送粉速率对等离子喷涂Mo_(2)NiB_(2)基金属陶瓷涂层性能的影响

Effect of Powder Feeding Rate on Properties of Plasma Sprayed Mo_(2)NiB_(2)-Based Cermet Coating

采用大气等离子喷涂法在Q235钢基体表面制备Mo_(2)NiB_(2)基金属陶瓷涂层,研究了送粉速率(40~80 g·min^(-1))对Mo_(2)NiB_(2)涂层硬度、结合强度、耐腐蚀性能的影响。结果表明:不同送粉速率下Mo_(2)NiB_(2)涂层主要由Mo_(2)NiB_(2)陶瓷相、MoNi_(4)合金相和MoB_(2)硬质相组成,在送粉速率为60 g·min^(-1)时涂层质量最佳;随着送粉速率的增大,Mo_(2)NiB_(2)涂层的硬度和结合强度先提高后下降,且均在送粉速率为60 g·min^(-1)时达到最大,分别为2107 HV,29.23 MPa;Mo_(2)NiB_(2)涂层的耐腐蚀性能随送粉速率的增大而增强,在送粉速率为80 g·min^(-1)时达到最佳。

Mo_(2)NiB_(2)-based cermet coating was prepared on the surface of Q235 steel substrate by atmospheric plasma spraying,and the effect of powder feeding rate(40-80 g·min^(-1))on the hardness,bonding strength and corrosion resistance of Mo_(2)NiB_(2) coating was studied.The results show that the Mo_(2)NiB_(2)coating was mainly composed of Mo_(2)NiB_(2) ceramic phase,MoNi_(4) alloy phase and MoB_(2) hard phase under different powder feeding rates,and the coating quality was the best when the powder feeding rate was 60 g·min^(-1).With increasing powder feeding rate,the hardness and bonding strength of Mo_(2)NiB_(2) coating increased first and then decreased and both reached the maximum values when the powder feeding rate was 60 g·min^(-1),which were 2107 HV and 29.23 MPa,respectively.The corrosion resistance of Mo_(2)NiB_(2) coating increased with increasing powder feeding rate,and reached the best level when the powder feeding rate was 80 g·min^(-1).