材料期刊网

目的：对比研究ZrO2-Y2 O3和A12 O3-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-Y2 O3和A12 O3-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-Y2 O3和A12 O3-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-Y2 O3涂层的抗高温氧化性能优于A12 O3-TiO2涂层。

Objective In order to study the oxidation resistance of ZrO2-Y2 O3 and A12 O3-TiO2 coatings, ZrO2-Y2 O3 and A12 O3-TiO2 coatings with NiCrAl bonding layer were successfully prepared by plasma spraying process. Methods The microstruc-tures, element types and levels and micro-hardness of the different coatings were studied by metallurgical microscopy, scanning e-lectron 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-Y2 O3 and A12 O3-TiO2 coatings had a significant layer structure, good adhesion and low porosity. The micro-hardness of ZrO2-Y2 O3 and A12 O3-TiO2 coatings was 423HV and 628HV, respectively. Both ZrO2-Y2 O3 and A12 O3-TiO2 coatings had certain oxidation resistance. NiCrAl bonding layer was the weakest part of the whole coatings. Conclusion ZrO2-Y2 O3 coatings had better oxidation resistance than A12 O3-TiO2 coatings.