Research and Development on Novel Polymer Preceramic Precursors

Reference Presenter Authors
18-019 Tong Zhao Zhao, T.(Institute of Chemistry, Chinese Academy of Sciences); Qiu, W.(Institute of Chemistry, Chinese Academy of Sciences); Han, W.(Institute of Chemistry, Chinese Academy of Sciences); Lu, Y.(Institute of Chemistry, Chinese Academy of Sciences); Recent research and development on novel polymer preceramic precursors were overviewed, which included UHTC-CMC precursors related to ZrC, ZrC-SiC and Ta4HfC5, SiBN and SiBCN precursors aimed at wave-transmitting materials and metal oxide precursors dedicated to alumina fibers. Polyzirconoxane (PNZ) was synthesized by controlled hydrolysis of acetyl acetone coordinated zirconium alkoxide. ZrC precursor was generated from blending PNZ with Allyl novolac (AN) as carbon source then. ZrC-SiC precursor can be formed by blending ZrC precursors with PCS. For applications at even higher temperatures, Ta4HfC5 precursor was prepared via cohydrolysis of acetyl acetone coordinated tantalum alkoxide and hafnium alkoxide followed by blending with AN as carbon source. SiBCN and SiBN precursors were also introduced in terms of applications of polymer-derived ceramics in the field of wave-transmitting. Based on the processing flexibility of polymer precursors, alumina fiber was fabricated by melting spinning and pyrolysis of alumina precursors. It was stated that the production of all the precursors above was in pilot scale or even larger due to the synthesis controllability and processing stability and that applications of them have already penetrated into the industry in China.
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