Hostname: page-component-848d4c4894-cjp7w Total loading time: 0 Render date: 2024-07-05T09:37:11.122Z Has data issue: false hasContentIssue false
  • English
  • Français

Crystallization kinetics of BaO–Al2O3–SiO2 glasses

Published online by Cambridge University Press:  31 January 2011

Narottam P. Bansal  and
Mark J. Hyatt
Narottam P. Bansal
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135
Mark J. Hyatt
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135
Get access

Abstract

Barium aluminosilicate glasses are being investigated as matrix materials in high-temperature ceramic composites for structural applications. Kinetics of crystallization of two refractory glass compositions in the barium aluminosilicate system have been studied by differential thermal analysis (DTA), x-ray diffraction (XRD), and scanning electron microscopy (SEM). From variable heating rate DTA, the crystallization activation energies for glass compositions (wt. %) 10BaO–38Al2O3–51SiO2–1MoO3 (glass A) and 39BaO–25Al2O3–35SiO2–1MoO3 (glass B) were determined to be 553 and 558 kJ/mol, respectively. On thermal treatment, the crystalline phases in glasses A and B were identified as mullite (3Al2O3 · 2SiO2) and hexacelsian (BaO · Al2O3 · 2SiO2), respectively. Hexacelsian is a high-temperature polymorph which is metastable below 1590 °C. It undergoes structural transformation into the orthorhombic form at ∼300 °C accompanied by a large volume change which is undesirable for structural applications. A process needs to be developed where stable monoclinic celsian, rather than hexacelsian, precipitates out as the crystal phase in glass B.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 5 , October 1989 , pp. 1257 - 1265
Copyright
Copyright © Materials Research Society 1989

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Levin, E. M. and McMurdie, H. F., Phase Diagrams for Ceramists-1975 supplement (The American Ceramic Society, Columbus, OH, 1975), p. 220.Google Scholar
2Bansal, N.P. and Doremus, R.H., J. Thermal Anal. 29, 115 (1984).CrossRefGoogle Scholar
3Johnson, W. A. and Mehl, R.F., Trans. Am. Inst. Elect. Eng. 135, 416 (1939).Google Scholar
4Avrami, M., J. Chem. Phys. 7, 1103 (1939); 8, 212 (1940); 9, 177 (1941).Google Scholar
5Bansal, N. P., Doremus, R. H., Bruce, A. J., and Moynihan, C. T., J. Am. Ceram. Soc. 66, 233 (1983).Google Scholar
6Bansal, N. P., Bruce, A. J., Doremus, R. H., and Moynihan, C. T., J. Non-Cryst. Solids 70, 379 (1985).Google Scholar
7Bansal, N.P., Bruce, A.J., Doremus, R. H., and Moynihan, C.T., in “Infrared Optical Materials and Fibers III,” Proc. SPIE 484, 51 (1984), Soc. Photo-Optical Instr. Engr., Bellingham, WA.Google Scholar
8Hammetter, W.F. and Loehman, R.E., J. Am. Ceram. Soc. 70, 577 (1987).Google Scholar
9Bahat, D., J. Mater. Sci. 4, 855 (1969).Google Scholar
10Corral, J. S. Moya and Verduch, A. Garcia, Trans. J. Br. Ceram. Soc. 77, 40 (1978).Google Scholar
11Bahat, D., J. Mater. Sci. 4, 847 (1969).Google Scholar
12Stookey, S.D., Glastech. Ber. 32, 1 (1959).Google Scholar
13Vonnegut, B., J. Appl. Phys. 18, 593 (1947).Google Scholar
14Ito, T., X-ray Studies on Polymorphism (Maruren Co. Ltd., Tokyo, Japan, 1956).Google Scholar
15Newnham, R.E. and Megaw, H.D., Acta Cryst. 13, 303 (1960).Google Scholar
16Bahat, D., J. Mater. Sci. 5, 805 (1970).CrossRefGoogle Scholar
17Yoshiki, M. and Matsumoto, K., J. Am. Ceram. Soc. 34, 283 (1951).Google Scholar
18Drummond, C. H., Lee, W. E., Bansal, N. P., and Hyatt, M. J., paper presented at the 13th Annual Conference on Composites Materials and Structures, Restricted Sessions, Cocoa Beach, FL, Jan. 18-20, 1989; Ceram. Eng. Sc. Proc. (to be published).Google Scholar