Hostname: page-component-848d4c4894-8kt4b Total loading time: 0 Render date: 2024-06-24T19:00:28.446Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Silicon Exposure on Pyrolysis of Preceramic Polysilazane

Published online by Cambridge University Press:  25 February 2011

Helen N. Han ,
David A. Lindquist ,
John S. Haggerty  and
Dietmar Seyferth
Helen N. Han
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
David A. Lindquist
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
John S. Haggerty
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
Dietmar Seyferth
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
Get access

Abstract

Preceramic polysilazane was added to high purity Si powders as a reactive binder during synthesis of reaction bonded Si3N4 parts to improve the defect structures in both the unfired and nitrided parts. This study examined how the presence of Si powder affected the polymer-to-ceramic transformation of the polysilazane. Pyrolysis of both polysilazane and polysilazane+Si samples were characterized by TGA. Also, the gaseous volatiles evolved during pyrolysis were characterized by infrared and mass spectrometry. Results show that between 100- 550°C, silicon powder inhibits the loss of silazane oligomers from the polysilazane. However, for temperatures above 550°C, the weight loss differences between the pure polysilazane and the polysilazane+Si samples were less pronounced. Specific solvents used in the preparation of the polysilazane+Si mixtures affected the quantity and type of species in the volatiles during pyrolysis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 249: Symposium Q – Synthesis and Processing of Ceramics: Scientific Issues , 1991 , 391
Copyright
Copyright © Materials Research Society 1992

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

1. Lightfoot, A., Parikh, R.S., Haggerty, J.S., and Sheldon, B.W., submitted to J. Am. Cer. Soc.Google Scholar
2. Wiseman, G.H., PhD Thesis, Massachusetts Institute of Technology, 1984.Google Scholar
3. Seyferth, D., and Wiseman, G.H., J. Am. Ceram. Soc., 67 C–1 32 (1984).Google Scholar
4. Seyferth, D., and Wiseman, G.H., U.S. Patent 4 482 669, November, 1984.Google Scholar
5. Cannon, W.R., Danforth, S.C., Flint, J.H., Haggerty, J.S., and Marra, R.A., J. Am. Cer. Soc. 65 (7), 324–330 (1982).Google Scholar
6. Sheldon, B.W., ScD Thesis, Massachusetts Institute of Technology, 1989.Google Scholar
7. Sheldon, B.W., and Haggerty, J.S., Ceram. Eng. Sci. Proc. 10 (7-8), 784–793 (1989).Google Scholar
8. Han, H.N., SM Thesis, Massachusetts Institute of Technology, 1991.Google Scholar
9. Parikh, R.S., Lightfoot, A., Haggerty, J.S., and Sheldon, B.W., to be submitted to J. Am. Cer. Soc.Google Scholar