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Chemical tailoring of Single-Source molecular and polymeric precursors for the preparation of ceramic fibers

S. BERNARD1,* , S. DUPERRIER1, D. CORNU1, P. MIELE1, M. WEINMANN2, C. BALAN3, F. ALDINGER2

Affiliation

  1. Laboratoire des Multimateriaux et Interfaces (UMR CNRS 5615)-Université Claude Bernard, 43, bd du 11 Novembre 1918-69622 Villeurbanne Cedex, France
  2. Max-Planck-Institut für Metallforschung, Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, 70569 Stuttgart, Germany
  3. "Politehnica" University Bucharest (PUB), Hydraulics Department, 313 Splaiul Independentei, RO-060032, Bucharest 16, Romania

Abstract

The present paper reports the preparation of non-oxide ceramic fibers through the Polymer-Derived Ceramics (PDCs) route. The poly[B-(methylamino)borazine]-derived boron nitride (BN) ceramic fibers and modified C-B-C-bridged polysilazanes-derived silicoboron carbonitride (SiBCN) ceramic fibers were used as models. The chemical tailoring of BN or SIBCN molecular and polymeric precursors, achieved by the introduction of plasticizing pendent groups such as Si-CH3 and NCH3/N(H)CH3 in the structure, has been shown to improve the melt-spinnability of preceramic polymers. Such pendent groups allowed of controlling both melt-viscoelastic properties and thermal reactivity, and then to produce high quality fine diameter endless green fibers via a stable melt-spinning process. Fibers were subsequently cured through a chemical process using ammonia as curing agent. As-cured fibers were then pyrolyzed in a controlled atmosphere depending on the desired ceramics. BN fibers were prepared by pyrolysis in an ammonia atmosphere at 1000 °C to remove the carbon elements from the materials, then in a nitrogen atmosphere at 1800 °C to microstructurally design the boron nitride phase and produce polycrystalline ceramic fibers. SiBCN fibers were obtained through pyrolysis of as-cured fibers at 1400 °C in a nitrogen atmosphere. Ceramic fibers are delivered in a controlled chemical composition with form retention..

Keywords

Non-oxide ceramic fibers, Polymer-Derived Ceramics.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

S. BERNARD, S. DUPERRIER, D. CORNU, P. MIELE, M. WEINMANN, C. BALAN, F. ALDINGER, Chemical tailoring of Single-Source molecular and polymeric precursors for the preparation of ceramic fibers, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 648-653 (2006)