Effect Of Zirconium Tungstate On The Thermal Expansion Properties Of Carbon Fiber Reinforced Polymer

Carbon fiber reinforced epoxy composite materials that are advanced structural materials have been widely developed and applied in aerospace and other modern high-tech fields. However, the matrix of CFRP exist large linear expansion coefficient, crisp and other shortcomings after curing, that makes the difference of thermal expansion coefficient is large between the matrix and the reinforcement, so that the composite dimensional stability is poor, but there are a lot of structures require a thermal stability in aviation and aerospace fields, because they are work in a wild temperature range.The micro-expansion performance of materials is important to enhance the thermal geometric stability of aerospace structures and electronic equipment. Preparing micro-expansion materials is more and more attention since found to the materials which is negative thermal expansion effects. The method is that adding a kind of materials which is negative thermal expansion effect in matrix to reduce the thermal expansion coefficient of the matrix in order to achieve micro-expansion. Zirconium tungstate (ZrW2O8) exhibits isotropic negative thermal expansion in the temperature range of 0.3 to 1050 K, and its negative thermal expansion coefficient is about to -8.7×10-6K-1. The micro-expansion composite materials have become a new topic which was made by the ZrW2O8 as the added phase and the thermal expansion composite materials.In this paper, using the high purity ZrW2O8 particles as filler modified TDE-85 epoxy resin. The linear expansion coefficients, impact strength, tensile strength, tensile fracture surface of ZrW2O8/TDE-85 composite materials are measured under different levels. The results showed that, with the increase of the ZrW2O8 content, the linear shrinkage and thermal expansion coefficient of casting body is falling. It is stabilized when the linear shrinkage and thermal expansion coefficient reduced to a certain value. Whenω(ZrW2O8):ω(TDE-85)=12:100, the linear shrinkage and thermal expansion coefficient of casting body tends to smooth, and its value decreased to 0.15% and 13.54×10-6℃-1. The linear shrinkage and thermal expansion coefficient of casting body were reduced by 89.51 percent and 63.13 percent, compared to the specimens of TDE-85 epoxy resin that is not added the zirconium tungstate particles. With the increase of the ZrW2O8 content, the bending strength and tensile strength of cast body increases gradually. It is start to decline after a certain value. Whenω(ZrW2O8):ω(TDE-85)=12:100, the bending strength and tensile strength of cast body is the maximum, and its value increased to 81.46MPa and 132.76MPa. the bending strength and tensile strength of cast body is increased by 31.28% and 22.54%, compared to the specimens of TDE-85 epoxy resin that is not added the zirconium tungstate particles. Observed the section of tensile specimens using SEM equi[ment, the test restlts shows that the tensile fracture of cast body is a ductile fracture characteristics.In this experiment, it is prepared CFRP composite materials using the resin solution that is the prepreg with the ratio ofω(ZrW2O8):ω(TDE-85)=12:100. The linear expansion coefficients, impact strength, tensile strength, tensile fracture surface of CFRP composite materials are measured. The results showed that: The thermal expansion coefficient of CFRP composite materials dropped to 2.57×10-7℃, the flexural strength and tensile strength of CFRP composite materials increased to 1687.06MPa and 2483.15MPa. The thermal expansion coefficient of CFRP composite materials is reduced by 10.13%, the bending strength of CFRP composite materials increased by 14.22%, the tensile strength of CFRP composite materials increased by 9.1%, compared to the specimens of of CFRP composite materials that is not added the zirconium tungstate particles.