Nitrogen absorption behavior and mechanism of TiZrMnFe getter alloy. (January 2021)

• Record Type: Journal Article
• Authors: Li, Lei; Zeng, Fanhao; Li, Wenjie; Wang, Ziwei; Liu, Honghao; Peng, Yirui; Gu, Yi; Song, Jiangfeng; Liu, Wensheng
• Is Part Of: Vacuum. Volume 183(2021)
• Publication Date: 2021-01
• Subjects: TiZrMnFe getter alloy -- Nitriding reaction -- XPS -- Absorption mechanism; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2020.109814
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: The getter alloy of Ti x Zr1- x MnFe( x = 0, 0.1, 0.2, 0.3, 0.4) was prepared by arc melting and its nitriding behavior was investigated. The as-produced TiZrMnFe alloys exhibit a single ZrMn2 C14 laves structure, and Ti is enriched on grain boundary. The nitrogen absorption kineticsshows that initial absorption rate slows down but final absorption amount increases with the substitution of Ti. The maximum absorption capacity improved to 0.00367 mol/g, a 31% rise compared to ZrMnFe. A new phase of (Zr, Ti)N formed during nitriding absorption, while the chemical states of the nitride alloys on surface was confirmed by XPS. A small quantity of oxygen was observed and the content of nitrogen decreases with depth increase. Nitrogen absorption process may be include absorbing and dissociating of N2 on surface, diffusing of nitrogen atoms, forming of (Zr, Ti)N phases, and finally (Zr, Ti)N particles growing up into dense barrier, resulting in absorption gradually saturated. Highlights: The as-produced TiZrMnFe getter alloys have an excellent nitrogen absorption capacity than ZrMnFe getter. The volume-weight conversion method is adopted for long-time nitrogen absorption experiments. The XPS with ion etching methods was used to characterize the surface and sub-surface after nitriding reaction. Nitrogen absorption process has been illustrated through analyzing the absorption performance and alloy structure.