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Antioxidant modification of carbon/carbon (C/C) composites by  in situ  hydrothermally synthesized 4ZnO·B 2 O 3 ·H 2 O was successfully achieved. Samples were characterized by X-ray diffraction, scanning electron microscopy, isothermal oxidation test and thermogravimetry/differential scanning calorimetry. The influence of hydrothermal temperature on the phase composition and microstructure of as-prepared 4ZnO·B 2 O 3 ·H 2 O, and the antioxidant modification of C/C composites were investigated. Results showed that 4ZnO·B 2 O 3 ·H 2 O crystallite coating was achieved on the surface of C/C composites at the hydrothermal temperature range of 100–180°C. A smooth and crack-free 4ZnO·B 2 O 3 ·H 2 O layer was obtained when the hydrothermal temperature reached 140°C. The isothermal oxidation test showed that the oxidation resistance of C/C composites was improved. The as-modified composites exhibited a weight loss of only 1.93 g/cm 3  after oxidation at 600°C for 15 h, while the non-modified one had a weight loss of 5.20 g/cm 3  after only 10 h of oxidation.

Antioxidant modification of C/C composites by in situ hydrothermally synthesized 4ZnO·B 2 O 3 ·H 2 O