低压等离子喷涂NiCoCrAlYTa涂层的高温氧化行为
High-temperature Oxidation Behavior of Low-pressure Plasma Sprayed NiCoCrAlYTa Coatings
摘 要
采用低压等离子喷涂技术在钴基高温合金K640表面制备了NiCoCrAlYTa合金涂层,利用XRD、SEM和EDS等研究了涂层的高温氧化行为.结果表明:该涂层在900 ℃的恒温氧化动力学曲线符合抛物线规律,氧化速率常数Kp为0.33×10-6 mg2·cm-4·s-1;温度为1 050 ℃时,氧化初期的Kp值约为1.95×10-6 mg2·cm-4·s-1,随着氧化时间的延长,氧化速率迅速降低;涂层在氧化过程中,表面先形成θ-Al2O3,随着氧化时间的延长,θ-Al2O3向α-Al2O3转变,且氧化温度越高转变速率越快,900 ℃氧化120 h后涂层表面仍存在θ-Al2O3,而1 050 ℃氧化10 h后θ-Al2O3就已基本完全转变;氧化过程中,基体与涂层之间发生互扩散;氧化后涂层中析出白色的颗粒状富钽相.
NiCoCrAlYTa涂层
氧化膜
氧化行为
low-pressure plasma spray(LPPS)
NiCoCrAlYTa coating
oxide scale
oxidation behavior
Abstract
The NiCoCrAlYTa coatings were deposited on Co-based high-temperature alloy (K640) substrate by low-pressure plasma spraying(LPPS).The oxidation behavior of NiCoCrAlYTa coatings was evaluated by means of XRD,SEM and EDS.The results show that oxidation kinetic curves of the coating at 900 ℃ obeyed the parabolic law and the oxidation rate constant at 900 ℃ was 0.33×10-6 mg2·cm-4·s-1.The initial oxidation rate constant of the coating at 1 050 ℃ was 1.95×10-6 mg2·cm-4·s-1,and with the increase of oxidation time,the oxidation rate was decreased clearly.θ-Al2O3 was formed on the coating surface at the initial stage of oxidation.With the increase of oxidation time,θ-Al2O3 was transformed into α-Al2O3 and the transformation rate increased with the increase of oxidation temperature.There was still θ-Al2O3 on the coating surface oxidized at 900 ℃ for 120 h.The transformation of θ-Al2O3 into α-Al2O3 was observed after the coating was oxidized at 1 050 ℃ for 10 h.Interdiffusion of elements between Co-based alloy and the NiCoCrAlYTa coating was observed during the oxidation process.White Ta-rich precipitates were observed during the oxidation process.
中图分类号 TG174.44
所属栏目 试验研究
基金项目 中南大学博士后基金资助项目(76132017)
收稿日期 2008/3/23
修改稿日期 2008/9/12
网络出版日期
作者单位点击查看
备注周宏明(1974-),男,湖南株州人,副教授,博士后.
引用该论文: ZHOU Hong-ming,YI Dan-qing. High-temperature Oxidation Behavior of Low-pressure Plasma Sprayed NiCoCrAlYTa Coatings[J]. Materials for mechancial engineering, 2009, 33(5): 18～21
周宏明,易丹青. 低压等离子喷涂NiCoCrAlYTa涂层的高温氧化行为[J]. 机械工程材料, 2009, 33(5): 18～21
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【3】孙超,王启民,唐永吉,等.电弧离子镀NiCoCrAlY涂层的组织结构及初期氧化[J].金属学报,2005,41(11):1167-1173.
【4】夏长清,李佳,古一,等.NiCrAlY涂层/TC4基体界面反应机理[J].中南大学学报:自然科学版,2005,36(4):550-554.
【5】NICOLL A R,WAHL G.The effect of alloying additions of M-Cr-Al-Y systems－an experimental study[J].Thin Solid Films,1982,95(1):21-34.
【6】NICHOLLS J R,SIMMS N J,CHAN W Y.Smart overlay coatings-concept and practice[J].Surface and Coatings Technology,2002,149(2/3):236-244.
【7】GUO M H,WANG W M,KE P L.The preparation and hot corrosion resistance of gradient NiCoCrAlYSiB coatings surface and coatings technology[J].Surface and Coatings Technology,2006,200(12/13):3942-3949.
【8】GUDMUNDSSON B,JACOBSON B E.The effect of silicon and zirconium additions on the microstructure of vacuum-plasma-sprayed Co-Ni-Cr-Al-Y coating[J].Materials Science and Engineering A,1989,108(1):73-80.
【9】SCHULZ U,FRITSCHER K,PETERS M.EB-PVD Y2O3-and CeO2/Y2O3-stabilized zirconia thermal barrier coatings crystal habit and phase composition[J].Surface and Coatings Technology,1996,82(3):259-269.
【10】郝杉杉,刘海平,江晓全.真空电弧镀沉积NiCrAlY涂层工艺[J].材料工程,1999(2):40-43.
【11】WANG Q M,WU Y N,KE P L.Hot corrosion behavior of AIP NiCoCrAlY(SiB) coatings on nickel base superalloys[J].Surface and Coatings Technology,2004,186(3):389-397.
【12】李美姮,张重远,孙晓峰.真空热处理对镍基单晶高温合金溅射NiCrAlY涂层抗氧化性能的影响[J].中国腐蚀与防护学报,2002,22(3):153-157.
【13】徐爱群,黄海波,王世栋.磁控溅射NiCrAIY镀层的组织结构研究[J].东南大学学报,1996,26(4):136-138.
【14】BRANDL W,TOMA D,GRABKE H J.The characteristics of alumina scales formed on HVOF-sprayed MCrAlY coatings[J].Surface and Coating Technology,1998,108/109(1/3):10-15.
【15】武颖娜,华伟刚,纪爱玲.爆炸喷涂技术制备热障涂层的研究[J].金属学报,2002,38(10):1082-1086.
【16】张玉娟,孙晓峰,金涛,等.低压等离子喷涂NiCrAlY涂层的恒温氧化特征分析[J].材料保护,2003,36(1):14-16.
【17】张玉娟,孙晓峰,金涛,等.爆炸喷涂NiCrAlYTa涂层的微观组织分析[J].金属学报,2003,39(2):185-188.
【18】RYBICKI G C,SMIALEK K L.Effect of the θ→α-Al2O3 transformations on the oxidation behavior of the β-NiAl+Zr[J].Oxidation of Metals,1989,31(3):275-280.
【19】TAWANCY H M,ABBASA N M,BENNETT A.Role of Y during high temperature oxidation of an M-Cr-Al-Y coating on an Ni-base superalloy[J].Surface and Coatings Technology,1994,68/69:10-16.
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