| Fabrication of transparent amorphous silica by controlling forming and sintering processes with spherical nano-silica powder |
| Yoo Kyoung Ahn1,2, Dong Hwi Kim1, Hyung Sup Lim3, Sang Jin Lee1,2 |
1Department of Advanced Materials Science and Engineering, Mokpo National University, Muan 58554, Republic of Korea
2Research Institute of Ceramic Industry and Technology, Mokpo National University, Muan 58554, Republic of Korea
3SukgyungAT, Ansan 15599, Republic of Korea |
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Received: October 17, 2021; Revised: July 2, 2022 Accepted: July 17, 2022. Published online: October 4, 2022. |
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| ABSTRACT |
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Quartz glass with excellent optical, chemical, and thermal properties was manufactured by a new method using sintering rather than the existing glass manufacturing method involving melting and synthesis. With a spherical amorphous nano-silica powder, by controlling the forming and sintering conditions, the optimum conditions for producing a light-transmitting bulk silica were studied. By sintering at 1325 °C for a short time and exploiting the densification behavior derived from viscous flow, pores and grain boundaries in the sintered body were removed, and it was possible to manufacture a translucent silica body. However, with slightly excess sintering, the crystallization of cristobalite progressed and the transmittance consequently showed a tendency to decrease again. To obtain an amorphous silica sintered body, crystal formation was prevented by sintering at 1215 °C for 24 h, which is a relatively lower temperature than the crystallization temperature. It was also possible to produce light-transmitting bulk silica via a powder compact forming method using cold isostatic pressure at 200 MPa. Finally, it was found that, using the new manufacturing process, it is possible to manufacture quartz glass in complex shapes or a small and thin forms. |
| Key words:
Silica powder · Crystallization · Viscous flow sintering · Transparency · Quartz glass |
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