双辉技术渗铌对Ti-6Al-4V合金氧化性能的影响

Effect of Niobium Surface Alloying on the Antioxidation of Ti-6Al-4V

采用双辉等离子渗金属技术在Ti-6Al-4V表面形成均匀致密连续的渗铌合金层。将未渗铌和渗铌的Ti-6Al-4V试样分别在700℃,800℃,900℃进行100h的高温氧化实验,采用XRD,SEM及EDX对试样在900℃氧化100h后的氧化层的相组成、截面形貌及成分分布进行分析,初步探讨Ti-6Al-4V表面渗铌后的抗氧化性能及氧化机理。结果表明:渗铌后的Ti-6Al-4V合金氧化速率常数降低了1个数量级,氧化激活能提高,抗氧化性能明显改善。

Uniform, continous and compact niobium alloying layer was prepared on Ti-6Al-4V surface using double glow plasma surface alloying technique. The antioxidation behavior and mechanism of the alloyed layer were investigated and compared with the untreated Ti-6Al-4V surface at temperatures of 700℃, 800℃, 900℃for 100 h. The phases, cross-section morphology and composition were analyzed by XRD, SEM and GDA. The results show that the antioxidation behavior of Ti-6Al-4V alloy at 700℃-900℃ for 100 h was improved after niobium alloying process. The oxidation rate constants of alloyed layer were lower 1 order than that of Ti-6Al-4V and the oxidation activation energies were increased.