激光重熔YSZ热障涂层950℃的热腐蚀行为
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摘要
研究了等离子喷涂热障涂层(TBCs)和激光重熔热障涂层在75%Na_2SO_4+25%NaCl (质量分数)熔盐中不同时间下的热腐蚀性能。通过SEM和XRD分析了热腐蚀后两种热障涂层表面和截面的微观形貌和物相组成。结果表明,未经过激光重熔的涂层在前50 h的热腐蚀过程中重量增加;在后续腐蚀过程中重量减小,100 h时腐蚀减重达到了6.8 mg/cm~2,同时出现了涂层剥落的现象;表面物相分析检测到ZrO_2和Y_2(SO_4)_3相。激光重熔热障涂层在热腐蚀过程中重量一直在增加;后期阶段趋于平缓,100 h时腐蚀增重为3.7 mg/cm~2;表面物相分析仅检测到ZrO_2相。激光重熔改善了热障涂层的抗热腐蚀性能。
The thermal barrier coating(TBC) of ZrO_2-7%Y_2O_3(mass fraction) was firstly prepared on high temperature alloy GH4169 and then remelted via CO_2 laser glazing technique. The hot corrosion behavior of the ordinary and the laser as-remelted TBCs are assessed in 75%Na_2SO_4+25%NaCl(mass fraction) molten salt for different time. The morphologies and phase composition of the two TBCs were characterized by means of scanning electron microscope and X-Ray Diffractometer. The results indicated that the ordinary TBC experienced mass gain in the first period of 50 h, hereafter, mass loss in the rest period of test. The total mass loss was about 6.8 mg/cm~2 after 100 h test. In the meanwhile spallation of the top surface of the coating did occur and phases of ZrO_2 and Y_2(SO_4)_3 could be detected by XRD on the coating surface. The mass gain versus time curve for the laser remelted TBC rose up gradually in the first stage, and then turned to be stable in the later stage. The total mass gain reached about 3.7 mg/cm~2 after 100 h test. It is noted that only ZrO_2 phase could be detected on the coating surface. It illustrated that the hot corrosion resistance of the TBCs has been further improved by laser remelted technique.
The thermal barrier coating(TBC) of ZrO_2-7%Y_2O_3(mass fraction) was firstly prepared on high temperature alloy GH4169 and then remelted via CO_2 laser glazing technique. The hot corrosion behavior of the ordinary and the laser as-remelted TBCs are assessed in 75%Na_2SO_4+25%NaCl(mass fraction) molten salt for different time. The morphologies and phase composition of the two TBCs were characterized by means of scanning electron microscope and X-Ray Diffractometer. The results indicated that the ordinary TBC experienced mass gain in the first period of 50 h, hereafter, mass loss in the rest period of test. The total mass loss was about 6.8 mg/cm~2 after 100 h test. In the meanwhile spallation of the top surface of the coating did occur and phases of ZrO_2 and Y_2(SO_4)_3 could be detected by XRD on the coating surface. The mass gain versus time curve for the laser remelted TBC rose up gradually in the first stage, and then turned to be stable in the later stage. The total mass gain reached about 3.7 mg/cm~2 after 100 h test. It is noted that only ZrO_2 phase could be detected on the coating surface. It illustrated that the hot corrosion resistance of the TBCs has been further improved by laser remelted technique.
引文
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[11]Wang D S,Tian Z J,Shen L D,et al.Hot corrosion resistance of plasma-sprayed conventional and nano-structured ZrO2-7%Y2O3thermal barrier coating[J].Hot Work.Technol.,2014,43(8):156(王东生,田宗军,沈理达等.等离子喷涂常规和纳米ZrO2-7%Y2O3热障涂层的热腐蚀性能[J].热加工工艺,2014,43(8):156)
[12]Jones R L.Some aspects of the hot corrosion of thermal barrier coatings[J].J.Therm.Spray Technol.,1997,6:77
[13]Tsai P C,Lee J H,Chang C L.Improving the erosion resistance of plasma-sprayed zirconia thermal barrier coatings by laser glazing[J].Surf.Coat.Technol.,2007,202:719
[14]Liu X J,Wang T,Li S S,et al.Formation and growth behavior of TGO in air plasma sprayed thermal barrier coatings at high temperature[J].Surf.Technol.,2015,44(11):91(刘小菊,王腾,李偲偲等.等离子喷涂热障涂层高温TGO的形成与生长研究[J].表面技术,2015,44(11):91)
