摘要
为研究涂层断裂韧性对其摩擦学性能的影响,采用超音速火焰喷涂(HVOF)的方法在30CrMnSiA合金钢基体表面喷涂Cr_(3)C_(2)-NiCr和WC-17Co2类材料涂层。采用扫描电子显微镜(SEM)、维氏硬度计等分析了涂层的显微结构及力学性能;采用多功能摩擦磨损试验机测试了Cr_(3)C_(2)-NiCr和WC-17Co 2类涂层与30CrMnSiA摩擦副在干摩擦条件下的摩擦学性能。结果表明:Cr_(3)C_(2)-NiCr和WC-17Co涂层的显微硬度接近,分别为1068 HV0.3和1126 HV0.3;然而,Cr_(3)C_(2)-NiCr涂层的断裂韧性为2.45 MPa·m^(1/2),明显低于WC-17Co涂层的断裂韧性4.66 MPa·m^(1/2);在干摩擦工况下Cr_(3)C_(2)-NiCr较WC-17Co涂层更容易疲劳开裂,导致粒子脱落形成磨粒,对涂层及摩擦副产生严重的磨粒磨损;Cr_(3)C_(2)-NiCr的比磨损率为1.23×10^(-7)mm^(3)/(N·m),高于WC-17Co涂层的比磨损率[0.93×10^(-7)mm^(3)/(N·m)];与Cr_(3)C_(2)-NiCr涂层对磨的30CrMnSiA摩擦副的磨损失重为9.82 mg,高于与WC-17Co涂层对磨时的30CrMnSiA摩擦副磨损失重(8.43 mg)。
To investigate the influence of coating fracture toughness on tribological properties,Cr_(3)C_(2)-NiCr and WC-17Co coatings were deposi-ted on 30CrMnSiA alloy steel substrates using the high-velocity oxygen-fuel(HVOF)spraying method.The microstructure and mechanical properties of the coatings were characterized by scanning electron microscopy(SEM)and Vickers hardness tester.The tribological properties of two types of coatings(Cr_(3)C_(2)-NiCr and WC-17Co)against a 30CrMnSiA friction pair under dry sliding conditions were evaluated by multifunc-tional tribometer.Results showed that the microhardness of Cr_(3)C_(2)-NiCr and WC-17Co coatings was close,being 1068 HV_(0.3) and 1126 HV0.3,respectively.However,the fracture toughness of the Cr_(3)C_(2)-NiCr coating was measured as 2.45 MPa·m^(1/2),significantly lower than that of the WC-17Co coating(4.66 MPa·m^(1/2)).Under dry friction conditions,the Cr_(3)C_(2)-NiCr coating was more prone to fatigue cracking than the WC-17Co coating,resulting in particle detachment and the formation of abrasive particles,which further caused severe abrasive wear to the coating and the friction pair.The wear rate of Cr_(3)C_(2)-NiCr was 1.23×10^(-7)mm^(3)/(Nm),higher than that of WC-17Co coating[0.93×10^(-7)mm^(3)/(Nm)].Additionally,the wear weight loss of the 30CrMnSiA friction pair sliding against the Cr_(3)C_(2)-NiCr coating was 9.82 mg,which was higher than that of the 30CrMnSiA friction pair sliding against the WC-17Co coating(8.43 mg).
作者
范明祯
罗朝勇
王辉
顾宝军
董雪
张岩
杜鹏程
FAN Mingzhen;LUO Chaoyong;WANG Hui;GU Baojun;DONG Xue;ZHANG Yan;DU Pengcheng(China Academy of Machinery Wuhan Research Institute of Materials Protection Co.Ltd.,Wuhan 430030,China;State Key Laboratory of Special Materials Surface Engineering,Wuhan 430030,China;AECC Chengdu Engine Co.,Ltd.,Chengdu 610500,China;Wuhan Marine Machinery Plant Co.,Ltd.,Wuhan 430084,China)
出处
《材料保护》
2025年第11期20-27,共8页
Materials Protection
基金
国家科技重大专项(2024ZD0703601)。
