A COMPARISON ON RADAR ABSORBING PROPERTIES OF NANO AND MICRO-SCALE BARIUM HEXAFERRITE POWDERS REINFORCED POLYMERIC COMPOSITES

Abstract

It has been highlighted the usage of barium hexaferrite as a radar absorbing material in the polymer composites in our previous works. With this respect in this study, finer barium hexaferrite powders were obtained, and a comparison has been done on the radar absorbing properties by means of usage of micro and Nano-size powders reinforced composite coatings. Barium hexaferrite powders were synthesized by Sol-Gel method in Nano-size with the hexagonal molecular structure obtained powders were added to a polyurethane resin to interpolate radar absorbing property with different loading levels. Later on, metal substrates were coated with those polymeric composites. Besides characterization tests, such as particle size analysis, X-Ray Diffraction, Scanning Electron Microscopy (SEM), scratch test, radar absorbing test were performed with a Network Analyzer to indicate electromagnetic properties of barium hexaferrite reinforced composites. It was concluded that increasing barium hexaferrite powder amount in the composites increased radar absorbing performance. Additionally, by decreasing BaFe₁₂O₁₉ powder size to Nano scale, improved radar absorbing properties were obtained.

Keywords

• Radar absorbing materials,Barium hexaferrite,Nanotechnology,Polymer composites,Coatings

MIKRO VE NANO-BOYUTLU BARYUM HEKZAFERRIT TOZLARI ILE TAKVIYE EDILMIŞ POLIMER KOMPOZITLERIN RADAR ABZORBLAYICI ÖZELLIKLERI ÜZERINE BIR KARŞILAŞTIRMA

Abstract

Önceki çalışmalarımızda baryum hekzaferritin polimer kompozit  malzemelerde radar emici olarak kullanımı belirtilmiştir. Bu bağlamda bu çalışmada daha ince baryum hekzaferrit tozlar elde edilmiş, ve mikro ve nano-boyutlu tozlar ile takviye edilmiş kompozit kaplamaların radar emici özelliklerine dair bir karşılaştırma yapılmıştır. Baryum hekzaferrit tozları Sol-Gel yöntemi ile nano-boyutta ve altıgen bir moleküler yapıya sahip şekilde sentezlenmiş, elde edilen tozlar radar emici özelliği elde etmek için farklı oranlarda bir poliüretan reçinesine ilave edilmiştir.  Daha sonra metal altlıklar bu polimerik kompozitler ile kaplanmıştır. Boyut analizi, XRD, SEM, kazıma testi gibi karakterizasyon tekniklerinin yanında barium hekzaferrit ile güçlendirilmiş kompozitlerin elektromanyezit özelliğinin bir Netwotk-Analiz cihazı ile ölçümü gerçekleştirilmiştir. Kompozitlerde baryum hekzaferrit toz miktarının artırılmasıyla radar emici performansın da arttığı sonucuna varılmıştır. Ayrıca, BaFe₁₂O₁₉ partiküllerin boyutunun Nano seviyelerine indirilmesiyle daha iyi radar absorblayıcı özellik elde edilmiştir.

Keywords

• Radar abzaoblayan malzemeler,Baryum hekzaferrit,Nanoteknoloji,Polimer kompozitler,Kaplamalar

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