真空 ›› 2021, Vol. 58 ›› Issue (4): 12-20.doi: 10.13385/j.cnki.vacuum.2021.04.03
白明远, 王鑫, 甄真, 牟仁德, 何利民, 许振华
BAI Ming-yuan, WANG Xin, ZHEN Zhen, MU Ren-de, HE Li-min, XU Zhen-hua
摘要: 采用电子束物理气相沉积(EB-PVD)工艺制备了La2Zr2O7(LZ)、La2Zr2O7-3wt.%Y2O3(LZ3Y)、La2(Zr0.7Ce0.3)2O7(LZ7C3)和6~8wt.%Y2O3部分稳定化的ZrO2(YSZ)四种陶瓷涂层,研究了稀土锆酸盐和YSZ热障涂层的高温相稳定性、涂层结合性能和热循环行为。借助X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)等表征手段分析了涂层的相组成、相结构稳定性、显微组织和化学成分。试验结果表明:经过1300℃长时间热处理后,LZ、LZ3Y和LZ7C3涂层粉末的XRD衍射峰均逐渐向2θ大角度方向偏移,涂层中共存的La2O3、t-ZrO2和CeO2物相也产生了固溶现象,YSZ涂层则是出现了两个单斜相衍射峰且峰强度逐渐增大;在室温空气中放置336h后,LZ涂层出现了明显的片层状脱落现象;YSZ涂层的平均结合强度值最大,LZ涂层则是最小。同样,三种稀土锆酸盐涂层的热循环寿命均比YSZ涂层短。这可能与三种涂层中含有过量的La2O3有关,La2O3易于与空气中的H2O或CO2发生化学反应导致体积膨胀,从而削弱了陶瓷层与金属粘结层的界面结合性能,降低了陶瓷层的耐剥落寿命。
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[1] 孙健, 刘书彬, 李伟, 等. 电子束物理气相沉积制备热障涂层研究进展[J]. 装备环境工程, 2019, 16(1): 1-6. [2] ZHANG X F, ZHOU K S, LIU M, et al.CMAS corrosionand thermal cycle of Al-modified PS-PVD environmental barrier coating[J]. Ceram.Int., 2018, 44(13): 15959-15964. [3] ZHANG X F, ZHOU K S, LIU M, et al.Mechanisms governing the thermal shock and tensile fracture of PS-PVD 7YSZ TBC[J]. Ceram.Int., 2018, 44(4): 3973-3980. [4] SALDANA J M, SCHULZA U, RODRIGUZA G G M, et al. Microstructure and lifetime of Hf or Zr doped sputtered NiAlCr bond coat/7YSZ EB-PVD TBC systems[J]. Surf.Coat.Technol., 2018, 335: 41-51. [5] CAO XQ.Application of Rare earths in thermal barrier coating materials[J]. J.Mater.Sci.Thchnol., 2007, 23(1): 15-35. [6] 周雳, 邢志国, 王海斗, 等. 等离子喷涂金属/陶瓷梯度热障涂层研究进展[J].表面技术, 2020, 49(1): 122-131. [7] SHEN Z YHE L M, XU Z H, et al. LZC/YSZ DCL TBCs by EB-PVD: microstructure, low thermal conductivityand high thermal cycling life[J]. J.Eur.Ceram.Soc., 2019, 39(4): 1443-1450. [8] CAO XQ, VASSEN R, STÖVER D. Ceramic materials for thermal barrier coatings[J]. J.Eur.Ceram.Soc., 2004, 24(1): 1-10. [9] 薛召露, 郭洪波, 宫声凯, 等. 新型热障涂层陶瓷隔热层材料[J]. 航空材料学报, 2018, 38(2): 10-20. [10] SHEN Z YHE L M, XU Z H, et al. LZC/YSZ double layer coatings: EB-PVD,microstructure and thermal cyclinglife[J]. Surf.Coat.Technol., 2019, 367(15): 86-90. [11] ZHANG H, YUAN J Y, SONG W J, et al.Composition, mechanical properties and thermal cycling performance of YSZ toughened La2Ce2O7 composite thermal barrier coatings[J]. Ceram.Int., 2020, 46(5): 6641-6651. [12] WANG Y J, MA X X, MA R, et al.Influence of amorphous phase in LaMgAl11O19 properties of LaMgAl11O19/YSZ thermal barrier coatings[J]. Ceram.Int., 2020, 45(7): 6537-6546. [13] XU ZH, HE LM, ZHAO Y, et al.Composition, structure evolution and cyclic oxidation behavior of La2(Zr0.7Ce0.3)2O7 EB-PVD TBCs[J]. J.Alloys.Compd., 2010, 491(1-2): 729-736. [14] LI M H, SUN X F, GONG S K, et al.Phase transformation and bond coat oxidation behavior of EB-PVD thermal barrier coating[J]. Surf.Coat.Technol., 2004, 176(2): 209-214. [15] SCHULZ U, NOWOTNIK A, KUNKEL S, et al.Effect of processing and interface on the durability of single and bilayer7YSZ/gadolinium zirconate EB-PVD thermal barrier coatings[J]. Surf.Coat.Technol., 2020, 381: 125107-125117. [16] 闫洪, 窦明民, 李和平. 二氧化锆陶瓷的相变增韧机理和应用[J]. 陶瓷学报, 2000, 21(1): 46-50. [17] BRANDON J R, TAYLOR R.Phase stability of zirconia-based thermal barrier coatings partI: Zirconia-yttria alloys[J]. Surf.Coat.Technol., 1991, 46(1): 75-90. [18] SARUHAN B, FRANCOIS P, FRITSCHER K, et al.EB-PVD processing of pyrochlore-structured La2Zr2O7-based TBCs[J].Surf.Coat.Technol., 2004, 182(2-3): 175-183. [19] SARUHAN B, FRITSCHER K, SCHULZ U.Y-doped La2Zr2O7 pyrochlore EB-PVD thermal barrier coatings[J]. Ceram.Eng.Sci.Proc., 2003, 24: 491-496. [20] BOISSONNET G, CHALK G, NICHOLLS J R, et al.Phase stability and thermal insulation of YSZ and erbia-yttria co-dopedzirconia EB-PVD thermal barrier coating systems[J]. Surf.Coat.Technol., 2020, 389: 125566-125573. [21] XU Z H, HE L M, CHEN X L, et al.Thermal cycling behavior of La2Zr2O7 coating with the addition of Y2O3 by EB-PVD[J]. J.Alloys.Compd., 2010, 508: 85-93. [22] JESURAJ S A, KUPPUSAMI P, DHARINI T, et al.Effect of substrate temperature on microstructure and nanomechanical properties of Gd2Zr2O7 coatings prepared by EB-PVD technique[J].Ceram.Int., 2018, 44(15): 18164-18172. [23] JUNG Y C, SASAKI T, TOMIMATSU T, et al.Distribution and structures of nanoporesin YSZ-TBC deposited by EB-PVD[J]. Sci.Technol.Adv.Mater., 2003, 4(6): 571-574. [24] GUO X Y, LI L, PARK H M, et al.Mechanical properties of layered La2Zr2O7 thermal barrier coatings[J]. J.Therm.Spray.Tech., 2018, 27: 581-590. [25] FROMMHERZ M, SCHOLZ A, OECHSNER M, et al.Gadolinium zirconate/YSZ thermal barrier coatings: Mixed-modeinterfacial fracture toughness and sintering behavior[J]. Surf.Coat.Technol., 2016, 286: 119-128. |
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