Catalytic Graphitization Of PF Resin Carbon And Its Application On C/C Composite

In this paper, the catalytic graphitization of the Phenol-formaldehyde(PF) resin-carbon with Boron, Chromium, Manganese, Iron, Cobalt and Nickel was studied respectively, and the effect of the catalytic graphitization on the PF resin is evaluated through X-ray diffraction, optical microscope, and laser Raman spectroscopy. Base on the results and the references, the catalytic mechanisms of every elements are got. At the same time, it is found that Iron can exhibit catalytic graphitization behavior at the low temperature and this case is analyzed. Base upon the work about the catalytic graphitization of PF resin-carbon, Boron, Chromium, and Iron are chose as the catalysts to fabricate the C/C composite. From the results of the resistivities, bending strength and the friction properties, the effect of the catalytic graphitization on the properties of the C/C composite is studied, and get a low-price way to manufacture the C/C composite.The results of the catalytic graphitization on the PF resin-carbon show that six different elements all have catalytic graphitization behaviors in different degree when the treatment temperature is above 1600℃. Boron can catalytic graphitized the PF resin-carbon as a whole and the effect of the graphitization advanced when the treatment temperature arise. The graphitization effect of metallic elements fluctuated at a high level when the treatment temperature arise. Iron can exhibite catalytic graphitization behavior at a low temperature. The state of the Iron can affect the beginning temperature of the graphitization, the beginning temperature of Ferrocene is 850℃and that of ferric chloride is 800℃.Base on the results of the catalytic graphitization, Boron, Chromium, and Iron are the optimal catalytic elements to fabricate the C/C composite. Compared to blank sample, the resistivities, bending strengths and the friction properties of the samples with catalysts are measured. The results show that the catalytic graphitization can elevate the resistivities of the C/C composite markedly. Under the condition of the same densities, the blank sample is 39.44μΩ·m but that of sample with Boron and that of sample with Iron are 16.82μΩ·m and 19.82μΩ·m severally. The resistivities of the sample with Chromium is 30.72μΩ·m but its density is low. Compare to the blank sample, the catalytic graphitization can reduce the bending strength of samples but enhance the toughness. These changes are related to the graphitization and the interface state between the fiber and the matrix. The catalytic graphitization also remarkably affect the friction properties of the composite. After the catalytic graphitization, the frictions of the samples with Boron and Iron are 0.27 and 0.28, but that of the blank sample is 0.71. The interface betweem the matrix and fiber can also affect the abrasion loss.The abrasion loss from the samples with Boron and blank sample are low, but that of the sample with Iron is large.