烧结助剂和工艺对BeO陶瓷密度和热导率的影响  

Effects of sintering additives and process on density and thermal conductivity of BeO ceramic

作　　者：文丹华[1] 王日初[1] 朱学卫[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2007年第5期296-300,共5页Materials Science and Engineering of Powder Metallurgy

摘　　要：研究了TiO2、MgO、Fe2O3等不同烧结助剂、烧结温度及保温时间对BeO陶瓷的密度和热导率的影响,结果表明:添加Fe2O3和MgO的试样具有最高的密度(2.799 g/cm-3)和最高的热导率(181.6 W.m-1.K-1);同时在相同的保温时间下,其密度和热导率随烧结温度升高而增大;在相同的烧结温度下,其密度和热导率随保温时间延长而增大,但是增量比较小。运用黄培云的粉末烧结综合作用理论方程验证BeO烧结坯密度和烧结温度之间的对应关系,并从显微组织和理论上解释影响热导率的原因。The present paper investigated the effect of various kinds of additives, such as TiO2, MgO, Fe2Os and sintering process on the densities and thermal conductivities of BeO ceramic. Results show that the density（2.799 g·cm^-1） and thermal conductivity（181.6 W.m^-1·K^-1） of the samples added with Fe203 and MgO are the highest; and at the same holding time of temperature, the density and thermal conductivity increase along with the increment of the sintering temperature; at the same temperature, both of them increase along with the extension of the holding time. The relations between densities and sintering temperatuyes were verified through Huang Pei-yun＇s powders sintering synthesis theoretical equation. And the causes of effects on thermal conductivity were explained theoretically according to the microstructure observed with scanning electron microscope.

关 键 词：BeO瓷 烧结助剂 烧结工艺 密度 热导率 

分 类 号：TF125.31[冶金工程—粉末冶金]