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Synthesis of Advanced Ceramics in the Systems Si-B-N and Si-B-N-C Employing Novel Precursor Compounds

Published online by Cambridge University Press:  25 February 2011

H.-P. Baldus ,
O. Wagner  and
M. Jansen
H.-P. Baldus
Affiliation:
Bayer AG, 5090 Leverkusen, FRG
O. Wagner
Affiliation:
Institut für Anorganische Chemie, Universität Bonn, 5300 Bonn, FRG
M. Jansen
Affiliation:
Institut für Anorganische Chemie, Universität Bonn, 5300 Bonn, FRG
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Abstract

The reaction of Cl3Si-NH-Si(CH3)3 with BCl3 yields the novel compounds Cl3Si-NH-BCl2 and (Cl3SiNH)2-BCl. The ammonolysis of these monomeric precursors in liquid ammonia gives rise to highly crosslinked borosilicon imides. Pyrolysis of the polymeric imides in a stream of ammonia at 1250°C yields amorphous borosilicon nitrides with formal compositions of Si3B3N7 and Si6B3Nu respectively. MAS-NMR, DTA/TG, SEM and TEM investigations reveal that the resulting materials are single phase.

The reaction of the novel precursors with primary amines yields meltable and soluble polymers suitable for producing fibers or coatings. Subsequent pyrolysis in NH3 leads also to amorphous borosilicon nitride. The physical and chemical properties of the new materials will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 821
Copyright
Copyright © Materials Research Society 1992

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References

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