碳纤维增强石膏的力学性能及其制备方法

Study on Preparation Methods and Mechanical Properties of Carbon-fiber Reinforced Gypsum

以磷酸溶液作为电解质,通过阳极氧化法对碳纤维表面进行改性,并将改性碳纤维与石膏共混来制备新型的石膏复合材料,研究碳纤维掺量,碳纤维的表面改性及对复合材料性能的影响,利用SEM、XPS等测试手段对改性碳纤维和复合材料进行表征。通过扫描电镜观察氧化后的碳纤维表面结构和碳纤维复合材料的微观形貌可以看出改性后的碳纤维表面变得粗糙,增大比表面积,有利于碳纤维与石膏复合。同时通过XPS可以得出碳纤维表面的含氧基团增多,改变了碳纤维的亲水性,有利于碳纤维在石膏中均匀分散。并通过抗压抗折测试研究碳纤维石膏复合材料的力学性能。

This paper focus on the preparation of a new type of composite material which blended the gypsum with the surface-modified carbon fiber using the phosphoric acid solution as the electrolyte and the method of anodic oxidation process. The effect of the doping amount of carbon fiber and modification of the surface of carbon fiber on the properties of composite materials was researched. The modified carbon fibers and their composites were characterized by SEM and XPS. After the oxidation, the surface structure of carbon fibers and the microstructure of carbon fiber composites can be seen through SEM. The modified carbon fibers had rough surface, increased specific surface area which was beneficial to mixing with the gypsum. At the same time, the oxygen-containing groups on the surface of the carbon fiber can be found increasing by XPS which changes the hydrophilicity of carbon fiber and was advantageous to the carbon fiber evenly dispersing in the plaster. Through the compressive flexural tests, mechanical properties of carbon fiber were studied.