液相氟化处理<strong>Ti45Al8.5Nb</strong>合金高温氧化行为研究

doi:10.11902/1005.4537.2025.040

中国腐蚀与防护学报

2025, Vol. 45

Issue (6): 1517-1527 CSTR: 32134.14.1005.4537.2025.040 DOI: 10.11902/1005.4537.2025.040

研究报告

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液相氟化处理Ti45Al8.5Nb合金高温氧化行为研究

庄钊涛, 严豪杰, 谢冰, 桂也, 孙擎擎, 伍廉奎(

), 曹发和

中山大学材料学院深圳 518107

High-temperature Oxidation Behavior of Liquid-phase Fluorination Treated Ti45Al8.5Nb Alloy

ZHUANG Zhaotao, YAN Haojie, XIE Bing, GUI Ye, SUN Qingqing, WU Liankui(

), CAO Fahe

School of Materials, Sun Yat-sen University, Shenzhen 518107, China

引用本文:

庄钊涛, 严豪杰, 谢冰, 桂也, 孙擎擎, 伍廉奎, 曹发和. 液相氟化处理Ti45Al8.5Nb合金高温氧化行为研究[J]. 中国腐蚀与防护学报, 2025, 45(6): 1517-1527.
Zhaotao ZHUANG, Haojie YAN, Bing XIE, Ye GUI, Qingqing SUN, Liankui WU, Fahe CAO. High-temperature Oxidation Behavior of Liquid-phase Fluorination Treated Ti45Al8.5Nb Alloy[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1517-1527.

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摘要:

TiAl合金作为一种新型的轻质高温结构材料，在航空航天领域具有广阔的应用前景。然而，抗高温氧化性能不足限制了TiAl合金的进一步应用。本研究采用新型溶剂热液相氟化处理技术，在Ti45Al8.5Nb合金表面引入氟化层，旨在促进合金表面原位生长出致密的Al₂O₃氧化层，进而提高合金的抗高温氧化性能。研究了液相氟化处理后Ti45Al8.5Nb合金在900 ℃空气中的氧化行为及氧化层组成与结构。结果表明：液相氟化处理可显著降低Ti45Al8.5Nb合金的氧化速率，经900 ℃氧化100 h后，液相氟化处理试样的氧化增重由未经处理试样的1.12 mg·cm^-2降至0.45 mg·cm^-2。液相氟化处理可促使Ti45Al8.5Nb合金表面生成连续且致密的Al₂O₃保护层，有效抑制了氧的内扩散，进而显著提高了合金的抗高温氧化性能。

关键词 ： TiAl合金, 液相氟化处理, 氟化效应, 抗高温氧化性能

Abstract：

As an emerging lightweight, high-temperature structural material, TiAl alloy holds broad application prospects in the aerospace field. However, its insufficient oxidation resistance limits its further application. In this study, a novel solvothermal liquid-phase fluorination treatment technique was applied to introduce a fluorinated layer on the surface of Ti45Al8.5Nb alloy, in order to promote the in-situ growth of a dense Al₂O₃ oxide layer on the alloy surface, thereby enhancing its high-temperature oxidation resistance. The oxidation behavior, as well as the composition and structure of the oxide layer, of the Ti45Al8.5Nb alloy after liquid-phase fluorination treatment were investigated in air at 900 ^oC. The results indicated that the liquid-phase fluorination treatment can significantly reduce the oxidation rate of the Ti45Al8.5Nb alloy. After oxidation at 900 ^oC for 100 h, the weight gain of the fluorinated alloy decreased from 1.12 mg·cm^-2 (for untreated ones) to 0.45 mg·cm^-2. The treatment facilitated the formation of a continuous and protective dense scale Al₂O₃ on the alloy surface, effectively suppressing the inward diffusion of oxygen and thereby significantly enhancing the alloy's high-temperature oxidation resistance.

Key words： TiAl alloy liquid-phase fluorination treatment fluoridation effect high-temperature oxidation resistance

收稿日期: 2025-02-04 32134.14.1005.4537.2025.040

ZTFLH:

TG174

基金资助:国家自然科学基金(52271084);广东省自然科学基金(2021B1515020056);松山湖材料实验室开发课题(2022SLABFK06)

通讯作者: 伍廉奎，E-mail：wulk5@mail.sysu.edu.cn，研究方向为材料腐蚀与防护

Corresponding author: WU Liankui, E-mail: wulk5@mail.sysu.edu.cn

作者简介: 庄钊涛，男，2000年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.040 或 https://www.jcscp.org/CN/Y2025/V45/I6/1517

图1 液相氟化处理流程示意图

图2 Ti45Al8.5Nb合金在无水及含1%，3%和5%水的NH4F乙二醇溶液中液相处理后表面形貌

表1 图2中各标记点处成分 (atomic fraction / %)

图3 Ti45Al8.5Nb合金在无水NH4F-乙二醇溶液中进行液相氟化处理后的XPS 全谱及Ti 2p，Al 2p，Nb 3d，O 1s和F 1s高分辨谱

图4 Ti45Al8.5Nb合金在含3%水的NH4F-乙二醇溶液中进行液相氟化处理后的XPS 全谱及Ti 2p，Al 2p，Nb 3d，O 1s和F 1s高分辨谱

图5 未处理及在含0%，1%，3%，5%水的NH4F-乙二醇溶液中液相氟化处理的Ti45Al8.5Nb合金试样900 ℃氧化动力学曲线

图6 无水体系中液相氟化处理后的样品经900 ℃氧化100 h后的XPS 全谱及Ti 2p，Al 2p，Nb 3d，O 1s和F 1s高分辨谱

图7 在含3%水体系中液相氟化处理后的样品经900 ℃氧化100 h后的XPS全谱及Ti 2p，Al 2p，Nb 3d，O 1s和F 1s高分辨谱

图8 未处理及在含0%，1%，3%和5%水的NH4F-乙二醇溶液中液相氟化处理的Ti45Al8.5Nb合金试样900 ℃氧化100 h后的XRD图谱

图9 未处理及在含0%，1%，3%，5%水的NH4F-乙二醇溶液中液相氟化处理的Ti45Al8.5Nb合金试样900 ℃氧化100 h后的表面形貌

表2 图9中各标记点处的成分 (atomic fraction / %)

图10 不同试样经900 ℃氧化100 h后的截面微观形貌及其对应的EDS面扫描、线扫描结果

表3 图10中各标记点处的成分 (atomic fraction / %)

图11 液相氟化处理机理示意图

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