PI/Ba(La,Ca)TiO_3复合吸波材料的制备及性能研究
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摘要
以耐高温聚酰亚胺(PI)树脂作为基体,La~(3+)/Ca~(2+)共掺杂的钛酸钡(Ba(La,Ca)Ti O_3)粉体作为吸波剂,采用热压法制备了PI/Ba(La,Ca)Ti O_3复合吸波材料。研究了Ba(La,Ca)Ti O_3粉体的晶相结构、复合材料的断面结构、弯曲强度以及复合材料在低频波段的介电常数和吸波性能。结果表明:Ba(La,Ca)Ti O_3粉体晶相结构单一,晶粒发育良好,颗粒呈现类球形;复合材料介电常数的实部和虚部都随着Ba(La,Ca)Ti O_3用量的增加而提高,力学性能随着Ba(La,Ca)Ti O_3用量的增加先提高后降低;当Ba(La,Ca)Ti O_3用量为12%时,在350℃下PI/Ba(La,Ca)Ti O_3复合材料的吸波峰值为-14.7 dB(2.6 GHz),表明其具有优异的高温低频吸波性能。
A composite absorbing material based on high temperature resistant polyimide resin as matrix, and La~(3+)/Ca~(2+) co-doped barium titanate(Ba(La,Ca)TiO_3) powder as absorbing agent was prepared by hot pressing method. Crystal phase structure of Ba(La,Ca)TiO_3 powder, microstructure, mechanical properties, dielectric and low frequency absorbing properties of the composite were studied. The results show that Ba(La,Ca)TiO_3 powder has a single crystal phase structure, good grain development and spherical particle shape. Real and imaginary parts of the dielectric constant of composites increase with the increase of Ba(La,Ca)TiO_3 content. The mechanical properties of composite increase first and then decrease with the increase of Ba(La,Ca)TiO_3 content. Absorbing properties of polyimide/Ba(La,Ca)TiO_3 composite was tested at 350℃. The best high temperature low frequency absorbing effect occurred when the filling amount of Ba(La,Ca)TiO_3 is 12%, with absorption peak reaching-14.7 dB at 2.6 GHz.
A composite absorbing material based on high temperature resistant polyimide resin as matrix, and La~(3+)/Ca~(2+) co-doped barium titanate(Ba(La,Ca)TiO_3) powder as absorbing agent was prepared by hot pressing method. Crystal phase structure of Ba(La,Ca)TiO_3 powder, microstructure, mechanical properties, dielectric and low frequency absorbing properties of the composite were studied. The results show that Ba(La,Ca)TiO_3 powder has a single crystal phase structure, good grain development and spherical particle shape. Real and imaginary parts of the dielectric constant of composites increase with the increase of Ba(La,Ca)TiO_3 content. The mechanical properties of composite increase first and then decrease with the increase of Ba(La,Ca)TiO_3 content. Absorbing properties of polyimide/Ba(La,Ca)TiO_3 composite was tested at 350℃. The best high temperature low frequency absorbing effect occurred when the filling amount of Ba(La,Ca)TiO_3 is 12%, with absorption peak reaching-14.7 dB at 2.6 GHz.
引文
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[4]Buscaglia M T,Buscaglia V,Vivani M,et al.Influence of foreign ions on the crystal structure of BaTiO3[J].Journal of the European Ceramic Society,2000,20(12):1 997-2 007.
[5]X D Chen,G Q Wang,Y P Duan,et al.Microwave absorption properties of barium titanate/epoxide resin composites[J].Journal of Physics D:Applied Physics,2007,40(6):1 827-1 830.
[6]Morrison F D,Sinclair D C,West A R.Electrical and structural characteristics of lanthanum-doped barium titanate ceramics[J].Journal of Applied Physics,1999,86(11):6 355-6 366.
[7]Y Li,M S Cao,D W Wang,et al.High-efficiency and dynamic stable electromagnetic wave attenuation for La doped bismuth ferrite at elevated temperature and gigahertz frequency[J].RSC Advances,2015,5(94):77 184-77 191.
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[9]Liu S F,Abothu I R,Komarneni S.Barium titanate ceramics prepared from conventional and microwave hydrothermal powders[J].Materials Letters,1999,38(5):344-350.
[10]H T Liu,H F Cheng,J Wang,et al.Dielectric properties of the Si C fiber reinforced Si C matrix composites with the CVDSi C interphases[J].Journal of Alloys and Compounds,2010,491(1):248-251.
[11]T Zakri,J P Laurent,M Vauclin.Theoretical evidence for‘Lichtenecker's mixture formulae’based on the effective medium theory[J].Journal of Physics D:Applied Physics,1998,31(13):1 589-1 596.