Study On Preparation And Microstructure Of ZTA Ceramic Particle Reinforced High Chromium Cast Iron Matrix Composites

In this paper,ZTA(alumina toughened zirconia)ceramics with different specifications are used as reinforcing particles,and high chromium cast iron is used as metal matrix.The surface of ZTA ceramic particles is plated with metal or coated with metal and compound powder.The ceramic particle preform is prepared by adhesive bonding.ZTA ceramic particle reinforced high chromium cast iron matrix composite is successfully prepared by negative pressure casting technology.The composites coated with Ni,Cu,CO and Cr,Al,B₄C,Fe₂O₃,Cr₂O₃ were successfully prepared.The microstructure,element distribution and phase composition of the interface of the composites were analyzed by SEM,EDS and XRD,and the effects of coating elements and active substances on the microstructure of the composites were explored,And the influence on casting infiltration and interface bonding.The conclusions are as follows:(1)There are significant aggregation of Si and Na,diffusion of Al and diffusion of Fe,Cr,C,O,Ni and Zr in the interface transition layer of nickel plated composite,and a variety of compounds,such as Al₂Cr,Ni Si₃P₄,Al₃Zr₂ and Zr₃Ni O are formed.Ni Si₃P₄ and Zr₃Ni O containing Ni can reduce the wettability of ceramics and improve the casting infiltration effect;(2)The results show that Al,Si and Na are obviously accumulated in the interface transition layer of cobalt plated composite,C,O,Fe,Cr and Co are diffused,and various compounds such as Co Al₂O₄,Co Cr₂O₄,Fe Co Cr O₄,Co₃O₄ and Co C are formed.These compounds can improve the wettability of ZTA ceramics and promote the casting infiltration and bonding of ZTA ceramics and high chromium cast iron;(3)In the interface transition layer of copper plated composite,Si and Na gather significantly,Al diffuse into the interface,and Fe,Cr,Cu,C,O,Zr diffuse into the interface;Moreover,Cu Al O₂,Al Cu₂Mn,Cu Cr O₄,Al₅Fe₂,Fe Zr2,Na Si Al O₄ and other compounds are formed to reduce the wettability of ceramics and improve the casting infiltration effect;(4)Coating Al,Cr+B₄C,Al+Cr₂O₃,Al+Fe₂O₃ and other active materials to form different compounds in the interface transition layer can improve the wettability,promote casting infiltration and strengthen the combination of ceramics and high chromium cast iron;...