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Doped Silicon Carbonitride: Synthesis, Characterization and Properties

Published online by Cambridge University Press:  21 February 2011

J. Bill ,
M. Friess ,
F. Aldinger  and
R. Riedel
J. Bill
Affiliation:
Max-Planck-lnstitut fur Metallforschung, Institut fur Werkstoffwissenschaft, Pulver-metallurgisches Laboratorium, Heisenbergstr. 5, D-70569 Stuttgart (Germany)
M. Friess
Affiliation:
Max-Planck-lnstitut fur Metallforschung, Institut fur Werkstoffwissenschaft, Pulver-metallurgisches Laboratorium, Heisenbergstr. 5, D-70569 Stuttgart (Germany)
F. Aldinger
Affiliation:
Max-Planck-lnstitut fur Metallforschung, Institut fur Werkstoffwissenschaft, Pulver-metallurgisches Laboratorium, Heisenbergstr. 5, D-70569 Stuttgart (Germany)
R. Riedel
Affiliation:
TH Darmstadt, Fachbereich Materialwissenschaft, Fachgebiet Disperse Feststoffe, Hilpertstr, 31 PTZ Gebàude D, D-64295 Darmstadt (Germany)
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Abstract

We report on an alternative route to quaternary ceramics which can be prepared by polycocondensation of commercially available polysilazanes with the appropriate alkyl amides (M(NRR')X with M = B or P and subsequent pyrolysis in argon atmosphere at 1000°C. Ceramic monoliths are obtained if the modified polysilazane is crosslinked at 400°C for 3 h. After ball-milling, sieving and cold isostatic pressing the green body is directly pyrolysed to the appropriate monolith. The obtained material is amorphous to X-ray-diffraction. Investigations by electron spectroscopie imaging (ESI) in TEM indicate a homogeneous distribution of the elements M, Si, C and N (M = B, P) within a resolution of 2 nm. Upon annealing at elevated tempertures in a nitrogen atmosphere crystallization of the appropriate thermodynamically stable phases occurs around 1400°C yielding a micro/nano-, nano/nano- or micro/microcrystalline microstructure with design-tailored properties depending on the element M.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 605
Copyright
Copyright © Materials Research Society 1998

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References

LITERATURE

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