燃烧合成氮化硅粉体对陶瓷导热性能的影响  

Effect of Combustion Synthesis Si_(3)N_(4) Powder on Thermal Conductivity of Ceramics

作　　者：张武[1] 韩晗 李辉 张楚君 李金富[1] Zhang Wu;Han Han;Li Hui;Zhang Chujun;Li Jinfu(No.52 Institute of China North Industry Group,Shandong,Yantai,264003,China)

机构地区：[1]中国兵器工业第五二研究所,山东烟台264003

出　　处：《陶瓷》2023年第8期56-59,95,共5页Ceramics

摘　　要：本文采用燃烧合成氮化硅粉体为原料,烧结助剂选择了MgO+Yb_(2)O_(3),采用气压烧结工艺制备了高性能的氮化硅陶瓷,讨论了燃烧合成的粉体对氮化硅陶瓷致密度、热导、物理性能和显微结构的影响。结果表明:添加4%MgO+8%Yb_(2)O_(3)的烧结助剂时,在1900℃气压处理10 h,烧结出了综合性能优异的氮化硅陶瓷。随着烧结助剂的减少,试样的热导率和物理性能下降;采用低氧β相氮化硅粉体烧结的试样热导率可达115.3 W/(m·K),优于采用α相制备的氮化硅陶瓷。在烧结过程中Yb_(2)O_(3)与Si_(3)N_(4)反应,以非晶或者部分结晶的形式残留在三叉晶界处,降低了固溶进氮化硅晶格中氧的含量,净化了氮化硅晶格,对氮化硅的导热有促进作用。Silicon nitride ceramics with high thermal conductivity were prepared by gas pressure sintering using combustion synthesis silicon nitride powder as a raw material and MgO+Yb_(2)O_(3)as sintering additive.The effects of different powders on the densification,thermal conductivity,mechanical properties and microstructure of silicon nitride ceramics were discussed.The results show that when the content of sintering additives is 4%MgO+8%Yb_(2)O_(3),the high thermal conductivity silicon nitride ceramics with excellent comprehensive properties can be prepared by sintering at 1900℃for 10 h.The thermal conductivity and mechanical properties of the samples decrease with the decrease of the content of sintering additives;The thermal conductivity of the sample sintered withβ-Si_(3)N_(4)powder can reach 115.3 W/(m·K),which is better than that of the sample sintered withα-Si_(3)N_(4)powder.During the sintering process,Yb_(2)O_(3)reacts with Si_(3)N_(4)forming a morphous or partially crystalline pinned at the trigeminal grain boundary,which reducing the content of oxygen in the solid solution of silicon nitride lattice,purifying the silicon nitride lattice,and improving the thermal conductivity of silicon nitride ceramics.

关 键 词：燃烧合成 氮化硅 气压烧结 热导率 物理性能 

分 类 号：TQ174.1[化学工程—陶瓷工业]