast and precise cutting and joining technologies: We have revealed the mechanisms of the material modification including the laser polarization effect and the time-lag irradiation effect by the double-pulse configuration. The material modification by the double pulse configuration was twice as large as that induced by the conventional single pulse train. It was clearly suggested that the multiple pulse trains are also higher speed and efficient laser-processing condition, even in the case of picosecond laser. By combining the irradiation conditions mentioned-above, we have confirmed the possibility of precise cutting with cutting speeds from 100 to 300mm/sec. Laser welding of two glass sheets of different compositions was conducted using femtosecond lasers of high and low repetition rates. It was found that the width of the molten region depended on the direction of laser focusing. In addition, although some elements were concentrated at the boundary of the molten region in the single laser irradiation, these elements were mixed inside the molten region in the parallel laser irradiation. Furthermore, application of picosecond laser irradiation and near-IR laser irradiation for welding was examined.
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