硅质海绵骨针的结构及力学性能  

Structure and Mechanical Properties of Silica Sponge Spicule

作　　者：乔莉[1] 冯庆玲[1] 王晓红[2] 王毅民[2] 

机构地区：[1]清华大学先进材料教育部重点实验室,材料科学与工程系,北京100084 [2]国家地质实验测试中心,北京100037

出　　处：《无机材料学报》2008年第2期337-340,共4页Journal of Inorganic Materials

基　　金：国家自然科学基金(50402023);国家重点基础研究“973计划”(2007CB815600)

摘　　要：研究了我国渤海海域发现的一种硅质海绵骨针的结构和力学性能.结果表明,这种海绵骨针具有复杂的四级结构:第一级是纳米硅球;第二级是二氧化硅层内的亚层结构,第三级是单层二氧化硅层;第四级是二氧化硅一有机基质复合的同心圆结构.这种骨针的弯曲强度为394.34GPa,弯曲模量随生长环带由中心向外逐渐增大;截面硬度为2.933GPa,截面杨氏模量为33.308GPa.The structure and mechanical properties of silica sponge spicule found in China Bo-hai were studied. The results show that this spicule has the complex hiberarchy： the first tier is nano silica particles; the second tier is the sub-rounds within one silica round; the third tier is silica rounds composed of several parallel sub-rounds; the fourth tier is homocentric round structure with alternant deposition of silica and organic matrix. The flexural strength of this spicule is 394.34GPa, the flexural modulus increases with the growth direction of rounds. The cross-sectional hardness is 2.933GPa, and the cross-sectional Yang＇s modulus can reach 33.308GPa.

关 键 词：海绵骨针 二氧化硅 分级结构 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]