Influence of milling time on the microstructure evolution and oxidation behavior of NiCrAlY coatings by laser induction hybrid cladding

Influence of milling time on the microstructure evolution and oxidation behavior of NiCrAlY coatings by laser induction hybrid cladding
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铣削时间对激光感应混合熔覆NiCrAlY涂层组织演变和氧化行为的影响

DOI:
10.1016/j.corsci.2015.11.011
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发表时间:
2016-02
期刊:
影响因子:
8.3
通讯作者:
Chunxia Wang
Chunxia Wang
中科院分区:
材料科学1区
文献类型:
--
作者:
Jianbo Lei;Xiaoqin Dai;Tianyou Zhang;Chunxia Wang

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研究了球磨时间对激光感应复合熔覆NiCrAlY涂层组织演变和氧化行为的影响。机械球磨诱导NiCrAlY粉末中的Ni 3Al形成。随着研磨时间的延长,NiCrAlY涂层经历了等轴向柱状过渡,其成分变得均匀。此外,α-Al 2 O3、Cr2 O3和NiCr 2 O 4衍射峰的相对强度降低,NiCrAlY涂层的抗氧化性能提高。因此,球磨时间是控制NiCrAlY涂层中柱状生长的另一个关键参数,其氧化动力学取决于晶界和晶格扩散。
The influence of milling time on the microstructure evolution and oxidation behavior of NiCrAlY coatings generated by laser induction hybrid cladding was investigated. Mechanical milling induced γ’-Ni3Al formation in the NiCrAlY powder. With longer milling times, the NiCrAlY coatings experienced an equiaxed-to-columnar transition, and their compositions became homogenized. Furthermore, the relative intensities of the diffraction peaks of α-Al2O3, Cr2O3and NiCr2O4decreased and the oxidation resistance of the NiCrAlY coatings improved. Therefore, milling time is another critical parameter for the control of the columnar growth in NiCrAlY coatings, whose oxidation kinetics depend on both the grain boundaries and lattice diffusion.
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