Microstructure and Properties of Resin-Based Pyrocarbon with Micro-Nano Structure Carbon and TiO<sub>2</sub> as Additives

Abstract

In the present study, novel pyrocarbon samples were prepared by carbonization with phenolic resin as precursor and such as graphite nanosheets, carbon black, and TiO2 with various ratios as additives. The microstructure, morphology, mechanical and anti-oxidation properties were investigated by X-ray diffraction, scanning electronic microscopy, electron universal testing machine, and oxidation weight loss method, respectively. The results show that the graphite nanosheets and carbon black can help to improve the mechanical properties and oxidation resistance of resin-based pyrocarbon because the structure of resin-based carbon will be effectively enhanced by these additives. TiO2 will be restored in the coking process which led to destroy of the internal structure of pyrocarbon, thus the addition of TiO2 will reduce the compressive strength and oxidation resistance of pyrocarbon. Mechanical property analysis indicate that the sample add graphite micro chip has the highest compressive strength of resin carbon, Numerical value for the sample is 17.3MPa, is 19 times of the sample which added graphite and boric acid, and 2 times of the sample which added TiO2,graphite and boric. Oxidation experiment under 500 °C results show that add boric acid against oxidation resistance of resin carbon materials, without boric acid resin carbon the burning loss rate is only 40% of the sample. Oxidation experiment under 500 °C results show that added boric acid, TiO2 and graphite sample of ignition loss rate is the lowest, the value of 71%, 25% lower compared to other samples.