Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Effects of Molding Pressure and Sintering Temperature on Properties of Foamed Glass without Blowing Agent

  • Kim, EunSeok (Department of Materials Science and Engineering, University of Seoul) ;
  • Kim, Kwangbae (Department of Materials Science and Engineering, University of Seoul) ;
  • Lee, Hyeryeong (Department of Materials Science and Engineering, University of Seoul) ;
  • Kim, Ikgyu (Department of Materials Science and Engineering, University of Seoul) ;
  • Song, Ohsung (Department of Materials Science and Engineering, University of Seoul)
  • Received : 2019.01.15
  • Accepted : 2019.02.11
  • Published : 2019.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

A process of fabricating the foamed glass that has closed pores with 8 ~ 580 ㎛ sizes without a blowing agent by sintering 10 ㎛ boron-free glass powder composed of CaO, MgO, SO3, Al2O3-83 wt% SiO2 at a molding pressure of 0 ~ 120 MPa and a sintering temperature of 750 ~ 1000℃ was investigated. To analyze the glass transition temperature of glass powder, thermogravimetric analysis-differential thermal analysis (TGA-DTA) method were used. The microstructure and pore size of foamed glass were examined using the optical microscopy and field emission scanning electron microscopy (FE-SEM). For the thermal diffusivity and color of the fabricated samples, a heat flow meter and ultraviolet-visible-near-infrared (UV-VIS-NIR)-colormetry were used, respectively. In the TGA-DTA result, the glass transition temperature of glass powder was confirmed to be 626℃. In the microstructure result, closed pores of 7 ~ 20 ㎛ were formed at 750 ~ 900℃, and they were not affected by the molding pressure and sintering temperature. However, at 1,000℃, when there was 0 MPa molding pressure, closed pores of 580 ㎛ were confirmed, and the pore size decreased as the molding pressure increased. Moreover, at a molding pressure of 30 MPa or higher, closed pores of approximately 400 ㎛ were formed. The porosity showed an increasing trend of smaller molding pressure and larger sintering temperature, and it was controllable in the range of 5.69 ~ 68.45%. In the thermal diffusivity result, there was no change according to the molding pressure, and, by increasing the sintering temperature, up to 0.115 W/m·K could be obtained. The Lab color index (CIE-Lab) results all showed a similar translucent white color regardless of molding pressure and sintering temperature. Therefore, based on the foamed glass without boron and blowing agent, it was confirmed that white foamed glass, which has closed pores of 8 ~ 580 ㎛ and a thermal diffusivity characteristic of 0.115 W/m·K, can be fabricated by changing the molding pressure and sintering temperature.

Keywords

References

  1. J. K. Park and J. S. Lee, "Preparation of Porous Inorganic Materials by Foaming Slurry," J. Korean Ceram. Soc., 35 [12] 1280-85 (1998).
  2. C. T. Lee, "The Recycling of Waste Glass - Manufacture of Foamglass and its Prospect," J. Ind. Eng. Chem., 3 [2] 1-15 (2000).
  3. C. T. Lee, "Production Process of Foamed Glass by Compressive Shaping," Appl. Chem. Eng., 24 [3] 239-46 (2013).
  4. S. J. Chae, M. G. Park, and W. H. Kang, "Preperation and Properties of Fine Porous Glass," JKAIS, 10 [3] 476-81 (2009).
  5. D. Carta, D. Qiu, P. Guerry, I. Ahmed, E. A. A. Neel, J. C. Knowles, M. E. Smith, and R. J. Newport, "The Effect of Composition on the Structure of Sodium Borophosphate Glasses," J. Non-Cryst. Solids, 354 [31] 3671-77 (2008). https://doi.org/10.1016/j.jnoncrysol.2008.04.009
  6. C. T. Lee, H. G. Lee, and E. H. Um, "Production of Foamed Glass by Using Hydrolysis of Waste Glass - Foaming Process of Hydrated Glass," J. Ind. Eng. Chem., 16 [6] 760-67 (2005).
  7. H. Y. Cho, H. J. Kim, P. K. Chang, C. H. Choi, and S. W. Lee, "A Study on the Physical Characteristics of Foaming Glass by Recycling Waste Glass," J. Korea Acad. Ind. Coop. Soc., 6 [6] 473-77 (2005).
  8. Y. W. Kim, J. H. Song, and O. S. Song, "Properties of the Natural and CVD Synthetic Diamonds for Identification," J. Korean Ceram. Soc., 51 [4] 350-56 (2014). https://doi.org/10.4191/kcers.2014.51.4.350
  9. L. Meng, M. Kanezashi, and T. Tsuru, "Catalytic Membrane Reactors for $SO_3$ Decomposition in Iodinee Sulfur Thermochemical Cycle: A Simulation Study," Int. J. Hydrogen Energy, 40 [37] 12687-96 (2015). https://doi.org/10.1016/j.ijhydene.2015.07.124
  10. W. E. Wentworth and E. Chen, "Simple Thermal Decomposition Reactions for Storage of Solar Thermal Energy," Sol. Energy, 18 [3] 205-14 (1976). https://doi.org/10.1016/0038-092X(76)90019-0
  11. S. H. Kwon and D. C. Cho, "A Study on Thermal Conduction in Oyster Shell Incorporating Gypsum Objects," Clean Technol., 19 [2] 90-4 (2013). https://doi.org/10.7464/ksct.2013.19.2.090
  12. T. S. Yun, Y. J. Jeong, T. S. Han, and K. S. Youm, "Evaluation of Thermal Conductivity for Thermally Insulated Concretes," Energy and Buildings, 61 125-32 (2013). https://doi.org/10.1016/j.enbuild.2013.01.043
  13. T. Log, "Transient Hot−Strip (THS) Method for Measuring Thermal Conductivity of Thermally Insulating Materials," Fire Mater., 17 [3] 131-38 (1993). https://doi.org/10.1002/fam.810170306
  14. W. H. Park, S. Y. Oh, S. W. Ju, and J. S. Ahn, "Color and Translucency Change by Polymerization of Various Resin Composites," Korean J. Dental Mater., 37 [1] 110-16 (2010).

Cited by

  1. Properties of foamed glass upon addition of nanocarbon and sintering temperatures vol.8, pp.1, 2019, https://doi.org/10.1080/21870764.2020.1712798
  2. Properties of basalt-fiber reinforced foam glass vol.8, pp.1, 2019, https://doi.org/10.1080/21870764.2020.1718858
  3. Closed porosity ceramics and glasses vol.103, pp.5, 2020, https://doi.org/10.1111/jace.16934