共挤压成形NiFe_2O_4-10NiO/xNi金属陶瓷材料的增韧特性  

Toughness characteristics of NiFe_2O_4-10NiO/xNi cermet prepared by co-extrusion process

作　　者：李志友[1] 张雷[1] 周科朝[1] 杨文杰[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2008年第4期729-734,共6页Journal of Central South University:Science and Technology

基　　金：国家"973"计划资助项目(2005CB623703)

摘　　要：采用共挤压技术制备具有蜂窝状结构的NiFe2O4-10NiO/xNi型金属陶瓷材料,研究其共挤压特征,并通过对比蜂窝结构材料与均匀体材料试样间力学性能的差异,分析蜂窝结构NiFe2O4-10NiO/xNi材料的增韧特性。研究结果表明,与均匀体材料相比,蜂窝状结构材料NiFe2O4-10NiO/xNi无论在横截面还是在纵截面上均能够更有效地提高材料的断裂韧性,同时,其纵截面上的增韧效果要比其横截面的增韧效果明显,纵截面上的断裂韧性比横截面上的断裂韧性高17.3%左右,比相同金属含量均匀体材料的断裂韧性至少高15.5%。NiFe2O4-10NiO/xNi cermet with cellular shape microstructure was prepared in co-extrusion process, and the co-extrusion behavior of this material was studied. The mechanical property of the cermet with cellular shape microstructure was researched by comparing the uniform structure cermet with the same Ni content. The results show that the cellular structure cermet has better fracture toughness property at both cross-section and longitudinal-section than that of the uniform cermet, the value of fracture toughness at cross-section is 17.3% higher than that of longitudinal-section for the materials with cellular microstructure, and at least 15.5% higher than that of the uniform materials with the same Ni content.

关 键 词：NiFe2O4—10NiO/xNi 共挤压 蜂窝状微结构 断裂韧性 

分 类 号：TG148[一般工业技术—材料科学与工程] TD353.6[金属学及工艺—金属材料]