等离子喷涂Sm_2Zr_2O_7/8YSZ热障涂层热冲击应力的数值模拟
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摘要
热障涂层的热冲击应力对其热冲击性能有重要影响,有关其热冲击应力的研究鲜见报道。采用有限单元法研究了基体材质、厚度对等离子喷涂Sm2Zr2O7/8YSZ热障涂层水淬热冲击应力的影响,并与8YSZ涂层比较。结果表明:涂层内存在较大径向冲击热应力,其值随基体热膨胀系数增加而增大;随基体厚度增加,径向应力逐渐增加,厚度超过25 mm后对径向应力无影响;剪切压应力的绝对值随基体厚度增加而增大,基体厚度超过20 mm后趋于稳定;基体厚度对轴向应力无影响;该涂层的抗热冲击性能优于传统8YSZ涂层。
The effects of thermal expansion coefficient and thickness of substrates on water-quenching thermal-shocking behavior of plasma-sprayed Sm_2Zr_2O_7-zirconia stabilized by 8%yitria thermal barrier coating(denoted as Sm_2Zr_2O_7/8YSZ) were studied by finite element method,and comparative study with conventional 8YSZ coating was also conducted.Results showed that there was relatively high radial thermal-shocking stress in as-prepared Sm_2 Zr_2 O_7/8YSZ thermal barrier coating.The radial thermal shocking stress of Sm_2Zr_20_7/8YSZ thermal barrier coating tended to gradually increase with increasing thermal expansion coefficient and thickness of substrates,but it keeped unchanged when the thickness of the substrates was above 25mm.In the meantime, the absolute values of shear stress of Sm_2Zr_20_7/8YSZ thermal barrier coating tended to gradually rise with increasing thickness of the substrates,but it keeped almost unchanged when the thickness of the substrates was above 20 mm.Moreover,the thickness of substrates had no influence on the axial thermal stress of Sm_2Zr_2O7/8YSZ thermal barrier coating.Sm_2 Zr_2 O_7/8YSZ thermal barrier coating had much better thermal-shocking behavior than conventional 8YSZ coating.
The effects of thermal expansion coefficient and thickness of substrates on water-quenching thermal-shocking behavior of plasma-sprayed Sm_2Zr_2O_7-zirconia stabilized by 8%yitria thermal barrier coating(denoted as Sm_2Zr_2O_7/8YSZ) were studied by finite element method,and comparative study with conventional 8YSZ coating was also conducted.Results showed that there was relatively high radial thermal-shocking stress in as-prepared Sm_2 Zr_2 O_7/8YSZ thermal barrier coating.The radial thermal shocking stress of Sm_2Zr_20_7/8YSZ thermal barrier coating tended to gradually increase with increasing thermal expansion coefficient and thickness of substrates,but it keeped unchanged when the thickness of the substrates was above 25mm.In the meantime, the absolute values of shear stress of Sm_2Zr_20_7/8YSZ thermal barrier coating tended to gradually rise with increasing thickness of the substrates,but it keeped almost unchanged when the thickness of the substrates was above 20 mm.Moreover,the thickness of substrates had no influence on the axial thermal stress of Sm_2Zr_2O7/8YSZ thermal barrier coating.Sm_2 Zr_2 O_7/8YSZ thermal barrier coating had much better thermal-shocking behavior than conventional 8YSZ coating.
引文
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[2]Zhu C,Li P,Javed A,et al.An investigation on the microstructure and oxidation behavior of laser remelted air plasma sprayed thermal barrier coatings[J].Surface and Coatings Technology,2012,206:3 739~3 746.
[3]Ptaszek G,Cawley P,Almond D,et al.Artificial disbonds for calibration of transient thermography inspection of thermal barrier coating systems[J].NDTE International,2012,45:71~78.
[4]Moskal G,Swadzba L,Hetmanczky M,et al.Characterization of microstructure and thermal properties of Gd2Zr2O7-type thermal barrier coating[J].Journal of the European Ceramic Society,2012,32:2 025~2 034.
[5]Song Z H,Ge C X,Gang L,et al.Influence of Gd2O3addition on thermophysical properties of La2Ce2O7ceramics for thermal barrier coatings[J].Journal of the European Ceramic Society,2012,32:3 693~3 700.
[6]Song Z H,Yuan W,Gang L,et al.Investigation about thermal conductivities of La2Ce2O7doped with calcium or magnesium for thermal barrier coatings[J].Journal of Alloys and Compounds,2012,537:141~146.
[7]Chen X L,Zhao Y,Fan X Z,et al.Thermal cycling failure of new LaMgAl11O19/YSZ double ceramic top coat thermal barrier coating systems[J].Surface and Coatings Technology,2011,205:3 293~3 300.
[8]Xu Z H,He L M,Mu R D,et al.Double-ceramic-layer thermal barrier coatings based on La2Zr2/YSZ deposited by electron beam-physical vapor deposition[J].Journal of Alloys and Compounds,2009,473:509~515.
[9]Xu Z H,He L M,Mu R D,et al.Thermal cycling behavior of YSZ and La2(Zr0.7Ce0.3)2O7as double-ceramiclayer systems EB-PVD TBCs[J].Journal of Alloys and Compounds,2012,525:87~96.
[10]Wang L,Wang Y,Sun X G,et al.Thermal shock behavior of 8YSZ and double-ceramic-layer La2Zr2O7/8YSZ thermal barrier coatings fabricated by atmospheric plasma spraying[J].Ceramics International,2012,38:3 595~3 606.
[11]Ma W,Dong H Y,Guo H B,et al.Thermal cycling behavior of La2Ce2O7/8YSZ double-ceramic-layer thermal barrier coatings prepared by atmospheric plasma spraying[J].Surface and Coatings Technology,2010,204:3 366~3 370.
[12]Ma W,Gong S K,Li H F,et al.Novel thermal barrier coatings based on La2Ce2O7/8YSZ double-ceramic-layer systems deposited by electron beam physical vapor deposition[J].Surface and Coatings Technology,2008,202:2 704~2 708.
[13]张红松,王富耻,马壮,等.等离子喷涂ZrO2热障的热冲击性能[J].机械工程材料,2007(1):86~89.
[14]Lee P H,Lee S Y,Kwon J Y,et al.Thermal cycling behavior and interfacial stability in thick thermal barrier coatings[J].Surface and Coatings Technology,2010,205:1 250~1 255.
[15]陈晓鸽,杨树森,张红松,等.大气等离子喷涂ZrO2与Sm2Zr2O7热障涂层的残余热应力分析[J].铸造技术,2009(9):1 148~1 152.
[16]张红松,时蕾.表面层厚度对Sm2Zr2O7/8YSZ热障涂层热冲击性能的影响[J].中国表面工程,2013(4):37~42.
[17]马壮,王全胜,王富耻,等.涂层基体条件对梯度涂层残余热应力的影响研究[J].材料工程,2002(4):15~19.
[18]Khor K Z,Gu Y W.Effects of residual stress on the performance of plasma sprayed functional graded ZrO2/NiCoCrAlY coatings[J].Materials Science and Engineering,2000,A277:64~76.
[19]Wang L,Wang Y,Zhang W Q,et al.Finite element simulation of stress distribution and development in 8YSZ and double-ceramic-layer La2Zr2O7/8YSZ thermal barrier coatings during thermal shock[J].Applied Surface Science,2012,258:3 540~3 551.
[20]Wang L,Wang Y,Sun X G,et al.Finite element simulation of residual stress of double-ceramic-layer La2Zr2O7/8YSZ thermal barrier coatings using birth and death element technique[J].Computational Materials Science,2012,53:117~127.