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用反应烧结工艺在1 550℃制备了碳纳米管(carbon nanotubes,CNTs)/Si3N4陶瓷基复合材料,借助X射线衍射、扫描电镜、透射电镜、标量分析等分析手段,研究了反应烧结CNTs/Si3N4复合材料的物相组成、化学相容性、力学性能及电磁性能。结果表明:反应烧结CNTs/Si3N4复合材料主要由αSi3N4和βSi3N4组成,还含有少量的游离硅。CNTs和Si3N4基体之间具有良好的化学相容性。含有1.0%(质量分数)CNTs的反应烧结CNTs/Si3N4复合材料的抗弯强度为280 MPa,Vickers硬度为8.2 GPa,断裂韧性为2.3 MPa.m1/2,在8~12 GHz(X带)具有明显的微波衰减特性,在10 GHz处的最大衰减值达7 dB,可用作微波吸收材料。
Abstract：Carbon nanotubes(CNTs)/Si_3N4 ceramic matrix composites were prepared at 1 550 ℃ by reaction-bonded process.The phase compositions,chemical compatibility,mechanical properties,and electromagnetic properties of the composites were investigated by X-ray diffraction,scanning electron microscope,transmission electron microscope,and a scalar measurement system.The results show that the composites consist mainly of αSi_3N4 and βSi_3N4 with a trace of unreacted silicon.There is good chemical compatibility between the CNTs and the Si_3N4 matrix.The composite with 1.0 %(in mass) CNTs has a bending strength of 280 MPa,Vickers hardness of 8.2 GPa,and fracture toughness of 2.3 MPa·m1/2.The composite displays microwave attenuation at 8—12 GHz(generally called the X-band).The peak value of the transmission attenuation reaches 7 dB at 10 GHz,indicating that the composites have a potential application in electromagnetic adsorption.
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基本信息:
中图分类号:TQ174.6
引用信息:
[1]刘学建,黄智勇,向长淑,等.反应烧结工艺制备碳纳米管/氮化硅陶瓷基复合材料[J].硅酸盐学报,2006(02):133-136.
基金信息:
国家自然科学基金(50220160657);; 上海市纳米专项资金(0352nm053);; 上海市重大项目(04DZ14002)资助项目
2006-02-28
2006-02-28