Abstract
Ceramic-forming metallocarbosilanes {Ta(Zr)PCS and Ta(Hf)PCS} with a specified molar ratio of refractory metal atoms Ta/Zr (Ta/Hf) were synthesized by co-condensation of oligodimethylsilylenemethylenes and alkylamides of refractory metals (simultaneously Ta and Zr or Ta and Hf). The physicochemical properties of Ta(Zr)PCS and Ta(Hf)PCS were studied. It was determined that the metallocarbosilanes are soluble in hydrocarbon solvents and may possess fiber-forming properties. Polymer fibers based on Ta(Zr)PCS with a molar ratio Ta/Zr = 4 were prepared, then underwent curing and ceramization. The surface morphology and chemical composition of SiC fibers modified with mixed carbides Ta4ZrC5 after carbidization at 1250, 1500, and 1900 °C under argon were studied. The process of thermal transformation of metallocarbosilanes into ceramic phases at temperatures of 1250 and 1500 °C was investigated. It was shown that the synthesized metallocarbosilanes are precursors of SiC ceramics modified with mixed carbides TaxZryCz or TaxHfyCz and can be used to obtain components (fibers, matrices, protective coatings) of ceramic composite materials with an ultrafine homogeneous stabilized structure.
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The work was carried out with the financial support of the State Scientific Center of the Russian Federation JSC State Research Institute of Chemistry and Technology of Organoelement Compounds.
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Dedicated to Academician of the Russian Academy of Sciences M. P. Egorov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, Vol. 73, No. 2, pp. 421–436, February, 2024.
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Shcherbakova, G.I., Blokhina, M.K., Storozhenko, P.A. et al. Preceramic metallocarbosilanes: synthesis, properties, thermal transformation. Russ Chem Bull 73, 421–436 (2024). https://doi.org/10.1007/s11172-024-4149-2
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DOI: https://doi.org/10.1007/s11172-024-4149-2