In this work, a new pathway to obtain high-carbon content ceramic for high-temperature applications was developed. Within this method, polyimide (PI) was used as the carbon source and polysilazane (ML33) as the preceramic polymer using different ratios (ML33/PI). The reactions were conducted in inert system and the resulting polymers were pyrolyzed in nitrogen at temperatures of up to 1500°C. TGA analyses showed that the weight loss of synthetized polymers was inferior to the pure compounds, which suggests an interaction between ML33 and PI during pyrolysis. XRD and RAMAN analyses revealed that the formed ceramic is predominantly composed of a SiCN amorphous matrix. According to XRD analyses the presence of carbon from PI prevented the crystallization during thermal treatment up to 1500°C, thus providing high thermal stability to the formed compound. Moreover, the samples displayed excellent oxidation resistance, which are attributed to the protection supplied by the carbon phase. Therefore, the results suggest that this new material is a promising alternative for high-temperature applications in oxidizing atmosphere.
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