Doped silicon carbonitride: Synthesis, characterization and properties
- Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany). Pulvermetallurgisches Laboratorium
- TH Darmstadt (Germany). Fachbereich Materialwissenschaft
The authors 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{prime}){sub x}) with M = B or P and subsequent pyrolysis in argon atmosphere at 1,000 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 pyrolyzed to the appropriate monolith. The obtained material is amorphous to X-ray-diffraction. Investigations by electron spectroscopic 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 temperatures in a nitrogen atmosphere crystallization of the appropriate thermodynamically stable phases occurs around 1,400 C yielding a micro/nano-, nano/nano- or micro/microcrystalline microstructure with design-tailored properties depending on the element M.
- OSTI ID:
- 51619
- Report Number(s):
- CONF-940411--; ISBN 1-55899-246-4
- Country of Publication:
- United States
- Language:
- English
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Process for producing ceramic nitrides and carbonitrides and their precursors
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Related Subjects
AMORPHOUS STATE
BORON COMPOUNDS
CARBONITRIDES
CHEMICAL COMPOSITION
COMPOSITE MATERIALS
CRYSTALLIZATION
FABRICATION
FLOWSHEETS
MICROSTRUCTURE
NITROGEN
ORGANOMETALLIC COMPOUNDS
PHOSPHORUS ADDITIONS
POLYMERS
PYROLYSIS
SILICON COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION