Pyrolysis Behaviour of Boron Phenolic Resin-Based Ceramicable Composites by Introducing of MgO-Al2O3-SiO2

Ceramifying composites based on boron phenolic resin (BPF) were prepared with the modification additives of nanoMgO-Al₂O₃-SiO₂ (MAS). The effects of fillers on the thermal stability of BPF-based composites were investigated. MAS inorganic fillers could enhance the heat-resistance with a high residue yield and a near-net shape at elevated temperature. The effect of elevated temperature on microstructure and phase composition of composites was also characterized by scanning electron microscope (SEM) and X-ray diffraction analyses (XRD) when samples were heated at 600°C, 800°C, 1000°C and 1200°C respectively. SEM showed the presence of the skin and compact ceramic structure formation, more pronounced at higher temperature. XRD patterns manifested that the formation of new phases (main glass phase) in 1200°C stemmed mainly from the reaction between the porous activated carbon from the decomposed resin matrix and MAS fillers.