混料方式对氮化硅陶瓷力学性能和显微结构的影响  

EFFECTS OF BLENDING MANNERS ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF SILICON NITRIDE CERAMICS

作　　者：刘学建[1] 黄智勇[1] 黄莉萍[1] 张培志[2] 陈晓阳[3] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050 [2]上海材料研究所,上海200437 [3]上海大学,上海200072

出　　处：《硅酸盐学报》2004年第10期1310-1313,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50220160657);国家"863"计划(8633333030);上海市科技攻关(0152nm031;04DZ14002)资助项目。

摘　　要：借助扫描电镜、透射电镜、高分辨电镜、能量分散X射线等分析手段,研究了无压烧结氮化硅陶瓷材料的力学性能和显微结构,着重比较了粉料混合方式对材料力学性能和显微结构的影响。研究结果表明:行星式球磨机强化球磨混料可以有效地改善陶瓷粉料的混和效果,使烧结助剂均匀分布,抑制了晶粒的异常长大,有利于均匀结构的形成,力学性能也有不同程度的提高,而采用普通球磨混料方式制备的材料在局部区域产生晶粒异常长大情况。强化球磨混料制备氮化硅陶瓷的弯曲强度高达1.06GPa,Rockwell硬度达92,Vickers硬度达14.2GPa,断裂韧性达6.6MPa·m1/2。Mechanical properties and microstructure of pressureless sintering silicon nitride ceramics produced by different powder-blending manners were investigated by scanning electron microscope, transmission electron microscope, energy dispersive X-ray analysis, and high-resolution transmission electron microscope. For intensified blending by a high-energy planetary blender, sintering additives distributes symmetrically over matrix powders, which favors the development of uniform microstructure and the improvement of mechanical properties. However, some grains grow exceptionally in the local areas in general ball-milling manner. The silicon nitride ceramics by the intensified blending with flexure strength of 1.06 GPa, Rockwell hardness of 92, Vickers hardness of 14.2 GPa, and fracture toughness of 6.6 MPa&middotm1/2 were achieved.

关 键 词：氮化硅 混料方式 力学性能 显微结构 

分 类 号：TQ174.75[化学工程—陶瓷工业]