占空比对发动机用钛合金表面微弧沉积Al2O3 - TiO2涂层结构和力学性能的影响

朱斌

doi:10.16577/j.issn.1001-1560.2022.0256

材料保护 >

2022 , Vol. 55 >Issue 9: 122 - 125

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0256

工艺探讨

占空比对发动机用钛合金表面微弧沉积Al₂O₃ - TiO₂涂层结构和力学性能的影响

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(浙江农业商贸职业学院，浙江绍兴 312000)

朱斌(1984-)，硕士学位，讲师，研究方向为汽车材料、汽车车身维修，电话：15325231739，E - mail：58122265@qq.com

收稿日期: 2022-03-13

修回日期: 2022-04-28

录用日期: 2022-05-24

网络出版日期: 2023-12-23

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Effect of Duty Cycle on the Microstructure and Mechanical Properties of Micro - Arc Deposited Al₂O₃ - TiO₂ Coating on the Surface of Ti Alloy for Engine

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(Zhejiang Agricultural Business College, Shaoxing 312000, China)

Received date: 2022-03-13

Revised date: 2022-04-28

Accepted date: 2022-05-24

Online published: 2023-12-23

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摘要

为改善钛合金的综合性能以满足生产发动机的要求，采用微弧沉积技术对发动机用钛合金表面进行改性。利用不同的脉冲占空比(30%、40%、50%)制备了3种不同的Al2O3 - TiO2微弧沉积涂层。利用场发射电子显微镜观察沉积涂层的表面形貌；利用金相显微镜测试涂层厚度；利用激光共聚焦显微镜测量沉积涂层的表面粗糙度；利用纳米压痕仪测试沉积涂层的弹性模量和硬度，研究了占空比对发动机用钛合金表面微弧沉积Al2O3 - TiO2涂层结构和力学性能的影响。结果表明：在30%、40%、50% 3种不同脉冲占空比下制备的Al2O3 - TiO2涂层的平均厚度逐渐增大；随着脉冲占空比的增大，沉积涂层的表面粗糙度Ra下降，占空比为50%时，微弧沉积涂层的Ra达到最小值，约为2 μm；当脉冲占空比由30%变为50%时，Al2O3 - TiO2微弧沉积涂层表面的微孔数量逐渐增多，微孔的半径减小，表面更均匀；当脉冲占空比为50%时，制备的Al2O3 - TiO2涂层具有最大的硬度和弹性模量。

关键词： 微弧沉积; 钛合金; 脉冲占空比; 结构; 力学性能

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朱斌 . 占空比对发动机用钛合金表面微弧沉积Al₂O₃ - TiO₂涂层结构和力学性能的影响[J]. 材料保护, 2022 , 55(9) : 122 -125 . DOI: 10.16577/j.issn.1001-1560.2022.0256

Abstract

In order to improve the comprehensive properties of titanium alloys to meet the requirements for the production of engines, the micro - arc deposition technology was used to modify the surface of titanium alloys for engines. Three different micro - arc deposited Al2O3 - TiO2 coatings were prepared with different pulse duty cycles (30%, 40% and 50%). The surface morphology of coatings was observed by field emission electron microscope, the thickness of coatings was measured by metallographic microscope, the surface roughness of coatings was measured by laser confocal microscope, the elastic modulus and hardness of coatings were measured by nanoindenter, and the effect of duty cycle on the structure and mechanical properties of micro - arc deposited Al2O3 - TiO2 coatings on titanium alloys for engines were investigated systematically. Results showed that the average thickness of the Al2O3 - TiO2 coating increased as the duty cycle increased from 30% to 40% and 50%. With the increase of pulse duty cycle, the surface roughness (Ra) of the as - deposited coating decreased, which reached the minimum of about 2 μm under the duty cycle of 50%. When the pulse duty ratio changed from 30% to 50%, the number of micropores on the surface of the Al2O3 - TiO2 micro - arc deposition coating gradually increased, the radius of the micropores decreased, and the surface was more uniform. When the pulse duty cycle was 50%, the prepared Al2O3 - TiO2 coating had the highest hardness and elastic modulus.

Key words： micro - arc deposition; titanium alloy; pulse duty cycle; microstructure; mechanical properties

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