Chemical solution deposition (CSD) methods involving the thermal decomposition of 5.0 M Er(NO₃)₃·5H₂O and Y(NO₃)₃·6H₂O precursor solutions were employed to fabricate protective erbia and yttria coatings onto stainless steel (SS304/SS316) coupons. The two techniques tested were dip and spray coating, which were then compared to a commercial yttria spray (ZYP Coatings). It was determined that solution concentration, solvent choice, injection of Er₂O₃ and Y₂O₃ micropowder, and the annealing temperature/ramp profile were critical to the coatings’ physical properties. For dip coatings, thicknesses were 1–20 μm after two dipping/annealing cycles, and adhesion strength was ∼1000 psi, increasing up to ∼1300 psi if the SS coupons had preliminary sandblasting. Spray coatings from precursor solutions were reported to have thicknesses of 20–80 μm and adhesion strength less than 500 psi (regardless of the coupon surface finish). Cross-sectional views of the coatings confirmed subsurface porosity, and XRD results indicated that the coatings were polycrystalline, with patterns typical to that of cubic Er₂O₃ and Y₂O₃.

中文翻译：

---

使用金属硝酸盐前体在不锈钢上化学溶液沉积保护性 Er2O3 和 Y2O3 涂层以进行熔融金属铸造

_{采用涉及 5.0 M Er(NO 3} ) ₃ ·5H ₂ O 和 Y(NO ₃ ) ₃ ·6H ₂ O 前体溶液热分解的化学溶液沉积 (CSD) 方法在不锈钢上制备保护性氧化铒和氧化钇涂层 ( SS304/SS316) 优惠券。测试的两种技术是浸涂和喷涂，然后将其与商用氧化钇喷涂 (ZYP Coatings) 进行比较。确定了溶液浓度、溶剂选择、Er ₂ O ₃和Y ₂ O _3的注入微粉和退火温度/升温曲线对涂层的物理性能至关重要。对于浸渍涂层，两次浸渍/退火循环后厚度为 1-20 μm，附着强度为 ~1000 psi，如果 SS 试样进行了初步喷砂处理，则增加到 ~1300 psi。据报道，前体溶液的喷涂层厚度为 20-80 μm，附着强度小于 500 psi（无论试样表面光洁度如何）。涂层的横截面图证实了表面下的孔隙率，XRD 结果表明涂层是多晶的，具有立方 Er 2 O 3_和Y ₂ O ₃的_典型图案。