การเตรียมแก้วสีแดงทับทิมโดยใช้ทองคำเปลวด้วยวิธีเซลฟ์สไตรกิง
The self-striking gold ruby glass was developed in order to obtain a red color glass without an additional heat treatment. The purpose is to reduce the energy consumption and to stabilize the shade of color. The base glass composition of 71.29 SiO2, 10.89 CaO, 10.89 Na2O, 0.99 PbO, 5.94 K2O (in wt....
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| 格式: | Theses and Dissertations |
| 語言: | Thai |
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จุฬาลงกรณ์มหาวิทยาลัย
2009
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| 主題: | |
| 在線閱讀: | https://digiverse.chula.ac.th/Info/item/dc:34944 |
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| 機構: | Chulalongkorn University |
| 語言: | Thai |
| 總結: | The self-striking gold ruby glass was developed in order to obtain a red color glass without an additional heat treatment. The purpose is to reduce the energy consumption and to stabilize the shade of color. The base glass composition of 71.29 SiO2, 10.89 CaO, 10.89 Na2O, 0.99 PbO, 5.94 K2O (in wt. %) was used in this study. The effect of additive contents, annealing temperature and time, residual stress in the forming process and kinetic of self-striking mechanism were investigated. Additive agents used in this study were SeO2 50-100 ppm as a reducing agent, C 0-0.2 %wt as a redox controller. The gold carrier which was doped in the amount of 200-450 ppm was gold foils which are so common in Thailand instead of the expensive gold (iii) chloride. In the preliminary test, a stripe of uneven red color in glass was detected. The study of the effect of temperature and time in the annealing process indicated that after 1 and 2 hours of annealing at 600 oC, the color of glass turned into purple and blue, respectively due to the high residual stress. The residual stress caused the shifting of the absorption peak of gold nanoparticles which resulted in the unwanted colors. The kinetic of self-striking mechanism was studied by UV-VIS spectrophotometer accompanied with a heating stage in order to determine a precise annealing schedule and to increase the uniformity of the red color in self-striking glass. The effect of pouring technique on the residual stress was study by Strain imaging polarimeter. The result in stress distribution pattern shows relation between internal stress and striking color. The best condition to produce uniform color self-striking gold ruby glass is the glass no.9 pours at the center of a sample and striked at 650oC for 1 hr and annealing at 570 °C for 30 minutes during cooling schedule. |
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