掺合材对水泥基材料雷达吸波效能实验研究

Experiment on the radar stealth effect of blended materials for cement based materials

采用弓形法,对以水泥为基体,以掺合材硅灰和粉煤灰、石墨和碳纤维、纳米TiO2和钢纤维为吸波剂的试样,在8～18GHz频段内的吸波性能进行了分析,实验表明硅灰和粉煤灰、纳米TiO2和钢纤维与水泥复合制成的吸波材料具有良好的吸波效能,在8～18GHz频段内,其吸波效能随掺合材的含量增加而增大,但有一极限值。石墨和碳纤维与水泥复合制成的吸波材料的吸波效能较差,当石墨和碳纤维掺量为6%(质量分数)以上时,材料的吸波性能下降。硅灰和粉煤灰混合的最佳含量为30%(质量分数)左右,而纳米TiO2和钢纤维的最佳含量为纳米TiO24%(体积分数)、钢纤维4%(质量分数)左右。掺合材超过一定极限后,材料的透波能力增强,吸波性能便会下降。

With cement as matrix,silica fume and culver zed fuel ash,graphite and carbon fibers,nano-TiO2 and steel fibers as sampled absorbing agents,experiments to analyze their absorbing performance are conducted,applying arch method.Experimental results indicate that the previous three composite materials blended with cement all show preferable absorbing performance within 8-18GHz frequency band.Absorbing performance improves generally with increasing proportion of blended absorbing agents,though restricted by a peak value.Cement blended with graphite and carbon fiber demonstrates rather inferior performance.Its peak value comes when fraction of the composite is 6wt%,above which the composite＇s absorbing performance declines.For the rest,peak value is generated when the fraction of silica fume and culver zed fly ash is 30wt%,that of nano-TiO2 and steel fiber is 4vol% and 4wt% respectively.When absorbing agents exceed a certain threshold corresponding to the peak value,the composite＇s wave-penetrating property will enhance,while its absorbing performance will be reduced.