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TC4合金表面扩散渗硅涂层的高温氧化行为和失效机制
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作者单位:

1.四川轻化工大学 机械工程学院;2.中联西北工程设计研究院有限公司

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中图分类号:

TG174

基金项目:

国家自然科学(No. 51961003); 陕西省重点研发计划(Nos. 2018GY-112, 2020GY-324); 钒钛资源综合利用四川省重点实验室开放课题(No. 2018FTSZ24), 自贡市科技局项目(Nos. 2017DZ10, 2019YYJC07)


High Temperature Oxidation Behavior and Failure Mechanisms of Silicide Diffusion Coating Deposited on TC4 Alloy
Author:
Affiliation:

1.College of Mechanical Engineering,Sichuan University of Science and Engineering;2.China United Northwest Institute for Engineering Design and Research Corporation,Xi’an

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    摘要:

    为提高钛合金的高温抗氧化性能,采用扩散固体粉末扩散渗方法在其表面制备了扩散渗硅涂层,研究了涂层的组织结构、高温氧化性能和失效机制。结果表明,所制备涂层具有致密的多层梯度组织结构,主要由TiSi2外层,TiSi中间层和Ti5Si4+Ti5Si3内层组成。高温氧化实验结果表明,涂层在850 ℃空气中氧化时表面形成了由SiO2和TiO2混合组成的保护膜,高温抗氧化性能优良;氧化过程中涂层与基体合金中Ti和Si的互扩散引起氧化膜内TiO2含量增加及Si源不足,导致氧化膜保护性变差;氧化产物与涂层较高的P-B比、氧化膜与涂层组织间热膨胀系数不匹配导致了氧化膜开裂和剥落。

    Abstract:

    Silicon diffusion coating has been prepared on TC4 alloy by pack cementation technique to improve its high temperature oxidation resistance. The microstructure, high temperature oxidation behavior and failure mechanisms of the coating were studied. The results show that the coating has a dense multilayer structure, mainly consisted of a TiSi2 outer layer, a TiSi middle layer, and a Ti5Si4+Ti5Si3 inner layer. The high temperature oxidation tests show that a protective scale composed of SiO2 and TiO2 formed on the surface of the coating during oxidizing at 850 ℃ in air, imposed to relatively good anti-high temperature oxidation property of the coating. The inter-diffusion of Ti and Si between the coating and the substrate caused the increase of TiO2 in the scale and lacking of Si source, resulting in the degeneration of the protective scale. The high P-B ratio between the oxides and the coating, together with the mismatch of the thermal expansion coefficients among the oxides and the coating should be the main factors responsible for cracking and spallasion of the scale.

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黄波,李轩,谢小青,来升,田进,田伟,柳忠彬. TC4合金表面扩散渗硅涂层的高温氧化行为和失效机制[J].稀有金属材料与工程,2021,50(2):544~551.[Hunag Bo, Li Xuan, Xie Xiaoqing, Lai Sheng, Tian Jin, Tian Wei, Liu Zhongbin. High Temperature Oxidation Behavior and Failure Mechanisms of Silicide Diffusion Coating Deposited on TC4 Alloy[J]. Rare Metal Materials and Engineering,2021,50(2):544~551.]
DOI:10.12442/j. issn.1002-185X.20200377

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  • 收稿日期:2020-06-01
  • 最后修改日期:2020-08-18
  • 录用日期:2020-08-28
  • 在线发布日期: 2021-03-09
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