钛合金表面低氧压熔结Al-Si涂层及抗氧化能力

周伟; 赵宇光

钛合金表面低氧压熔结Al-Si涂层及抗氧化能力

周伟,
赵宇光

吉林大学材料科学与工程学院及汽车材料教育部重点实验室, 长春130025

基金项目: 吉林省自然科学基金资助项目(20060628-1)

详细信息

中图分类号: TB 331
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出版历程
- 收稿日期: 2006-06-28
- 网络出版日期: 2007-07-31

Low oxygen partial pressure self-fusing Al-Si coating formed on surface of Ti alloy and its oxidation resistance

Key Laboratory of Automobile Materials,Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun 130025, China

摘要

摘要: 采用低氧压高温快速熔结技术在Ti-6Al-4V合金表面成功地制备出抗高温氧化的Al-Si熔结涂层.与Si改性渗涂层相比,这种工艺相对简单,不需要经过长时间的扩散就能形成足够厚度的Al-Si熔结涂层,省时节能,且涂层中抗氧化元素铝、硅的浓度可通过调整粉末的混合比例来进行控制.X射线检测表明涂层主要由Ti₅Si₃和TiAl₃组成.在923K空气中52h循环氧化试验结果表明:低氧压熔结Al-Si涂层在前10h的氧化过程中氧化增重较快,而在随后的氧化过程中氧化增重较为缓慢,而Si改性渗涂层在氧化过程中一直保持着较高的氧化速率.
- Ti-6Al-4V合金 /
- 低氧压熔结Al-Si涂层 /
- Si改性渗涂层 /
- 高温氧化
Abstract: An Al-Si fusing coating was successfully produced by means of the low oxygen partial pressure high-temperature fusing technique for the improvement of the high-temperature oxidation resistance of Ti-6Al-4V alloy. Unlike the Si-modified aluminide coating, this technique is much effective and cheap without the need for long time diffusion for the formation of the Al-Si fusing coating, and the concentrations of the oxidation-resistant elements, Al and Si, in the coating can be controlled by adjusting powder mixing ratio. X-ray diffraction(XRD) shows that the Al-Si fusing coating is mainly composed of Ti₅Si₃ and TiAl₃ phases. Cyclic oxidation tests at 923K for 52h in air reveals that the mass gains of the low oxygen partial pressure self-fusing Al-Si coating (LOPPF) is rapid in the initial 10h oxidation and keeps slow in the following oxidation; However, for the Si-modified aluminide coating, it keeps a rapid oxidation rate throughout the oxidation time.
- Ti-6Al-4V alloy /
- low oxygen partial pressure self-fusing coating /
- Si-modified aluminide coating /
- high-temperature oxidation

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