Microstructure and phase evolution of ceramic precursors SiZrNOC synthesized via sol-gel method
Ceramic materials,as a kind of high strength,high hardness,abrasion resistance,and high-temperature resistance materials,have exhibited a broad prospect in the aerospace field.SiZrNOC pre-ceramic polymers were synthesized by sol-gel method using tetraethyl silicate as silicon source,diphenylmethane diisocyanate as nitrogen source,and zirconium n-propanol as zirconium source.The highest ceramic yield of 53%was achieved when the Zr/N ratio was 3∶1,as shown by the results of the weight loss rate test.Analysis of the ceramic microstructure by using scanning electron microscopy showed that the internal structure of the material became regular with increasing pyrolysis temperature,and densification was significantly enhanced.The ceramic materials designed can improve or extend their use in future aerospace-related applications.It provides a new option for developing materials with thermal stability and oxidation resistance at high temperatures.
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