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Studies on SiBN(C)-ceramics: Oxidation- and CrystallizationBehavior Lead the Way to Applications

Published online by Cambridge University Press:  21 February 2011

H.-P. Baldus  and
G. Passing
H.-P. Baldus
Affiliation:
Bayer AG, ZF-MFA, D-51368 Leverkusen, Germany
G. Passing
Affiliation:
Bayer AG, ZF-MFA, D-51368 Leverkusen, Germany
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Abstract

The thermal stability of amorphous borosilicon nitride (Si3B3N7) and borosilicon carbonitride (SiBN3C) between 1000°C and 2000oC both in air andunder inert conditions is reported. Both materials are derived frompolymerization and subsequent pyrolysis of a “single source” precursor. Onheating in vacuum or nitrogen SiBN3C remains amorphous up to lCWCwhereas Si3B3N7 crystallizes at about1800°C under these conditions. At about 2000^ the SiBN(C)-materialsdecompose into SiC, BN, B4C and N2.

Oxidation studies performed by TEM- and SEM-investigations of oxidizedborosilicon carbonitride grains reveal that an interlayer consisting of B,N, and only little O is formed between the oxide scale on the surface andthe inner bulk material. The interlayer does not disappear at temperaturesabove 1450°C in contrast to the Si2N20-interiayerobserved on oxidized silicon nitride. The oxidation kinetics of the newceramics are established in the range from 1000°C to 1600°C indicating avery high oxidation resistance. Possible applications as matrix materials aswell as materials for fibers and coatings are discussed.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 617
Copyright
Copyright © Materials Research Society 1998

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References

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