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

Öz

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.

Anahtar Kelimeler

• 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

Öz

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.

Anahtar Kelimeler

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

Kaynakça

1. . Lav Varshney. Technical Report Radar Principles, October 29, 2002 Revision No. 3 Syracuse Research Corporation NY. 13212-2509. (2002).
2. . Varshney, L. Radar Principles Syracuse Research Corporation. Revision No. 3. NY(2002).
3. . Radar Navigation and maneuvering board manual. Chapter 1. Basic radar principles and general characteristics. ProStar Publications. NTM 38/08. Seventh Edition 2001.
4. . Trujillo A.P. & Thurman, H.V. The Black Arts: Materials and Process Selection and Stealth Technology. Essentials of Oceanography. (2004).
5. . Tzu-Hao Ting, Kuo-Hui Wu, Jen-Sung Hsu, Ming-Ho Chuang, Cheng-Chien Yang. Microwave Absorption and Infrared Stealth Characteristics of Bamboo Charcoal/Silver Composites Prepared by Chemical Reduction Method. Journal of the Chinese Chemical Society. 55, 724-731(2008).
6. . J. Zhou, H. Ma, M. Zhong, G. Xu, Z. Yue, Z. He Jour. Mag. and Mag. Mat. 305, 467-469 (2006)
7. . Saville, P. Review of Radar Absorbing Materials. Defence R&D Canada – Atlantic. (2005).
8. . Diaz, R. Fundamentals of Electromagnetic waves. Arizona State University, ARC Technologies, Inc (2012).

9. . Vinoy, K. J.; Jha, R. M. Radar Absorbing Materials: From theory to Design and Characterization; Kluwer Academic Publishers: Boston (1996).
10. . Knott, E. F.; Shaeffer, J. F.; Tuley, M. T. Radar Cross Section, 2Rev. ed ed.; Artech House: Norwood. (1993).
11. . Machinerieen, N. V., FR Patent 802728. (1936).
12. . RF Products. Introduction to microvawe absorber. Retrieved 15.08.2012 from www.lalrdtech.com. (2004)
13. . Kojima, H. Ferromagnetic Materials: A Handbook on the Properties of Magnetically Ordered Substances, in: E.P. Wohlfarth (Ed.), vol. 3, ch 5. North Holland, Amsterdam. (1982)
14. . Yılmaz Atay H., Çelik E. Barium Hexaferrite Reinforced Polymeric Dye Composite Coatings for Radar Absorbing Applications, Polymer Composites. Volume 35, Issue 3, pages 602–610. (2014).
15. . Aksit, A., Onar, N., Ebeoglugil, M.F., Birlik, I., Celik, E., & Ozdemir, I. Electromagnetic and Electrical Properties of Coated Cotton Fabric with Barium Ferrite Doped Polyaniline Film, Journal of Applied Polymer Science, Vol. 113(1), 358-366 (2009).
16. . Yuanxun Li, Huaiwu Zhang, Yingli Liu, Qiye Wen. Synthesis and Electro-magnetic Properties of Polyaniline-barium Ferrite Nanocomposite. Chin. J. Chem. Phys. 20 739 (2007)
17. . Praveen Singh, V.K. Babbar Archana Razdan S.L. Srivastava R.K. Puri Complex permeability and permittivity, and microwaveabsorption studies of Ca(CoTi)xFe12−2xO19 hexaferrite composites in X-band microwave frequencies. . Materials Science and Engineering: B. Volume 67, Issue 3, Pages 132–138. 15 December (1999).
18. . A. Mali, A. Ataie. Influence of the metal nitrates to citric acid molar ratio on the combustion process and phase constitution of barium hexaferrite particles prepared by sol–gel combustion method. Ceramics International 30, 1979–1983 (2004).
19. . M. Mozaffari, M.Taheri, J.Amighian. Preparation of barium hexaferrite nanopowders by the sol–gel method, using goethite. Journal of Magnetism and Magnetic Materials 321, 1285–1289 (2009).
20. . Yuanxun Li, Huaiwu Zhang, Yingli Liu, Qiye Wen and Jie Li. Rod-shaped polyaniline–barium ferrite nanocomposite: preparation, characterization and properties. Nanotechnology 19, 105-605 (2008)
21. . Yılmaz Atay H., Yaşa I.& Çelik E. Antibacterial polymer composite coatings with synthesized silver nanoparticles. Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry. Volume 45, Issue 6, 2015. DOI:10.1080/15533174.2013.843561. (2014).
22. . Pradhan, K. C.; Nayak, P L. Synthesis and characterization of polyurethane nanocomposite from castor oil-hexamethylene diisocyanate (HMDI). Adv. Appl. Sci. Res. 3, 3045–3052 (2012).
23. . Li, B.; Liu, X.; Cao, C.; Meng, F.; Dong, Y.; Cui, T.; Ding, C. Preparation and antibacterial effect of plasma sprayed wollastonite coatings loading silver. Appl. Surf. Sci. 2008, 255, 452–454. (2008).
24. . P. Singh, V.K. Babbar, A. Razdan, S.L. Srivastava, and R.K. Puri, Mater. Sci. Eng.: B., 67 (3), 132 (1999).
25. . Yılmaz Atay H., Çelik E. Multifunctional polymer composites; Antibacterial, flame retardant, radar absorbing and self-healing. The Journal of Composite Materials. August 27, 2014, doi: 10.1177/0021998314549613. (2014).