Nitrogen Absorption Behavior And Mechanism Of Tizrmnfe Getter Alloy

The getter alloy of TixZr1-xMnFe(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 N-2 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.