【在线发表】[2016-1411]空心粉煤灰对铁氧体-炭黑/水泥基复合材料吸波性能的影响

对掺空心粉煤灰微珠的铁氧体-炭黑/水泥基复合材料吸波性能进行了研究。改变空心粉煤灰微珠、铁氧体、炭黑的配比，分析了影响混凝土电磁吸收效能的主要因素，并探讨了空心粉煤灰微珠、铁氧体和炭黑的加入对水泥基电磁吸收性能的影响机制。结果表明：8~18GHz频率范围内，空心粉煤灰微珠是影响吸波性能的最主要因素，最佳水平组合为20wt%铁氧体、20wt% 粉煤灰、10vol%炭黑，<-10dB吸收带宽可达10GHz且明显优于无粉煤灰样品，其机制在于空心粉煤灰微珠的掺入同时改善了材料表面透射性能和介电损耗。

关键词：粉煤灰；铁氧体；炭黑；水泥基；吸波

Abstract：Microwave absorbing properties of ferrite-carbon black/cement based composites doped with hollow fly ash were investigated. Various content ratios of the hollow fly ash, ferrite and carbon black were used to analyze the main effect factors and the influencing mechanisms on absorbing properties. The results indicate that hollow fly ash is the main effect factor on absorbing property. The best absorbing bandwidth < -10 dB was achieved by the specimen comprised of 20wt% ferrite, 20wt% hollow fly ash and 10vol% carbon black as exhibiting 10 GHz at region 8-18 GHz, which obviously better than none hollow fly ash samples. Improving material surface transmission performance and dielectric loss are the main effect mechanisms of fly ash.

Key words：fly ash; ferrite; carbon black; cement based; microwave absorbing