陶瓷粒径对PMN/EP复合材料结构与性能的影响  

The Effect of Ceramic Particle Size on Microstructure and Properties of PMN/EP Composites

作　　者：石敏先[1] 黄志雄[1] 何慧敏[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《高分子材料科学与工程》2010年第8期87-89,93,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(50772083)

摘　　要：以压电陶瓷铌镁锆钛酸铅(PMN)为功能相、环氧树脂(EP)为基体,采用树脂浇注成型方法制备了PMN/EP复合材料,研究了陶瓷粒径大小对复合材料结构与性能的影响。扫描电镜(SEM)分析表明,用大颗粒的粉料B(74μm～100μm)制备的复合材料中PMN颗粒之间出现"头碰头"或"肩并肩"的连接方式;而用粒径较小的粉料E(7μm～35μm)制备的复合材料,大部分以0-3型结构均匀分散在环氧树脂基体中。力学分析表明,随粒径的减小,PMN/EP复合材料的弯曲强度增大。随陶瓷颗粒粒径减小,复合材料的损耗因子最大值tanδmax增大;粉料E制备的复合材料具有较高的损耗因子,其tanδmax最大为0.724;随陶瓷颗粒继续减小,tanδmax有所降低,但阻尼温域拓宽,损耗面积TA相应增大。0-3 lead magnesium niobate-lead zirconate-lead titanate （PMN）/epoxy resin （EP）composites were prepared by resin casting method based on piezoelectric ceramic PMN as functional filler and epoxy resin as matrix. The effect of ceramic particle size on microstructure and mechanical properties of the composites was detected by scanning electron microscope （SEM） and mechanical analysis. SEM images indicate that the composites prepared with large particle size powder B（74 μm- 100 μm） show head-to- head or shoulder-to-shoulder connectivity. However, in composites prepared with small particle size powder E（7 μm--35 μm）, the most of ceramic particles disperses well by 0-3 connectivity in epoxy resin matrix. Mechanical test result shows that the flexural strength of PMNAEP composites increases with the drop of particle size. DMA curves of the composites are varied with the different piezoelectric ceramic particle size. With the particle size decrease, the peak value of loss factor（tanδmax） of PMN/EP composite increases, and the composite prepared with powder E shows the highest tanS＇ of 0.724. With the particle size further decrease, tanδmax of composite prepared with powder F（0.15μm-0.5μm） drops a little, but damping temperature range is widened and the loss area TA increases.

关 键 词：铌镁锆钛酸铅 环氧树脂 陶瓷粒径 显微结构 

分 类 号：TB333[一般工业技术—材料科学与工程]