Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-25T17:36:38.417Z Has data issue: false hasContentIssue false
  • English
  • Français

Synthesis and Stabilization of Hexagonal Boron Nitride Materials

Published online by Cambridge University Press:  22 February 2011

Patrick David ,
Alain Mathiot ,
Jean-Daniel Lulewicz  and
Bruno Narcy
Patrick David
Affiliation:
Commissariat à L'Energie Atomique, BP 12, 91680 Bruyères le Châtel, FRANCE
Alain Mathiot
Affiliation:
Commissariat à L'Energie Atomique, BP 12, 91680 Bruyères le Châtel, FRANCE
Jean-Daniel Lulewicz
Affiliation:
Commissariat à L'Energie Atomique, BP 12, 91680 Bruyères le Châtel, FRANCE
Bruno Narcy
Affiliation:
Commissariat à L'Energie Atomique, BP 12, 91680 Bruyères le Châtel, FRANCE
Get access

Abstract

Boron nitride presents many interesting properties for high temperature applications: high specific modulus, high electrical resistivity, electromagnetic transparency and strong chemical stability. However synthesis and densification by liquid or gas phase reactions (CVD, CVI or plasma processes) required for high technology applications (thermal shield, protective coating, microwave windows) are difficult to bring into play because material characteristics are strongly dependent on elaboration conditions. Boron nitride ultrafine powder synthesized by gas phase reaction in RF plasma (using NH3 and BCh3 at 800-1400°C) and composites obtained using a rapid densification process (vapor phase infiltration using trichloroborazole compound as precursor) have been studied. In both cases post synthesis heat treatment had to be performed in order to get stabilization of the material, and to avoid its hydrolysis. The stability has been related to the physical characteristics of the material. Thermodynamical studies using Gibbs energy minimization calculations were helpful to determine synthesis and heat treatment conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 327: Symposium N – Covalent Ceramics II: Non-Oxides , 1993 , 233
Copyright
Copyright © Materials Research Society 1994

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

1. Plaine, R.T. and Narula, C.K., Chem. Rev., 90, 73, (1990)Google Scholar
2. Mueller, A., in Gmelin Handbuch der Anorganische Chemie, Boron Compounds, (Spiger-Verlag), 3rd Sup, 3, 1 (1988)Google Scholar
3. Kong, P.C. and Lau, Y.C., wure and Applied Chem., 62, 1809–1816, (1990)Google Scholar
4. Perrais, C., Synthesis of Boron by R.F. Plasma, Thesis, (1991)Google Scholar
5. Thermochemical Equilibria Calculation Code, Thermodata, 38402 St Martind'Hères FRANCEGoogle Scholar
6. Gebhardt, J.J., Proceedings of the 4th CVD Conference, 460–472, (1973)Google Scholar
7. Steele, S.R. and Al., Final Report, RDTR ECON 01343F, Raytheon Co., Whaltham, Mass.Google Scholar
8. Powell, C.F., Vapor Deposition, (John Wiley and Sons, New-York, 1966)Google Scholar
9. Pierson, H.O., J. of Composite Materials, 9, 228–240, (1975)Google Scholar
10. Coblenz, W.S., US Patent N°. 4 539 300 (3 Septembre 1985)Google Scholar
11. Houdayer, M., Spitz, J., Van, D. Tran, US Patent NO. 4472 454Google Scholar
12. Economy, J. and Lin, R., Boron and Refractor Borides, (Springer-Verlag, 1977)Google Scholar
13. Matsuda, T., J. of Mat. Sci., 24, 2353–2358 (1989)Google Scholar