首页|Ti3AlC2-玻璃-陶瓷涂层对钛合金的高温抗氧化保护性能及机理

Ti3AlC2-玻璃-陶瓷涂层对钛合金的高温抗氧化保护性能及机理

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为改善玻璃涂层对钛合金的高温抗氧化保护效果,本研究通过球磨法在纯玻璃涂层浆料中引入Ti3AlC2增强相粉末,将浆料刮涂在TC4合金表面并进行抗氧化测试.结果表明,当Ti3AlC2添加量(质量分数)为5%(TAC5涂层)时,TC4合金基底a污染层的厚度最薄,约为65.78 μm.在相同测试条件下,TAC5涂层的α污染层厚度相比于纯玻璃涂层减少约四分之一.Ti3AlC2在1100~1300 K与O2反应的吉布斯自由能均为负值,结合BSE、XRD、Raman和TG等表征结果表明,Ti3AlC2与渗入涂层中的O2反应,优先生成Al2O3和TiO2,从而减少基底与氧气的接触,提高了涂层对TC4合金的高温抗氧化保护能力.同时,Ti3AlC2氧化生成的CO2气体在涂层表面和内部形成了微孔.
High-Temperature Antioxidation Protection and Mechanism of Ti3AlC2-Glass-Ceramic Coating on Titanium Alloy
In order to enhance the high-temperature antioxidation protection effect provided by glass coating on titanium alloy,Ti3AlC2 reinforcing phase was introduced into pure glass coating slurry by ball milling method,the slurry was scraped onto the surface of TC4 alloys,and the antioxidant test was conducted.The results show that when 5%(wt%)Ti3AlC2(TAC5 coating)is added,the thickness of α-contamination layer of the TC4 alloy substrate is minimized,measuring approximately 65.78 μm.In comparison to the pure glass coating under similar test condition,the thickness of α-contamination layer of the TAC5 coating is reduced by about one quarter.The Gibbs free energy of the reaction of Ti3AlC2 with O2 from 1100 K to 1300 K is negative.Combined with BSE,XRD,Raman and TG tests,the results show that Ti3AlC2 reacts with the oxygen infiltrated into the coating to preferentially generate Al2O3 and TiC2,which reduces the contact between the substrate and the oxygen and improves the high-temperature antioxidation protection of the coating.In the meantime,the surface and interior of the coating develop micropores due to the CO2 gas produced by the oxidation of Ti3AlC2.

titanium alloyglass-ceramic coatingantioxidationTi3AlC2

原豪杰、田馨、刘颖

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四川大学材料科学与工程学院,四川 成都 610065

钛合金 玻璃-陶瓷涂层 抗氧化 Ti3AlC2

四川省科技计划四川省科技计划重点研发项目

2023NSFSC09652023ZDZX0028

2024

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子:0.634
ISSN:1002-185X
年,卷(期):2024.53(10)