采用阳极氧化技术在含0.15 mol/L NH4F的乙二醇中对Ti45Al8.5Nb合金进行阳极氧化处理.研究阳极氧化Ti45Al8.5Nb合金的高温氧化性能和摩擦学行为.结果表明,由于保护性氧化层的产生,经阳极氧化处理的Ti45Al8.5Nb合金表现出良好的抗高温氧化性能.经1000℃氧化100 h后,阳极氧化Ti45Al8.5Nb合金的增重仅为0.37 mg/cm2.另一方面,阳极氧化Ti45Al8.5Nb合金的硬度和弹性模量随高温氧化时间的延长先降低后升高,主要原因是富Al2O3的最外层氧化层的生成.
The oxidation performance and tribological properties of the anodized Ti45Al8.5Nb were investigated. Anodization was performed in ethylene glycol containing 0.15 mol/L NH4F. Results showed that the anodized Ti45Al8.5Nb alloy exhibited good resistance against oxidation. After 100 h oxidation at 1000 ℃, the mass gain of the anodized Ti45Al8.5Nb alloy was only 0.37 mg/cm2. This is attributed to the generation of protective oxide scale. On the other hand, the hardness and elastic modulus of the anodized Ti45Al8.5Nb alloy decreased and then increased with the prolonging of thermal exposure due to the generation of the Al2O3-enriched outermost oxide layer.