Title

Polymer-ceramic conversion of liquid polyaluminasilazanes for SiAlCN ceramics

Authors

Authors

A. Dhamne; W. X. Xu; B. G. Fookes; Y. Fan; L. G. Zhang; S. Burton; J. Z. Hu; J. Ford;L. A. An

Comments

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Abbreviated Journal Title

J. Am. Ceram. Soc.

Keywords

SILICON-CARBIDE; HIGH-TEMPERATURE; CARBONITRIDE; PRECURSOR; ALUMINUM; MEMS; FABRICATION; COMPOSITES; PYROLYSIS; VISCOSITY; Materials Science, Ceramics

Abstract

Liquid-phased polyaluminasilazanes were synthesized by simply reacting a liquid polyureasilazane with aluminum isopropoxide. The reaction was studied by Fourier-transform infrared spectrometry (FTIR) and mass spectroscopy. The resultant polyaluminasilazanes were then pyrolysized to form amorphous SiAlCN ceramics at 1000 degrees C in flowing N-2. The structural evolution during pyrolysis was studied using solid-state NMR and FTIR. Spectral analysis revealed that the amorphous structures of the ceramics consisted Of SiC2N2 and SiCN3 as major building units, small amounts Of SiC3N and SiN4 units, and penta- or hexa-coordinated aluminum with nitrogen. Such units were connected with each other through C-C/C = C bonds or by shearing N to form network structures. The results also revealed that the relative amount of these units strongly depended on the Al content.

Journal Title

Journal of the American Ceramic Society

Volume

88

Issue/Number

9

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

2415

Last Page

2419

WOS Identifier

WOS:000231634800013

ISSN

0002-7820

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