LaMeAl11O19/YSZ热障涂层热力学性能和热循环寿命

doi:10.15541/jim20220202

摘要/Abstract

摘要：

LaMeAl₁₁O₁₉陶瓷具有独特的晶体结构, 优异的热力学性能, 低热导率, 高温相稳定性等特点, 是一类非常有应用前景的热障涂层(TBC)材料。本研究通过大气等离子喷涂(APS)制备了LaMeAl₁₁O₁₉/YSZ (Me=Mg, Cu, Zn)双陶瓷层热障涂层。通过对涂层进行火焰热循环测试并结合扫描电子显微镜、X射线衍射仪等分析技术对涂层进行失效分析。结果表明, LaMgAl₁₁O₁₉ (LMA)、LaZnAl₁₁O₁₉ (LZA)和LaCuAl₁₁O₁₉ (LCA)粉末在等离子喷涂过程中发生了分解, 导致三种涂层中磁铅石相含量的差异, 从而影响三种涂层的热循环寿命。由于LaMeAl₁₁O₁₉层与YSZ层的热膨胀系数不匹配以及非晶相重结晶产生的体积收缩, LaMeAl₁₁O₁₉层从YSZ层上剥落。YSZ层暴露在高温下, 加速了烧结和TGO的生长, 又促进了YSZ层剥落。低温下, LaMeAl₁₁O₁₉的热导率随着Me原子序数增加而降低; 高温下, 与LMA和LZA相比, LCA涂层红外发射率最高(0.88, 600 ℃), 削弱了光子传导对热导率的贡献, 导致热导率降低, LCA在高温红外辐射涂层中具有潜在的应用价值。

关键词: 热障涂层, 磁铅石型稀土六铝酸盐, 火焰热循环, 热力学性能

Abstract:

LaMeAl₁₁O₁₉ ceramics is a kind of thermal barrier coating (TBC) material with promising application prospect due to its unique crystal structure, excellent thermodynamic properties, low thermal conductivity, and high temperature phase stability. Here, LaMeAl₁₁O₁₉/YSZ (Me=Mg, Cu, Zn) thermal barrier coatings were prepared by atmospheric plasma spraying (APS). Failure analysis of the coating was carried out by burner rig test and other analysis techniques. The results show that LaMgAl₁₁O₁₉ (LMA), LaZnAl₁₁O₁₉ (LZA) and LaCuAl₁₁O₁₉ (LCA) powders are decomposed during the plasma spraying, resulting in different contents of magnetoplumbite phase in the coatings, which may be an important factor responsible for their distinction of thermal cycling lifetimes. The LaMeAl₁₁O₁₉ layer is delaminated upon YSZ layer due to mismatch of thermal expansion coefficient between LaMeAl₁₁O₁₉ layer and YSZ layer and volume shrinkage caused by recrystallization of amorphous phase. Then the YSZ layer is exposed high temperature, accelerating sintering and TGO growth, and promoting the delamination of the YSZ layer from the bond coat. At low temperature, with the increase of the atomic number of the divalent Me²⁺, the thermal conductivity of the LaMeAl₁₁O₁₉ decreases. At high temperature, LCA coating has better infrared emissivity (0.88, 600 ℃) than both LMA and LZA, which weakens the contribution of photon conduction to thermal conductivity and leads to the reduction of thermal conductivity. Therefore, LCA coating has potential application in high temperature infrared radiation coating.

Key words: thermal barrier coating, magnetite rare earth hexaaluminate, flame thermal cycling, thermodynamic property

中图分类号:

TB306

蔚海浪, 曹学强, 邓龙辉, 蒋佳宁. LaMeAl₁₁O₁₉/YSZ热障涂层热力学性能和热循环寿命[J]. 无机材料学报, 2022, 37(12): 1259-1266.

WEI Hailang, CAO Xueqiang, DENG Longhui, JIANG Jianing. Thermodynamic Properties and Thermal Cycling Lifetimes of LaMeAl₁₁O₁₉/YSZ Thermal Barrier Coatings[J]. Journal of Inorganic Materials, 2022, 37(12): 1259-1266.

图/表 10

表1 主要实验用化学试剂

Table 1 Chemical reagents for main experiments

Chemical reagent	Purity	Manufacturer
La₂O₃	99.9%	Beijing Chemical Works
MgO	99.9%	Jiangsu Hanos Chemical Co., LTD
Al₂O₃	99.9%	Shanghai Chemetall Chemicals Co., LTD
ZnO	99.9%	Hubei Longma Chemical Co., LTD
CuO	99.9%	Nanjing Xincai Chemical Co., LTD
CaO	99.9%	Nanjing Xincai Chemical Co., LTD
Metallographic cold inlay	—	Wuxi Huazheng Metallurgical Technology Co., LTD
Gumacabic powder	AR	Shanghai Sinopharm Group Chemical Reagent Co. LTD
Ammonium citrate tribasic	AR	Beijing Chemical Works

表2 等离子喷涂的参数

Table 2 Parameters of APS

Item	Bonding layer	Ceramic layer
Spraying distance/mm	100	100
Power/kW	42	42
Current/A	530	530
Plasma gas/SLPM	32/12	32/12
Migration rate/(mm·s⁻¹)	1000	1000
Feed rate/(g·min⁻¹)	30	35

图1 三种涂层的XRD图谱

Fig. 1 XRD patterns of three kinds of coatings (a) As-sprayed; (b) After failure

图2 三种涂层的热膨胀曲线

Fig. 2 Thermal expansion curves of freestanding coatings (a) LMA; (b) LZA; (c) LCA

图3 不同温度下三种涂层的(a) 热导率和(b)3~5 μm单波段的红外发射率

Fig. 3 (a) Thermal conductivity and (b) single band (3-5 µm) infrared emissivity of freestanding coatings at different temperatures

图4 三种涂层的维氏硬度和断裂韧性

Fig. 4 Vickers hardness and fracture toughness of freestanding coatings

图5 热循环过程中涂层表面和金属基底的温度变化曲线

Fig. 5 Temperature changes of surface of coatings and metallic substrate during thermal cycling

图6 沉积态涂层截面和表面SEM照片

Fig. 6 SEM images of cross-sections and top surfaces of as-sprayed coatings (a, a°, b) LMA/YSZ; (c, c°, d) LZA/YSZ; (e, e°, f ) LCA/YSZ

图7 热循环失效后三种涂层在不同位置的截面SEM照片及其元素分布图

Fig. 7 SEM images of cross-sections and elemental mappings of failed coatings at different positions (a) LMA/YSZ at the center; (b) LMA/YSZ at the edge; (c) LZA/YSZ at the edge; (d) LZA/YSZ at the center; (e) LCA/YSZ at the edge; (f) LCA/YSZ at the center

图8 三种涂层的热循环寿命

Fig. 8 Thermal cycle life times of three kinds of coatings

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LaMeAl₁₁O₁₉/YSZ热障涂层热力学性能和热循环寿命

Thermodynamic Properties and Thermal Cycling Lifetimes of LaMeAl₁₁O₁₉/YSZ Thermal Barrier Coatings

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