铝合金表面纳米Al_2O_3-40%TiO_2复相陶瓷涂层力学与摩擦学性能  被引量:14

Mechanical and Tribological Properties of Nanostructured Al_2O_3-40%TiO_2 Multiphase Ceramic Coatings on the Surfaces of Aluminum Alloy

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作  者:何龙[1] 谭业发[1] 屠义强[1] 杨自双[1] 董贵杨[1] 

机构地区:[1]解放军理工大学野战工程学院,南京210007

出  处:《机械工程学报》2013年第2期79-86,共8页Journal of Mechanical Engineering

摘  要:为提高铝合金零部件的耐磨性能,运用等离子喷涂技术在7005铝合金表面制备纳米Al2O3-40%TiO2(NAT40)复相陶瓷涂层,分析该涂层的微观结构,测试其主要力学性能,研究其在干摩擦和3.5%NaCl溶液中的摩擦行为与机制。结果表明:NAT40涂层的显微硬度为638.6 HV0.5,断裂韧度为13.3 MPa.m1/2,与基体的临界结合力达到80.35 N,均高于微米Al2O3-40%TiO2(MAT40)涂层。干摩擦时,随着载荷从3 N增大至12 N,NAT40涂层的摩擦因数从0.20上升至0.32,其磨损失重也从1.3 mg增大到2.2 mg;轻载3 N时,涂层以微观切削磨损为主,而在重载12 N条件下,磨损表面闪温计算值达到541.65℃,导致涂层的强度和硬度下降,磨损机理变为多次塑变磨损、粘着磨损和氧化磨损。在3.5%NaCl溶液摩擦环境中,NAT40涂层在相同载荷条件下的摩擦因数较干摩擦时显著降低,但重载(12 N)时,其磨损失重却比干摩擦时增加22.7%;随着载荷的增加,涂层的磨损机理由疲劳磨损转变为应力腐蚀磨损。In order to improve the wear resistance of aluminum alloy frictional parts, the nanostructured A1203-40%TiO2 (NAT40) multiphase ceramic coatings are prepared on the surfaces of 7005 aluminum alloy by plasma spray technology. The microstructure of the coating is analyzed and its main mechanical properties are tested. The tribological behavior and wear mechanisms of the coatings are investigated in dry and 3.5%NaC1 solution frictional conditions respectively. The results show that the microhardness of the NAT40 coating is 638.6 HV0.5, and its fracture toughness is 13.3 MPa.m^1/2, moreover, the critical adhesion strength between the coating and the substrate reaches 80.35 N, which are all higher than those of the micron A1203-40%TiO2 (MAT40) coating. In dry friction condition, the friction coefficients of the NAT40 coatings increase from 0.20 to 0.32 and the wear losses rise from 1.3 mg to 2.2 mg with the loads increasing from 3 N to 12 N. At the light load of 3 N, the NAT40 coating mainly suffers from micro-cutting wear. At the heavy load of 12 N, the calculated value of flash temperature on the worn surface is 541.65 ℃, which decreases the strength and hardness of the NAT40 coating, so the wear mechanisms turn into multi-plastic deformation wear, adhesive wear and oxidative wear. In 3.5%NaC1 solution, the friction coefficients of the NAT40 coatings are obvious lower than which in dry friction, however, the wear loss at 12 N increases by 22.7% compared with that in dry friction condition. The wear mechanisms of the NAT40 coating change from fatigue wear to stress corrosion wear as loads increase.

关 键 词:纳米Al2O3-40%TiO2涂层 等离子喷涂 断裂韧度 临界结合力 摩擦学 

分 类 号:TG174[金属学及工艺—金属表面处理]

 

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