摘要:
以异丙醇铝为原料, 经乙酰丙酮改性, 通过水解缩合制得Al2O3溶胶, 研究溶胶2凝胶法在碳纤维上涂覆氧化铝陶瓷和制备(涂层) 碳纤维增强铝基复合材料预制丝的连续工艺。采用了IR、TG-DTA、XRD、SEM 等手段对溶胶2凝胶产物、涂层纤维、碳纤维增强铝预制丝进行了分析表征。结果表明: γ-Al2O3涂层有效的阻止了氧分子渗入, 与原纤维相比, 涂层纤维的耐高温性能明显提高。涂层后纤维与熔融铝的润湿性和相容性明显改善, 涂层有效的阻止了碳/铝界面反应, 使预制丝强度明显提高。
Abstract:
Al2O3 sol gel was obtained by hydrolysis and polycondensation of chemically modified isopropoxyaluminum Al(OPr) 3 with acetylacetone (AcAcH), performed in the propanol solution with stoichiometric solution of isopropoxyaluninum, and then chemically converted by drying and pyrolysis to form γ-Al2O3 coating on carbon fibers. Further study focused on making the (coated) fiber reinforced aluminum composite prefabrication. The aluminum gel, the coated carbon fiber and the prefabrication were characterized by IR, TG DTA, XRD, SEM, etc . The results show that γ-Al2O3 coating prevents the harmful reaction between C/Al and penetration of oxygen molecule effectively. After the coating treatment, oxidation resistance of carbon fibers is enhanced, the moistability between the fibers and melting aluminum is greatly improved, and the tensile strength of C/Al prefabrication is heightened.
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