高速刮擦条件下两种铝基封严涂层的可刮削性
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摘要
目前少有从涂层机械性能角度(如硬度、结合强度等)研究大量应用于我国航空发动机上的Al-BN涂层的材料性能及其在高滑动速度条件下的摩擦学行为。为此,以AlSi-PHb涂层为参比对象,对比了两者的材料性能,并通过自制的高速刮擦试验机对两者与对偶钛合金叶片在高速工况下的摩擦磨损行为进行了研究。结果表明:AlSi-PHb涂层的组织均匀性更好、机械性能更高;Al-BN涂层粘着叶片,AlSi-PHb涂层粘着叶片的同时还强烈地磨损叶片,两种铝基涂层的可刮削性均存在不足;涂层的机械性能对于叶片的损伤形式具有直接影响,机械性能高,则刮擦时摩擦热效应显著,涂层易损伤叶片;反之,则易于粘着叶片。适度的机械性能,是封严涂层获得良好可刮削性的关键所在。
Though Al-BN seal coating was widely used in the aeroengine of our country,little research work was reported on its tribological behaviors under high-speed sliding from the point of coating mechanical properties such as harness and cohesion strength.Therefore,taking AlSi-PHb coating as the reference object,the material properties of the two Al-based seal coatings were compared,and meanwhile,the tribological behaviors of the two coatings coupled with titanium blades were studied by a self-developed high-speed rubbing tester.The results show that the microstructure homogeneity and mechanical properties of the AlSi-PHb coating are better and higher than that of the Al-BN coating.Coating adhesion is the main wear mechanism of the Al-BN coating,while both blade wear and coating adhesion are for AlSi-PHb coating.The two coatings show deficiencies in the respect of abradability.Mechniacal properties have direct effect on the blade wear status.Coating with higher mechanical properties tends to damage the blade,and otherwise coating adhesion mechanism tends to occur.The moderate mechanical properties regulation is beneficial for the better abradability of the seal coating.
Though Al-BN seal coating was widely used in the aeroengine of our country,little research work was reported on its tribological behaviors under high-speed sliding from the point of coating mechanical properties such as harness and cohesion strength.Therefore,taking AlSi-PHb coating as the reference object,the material properties of the two Al-based seal coatings were compared,and meanwhile,the tribological behaviors of the two coatings coupled with titanium blades were studied by a self-developed high-speed rubbing tester.The results show that the microstructure homogeneity and mechanical properties of the AlSi-PHb coating are better and higher than that of the Al-BN coating.Coating adhesion is the main wear mechanism of the Al-BN coating,while both blade wear and coating adhesion are for AlSi-PHb coating.The two coatings show deficiencies in the respect of abradability.Mechniacal properties have direct effect on the blade wear status.Coating with higher mechanical properties tends to damage the blade,and otherwise coating adhesion mechanism tends to occur.The moderate mechanical properties regulation is beneficial for the better abradability of the seal coating.
引文
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[17]张佳平,袁福河,王璐,等.航空发动机封严涂层金相制备及显微组织检测技术[J].材料保护,2017,5(1):68-71.ZHANG J P,YUAN F H,WANG L,et al.Metallographic preparation and micro-structure testing techniques of abradable sealing coatings for aeroengines[J].Materials Protection,2017,5(1):68-71(in Chinese).
[18]郑海亮,高禩洋,薛伟海,等.高速刮擦条件下封严涂层热物性对叶片损伤行为的影响[J].中国表面工程,2017,30(6):149-157.ZHENG H L,GAO S Y,XUE W H,et al.Effects of thermalphysical property of seal coatings on blade wear behaviors under high-speed rubbing condition[J].China surface engineering,2017,30(6):149-157.
[19]XUAN H J,ZHANG N.Evaluation of an AlSi-polyester abradable seal coating performance using high-temperature and high-velocity abrasion tests[J].Journal of Engineering Tribology,2015:1-10.
[2]GHASRIPOOR F,SCHMID R,DORFMAN M.Abradables improve gas turbine efficiency[J].Materials world,1997,5(6):328-330.
