Composite material based on an ablative phenolic resinudand carbon fibers

摘要

In this study, a technological procedure for the production of a moldingudcompound based on short carbon fibers and an ablative phenol–formaldehydeudresin for high temperature application was optimized. The starting rawudmaterials were characterized and molding compounds with different fiber/ud/matrix ratios and different fiber lengths were obtained. From the different laboratoryudsamples, molded parts were made by thermocompression. The basicudmechanical and thermal properties of the composites were determined. Fromudthe obtained results, the optimal fiber/matrix ratio was determined for a productionudof molding compound for high temperature application. The moldingudprocess of the composite material was optimized and all the parameters forudgood mechanical properties and high thermal stability of the composite wereudobtained. Optimization of the composite molding process was performed by theudapplication of a numerical method for a planned experiment, i.e., a full three-ud-factorial experimental design with variance of all three parameters (fiber length,udtemperature and time of the press cycle) on two levels. The obtained mechanicaludproperties (flexural strength: 247 MPa, modulus: 27.6 GPa, impact resistance:ud110 (for test moldings 10 mm10 mm) and 91 kJ/m2 (for test moldingsud15 mm15 mm)) justified the application of this composite material in theudautomotive, leisure, military and other industries where high temperature resistanceudand high mechanical strength is required.