TC4 合金微弧氧化涂层的组织结构与高温氧化行为研究

赵昕睿, 王树棋, 付博达, 陆寅松, 邹永纯, 陈国梁, 王亚明

doi:10.16577/j.issn.1001-1560.2023.0158

材料保护 >

2023 , Vol. 56 >Issue 7: 31 - 37

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0158

微弧氧化及液态等离子电解技术专栏

TC4 合金微弧氧化涂层的组织结构与高温氧化行为研究

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1.哈尔滨工业大学特种陶瓷研究所，黑龙江哈尔滨 150001；2.哈尔滨工业大学分析测试与计算中心，黑龙江哈尔滨 150008

王树棋(1994-)，讲师，博士，研究方向为特种功能涂层、微弧氧化功能涂层，电话:18845146528，E-mail:wangshuqi＠hit.edu.cn

收稿日期: 2023-04-17

修回日期: 2023-05-14

录用日期: 2023-06-12

网络出版日期: 2023-08-23

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Study on the Microstructure and High Temperature Oxidation Behavior of Micro-Arc Oxidation Coating on TC4 Alloy

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1.Institute for Advanced Ceramics，Harbin Institute of Technology，Harbin 150001，China；2.Center of Analysis Measurement and Computing，Harbin Institute of Technology，Harbin 150008，China

Received date: 2023-04-17

Revised date: 2023-05-14

Accepted date: 2023-06-12

Online published: 2023-08-23

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摘要

为了提高TC4 合金的高温抗氧化性能，采用微弧氧化方法在NaAlO2+ Na3PO4电解液体系中，于钛合金表面制备抗氧化陶瓷涂层。通过XRD、SEM、EDS 等方法，表征涂层的相组成和微观结构，用纳米压痕仪测试涂层硬度与弹性模量，并研究了微弧氧化涂层的抗高温氧化及抗热震性能。结果表明:微弧氧化涂层表面多孔，涂层以Al2TiO5和金红石型TiO2相为主。微弧氧化涂层的纳米硬度为(7.8±0.6) GPa，显著高于TC4 合金[(4.0±0.2)GPa]。微弧氧化涂层在700 ℃循环氧化80 h 后，单位面积增重仅0.73 mg/cm2，远小于TC4 合金的增重(20 mg/cm2)，表现出良好的高温抗氧化性能。经700 ℃热冲击25 次后，涂层未出现剥落现象，展现出良好的抗热震性能。由此可见，微弧氧化涂层能有效阻止氧的扩散，显著降低了钛合金基体的氧化速率，改善了钛合金的抗高温氧化性能。

关键词： TC4 合金; 微弧氧化; 组织结构; 高温抗氧化性能; 抗热震性能

本文引用格式

赵昕睿, 王树棋, 付博达, 陆寅松, 邹永纯, 陈国梁, 王亚明 . TC4 合金微弧氧化涂层的组织结构与高温氧化行为研究[J]. 材料保护, 2023 , 56(7) : 31 -37 . DOI: 10.16577/j.issn.1001-1560.2023.0158

Abstract

In order to improve the high temperature oxidation resistance of TC4 alloy，an anti-oxidation ceramic coating was prepared on the surface of titanium alloy by micro-arc oxidation in the NaAlO2+ Na3PO4 electrolyte system.The phase composition and microstructure of the coating were characterized by XRD，SEM and EDS，respectively.The hardness and elastic modulus of the coating were tested by nano indenter.In addition，the high temperature oxidation resistance and thermal shock resistance of the micro-arc oxidation coating were studied.Results showed that the surface of the micro-arc oxidation coating was porous.The coating was mainly composed of Al2TiO5 and rutile TiO2 phase.The nano hardness of microarc oxidation coating was (7.8 ± 0.6) GPa，significantly higher than that of TC4 alloy [(4.0 ± 0.2) GPa].After cyclic oxidation at 700 ℃for 80 h，the weight gain per unit area of micro-arc oxidation coating was only 0.73 mg/cm2，which was far less than the weight gains of TC4 alloy (20 mg/cm2)，showing good high temperature oxidation resistance.After 25 thermal shocks at 700 ℃，the coating had no scaling，indicating excellent thermal shock resistance.Hence，it could be seen that micro-arc oxidation coating could effectively prevent the diffusion of oxygen，significantly reducing the oxidation rate of titanium alloy and improving the high temperature oxidation resistance of titanium alloy.

Key words： TC4 alloy; micro-arc oxidation; microstructure; high temperature oxidation resistance; thermal shock resistance

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