摘要
采用爆炸喷涂技术在Ti-22Al-26Nb(原子分数, ％)基体上制备了Ni-68.5Al(原子分数, ％)合金涂层,涂层在 退火后与基体结合良好.XRD分析表明,退火后涂层主要由β-NiAl以及少量Al3Ti和Al3Nb组成.研究了Ni-Al涂层 对Ti-22Al-26Nb合金在800℃静态空气中氧化性能的影响. Ti-22Al-26Nb合金氧化后主要生成了疏桧多孔的TiO2, 其抗高温氧化性能很差.施加Ni-Al涂层后,高温下生成了一层致密的Al2O3,氧化动力学曲线满足抛物线规律,抗氯化性能 显著提高.
Ni-68.5Al (atomic fraction, %) coatings were prepared on an orthorhombic alloy Ti-22Al-26Nb (atomic fraction, %) by detonation gun spraying (DS). After annealing, the Ni-Al coatings have a good adherence with the substrate, and XRD shows that the coatings mainly composed of beta-NiAl. The influence of Ni-Al coatings on the isothermal oxidation behaviors of Ti-22Al-26Nb was studied in static air at 800 V. For the alloy Ti-22AI-26Nb without coating, under high temperature oxidation a mixed oxide scale formed and consisted of TiO2, AlNbO4 and Al2O3, in which TiO2 is the dominant oxide phase and exhibits relatively poor oxidation resistance. The high temperature oxidation resistance of the specimens coated with Ni-Al coatings is remarkably improved due to the formation of a dense and adherent Al2O3 scale.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第3期312-316,共5页
Acta Metallurgica Sinica
基金
中国科学院方向性课题资助项目KGCX2-212-02
