欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
添加10%（质量分数）BaO-SiO2-Y2O3烧结助剂在氮气氛下无压烧结制备SiC-AlN复相陶瓷。研究了SiC含量、烧结温度对复相陶瓷烧结性能、显微结构、热导率和高频介电性能的影响。结果表明：样品中主晶相为6H-SiC和AlN，次晶相为Y3Al5O12和Y4Al2O9；当SiC质量分数为50%时，1850℃烧结1h，显气孔率低于0.3%；而SiC含量继续增加，显气孔率显著上升。热导率、介电常数和介电损耗都随着烧结温度的升高而升高。当SiC质量分数为50%时，1900℃下复相材料呈现最好的热扩散系数和热导率，分别为26.3mm2·s–1和61.5W·m–1·K–1；1850℃下获得的SiC-AlN复相陶瓷在12.4~18GHz频率范围内获相对介电常数和介电损耗分别为33~37和0.4~0.5，该频段内随频率升高，介电常数和介电损耗下降。
英文摘要：
SiC-AlN composites with10%(mass fraction)BaO-SiO2-Y2O3additives were fabricated by pressureless sintering in a nitrogen atmosphere.The effects of SiC content and sintering temperature on the sinterability,microstructure,thermal conductivity and high-frequency dielectric properties were characterized.In addition to6H-SiC and AlN,the samples also contain Y3Al5O12and Y4Al2O9.The apparent porosity of sample with the mass fraction of50%SiC sintered at1850℃for1h is lower than0.3%.With the increasing of SiC content,the apparent porosity is increased significantly.Thermal conductivity,dielectric constant and dielectric loss increase with the raising of sintering temperature.SiC-AlN ceramics sintered with50%(mass fraction)SiC at1900℃exhibite the best thermal diffusivity and thermal conductivity,respectively26.3mm2·s-1and61.5W·m-1·K-1.The relative dielectric constant and dielectric loss of the sample sintered with50%mass fraction SiC at1850℃are33-37and0.4-0.5at12.4-18GHz.The dielectric constant and dielectric loss of the samples decrease as the frequency of electromagnetic waves rise from12.4GHz to18GHz.
同期刊论文项目
同项目期刊论文
期刊信息
位置：