铁包覆氧化锆增韧氧化铝颗粒增强高铬铸铁复合材料的冲击性能  

Impact Properties of High Chromium Cast Iron Composite Reinforced by Zirconia Toughened Alumina Particles with Iron Coating

作　　者：柴金荣 CHAI Jinrong(CCTEG Clean Energy Co.,Ltd.,Beijing 100013,China)

机构地区：[1]中煤科工清洁能源股份有限公司,北京100013

出　　处：《机械工程材料》2024年第8期25-29,共5页Materials For Mechanical Engineering

基　　金：中国煤炭科工集团有限公司科技创新创业资金专项项目(2023-MS003)。

摘　　要：采用铸渗工艺制备了铁包覆和无铁包覆氧化锆增韧氧化铝颗粒(ZTAp)增强高铬铸铁复合材料,对比研究了不同复合材料的微观形貌、微区成分和冲击性能。结果表明:无铁包覆ZTAp增强高铬铸铁复合材料中ZTAp与高铬铸铁间存在界面间隙,在制样中ZTAp发生脱落;铁包覆ZTAp增强高铬铸铁复合材料中的ZTAp嵌在高铬铸铁中,界面处无空洞、脱黏和分层等明显缺陷,且形成连续的厚度在15~30μm的界面层,可以提升界面结合性能;铁包覆ZTAp增强高铬铸铁复合材料的冲击韧度(2.1 J·cm^(-2))提升至无铁包覆时(0.5 J·cm^(-2))的4.2倍,失效方式由拔出失效转变为颗粒断裂失效,基体区断裂机制为准解理性断裂,界面层局部存在韧窝、撕裂棱等断裂特征。High chromium cast iron composites reinforced by zirconia toughened alumina particles(ZTAp)with and without iron coating were prepared by casting infiltration process.The microstructure,micro-composition and impact properties of the composite were studied comparatively.The results show that there was interfacial gap between ZTAp and high chromium cast iron in high chromium cast iron composite reinforced by ZTAp without iron coating,and the ZTAp fell off during sampling.ZTAp in high chromium cast iron composite reinforced by ZTAp with iron coating was embedded in the high chromium cast iron,and there were no obvious defects such as holes,detachment and delamination at the interface;a continuous interface layer with a thickness of 15‒30μm was formed,which could improve the high interface bonding performance.The impact toughness(2.1 J·cm^(−2))of high chromium cast iron composite reinforced by ZTAp with iron coating increased by 4.2 times compared with that of the composite without iron coating(0.5 J·cm^(−2)),and the failure mode changed from pull-out failure to particle fracture failure under iron coating condition,the fracture mechanism in the matrix region was quasi-solvable fracture,and the fracture characteristics such as dimple and tearing edge existed locally in the interface layer.

关 键 词：氧化锆增韧氧化铝颗粒 高铬铸铁 界面活性剂 冲击韧性 金属基复合材料 

分 类 号：TB331[一般工业技术—材料科学与工程]