[3]CHUPP R,HENDRICKS R,LATTIME S.Sealing in turbomachinery[J].Journal of Propulsion and Power,2006,22(2):313-349.
[4]WANG G,TENG B Q,WANG Z H,et al.The application and requirement of abradable seal coating on aero-engine[J].Thermal Spray Technology,2012,4(1):20-24.
[5]SCHMID R,GHASNIPOOR F,DORFMAN M.An overview of compressor abradable thermal spray[C].The 1st International Thermal Spray Conference,2000,1087-1093.
[6]SPORER D,WILSON S.Current and next-generation titaniumblade compatible compressor abradable coatings[J].Thermal Spray technology,2012,211(5):143-148.
[7]刘夙伟,李曙,刘阳.封严涂层材料及其可刮削性的评价[J].中国表面工程,2009,22(1):12-18.LIU S W,LI S,LIU Y.Seal coating and evaluation of its abradability coating on aero-engine[J].Thermal Spray Technology,2009,22(1):12-18(in Chinese).
[8]TAYLOR T,THOMPSON B,ATON W.High-speed rub wear mechanism in IN-718 VS NiCrAl-Bentonite[J].Surface&Coatings Technology,2007,202:698-703.
[9]XIE X X,ZHANG X,JI X J.Research of Room-temperature and high-temperature friction and wear properties of NiCrAl/B.e seal coating[J].Thermal Spray Technology,2011,3(1):23-28.
[10]STRINGER J,MARSHALL M.High speed wear testing of an abradable coating[J].Wear,2012,295(7):257-263.
[11]BOREL M,NICOLL A.The wear mechanisms occurring in abradable seals of gas turbines[J].Surface&Coatings Technology,1989,39-40,Part 1:117-126.
[12]BILL R,SHIEMBOB L.Friction and wear of sintered fibermetal abradable seal materials[J].Journal of Lubrication Technology-Transactions of the ASME,1977,99(4):421-427.
[13]GHASRIPOOR F,SCHMID R,DORFMAN M,et al.A review of clearance control wear mechanisms for low temperature aluminium silicon alloys[C].Proceedings of the 15th International Thermal Spray Conference,1998,139-144.
[14]BOUNAZEF M,GUESSASMA S,AIT SAADI B.The wear,deterioration and transformation phenomena of abradable coating BN-SiAl-bounding organic element,caused by the friction between the blades and the turbine casing[J].Materials Letters,2004,58(27-28):3375-3380.
[15]XUE W H,GAO S Y,DUAN D L,et al.Material transfer behaviour between a Ti6Al4V blade and an aluminium hexagonal boron nitride abradable coating during high-speed rubbing[J].Wear,2015,322-323:76-90.
[16]张彬,杨辉,王璐,等.基于ANSYS的封严涂层试验台高速主轴动力学分析[J].机械设计与研究,2015,31(2):20-24.ZHANG B,YANG H,WANG L,et al.Seal coating test rig of high-speed spindle based on ANSYS dynamic analysis[J].Machine design and research,2015,31(2):20-24.
[17]张佳平,袁福河,王璐,等.航空发动机封严涂层金相制备及显微组织检测技术[J].材料保护,2017,5(1):68-71.ZHANG J P,YUAN F H,WANG L,et al.Metallographic preparation and micro-structure testing techniques of abradable sealing coatings for aeroengines[J].Materials Protection,2017,5(1):68-71(in Chinese).
[18]郑海亮,高禩洋,薛伟海,等.高速刮擦条件下封严涂层热物性对叶片损伤行为的影响[J].中国表面工程,2017,30(6):149-157.ZHENG H L,GAO S Y,XUE W H,et al.Effects of thermalphysical property of seal coatings on blade wear behaviors under high-speed rubbing condition[J].China surface engineering,2017,30(6):149-157.
[19]XUAN H J,ZHANG N.Evaluation of an AlSi-polyester abradable seal coating performance using high-temperature and high-velocity abrasion tests[J].Journal of Engineering Tribology,2015:1-10.