催化石墨化对PAN基炭纤维结构的影响

Influence of Catalytic Graphitiaztion on Structure of PAN-based Carbon Fiber

研究了H3BO4或Fe(NO3)2.9H2O水溶液浸泡处理及石墨化处理温度对PAN基炭纤维石墨化度和微观结构的影响。XRD表明,催化石墨化效应随石墨化处理温度升高而降低。当热处理温度为2 400℃时,H3BO4处理使炭纤维石墨化度由5.9%提高到21.0%;当热处理温度为2 800℃时,H3BO4处理仅使炭纤维石墨化度由26.1%提高到27.9%。显微Raman光谱分析表明,催化处理促使炭纤维表层炭微晶结构的完整性和石墨化度显著提高,但对纤维芯部无效,炭纤维的催化石墨化效应仅限于纤维表层。

The catalytic graphitization of PAN-based carbon by soaking in water solution of H3BO4 or Fe （NO3 ）2·9H2O was studied to examine the influence of catalytic graphitization temperature on the graphitization degree and microstructure of the carbon fiber. XRD results showed that the catalytic graphitization effect decreased with the increase of graphitization temperature. At 2 400 ℃, H3BO4 made the graphitization degree of the fiber rise from 5.9% to 21.0%. At 2 800℃, from 26.1% to 27.9%. Micro Raman spectroscopy showed that catalysis remarkably improved the microstructure integrality and graphitization degree of the surface layer of the carbon fiber but had no effect on the core of the carbon fiber. It was concluded that the catalytic graphitization only happened to the surface layer of the carbon fiber.