Dielectric properties of spark plasma sintering AlN-W composite ceramics
来源期刊：Rare Metals2011年第6期
论文作者：WANG Jiangyuana,JIA Xiana,c,JIA Chengchanga,DONG Guixiab,ZHANG Yulia,and JIA Leia a School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing ,China b School of Materials Science and Engineering,Hebei United University,Tangshan ,China c Journals Publishing Center,University of Science and Technology Beijing,Beijing ,China
文章页码：633 - 638
摘 要：In order to develop AlN composites suitable for high average power electronic tube,AlN-W materials were prepared by spark plasma sintering.The effects of manufacture parameters on dielectric loss tangent and permittivity constant were investigated,which include powder-mixed method,milling time of high-energy ball milling,starting powder particle size,sintering temperature and holding time and adding amount of the conductive second phase.The results showed that AlN-W materials sintered at the temperature of 1700°C holding for 5 min with 10 vol.% W showed the best dielectric loss tangent larger than 0.81 at the frequency 1 kHz-1 MHz.In addition,magnetic stirring mixed powder and lower sintering temperature led to the better properties because of the higher porosity.The samples sintered from the starting AlN powder with smaller particle size also had the better properties.
WANG Jiangyuana,JIA Xiana,c,JIA Chengchanga,DONG Guixiab,ZHANG Yulia,and JIA Leia a School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China b School of Materials Science and Engineering,Hebei United University,Tangshan 063009,China c Journals Publishing Center,University of Science and Technology Beijing,Beijing 100083,China
摘 要：In order to develop AlN composites suitable for high average power electronic tube,AlN-W materials were prepared by spark plasma sintering.The effects of manufacture parameters on dielectric loss tangent and permittivity constant were investigated,which include powder-mixed method,milling time of high-energy ball milling,starting powder particle size,sintering temperature and holding time and adding amount of the conductive second phase.The results showed that AlN-W materials sintered at the temperature of 1700°C holding for 5 min with 10 vol.% W showed the best dielectric loss tangent larger than 0.81 at the frequency 1 kHz-1 MHz.In addition,magnetic stirring mixed powder and lower sintering temperature led to the better properties because of the higher porosity.The samples sintered from the starting AlN powder with smaller particle size also had the better properties.
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