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Boron carbide (B4C) was selected as the additive for the modification of a phenol-formaldehyde (PF) resin, and the micro-structural evolution of the modified resin at high temperature was investigated. Results showed that the distribution of B4C particles became uniform at elevated temperatures. The primary oxidation of B4C started to occur at 450°C, and lots of B2O3 was formed above 650°C. By the...
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