Influence of Microstructures on Thermal Shock and Sintering Behavior of YSZ-based Thermal Barrier Coatings
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摘要
In this study, two thermal barrier coatings based on YSZ were produced by using a commercially available agglomerated and sintered powder and a special spray powder prepared by high energy ball milling. Both thermal barrier coatings exhibited similar overall porosities, but significantly different microstructures. Application of the special spray powder prepared by high energy ball milling led to a microstructure with numerous inclusions of semi-molten agglomerates, which introduced a plethora of clusters of fine pores into the coating and several more microstructural defects. This microstructure resulted in a significantly better thermal shock behavior compared to the conventional thermal barrier coating. The heat treatment of both thermal barrier coatings atθ=1150℃for t=100 h led to a sintering of both coatings. The results were reduced overall porosity and significantly increased fracture toughness. A correlation between the fracture toughness of both coatings after the heat treatment and the thermal shock life time could not be identified.
In this study, two thermal barrier coatings based on YSZ were produced by using a commercially available agglomerated and sintered powder and a special spray powder prepared by high energy ball milling. Both thermal barrier coatings exhibited similar overall porosities, but significantly different microstructures. Application of the special spray powder prepared by high energy ball milling led to a microstructure with numerous inclusions of semi-molten agglomerates, which introduced a plethora of clusters of fine pores into the coating and several more microstructural defects. This microstructure resulted in a significantly better thermal shock behavior compared to the conventional thermal barrier coating. The heat treatment of both thermal barrier coatings at θ=1150 ℃ for t=100 h led to a sintering of both coatings. The results were reduced overall porosity and significantly increased fracture toughness. A correlation between the fracture toughness of both coatings after the heat treatment and the thermal shock life time could not be identified.
In this study, two thermal barrier coatings based on YSZ were produced by using a commercially available agglomerated and sintered powder and a special spray powder prepared by high energy ball milling. Both thermal barrier coatings exhibited similar overall porosities, but significantly different microstructures. Application of the special spray powder prepared by high energy ball milling led to a microstructure with numerous inclusions of semi-molten agglomerates, which introduced a plethora of clusters of fine pores into the coating and several more microstructural defects. This microstructure resulted in a significantly better thermal shock behavior compared to the conventional thermal barrier coating. The heat treatment of both thermal barrier coatings at θ=1150 ℃ for t=100 h led to a sintering of both coatings. The results were reduced overall porosity and significantly increased fracture toughness. A correlation between the fracture toughness of both coatings after the heat treatment and the thermal shock life time could not be identified.
引文
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[2]LI C J,LI Y,YANG G J,et al.A novel plasma-sprayed durable thermal barrier coating with a well-bonded YSZinterlayer between porous YSZ and bond coat[J].Journal of thermal spray technology,2012,21:383-390.
[3]ZHAO Y,WANG L,YANG J,et al.Thermal aging behavior of axial suspension plasma-sprayed yttria-stabilized zirconia(YSZ)thermal barrier coatings[J].Journal of thermal spray technology,2015,24:338-347.
[4]GAO L H,GUO H B,WEI L L,et al.Microstructure and mechanical properties of yttria stabilized zirconia coatings prepared by plasma spray physical vapor deposition[J].Ceramic international,2015,41:8305-8311.
[5]WU J,GUO H B,ZHOU L,et al.Microstructure and thermal properties of plasma sprayed thermal barrier coatings from nanostructured YSZ[J].Journal of thermal spray technology,2010,19:1186-1194.
[6]LIMA R S,MARPLE B R.Toward highly sintering-resistant nanostructured ZrO2-7wt%Y2O3 coatings for TBC applications by employing differential sintering[J]Journal of thermal spray technology,2008,17:846-852.
[7]LIMA R S,MARPLE B R.Thermal spray coatings engineered from nanostructured ceramic agglomerated powders for structural,thermal barrier and biomedical applications:a review[J].Journal of thermal spray technology,2007,16:40-63.
[8]LIANG B,DING C.Thermal shock resistances of nanostructured and conventional zirconia coatings deposited by atmospheric plasma spraying[J].Surface and coatings technology,2005,197:185-192.
[9]BOBZIN K,ZHAO L,?TE M,et al.Deposition and characterization of thermal barrier coatings of ZrO2-4mol.%Y2O3-1 mol.%Gd2O3-1 mol.%Yb2O3[J].Surface and coatings technology,2015,268:205-208.
[10]BOBZIN K,ZHAO L,?TE M,et al.Effect of long-term heat treatment at 1150℃on the microstructure and properties of thermal barrier coatings based on ZrO2-4 mol.%Y2O3-1 mol.%Gd2O3-1 mol.%Yb2O3[J].Surface and coatings technology,2017,318:142-146.
[11]LAN W H,XIAO P.Fabrication of yttria-stabilizedzirconia thick coatings via slurry process with pressure infiltration[J].Journal of the european ceramic society2009,29:391-401.
[12]BOBZIN K,LUGSCHEIDER E,BAGCIVAN N.Thermal cycling behavior of lanthanum zirconate as EB-PVDthermal barrier coating[J].Advanced engineering materials,2006,8:653-657.
[13]QI H Y,YANG X G,WANG Y M.Interfacial fracture toughness of APS bond coat/substrate under high temperature[J].International journal of fracture,2009,157:71-80.
[14]WACHTMAN J B.Mechanical properties of ceramics[M].New York:Wiley,1996,392.
[15]GUO H B,VASSEN R,STOVER D.Atmospheric plasma sprayed thick thermal barrier coatings with high segmentation crack density[J].Surface and coatings technology2004,186:353-363.
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