摘要
将1%～10%(体积分数)碳掺杂氮化硼纳米管(carbon-doped boron nitride nanotubes,BCN-nt)引入到纳米AlN中,采用放电等离子烧结得到致密的AlN/BCN-nt复相陶瓷。结果表明:适当提高烧结温度能使AlN晶粒充分长大,提高AlN晶粒完整性并有效去除结构中的氧杂质,因而显著改善了引入BCN-nt对热导率的劣化。在Kα波段(26.5～40.0GHz),随BCN-nt含量的增加,材料的介电常数实部和虚部都呈现逐渐增大的趋势,损耗因子也逐渐增加。提高烧结温度对介电常数影响不大,而过高的温度使介电常数虚部明显下降。适当的BCN-nt含量和烧结温度能够在提供稳定的介电损耗同时兼顾较高的热导率。
Highly dense AlN/BCN-nt composites with 1%-10% （volume fraction） carbon-doped boron nitride nanotubes （BCN-nt） were fabricated by spark plasma sintering. The results indicate that even though the degradation with incorporation of BCN-nt into AlN,the thermal conductivity of sintered AlN/BCN-nt composites is evidently improved with the growth of AlN grains and the elimination of oxide contamination by increasing sintering temperature. Both the real part and imaginary part of the composites of Ka-Band （26.5-40.0 GHz） increase with the increase of BCN-nt content,in which the increase of imaginary part is more than that of real part,resulting in an increase of loss factor. Increasing sintering temperature does not have obvious impact on the dielectric constant value. However,excessively high sintering temperature （1 700 ℃ ） leads to damage of the tubular structure of BCN-nt and reduction of imaginary part of the composites. The AlN/BCN-nt composites with appropriate BCN-nt content and sintering temperature possess good dielectric dissipation and thermal conductivity.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第8期1440-1444,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(50602001)资助项目
关键词
氮化铝
放电等离子烧结
热导率
介电性能
aluminum nitride
spark plasma sintering
thermal conductivity
dielectric properties
