采用整体预热燃烧合成法,以硅粉和炭黑为原料,铁粉为掺杂剂,聚四氟乙烯为助燃剂,在0.1MPa的氮气气氛中分别在不同预热温度下合成Fe掺杂β-SiC粉体。通过X射线衍射、扫描电子显微镜和电子能谱对合成粉体进行了微观表征。同时在8.2~12.4GHz频率范围内进行了介电性能测试,并对其吸波性能进行了计算。结果表明,随着预热温度的升高,合成的β-SiC粉体的晶格参数随之减小,其介电性能随之降低；当预热温度为1300℃,匹配厚度为2mm时,合成粉体的吸波性能在X波段达到最佳。
Fe-dopedβ-SiC powders have been synthesized by overall preheating combustion synthesis under dif-ferent preheating temperature,using silicon powders and carbon black as the raw materials,iron powder as dopant and PTFE as the chemical activator,respectively.The microstructure of prepared powders has been characterized by XRD,SEM and EDS.The electric permittivity of prepared powder has been determined and the microwave absorption property has been calculated in the frequency range from 8.2GHz to 12.4GHz.Re-sults show that the lattice constants and dielectric property of the preparedβ-SiC decrease with increasing pre-heating temperature.The SiC powder synthesized under preheating temperature of 1300℃ with 2mm matching thickness presents the best microwave absorption property in the X-band.
参考文献
| [1] | Krstic V D .Production of fine,high-purity beta silicon carbide powders[J].Journal of the American Ceramic Society,1992,75(01):170-175. |
| [2] | Fissel A;Schroter B;Richter W .Low temperature growth of SiC thin films on Si and 6 H-SiC by solid-source molecular beam epitaxy[J].Applied Physics Letters,1995,66(32):3182. |
| [3] | 李智敏,周万城,苏晓磊,罗发,黄云霞.Al掺杂对SiC粉体微波介电性能的影响[J].功能材料,2010(z2):331-333. |
| [4] | Huan J.;Zhou WC.;Fa L. .Synthesis and dielectric properties of nano Si/C/N powders[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2002(8):2459-2462. |
| [5] | Dan Li;Hai-Bo Jin;Mao-Sheng Cao .Production of Ni-Doped SiC Nanopowders and their Dielectric Properties[J].Journal of the American Ceramic Society,2011(5):1523-1527. |
| [6] | Seo WS.;Arai S.;Koumoto K. .Effects of boron, carbon, and iron content on the stacking fault formation during synthesis of beta-SiC particles in the system SiO2-C-H-2[J].Journal of the American Ceramic Society,1998(5):1255-1261. |
| [7] | Su Xiaolei;Jia Yan;Wang Junbo.Combustion syn-thesis and microwave absorption property of SiC(Fe)sol-id solution powder under different reaction time[J].Journal of Materials Science:Materials in Electronics,2012 |
| [8] | 苏晓磊,周万城,徐洁,李智敏,王俊勃,贺辛亥,付翀,张李峰.燃烧法合成Al掺杂β-SiC粉体的工艺参数对其介电性能的影响[J].功能材料,2011(04):737-740. |
| [9] | Luo Kong;Xiaowei Yin;Litong Zhang .Effect of Aluminum Doping on Microwave Absorption Properties of ZnO/ZrSiO_4 Composite Ceramics[J].Journal of the American Ceramic Society,2012(10):3158-3165. |
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