玻璃成分对TiAl基合金高温氧化防护行为的影响

Influence of component of glass on protecting TiAl alloy in high temperature oxidation

研究不同成分的玻璃防护Ti-47Al-2Cr-0.2Mo(原子数分数,%)合金在1 200℃时的氧化行为。研究结果表明:在1 200℃时,黏流态的玻璃能很好地包裹在合金的表面,并随着玻璃成分的变化,对合金的保护效果发生明显的变化;当玻璃成分为60SiO2-23Na2O-17CaO(质量分数,%)时,包裹在合金表面的玻璃在1 200℃保温30 min后大部分脱落,防护效果降低;随着玻璃成分中SiO2质量分数的提高,玻璃脱落的面积逐渐减少;当玻璃成分为80SiO2-11Na2O-9CaO时,合金完全被玻璃包裹,有效地防止了合金被氧化。

Oxidation behaviors of different composition glasses protected Ti-47Al-2Cr-0.2Mo（atom fraction,%） alloy at 1 200 ℃ were investigated.The results indicate that the alloys are enwrapped in the viscous flow state glasses at 1 200 ℃.The protect effect changes obviously with different compositions of the glasses.After heat preservation at 1 200 ℃ for 30 min,most of the glasses desquamate and protecting ability decreases when the composition is 60SiO2-23Na2O-17CaO（mass fraction,%）.The desquamated area decreases with the increase of the content of SiO2.The alloy is enwrapped completely when glass composition is 80SiO2-11Na2O-9CaO,which can effectively prevent it from oxidation.