铜合金表面等离子喷涂 ZrO2-Y2O3和A12O3-TiO2涂层的抗高温氧化性能

目的对比研究ZrO2-Y2O3和A12O3-TiO2涂层的抗高温氧化性能。方法采用等离子喷涂工艺,以NiCrAl为粘接层,在铜合金基体表面分别制备ZrO2-Y2O3和A12O3-TiO2涂层,测试涂层的显微组织、元素种类及含量、显微硬度,并在相同条件下测试涂层的抗高温氧化性能。结果 ZrO2-Y2O3和A12O3-TiO2涂层都具有明显的层状结构,涂层结合紧密,内部孔洞细小,显微硬度分别为423HV和628HV。这两种涂层都具有一定的抗高温氧化性能,NiCrAl粘结层是整个涂层最薄弱的环节。结论等离子喷涂ZrO2-Y2O3涂层的抗高温氧化性能优于A12O3-TiO2涂层。

Study on Oxidation Resistance of ZrO2-Y2O3and A12O3-TiO2Coatings by Plasma Spraying on Copper Alloy

Objective In order to study the oxidation resistance of ZrO₂-Y₂O₃and A1₂O₃-TiO₂coatings, ZrO₂-Y₂O₃and A1₂O₃-TiO₂coatings with NiCrAl bonding layer were successfully prepared by plasma spraying process. Methods The microstructures, element types and levels and micro-hardness of the different coatings were studied by metallurgical microscopy, scanning electron microscopy ( SEM) , energy dispersive spectrometer ( EDS) and micro-hardness measurement. Oxidation resistance of all the specimens were tested under the same conditions. Results Both ZrO₂-Y₂O₃and A1₂O₃-TiO₂coatings had a significant layer structure, good adhesion and low porosity. The micro-hardness of ZrO₂-Y₂O₃and A1₂O₃-TiO₂coatings was 423HV and 628HV, respectively. Both ZrO₂-Y₂O₃and A1₂O₃-TiO₂coatings had certain oxidation resistance. NiCrAl bonding layer was the weakest part of the whole coatings. Conclusion ZrO₂-Y₂O₃coatings had better oxidation resistance than A1₂O₃-TiO₂coatings.