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以糠酮树脂作粘结剂,添加树脂碳微粉、硼类催化剂、短切PAN基高强碳纤维,制得了含硼C/C复合材料。通过X射线衍射(XRD)、X射线光电子能谱(XPS)等手段,检测了硼、氧化硼在C/C中的状态,研究了它们对C/C复合材料的催化石墨化作用,分析了石墨化温度、催化剂种类及其用量对石墨化度的影响。结果表明,硼以固溶体的形式存在C/C复合材料,通过吸电子断键、代替碳原子消除缺陷等机理形式,使最难石墨化的玻璃碳和纤维碳达到了石墨化。在石墨化温度是2100℃、催化剂硼用量小于5.0wt%工艺条件下,玻璃碳基C/C的石墨化度达到了82%,而无催化剂的C/C在2500℃下石墨化度才达到71%。这表明硼在降低石墨化温度方面有明显作用。
With the furfural ketone resin as binder, resin carbon powder, boron catalyst and chopped PAN-based high-strength carbon fiber were added to prepare boron-containing C / C composites. The state of boron and boron oxide in C / C was investigated by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The catalytic graphitization of C / C composites was also studied. Effect of Graphitization Temperature, Catalyst Type and Amount on Graphitization Degree. The results show that boron exists in the form of solid solution with C / C composites, and the most difficult graphitized glassy carbon and fibrous carbon are graphitized by the mechanism of electron - withdrawing bond breaking and replacing carbon atoms to eliminate defects. The graphitization degree of glassy carbon based C / C reaches 82% under the condition of the graphitization temperature is 2100 ℃ and the amount of catalyst boron is less than 5.0wt%, while the graphitization degree of C / C without catalyst is 2500 ℃. Reached 71%. This shows that boron has a significant effect in lowering the graphitization temperature.