High speed laser cladded Ti-Cu-NiCoCrAlTaY burn resistant coating and its oxidation behavior

To improve the high temperature oxidation resistance and burn resistance performance of titanium alloy, Ti-Cu-NiCoCrAlTaY composite coating was designed and deposited on TC4 alloy using a novel high speed laser cladding technology. The chemical composition, constituent phases, microstructure and mor...

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Bibliographic Details
Published in:Surface & coatings technology 2020-06, Vol.392, p.1-13, Article 125697
Main Authors: Li-Yan, Lou, Yu, Zhang, Yun-Jie, Jia, Yan, Li, Hong-Fang, Tian, Yu-Jun, Cai, Cheng-Xin, Li
Format: Article
Language:English
Subjects:
Burn resistance
Chemical composition
Coating
Composite materials
Copper
Fire resistance
Flame retardants
High speed
High temperature
Laminates
Laser beam cladding
Laser cladding
Lasers
Morphology
Multilayers
Oxidation
Oxidation behavior
Oxidation resistance
Scale (corrosion)
Substrates
TGO
Thermal conductivity
Titanium alloys
Titanium base alloys
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Summary:To improve the high temperature oxidation resistance and burn resistance performance of titanium alloy, Ti-Cu-NiCoCrAlTaY composite coating was designed and deposited on TC4 alloy using a novel high speed laser cladding technology. The chemical composition, constituent phases, microstructure and morphology of the coating were characterized by EDS, XRD, SEM and 3D laser microscope respectively. The oxidation behavior of laser-cladded Ti-Cu-NiCoCrAlTaY coating and TC4 titanium alloy was analyzed at 800 °C. It was found that the functional coating has good oxidation performance attributed to the formation of dense double layered composite oxide scales. The flame-retardant functions of TC4 substrate and Ti-Cu-NiCoCrAlTaY coating were evaluated through laser spot melting test. The high thermal conductivity of copper and high anti-oxidation of NiCoCrAlTaY promote the flame retardant performance. The formation of TiCu eutectic transition zone in front of the substrate also helps to delay the combustion process. •Ti-Cu-NiCoCrAlTaY gradient burn resistant coating over TC4 substrate was proposed.•The coating with the thickness of 170 μm and Ra about 12 μm was deposited by novel HSLC.•Oxidation behavior of laser cladded coating was compared with sprayed one.•Great heat dissipation rate and TiCu eutectic zone promoted flame-retardant property.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2020.125697