碳/铝复合材料的热膨胀性能

采用标准接触式热膨胀仪对纤维单向增强的碳/铝复合材料的纵向和横向热膨胀系数进行了测定。试件是用碳/铝复合丝和铝箔(LD₂)交替辅层在低于金属熔点50℃条件下热压而成。纤维的体积含量分别为0、0.27、0.32、0.34、0.39、0.46。测定的温度范围是从室温到400℃。结果表明,碳/铝复合材料的热膨胀系数同纤维的种类、纤维的体积含量以及测定的温度范围有关。测定的结果同计算值作比较,结果表明碳/铝复合材料的热膨胀系数可以用混合规则的修正表达式来描述。 

THERMAL EXPANSION OF CARBON-FIBER ALUMINIUM COMPOSITES

In this investigation the thermal expansion measurments were made on carbon-fiber aluminium unidirectional composites by a standard contact-type dilaometer,The specimens are prepared by laying precursor carbon-Al wires and aluminium alloy foil (LD2) alternately in a sandwich form and consolidating by hot-pressing at 50℃ below the matrix solidua temperature.These romposites contained fiber volume fractions of 0,27,32,34,39 and 46 percent.The thermal expansion measrurements were made at 0 and 90 centigrade degree to the fiber axis in the temperature range from room temperature(RT) to 400℃.The results showed that the thermal expansion coefficients (CTE) of carbon fiberaluminium composites are related to fiber variety,fiber volume fraction and measuring temperature range.Experimental mean values of the axial linear CTE were compared with calculated valuese,which showed that it could he described by a modification of the rule of the rule of mixtures expansion of composite.