Impact Properties of High Chromium Cast Iron Composite Reinforced by Zirconia Toughened Alumina Particles with Iron Coating
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 15‒30 µm 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.
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