| 학회 |
한국재료학회 |
| 학술대회 |
2012년 가을 (11/07 ~ 11/09, 라카이샌드파인 리조트) |
| 권호 |
18권 2호 |
| 발표분야 |
B. 나노재료(Nanomaterials) |
| 제목 |
Sintering behavior of Nano-sized Bi2O3-B2O3-ZnO Based Glass Powders |
| 초록 |
Recently, nano sized glass powders have been of interest due to the advantage on lowering sintering temperature and fast densification characteristic. The process of sintering glass powders has to be considered with two phenomena, crystallization and sintering. The driving force of sintering is surface energy, and viscous flow is a role of kinetic path to minimize the surface area. Crystallization hinders viscous flow during sintering, but it is only desirable for sintered glass-ceramic. Glass sintering with concurrent crystallization occurs in many cases, and they should be considered at the same time. In this study, we prepared nano sized glass powder and compared the size dependence on sintering and crystallization behavior for use of nano sized glass powder. The Bi2O3-B2O3-ZnO glass system of nano sized glass powder was synthesized by non-transferred DC thermal plasma process. Sintering behaviors of nano and micro sized glass powders were investigated by hot stage microscopy (HSM), differential scanning calorimetry and scanning electron microscopy. Change of crystal structure at several temperatures was analyzed by high temperature X-ray diffraction. Shrinkage starting temperature decreased 35oC in case of nano sized powder and the crystallization temperature was lowered 10oC than the micro sized glass powder. The result of HSM observation revealed that swelling of sintered body made of nano sized glass powder was taken place after finishing densification due to crystallization which prevented viscous flow. These phenomena are facilitated by wide specific surface area of nano glass powder. |
| 저자 |
Hyunjin Shim1, Sunghwan Cho2, Hyungsun Kim1
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| 소속 |
1School of Material Engineering, 2Inha Univ. |
| 키워드 |
Sintering behavior; Nano powder; Glass powder; Crystallization; Bismuth system glass
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| E-Mail |
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