热处理温度对金属Al增韧氧化铝多孔陶瓷支撑体断裂韧性的影响  

Effects of heating temperature on the fracture toughness of macroporous alumina supports added Al powder

作　　者：李改叶[1] 漆虹[1] 范益群[1] 徐南平[1] 

机构地区：[1]南京工业大学化学化工学院省部共建教育部材料化学工程重点实验室,南京210009

出　　处：《北京科技大学学报》2007年第2期135-138,共4页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究发展计划(No.2003CB615707);国家自然科学基金项目(No.20436030);江苏省高校自然科学研究计划(No.04KJB530043)

摘　　要：采用干压成型法,通过添加适量的金属Al粉来增韧Al2O3多孔支撑体,详细考察了热处理温度对多孔Al2O3/Al支撑体力学性能的影响,并借助于扫描电子显微镜(SEM)分析了样品的微观结构.研究结果表明:当热处理温度较低时,支撑体内部大量未氧化的铝相是支撑体断裂韧性提高的主要的原因;当热处理温度较高时,铝氧化产生体积膨胀,膨胀裂纹对支撑体断裂韧性的提高贡献很大.An amount of Al powder was added to toughen Al2O3 porous supports by dry press forming. Based on the toughening mechanism of Al2Oa/Al composite, the effects of heating temperature on the fracture toughness and bending strength of macroporous Al2O3/Al supports were investigated in detail, and the microstructure of specimens made of the supports was analyzed by SEM. The results show that the fracture toughness of the supports is influenced by calcining temperature. When the calcining temperature is low, unoxidized Al phase can absorb amount of fracture energy to make the fracture toughness of the supports high. But when the temperature is above 1200 ℃, the cracks which is occurred in the oxidation processing of Al phase can improve the fracture toughness of the supports, and the contribution of cracks is more important than the amount of Al phase to the fracture toughness of supports.

关 键 词：多孔陶瓷膜 支撑体 金属铝 断裂韧性 干压成型 

分 类 号：TQ174.75[化学工程—陶瓷工业]