以尿素、硼酸和热解炭(PyC)粉为原料,利用化学转化法,在1750℃、N2气氛下反应6h,制备了PyC/BN复合粉.采用XRD、XPS、SEM、DTA/TGA对PyC/BN复合粉的物相组成、化学成分、表面形貌及抗氧化性能进行了表征,并用矢量网络分析仪测试了PyC/BN复合粉在2～18 GHz频段内的吸波性能.结果表明:生成的h-BN颗粒在PyC粉表面形成包裹层,其尺寸为几十至几百纳米.相比于PyC粉,PyC/BN复合粉的抗氧化性能明显提高,在1200℃时其质量仍剩余50％以上,而PyC粉在940℃时已被氧化完全.同时,由于波阻抗增大,电子位移极化、界面极化、多重散射和λ /4干涉相消作用,使得PyC/BN复合粉在相同厚度下(d=2 mm),其反射率峰值达到-27.2 dB,反射率小于-10 dB的频宽为2.6 GHz;且随着厚度的增加,其反射率峰值均小于-10 dB,并出现多重吸收峰.PyC/BN复合粉可作为理想的轻质、耐高温、强吸收的吸波剂应用于微波领域.
参考文献
| [1] | Lin J C.Human and environmental protection from electromagnetic emissions.IEEE Microwave Mag.,2005,6(1):30-34. |
| [2] | Im Ji Sun,Kim Jong Gu,Lee Young Seak.Fluorination effects of carbon black additives for electrical properties and EMI shielding efficiency by improved dispersion and adhesion.Carbon,2009,47(11):2640-2647. |
| [3] | Singh Vivek K,Shukla Anuj,Patra Manoj K,et al.Microwave absorbing properties of a thermally reduced graphene oxide/nitrile butadiene rubber composite.Carbon,2012,50(6):2202-2208. |
| [4] | WANG Cben,KANG Fei-Yu,GU Jia-Lin.Synthesis and microwave absorbing properties of FeCoNi alloy particles/graphite flaky composites.Journal of Inorganic Materials,2010,25(4):406-410. |
| [5] | Cao Mao-Sheng,Song Wei-Li,Hou Zhi-Ling,et al.The effects of temperature and frequency on the dielectric properties,electromagnetic interference shielding and microwaveabsorption of short carbon fiber/silica composites.Carbon,2010,48(3):788-796. |
| [6] | XIE Wei,CHENG Hai-Feng,CHU Zeng-Yong,et al.Microwave absorbing properties of short hollow carbon fiber composites.Journal of Inorganic Materials,2008,23(3):481-485. |
| [7] | Al-Saleh Mohammed H,Sundararaj Uttandaraman.Electromagnetic interference shielding mechanisms of CNT/polymer composites.Carbon,2009,47(7):1738-1746. |
| [8] | ZHAO Dong-Lin; SHEN Zeng-Min.Preparation and microwave absorbing properties of microwave absorbing materials containing carbon nanotubes.Journal of Inorganic Materials,2005,20(3):608-612. |
| [9] | Wen G.,Wu G.L,Lei T Q,et al.Co-enhanced SiO2-BN ceramics for high-temperature dielectric applications.J.Eur.Ceram.Soc.,2000,20(12):1923-1928. |
| [10] | Zhang Wei-Ru,Wang Chong-Hai,Liu Jian,et al.Study on high properties and microwave-transmitting Si3N4-BN based ceramic composites.Bulletin of the Chinese Ceramic Society,2003(3):3-6. |
| [11] | Cofer Cameron G.,Economy James.Oxidative and hydrolytic stability of boron nitride-a new approach to improving the oxidation resistance of carbonaceous structures.Carbon,1995,33(4):389-395. |
| [12] | Che R C,Peng L M,Duan X F,et al.Microwave absorption enhancement and complex permittivity an permeability of Fe encapsulated within carbon nanotubes.Adv.Mater.,2004,16(5):401-405. |
| [13] | Sumfleth Jan,Prehn Kirsten,Wichmann Malte H G,et al.Acomparative study of the electrical and mechanical properties of epoxy nanocomposites reinforced by CVD and arc-grown multi-wall carbon nanotubes.Compos.Sci.Technol.,2010,70(1):173-180. |
| [14] | Wang Xiangdong,Qiao Guanjun,Jin Zhihao.Preparation of SiC/BN nanocomposite powders by chemical processing.Mater.Lett.,2004,58(9):1419-1423. |
| [15] | Watanabe M O,Sasaki T,Itoh S,et al.Structural and electrical characterization of BC2N thin films.Thin Solid Films,1996,281-282:334-336. |
| [16] | Huang Fu Lin,Cao Chuan Bao,Xiang Xu,et al.Synthesis of hexagonal boron carbonitride phase by solvothermal method.Diamond Relat.Mater,2004,13(10):1757-1760. |
| [17] | Das M,Basu A K,Ghatak S,et al.Carbothermal synthesis of boron nitride coating on PAN carbon fiber.J.Eur.Ceram.Soc.,2009,29(10):2129-2134. |
| [18] | Bao Tianjiao,Zhao Yan,Su Xiaofeng,et al.A study of the electromagnetic properties of cobalt-multiwalled carbon nanotubes (Co-MWCNTs) composites.Mater.Sci.Eng.,B,2011,176(12):906-912. |
| [19] | Inui T,Konishi K,Oda K.Fabrications of broad-band RF-absorber composed of planar hexagonal ferrites.IEEE Trans.Magn.,1999,35(5):3148-3150. |
| [20] | Cao Maosheng,Zhu Jing,Yuan Jie,et al.Computation design and performance prediction towards a multi-layer microwave absorber.Mater.Des.,2002,23(6):557-564. |
| [21] | Vinoy K J,Jha R M.Radar Absorbing Materials:From Theory to Design and Characterization.Dordrecht,The Netherlands:Kluwer Academic Publishers,1996. |
| [22] | Ramo S,Whinnery J R,Van Duzer T.Fields and Waves in Communication Electronics,3rd ed.New York:John Wiley and Sons,1994. |
| [23] | Chen Y J,Cao M S,Wang T H,et al.Microwave absorption properties of the ZnO nanowire-polyester composites.Appl.Phys.Lett.,2004,84(17):3367-3369. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%