[15]Guan H R,Li M H,Sun X F,et al.Investigation on oxidation and failure of the thermal barrier coating deposited on superalloy[J].Acta Metall.Sin.,2002,38:1133(管恒荣,李美姮,孙晓峰等.高温合金热障涂层的氧化和失效研究[J].金属学报,2002,38:1133)
[16]Krogstad J A,Lepple M,Levi C G.Opportunities for improved TBC durability in the CeO2-TiO2-ZrO2system[J].Surf.Coat.Technol.,2013,221:44
[17]Keyvani A,Saremi M,Sohi M H.An investigation on oxidation,hot corrosion and mechanical properties of plasma-sprayed conventional and nanostructured YSZ coatings[J].Surf.Coat.Technol.,2011,206:208
[2]Schwant R C,Thamboo S V,Anderson A F,et al.Large 718 forgings for land based turbines[A].Superalloys 718,625,706 and Various Derivatives[C].Warrendale,PA,1997
[3]Zhou H,Li F,He B,et al.Research progresses in materials for thermal barrier coatings[J].Mater.Rev.,2006,20:40(周洪,李飞,何博等.热障涂层材料研究进展[J].材料导报,2006,20:40)
[4]He Y D,Qi H B.Introduction to Material Corrosion and Protection[M].Beijing:China Machine Press,2005(何业东,齐慧滨.材料腐蚀与防护概论[M].北京:机械工业出版社,2005)
[5]Liu L J,Li J Q.Mold Laser Strengthening and Remanufacturing Technology[M].Beijing:Peking University Press,2012:136(刘立君,李继强.模具激光强化及修复再造技术[M].北京:北京大学出版社,2012:136)
[6]Long X Q.Mechanism of hot corrosion in high temperature parts of aeroengine[J].Total Corros.Control,2003,17(2):9(隆小庆.航空发动机高温部件热腐蚀机理的探讨[J].全面腐蚀控制,2003,17(2):9)
[7]Zhang Z Y.Researches on high temperature oxidation,hot corrosion and thermal shock of Y2O3-ZrO2thermal barrier coatings[D].Harbin:Harbin Institute of Technology,2010(张佐伊.Y2O3-ZrO2热障涂层高温氧化、腐蚀及抗热震性能研究[D].哈尔滨:哈尔滨工业大学,2010)
[8]Wang D S,Tian Z J,Shen L D,et al.Microstructure and high-temperature oxidation resistance of laser-remelted thermal barrier coatings on TiAl alloy surface[J].J.Funct.Mater.,2009,40:578(王东生,田宗军,沈理达等.TiAl合金表面激光重熔热障涂层组织及抗高温氧化性能[J].功能材料,2009,40:578)
[9]Batista C,Portinha A,Ribeiro R M.Morphological and microstructural characterization of laser-glazed plasma-sprayed thermal barrier coatings[J].Surf.Coat.Technol.,2006,200:2929
[10]Batista C,Portinha A,Ribeiro R M,et al.Evaluation of laserglazed plasma-sprayed thermal barrier coatings under high temperature exposure to molten salts[J].Surf.Coat.Technol.,2006,200:6783
[11]Wang D S,Tian Z J,Shen L D,et al.Hot corrosion resistance of plasma-sprayed conventional and nano-structured ZrO2-7%Y2O3thermal barrier coating[J].Hot Work.Technol.,2014,43(8):156(王东生,田宗军,沈理达等.等离子喷涂常规和纳米ZrO2-7%Y2O3热障涂层的热腐蚀性能[J].热加工工艺,2014,43(8):156)
[12]Jones R L.Some aspects of the hot corrosion of thermal barrier coatings[J].J.Therm.Spray Technol.,1997,6:77
[13]Tsai P C,Lee J H,Chang C L.Improving the erosion resistance of plasma-sprayed zirconia thermal barrier coatings by laser glazing[J].Surf.Coat.Technol.,2007,202:719
[14]Liu X J,Wang T,Li S S,et al.Formation and growth behavior of TGO in air plasma sprayed thermal barrier coatings at high temperature[J].Surf.Technol.,2015,44(11):91(刘小菊,王腾,李偲偲等.等离子喷涂热障涂层高温TGO的形成与生长研究[J].表面技术,2015,44(11):91)
[15]Guan H R,Li M H,Sun X F,et al.Investigation on oxidation and failure of the thermal barrier coating deposited on superalloy[J].Acta Metall.Sin.,2002,38:1133(管恒荣,李美姮,孙晓峰等.高温合金热障涂层的氧化和失效研究[J].金属学报,2002,38:1133)
[16]Krogstad J A,Lepple M,Levi C G.Opportunities for improved TBC durability in the CeO2-TiO2-ZrO2system[J].Surf.Coat.Technol.,2013,221:44
[17]Keyvani A,Saremi M,Sohi M H.An investigation on oxidation,hot corrosion and mechanical properties of plasma-sprayed conventional and nanostructured YSZ coatings[J].Surf.Coat.Technol.,2011,206:208
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