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By Joachim Bill, Fumihiro Wakai, Fritz Aldinger

The construction of high-purity ceramic fabrics from low-molecular weight, inorganic or organoelement precursors is a subject of accelerating relevance inside of fabrics technological know-how. With this rising know-how it truly is attainable to exactly tailor the homes of the ceramic fabric to permit new high-temperature or digital functions.

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Example text

Synthesis of boron-containing polysilazanes by the monomer and polymer route According to the monomer route these polymers are built up from monomeric Bcontaining units. The boron-containing monomers are synthesized by the hydroboration reaction of dichloromethylvinylsilane with borane dimethylsulfide. Ammonolysis of the obtained monomers yields boron-modified polysilazanes. If the synthesis occurs via the polymer route boron is introduced into a polymer which can be achieved by the hydroboration of polyvinylsilazanes.

2-3 with respect to the preparation of boron-containing polysilazanes [32, 171. I /B

According to this concept amorphous ceramics that exhibit unique high temperature properties can be obtained. The in-situ crystallization of these amorphous solids permits the preparation of nanocrystalline materials by a completely powder-free process. The structure and composition of the grain boundaries that originate from these crystallization processes strongly depend on the molecular structure of the initially used precursors. As a consequence, the precursor route can be applied for the architecture of grain boundaries.

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