艾伊昭彤 1任九龙 2强林芽 3张小珍 3杨凯 2高彦峰2
作者信息
- 1. 中国科学院上海硅酸盐研究所,中国科学院特种无机涂层重点实验室,上海 201899
- 2. 上海大学材料科学与工程学院,上海 200444
- 3. 景德镇陶瓷大学材料科学与工程学院,景德镇 333403
- 折叠
摘要
Abstract
Key components of aerospace power systems operating under extreme conditions,such as high loads,elevated temperatures,oxygen-rich environments,and wide-temperature-range alternating thermal shocks,impose stringent requirements on material mechanical properties,thermal stability,and oxidation resistance.Conventional thermally sprayed Al2O3 coatings,characterized by high hardness,excellent wear resistance,superior oxidation resistance,and good thermal stability,have been widely applied to aerospace,energy,and mechanical engineering fields.However,these coatings primarily consist of metastable γ-Al2O3 as the dominant crystalline phase,which exhibits inferior mechanical and thermal conductivity properties compared to α-Al2O3.This limitation hinders their effectiveness under extremely high-load conditions.To address this issue and enhance the overall coating performance,atmospheric plasma spraying(APS)was employed to fabricate Al2O3-GdAlO3(GAP)amorphous coating with a thickness of approximately 350 μm.The friction and wear behavior,along with the mechanical properties of the coating,were systematically investigated through a designed wear test under a load of 2000 N,a rotational speed of 500 r/min,and a duration of 1 h.Experimental results indicate that due to the high proportion of the amorphous phase and the optimized microstructure,the Al2O3-GAP coating exhibits excellent wear resistance and superior crack propagation resistance under high-speed and heavy-load friction conditions,significantly outperforming conventional polycrystalline Al2O3 coatings.Furthermore,the Al2O3-GAP coating demonstrates a lower and more stable friction coefficient,effectively reducing frictional surface temperature.This mitigates high-temperature oxidation and thermal damage while alleviating stress concentration effects.In summary,the Al2O3-GAP amorphous coating demonstrates remarkable advantages under high-load,high-speed friction conditions,providing a high-performance and reliable coating solution for the protection of critical aerospace power system components.关键词
大气等离子体喷涂/Al2O3-GdAlO3(GAP)/非晶陶瓷涂层/高承载耐磨性能Key words
atmospheric plasma spraying/Al2O3-GdAlO3(GAP)/amorphous ceramic coating/high-load wear resistance分类
化学工程
