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Creep Behaviour of a Crystallized Si-B-C-N Ceramic Obtained from the Polymeric Precursor T2-1(B[C2H4Si(CH3)NH]3)n

Published online by Cambridge University Press:  10 February 2011

N.V. Ravi Kumar ,
André Zimmermann  and
Fritz Aldinger
N.V. Ravi Kumar
Affiliation:
Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, Universität Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstr. 3, D-70569, Stuttgart, Germany.
Fritz Aldinger
Affiliation:
Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, Universität Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstr. 3, D-70569, Stuttgart, Germany.
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Abstract

The boron modified poly(vinyl)silazane polymer precursor with the chemical composition (B[C2H4Si(CH3)NH]3)n was milled and sieved. The polymer particles from different size fractions were compacted using a graphite die in a uni-axial warm pressing machine at a pressure of 48 MPa and in the temperature range 250°C to 330°C. The green bodies were pyrolysed in an argon atmosphere at a temperature of 1300°C when the organic polymer converts into an inorganic amorphous Si-B-C-N ceramic. These amorphous ceramics were annealed under various conditions of temperature, nitrogen overpressure and holding time in order to crystallize them and to produce nano-crystalline microstructures. Compression creep experiments were carried out in atmospheric ambience at loads varying from 5 – 100 MPa and in the temperature range 1350°C – 1500°C to investigate the high temperature deformation behaviour of the crystalline material. The interest is to understand the mechanisms of deformation in these nanocrystalline Si-B-C-N ceramics at elevated temperatures and to compare the results with that of amorphous ceramics. The investigation also includes the determination of viscosity of the material at high temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 778: Symposium U – Mechanical Properties Derived from Nanostructuring Materials , 2003 , U1.6
Copyright
Copyright © Materials Research Society 2002

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References

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