Skip to main content Accessibility help
×
Home

Determination of shear viscosity of borosilicate glass + silica powder compacts by an optical system

  • Jaecheol Bang (a1), Guo-Quan Lu (a1) and Jesus Noel Calata (a1)

Abstract

The shear viscosity of borosilicate glass (BSG) + silica powder compacts was determined during isothermal sintering at temperatures between 665 and 715°C. An optical system was used to measure in situ the densification profiles of the compacts in the form of thick films constrained on a rigid substrate and in-plane stresses generated during sintering. The shear viscosity as a function of relative density was calculated from these measurements by using Scherer's viscous constitutive equations for a porous sintering body. The shear viscosity for samples with silica contents from 0 to 20 vol% generally showed a slow increase with density in the low-density regime followed by a rapid rise after some threshold density that decreased with either increasing silica powder content or decreasing sintering temperature. The dependence of shear viscosity on relative density is consistent with results from sinter-forging experiments. However, results obtained from pure BSG compacts also revealed strong dependence of shear viscosity on temperature and microstructure, which has been all but neglected in previous theoretical studies.

Copyright

References

Hide All
1.Rahaman, M.N., De Jonghe, L. C., and Brook, R.J., J. Am. Ceram. Soc. 69 (1), 5358 (1986).
2.Venkatachari, K.R. and Raj, R., J. Am. Ceram. Soc. 69 (6), 499506 (1986).
3.Rahaman, M.N., De Jonghe, L. C., Scherer, G.W., and Brook, R.J., J. Am. Ceram. Soc. 70 (10), 766774 (1987).
4.Bordia, R.K. and Raj, R., J. Am. Ceram. Soc. 71 (4), 302310 (1988).
5.Ducamp, V.C. and Raj, R., J. Am. Ceram. Soc. 72 (5), 798804 (1989).
6.Sura, V.M. and Panda, P. C., J. Am. Ceram. Soc. 73 (4), 26972701 (1988).
7.Dutton, R.E. and Rahaman, M.N., J. Am. Ceram. Soc. 75 (8), 21462154 (1992).
8.Scherer, G.W., J. Non-Cryst. Solids 34, 239256 (1979).
9.Bordia, R.K. and Scherer, G. W., Acta Metall. 36, 23932397 (1988).
10.Lu, G-Q., Sutterlin, R. C., and Gupta, T. K., J. Am. Ceram. Soc. 76 (8), 19071914 (1993).
11.Bang, J. and Lu, G-Q., J. Mater. Res. 10, 13211326 (1995).
12.Bang, J. and Lu, G-Q., J. Am. Ceram. Soc. 78 (3), 813815 (1995).
13.Scherer, G.W., Mechanics of Granular Materials and Powder Systems (ASME, New York, 1992), Vol. 37, pp. 118.
14.Jagota, A., Mikeska, K. R., and Bordia, R. K., J. Am. Ceram. Soc. 73 (8), 22662273 (1990).

Determination of shear viscosity of borosilicate glass + silica powder compacts by an optical system

  • Jaecheol Bang (a1), Guo-Quan Lu (a1) and Jesus Noel Calata (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed