低熔点金属Fe对AlN-Mo复合陶瓷性能的影响  

Effect of Low Melting Point Iron on Properties of AlN-Mo Composite Ceramics

作　　者：马会娜[1] 杨志民[1] 杜军[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《材料导报》2013年第8期8-10,共3页Materials Reports

摘　　要：以氮化铝粉、钼粉为原料,采用放电等离子烧结(SPS)技术制备了AlN-18%Mo复合陶瓷。采用X射线衍射(X-ray diffraction,XRD)仪、扫描电镜(Scanning electron microscope,SEM)、介电频谱(Dielectric frequencyspectrum)分析研究了低熔点金属Fe对复合陶瓷导电性能及介电性能的影响。结果表明,随着低熔点金属Fe含量的增加,复合陶瓷的渗流转变温度逐渐降低,添加1%(体积分数)Fe,AlN-18%(体积分数)Mo复合陶瓷的渗流转变温度降低了90℃;随着低熔点金属Fe含量的增加,AM18复合陶瓷的介电常数、损耗逐渐增加,并从复合材料的显微结构及介电理论方面对以上结果给予解释。The A1N-18%Mo composite ceramics were produced by spark plasma sintering （SPS） with A1N and Mo powders. The effect of low melting point iron on electric conduction and dielectric properties of the composite ce- ramics were studied by X-ray diffraction （XRD）, scanning electron microscope （SEM）, dielectric frequency spectrum. The results indicate that the addition of iron, which has low melting point, can decrease percolation transition tempe- rature. With lvo1% Fe content, the percolation transition temperature of A1N-18vol%Mo composite ceramics de- creased by 90 ℃. With the continued increasing the cotent of low melting point iron, the dielectric constant and loss of the composite ceramics were increased, the above results were explained by the microstructure of composite materials and the dielectric theory.

关 键 词：氮化铝 放电等离子烧结 介电性能 导电性能 

分 类 号：TQ174[化学工程—陶瓷工业]