微米磁性复合材料超声波吸收检测研究

目的研究磁性SiO2-Fe3O4-P(NIPAM-co-AA)有机-无机复合微球及复合材料的制备、吸收超声波的能力和吸波机理。方法分别对不同系列样品的超声衰减系数及声速进行测量、比对分析。结果磁性复合材料声衰减系数随SiO2的包覆厚度增大而增大,磁含量大小对声衰减系数有一定的影响,同时超声衰减系数对频率有很强的依赖性。结论复合材料中SiO2的包覆厚度、磁性大小对声衰减系数、超声速度有不同影响,此复合材料应用于超声波吸波材料时在较高频率对超声波的吸收效果好。

Detection of ultrasonic wave absorbing on micro-sized magnetic composite materials

Aim To study the preparing process of magnetic SiO2Fe3O4-P(NIPAM-co-AA) organic-inorganic composite microspheres,the character of composite materials absorbing ultrasonic wave and the mechanism of absorbing acoustic wave.Methods The ultrasonic attenuation coefficient and the ultrasonic speed of series of micro-sized composite materials have been detected,compared and analyzed.Results The ultrasonic attenuation coefficients of the composite materials are increased with the thickness of SiO2 coated on microspheres and magnetism content of composite materials affect the ultrasonic attenuation coefficient.Furthermore,the ultrasonic attenuation coefficient depends on frequency greatly.Conclusion The thickness of SiO2 coated on microspheres,magnetism content of composite materials have affected the ultrasonic attenuation coefficient and the ultrasonic speed in a different way.The composite materials show good performance at high frequency when they are used as materials of absorbing ultrasonic wave.