Effects of SiC on Microstructure and Properties of AlCuFeNiCo High-entropy Alloy Coating Prepared by Argon Arc Cladding

In order to meet the properties requirements of the alloy coating on the first and second thrust surfaces of the tooth claw, improve the quality and production efficiency of the first and second thrust surfaces, different contents of SiC were added into the AlCuFeNiCo high-entropy alloy coating which were prepared by argon arc cladding. Influence of the SiC content on the properties of the coating was studied. It is expected to replace Co119 alloy with AlCuFeNiCoSiCx high-entropy alloy in the first and second thrust surfaces of the claw. The results show that AlCuFeNiCoSiCx high-entropy alloy coatings are all composed of fcc and bcc phases. And with SiC content increasing, the content of bcc phase increases first and then decreases. Hardness change has the same rule with that. Hardness of AlCuFeNiCoSiC0. 25 high-entropy alloy coating can achieve 61. 7HRC, which reaches the requirements of the factories for the second thrust surface. Compared with Co119 alloy coating, hardness of AlCuFeNiCoSiC0. 25 high-entropy alloy coating is more uniform and can be increased by 4. 5HRC. And the wear resistance is increased by 43. 9%. Meanwhile, under the premise of substrate preheating, the use of argon arc cladding will not cause cracks. Therefore, AlCuFeNiCoSiC0. 25 high-entropy alloy coating prepared by argon arc cladding is more suitable for using on the first and second thrust surfaces.