Sea Urchin Spines as a Model-System for Permeable,Light-Weight Ceramics with Graceful Failure Behavior.Part Ⅱ.Mechanical Behavior of Sea Urchin Spine Inspired Porous Aluminum Oxide Ceramics under Compression

Sea urchin spines were chosen as a model system for biomimetic ceramics obtained using starch-blended slip casting. Porous alumina ceramics with cap-shaped layers with different alternating porosities were found to have superior fracture behavior under bulk compression compared to ceramics with uniform porosity.They fail in a cascading manner,absorbing high amounts of energy during extended compression paths.The porosity variation in an otherwise single phase material mimicks the architectural microstructure design of sea urchin spines of Heterocentrotus mammillatus,which are promising model materials for impact protection.

管状多孔陶瓷膜载体的研制

对α－Ａｌ２Ｏ３多孔陶瓷的性能与起始粉料的关系进行了研究设计了脱外模熔模芯的注浆成型新工艺，成功地制备出外观圆直、管壁光滑的无机膜载体研究了烧结制度对陶瓷基管性能的影响，用扫描电镜观察了管的微观结构及形貌特征，并测定了气孔率及其孔径分布实验制备的载体管其内径７ｍｍ，壁厚１．５ｍｍ，管长２０ｃｍ，平均孔径１μｍ，孔隙率达４３％，可直接用于工业微滤过程。