AlN/玻璃复合材料的相分布对导热性能的影响  

Effect of Phase Distribution on Thermal Conductivity of A1N/glass Composites

作　　者：张擎雪[1] 李文兰[1] 徐素英[1] 庄汉锐[1] 严东生[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2003年第3期627-632,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(69836030)

摘　　要：以热压烧结方法在850～1000℃的低温下制备了Al/玻璃复合材料,通过组成变化研究了复合材料热导率的变化规律,利用SEM、TEM、XRD等方法观察了AlN/玻璃复合材料的显微结构和相组成与分布,讨论了复合材料的显微结构和相组成对热导率的影响,结果表明:AlN/玻璃复合材料的热导率随玻璃相的减少而增加,低温烧结的复合材料的热导率可以达到10W/m·K以上,材料的相分布对热导率的影响表现为:当玻璃相减少,AlN晶粒相互接触时,有利于热导率的提高;当材料内部以AlN晶相为主时,材料出现晶体的导热特征,即热导率随温度的升高而下降。AIN/borosilicate glass composites were prepared by hot-press sintering at low temperatures between 850degreesC and 1000degreesC. The microstructures of the composites were observed by SEM and TEM, and phases analyzed by XRD. The influences of g lass content and phase distribution in the composites on their thermal conductivities were investigated. The results show that the decrease in glass phase content will lead to the increase of thermal conductivities. When the glass content is 50wt%, the thermal conductivity(lambda) of the composite will increase with the increase of temperature. With 30wt% glass, lambda decreasing with the increase of temperature, the composite displays crystal characters.

关 键 词：AlN/玻璃复合材料 显微结构 相分布 热导率 

分 类 号：TQ174[化学工程—陶瓷工业]