Effect of explosive spraying process on mechanical properties of AlCuFe quasicrystal coatings
Quasicrystal material is a solid ordered phase with crystal structure between crystal and amorphous.AlCuFe quasicrystal alloy is currently viewed as a promising wear-resistant,corrosion-resistant and heat-insulating coating material due to its unique structure.However,the limitation of coating preparation technology makes it impossible to prepare high-quality quasicrystal coating.To improve the basic properties of AlCuFe quasi-crystal coating,the quasi-crystal coating was prepared on the surface of aluminum alloy substrate by explosive spraying technology.The L9(33)orthogonal test method was used to analyze the primary and secondary relationship of the three main spraying parameters,namely,the oxygen combustion charge gun ratio,spraying distance and spraying frequency,with the coating surface hardness and bonding strength as the main judging indexes.The results show that the oxygen burning charge gun ratio is the main factor affecting the performance of the coating,and the optimal process parameters are determined as the oxygen-fuel charging gun ratio of 56％,the spraying distance of 150 mm,and the spraying frequency of 4 guns/s.The prepared quasicrystal coating is dense and well combined with the substrate,with the spraying particles fully fused,the bonding strength of the coating reaching 31.5 MPa,the surface Vickers hardness 492HV0.3,the porosity 1.63％,and the quasicrystal phase content 50％.The research may lay a foundation for the preparation technology and a wide application of quasicrystal coatings in the future.
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