Preparation and microstructure of Al2O3 ceramic particle-reinforced grey cast iron matrix composites
On the basis of optimizing the liquid immersion casting system through numerical simulation,Al2O3 particle reinforced gray cast iron based composite materials were prepared using straight runners with larger cross-sectional areas and transverse runners with lower heights.The microstructure analysis and mechanical performance testing were carried out.The results show that using a sprue with a larger cross-sectional area and a lower height sprue results in less turbulence during the filling process.The Al2O3 particle reinforced gray cast iron matrix composite material has a transition zone mainly composed of Si and Na.Compounds such as Na2SiO3 formed by the diffusion of Al,O,Si elements,and Fe diffusion into Al2O3 particles can improve the wettability of Al2O3 particles,optimize the casting infiltration effect,and promote the bonding between Al2O3 particles and gray cast iron matrix.Minimum microhardness of the transition layer is 165HV-235HV,and the microhardness of Al2O3 particles gradually increases to 2 005HV-2 230HV with increasing distance from the interface.The microhardness of the iron matrix increases with increasing distance from the interface and eventually stabilizes at 230HV-294HV.Yield strength of Al2O3 particle reinforced gray cast iron matrix composite material is 319.1 MPa,and the compressive strength is 519.5 MPa.
metal matrix compositesceramic particle reinforcementliquid casting infiltrationinterface bonding
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