【摘 要】
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In order to develop AlN composites suitable for high average power electronic tube,A1N-W materials were prepared by spark plasma sintering.The effects of manufa
【机 构】
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School of Materials Science and Engineering,Journals Publishing Center
论文部分内容阅读
In order to develop AlN composites suitable for high average power electronic tube,A1N-W materials were prepared by spark plasma sintering.The effects of manufacture parameters on dielectaic 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℃ 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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