Skip to main content
×
×
Home

Temperature effect on nonhydrolytic foaming process

  • G. S. Grader (a1), Y. de Hazan (a1), G. Natali (a1), T. Dadosh (a1) and G. E. Shter (a1)...
Abstract

This paper describes the effect of temperature on the formation of nonhydrolytic alumina foams. The foams are generated by heat treatment of crystals of the aluminum chloride isopropyl ether complex [AlCl3(Pri2O)], with the release of isopropyl chloride (PriCl). The chlorine content in the foams was determined by titration, and their weight loss during sintering was measured by thermogravimetric and differential thermal analysis. Based on these measurements, the condensation degree (CD) in the foams was modeled. The foaming time ranged from several minutes at 70 °C to several seconds at 160 °C. It was found that the chlorine-to-aluminum ratio of the foam (Cl/Al) decreased from 1.79 at 70 °C to 1.56 at 160 °C. Thermogravimetric analysis data confirm that the smaller Cl content gives rise to a smaller weight loss during thermal decomposition, consistent with a higher CD in the foams created at higher temperatures. Finally, about 80% of the PriCl produced during complex decomposition and subsequent –Al–O–Al– condensation reactions is lost during foaming.

Copyright
References
Hide All
1.Grader G.S., Shter G.E., and de Hazan Y., Israeli Patent Application No. 123 969 (1998).
2.Grader G.S., de Hazan Y., and Shter G.E., in Sol-Gel Processing, Proceedings of the American Ceramic Society Annual Meeting, edited by Komarneni S. (American Ceramic Society, 1998).
3.Grader G.S., de Hazan Y., and Shter G.E., J. Mater. Res. 14, 1485 (1999).
4.Brockmeyer J.W., U.S. Patent No. 4 610 832 (9 Sept 1986).
5.Lange F.F. and Miller K.T., Adv. Ceram. Mater. 2, 827 (1987).
6.Fujiu T., Messing G.L., and Huebner W., J. Am. Ceram. Soc. 73, 85 (1990).
7.Wu M. and Messing G., J. Am. Ceram. Soc. 73, 3497 (1990).
8.Sepulveda P., Am. Ceram. Soc. Bull. 76, 61 (1997).
9.Even W.R. Jr and Gregory D.P., MRS Bull. XIX(4), 29 (1994).
10.Grader G.S., de Hazan Y., Cohen Y., and Bravozhivotovskii D., J. Sol-Gel. Sci. Technol. 10, 5 (1997).
11.Grader G.S., de Hazan Y., Bravo-Zhivotovski D., and Shter G.E., J. Sol-Gel Sci. Technol. 10, 127 (1997).
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 2 *
Loading metrics...

Abstract views

Total abstract views: 34 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 22nd January 2018. This data will be updated every 24 hours.