Sm_2Zr_2O_7/YSZ-NiCoCrAlY功能梯度热障涂层热冲击应力
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摘要
采用有限元法研究了基体材质、厚度、涂层结构等因素对Sm2Zr2O7/YSZ-NiCoCrAlY功能梯度涂层热冲击应力的影响。结果表明,涂层表面区域存在较大的冲击热应力,径向热应力远大于轴向应力和剪切应力,而且在所考察的四种金属基体材料中,2Cr13钢对应涂层的热应力最小。随着基体厚度的增加,涂层径向热应力逐渐增大,当厚度超过25mm后,影响可以忽略。随着涂层层数的增加,涂层表面的径向热应力逐渐减小。
The influence of substrate materials, thickness and coating structure on thermal-shocking stresses in Sm2Zr2O7 / YSZ-NiCoCrAlY functional graded thermal barrier coatings was studied by finite element method. Results show that there exist large thermal stresses in the surface field of the current coating, radial stress is higher than axial and shear stress. The 2Cr13-steel coating has the lowest thermal stress in these coatings. With the increase of substrate thickness, radial stress increases gradually, and the influence of substrate thickness can be ignored if substrate thickness is greater than 25 mm. With the increasing of layer-number, radial stress at surface layer in coating decreased gradually.
The influence of substrate materials, thickness and coating structure on thermal-shocking stresses in Sm2Zr2O7 / YSZ-NiCoCrAlY functional graded thermal barrier coatings was studied by finite element method. Results show that there exist large thermal stresses in the surface field of the current coating, radial stress is higher than axial and shear stress. The 2Cr13-steel coating has the lowest thermal stress in these coatings. With the increase of substrate thickness, radial stress increases gradually, and the influence of substrate thickness can be ignored if substrate thickness is greater than 25 mm. With the increasing of layer-number, radial stress at surface layer in coating decreased gradually.
引文
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K.A.Khor,Y.W.Gu.Effects of residual stress on the performance of plasma sprayed functional graded ZrO2 /NiCoCrAlY coatings[J].Materials Science and Engineering,2000,A277:64-76.
马壮,王全胜,王富耻,吕广庶.涂层基体条件对梯度涂层残余应力影响研究[J].材料工程,2002,4:15-19
L.Wang,Y.Wang,X.G.Sun,et al.A novel structure design towards extremely low thermal conductivity for thermal barrier coatingsExperimental and mathematical study[J].Materials and Design,2012,35:505-517.
张红松,朱涛,魏媛.钙钛矿及A2 B2 O7 型热障涂层用陶瓷材料研究进展[J].稀土,2010,8:75-80.
R.Vaben,M.O.Jarligo,T.Steinke,et al.Overview on advanced thermal barrier coatings[J].Surface and Coatings Technology,2010:938-942.
Z.G.Liu,J.H.Ouyang,Y.Zhou,X.L.Xia.Effect of Ti substitution for Zr on the thermal expansion property of fluorite-type Gd2 Zr2 O7 [J].Materials Design,2009,30:3784-3788.
L.Ling,X.Qiang,W.F.Chi,Z.H.Song.Thermophysical properties of complex rare-earth zirconate ceramic for thermal barrier coatings[J].Journal of the American Ceramic Society,2008,91:2398-2401.
Z.H.S o n g,S.K u n,X.Q i a n g,W.F.Chi,L.Ling.Thermal conductivity of(Sm1 -x La x)2 Zr2 O7 (x=0,0.25,0.5,0.75 and 1)oxides for advanced thermal barrier coatings[J].Journal of Rare Earth,2009,4:222-226.
Z.H.Xu,L.M.He,R.D.Mu,et al.Doubleceramic-layer thermal barrier coatings based on La2 Zr2 O7 /YSZ deposited by electron beam-physical vapor deposition[J].Journal of Alloys and Compounds,2009,473:509-515.
Z.H.Xu,L.M.He,R.D.Mu,et al.Thermal cycling behavior of YSZ and La2 (Zr0 .7Ce0 .3)2 O7 as double-ceramic-layer systems EB-PVD TBCs[J].Journal of Alloys and Compounds,2012,525:87-96.
L.Wang,Y.Wang,X.G.Sun,et al.Thermal shock behavior of 8YSZ and double-ceramic-layerLa2 Zr2 O7 /8YSZ thermal barrier coatings fabricated by atmospheric plasma spraying[J].Ceramics International,2012,38:3595-3606.
W.Ma,H.Y.Dong,H.B.Guo,et al.Thermal cycling behavior of La2 Ce2 O7 /8YSZ double-ceramiclayer thermal barrier coatings prepared by atmospheric plasma spraying[J].Surface and Coatings Technology,2010,204:3366-3370.
W.M,S.K.Gong,H.F.Li,et al.Novel thermal barrier coatings based on La2 Ce2 O7 /8YSZ doubleceramic-layer systems deposited by electron beam physical vapor deposition[J].Surface and Coatings Tech nology,2008,202:2704-2708.
G.Moskal,L.Swadzba,M.Hetmanczky,et al.Characterization of the microstructure and thermal properties of Nd2 Zr2 O7 and Nd2 Zr2 O7 /YSZ thermal barrier coatings[J].Journal of the European Ceramic Society,2012,32:2035-2042.
X.L.Chen,L.J.Gu,B.L.Zou,Y.Wang,X.Q.Cao.New functionally graded thermal barrier coatings system based on LaMgAl11 O19 /YSZ prepared by air plasma spraying[J].Surface Coatings and Technology,2012,206:2265-2274.
C.S.Ramachandran,V.Balasubramanian,P.V.Ananthapadmanabhan,V.Viswabaskaran.Influence of intermixed interfacial layers on the thermal cycling behaviour of atmospheric plasma sprayed lathanum zirconate based coatings[J].Ceramics International,2012,38:4081-4096.
刘燕明,时蕾.不同基体条件下Sm2 Zr2 O7 /YSZ热障涂层的残余应力[J].中国陶瓷,2011,11:33-37.
毕建平,陈晓鸽,张红松.基体条件对等离子喷涂Sm2 Zr2 O7 /NiCoCrAlY功能梯度热障涂层热冲击性能影响[J].稀土,2012,8:54-58.
Ishikawa T.Thermal deformation&thermal stress of FGM plates under steadily gradient temperature fields[J].Proc The Frist International symp FGM,Sendai,1990,11-16.
Liu.Y,Gao.Y.F,Tao.S.Y,et al.La2 O3 -modified YSZ coatings:high-temperature satbility and improved thermal barrier properties[J].Surface and Coatings Tech nology,2009,203:1014-1019.
肖金生,刘杰,潘春旭,等.陶瓷/金属梯度热障涂层的热冲击性能研究[J].武汉理工大学学报,2002,9:11-14.
K.A.Khor,Y.W.Gu.Effects of residual stress on the performance of plasma sprayed functional graded ZrO2 /NiCoCrAlY coatings[J].Materials Science and Engineering,2000,A277:64-76.
马壮,王全胜,王富耻,吕广庶.涂层基体条件对梯度涂层残余应力影响研究[J].材料工程,2002,4:15-19