Thermal shock resistance of Al2O3 and Al2O3-13%TiO2 coatings deposited by supersonic atmospheric plasma spraying
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摘要: 采用超音速等离子喷涂工艺在不锈钢基体上制备了FeAl/Al2O3、FeCrAl/Al2O3、FeAl/Al2O3-13%TiO2、FeCrAl/Al2O3-13%TiO2四种涂层,通过扫描电镜表征微观结构,图像分析技术测量孔隙率,多峰法计算α-Al2O3质量分数,并测试了涂层的抗热震性能和结合强度。结果表明:超音速等离子喷涂制备的Al2O3涂层中α-Al2O3的质量分数约为40.3%~42.5%,涂层孔隙率约为3.47%~3.52%,制备的Al2O3-13%TiO2涂层中α-Al2O3的质量分数约为24.0%~29.7%,涂层孔隙率约为3.12%~3.31%。水淬热震实验(800 ℃/保温30 min)表明,FeCrAl/Al2O3涂层的抗热震性能最优,FeCrAl/Al2O3-13%TiO2涂层抗热震性能次之,FeAl/Al2O3涂层与FeAl/Al2O3-13%TiO2涂层抗热震性能最差。Abstract: The thermal shock resistance of FeAl/Al2O3, FeCrAl/Al2O3, FeAl/Al2O3-13%TiO2, and FeCrAl/Al2O3-13%TiO2 coatings deposited by supersonic atmospheric plasma spraying (SAPS) on the stainless steel matrix was investigated in this paper. The microstructure of the coatings was characterized by scanning electron microscope, the porosity was measured by image analysis, the mass fraction of α-Al2O3 was calculated by multi peak method, and the bonding strength was tested. The results show that, the mass fraction of α-Al2O3 in Al2O3 coating is 40.3%~42.5%, the porosity is 3.47%~3.52%; the mass fraction of α-Al2O3 in Al2O3-13%TiO2 coating is about 24.0%~29.7%, the porosity is 3.12%~3.31%. The results of water-quenching tests at 800 ℃ for 30 min show that, the FeCrAl/Al2O3 coating presents the highest thermal shock resistance, and the FeCrAl/Al2O3-13%TiO2 coating takes the second place. The FeAl/Al2O3 and FeAl/Al2O3-13%TiO2 coatings exhibite the same thermal shock resistance, which are the worst in four kinds of coatings.
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Key words:
- supersonic atmospheric plasma spraying /
- hermal shock resistance /
- coatings /
- Al2O3 /
- FeAl /
- FeCrAl
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表 1 涂层喷涂参数
Table 1. Spraying parameters for the coatings
涂层 电流 / A 电压 / V 氩气流量 / (L·min−1) 氢气流量 / (L·min−1) 喷涂距离 / mm 粒子温度 / ℃ 粒子速度 / (m·s−1) Al2O3 312 133 65.2 16.7 90 3250.70±2.18 399.72±1.11 FeAl 380 120 70.0 20.4 90 — — Al2O3-13%TiO2 366 131 65.0 15.4 90 3242.03±2.49 387.91±2.05 FeCrAl 380 130 65.0 12.4 100 — — 表 2 涂层喷涂参数
Table 2. Spraying parameters for the coatings
样品 衍射强度(计次) α-A12O3质量分数 / % (012) (104) (110) (113) (116) 纯α-A12O3 2443 3519 1460 3607 2912 — FeAl/Al2O3 878 1039 1262 956 946 42.5 FeCrAl/Al2O3 700 1231 1376 1014 456 40.3 FeAl/Al2O3-13%TiO2 695 548 670 456 505 24.0 FeCrAl/Al2O3-13%TiO2 787 704 810 671 648 29.7 -
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