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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

  • N.V. Ravi Kumar (a1), André Zimmermann and Fritz Aldinger (a1)

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.

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References

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1. Christ, Martin, Thurn, Günther, Weinmann, Markus, Bill, Joachim, and Aldinger, Fritz, Journal of American Ceramic Society., 83 [12] 3025– 32 (2000).
2. Riedel, Ralf, Kienzle, Andreas, Dressler, Wolfgang, Ruwisch, Lutz, Bill, Joachim and Aldinger, Fritz, Nature, Vol.382 (1996).
3. Precursor-Derived Ceramics, Systhesis, Structure and High Temperature Mechanical Properties, Edited by: Bill, J., Wakai, F., and Aldinger, F., Wiley-VCH.
4. Aldinger, Fritz, Prinz, Sabine, Janakiraman, Narayanan, Kumar, Ravi, Christ, Martin, Weinmann, Markus, and Zimmermann, André, “International Journal of Self-Propagating High-Temperature Synthesis 10 [3] 249263 (2001).
5. Wan, Julin and Mukherjee, Amiya, Journal of Metals., pp.2833, January (2003).

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