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Study Of Ni-Cu Composite Coating By Laser Cladding On Aluminum Alloy

Posted on:2016-07-22Degree:MasterType:Thesis
Country:ChinaCandidate:Q LuFull Text:PDF
GTID:2181330467992368Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
Based on laser cladding technology, using Nd: YAG pulsed laser to preset the Ni-Cumixed powder of6061aluminum alloy substrate by laser surface cladding processing,expect in-situ generated aluminum nickel copper intermetallic compounds, so as to improvethe wear resistance and hardness of6061aluminum alloy surface.In order to achieve expected, this paper use orthogonal experiment with differentoverlap rate, different current, pulse width and different speed and different thickness of thepreset Ni-Cu mixed powder for laser cladding processing of aluminum alloy wereinvestigated and optimized process parameters, and the optimization of process parameterson the Ni-Cu mixed powder coating of the preset, and add CeO2, Si, Co, Ni-Cu mixedpowder coating of the preset laser cladding experiments. Using SEM, XRD, metallographicanalysis and other modern analysis methods of the different components of cladding layermicrostructure, phase and chemical composition were analyzed; Using microhardness metertest, microhardness of the cladding layer using the friction and wear testing machine to testthe wear properties of cladding layer.The experimental results show that under the optimized process parameters, the lasercladding Ni-Cu composite coating obtained with substrate with good metallurgycombination of cladding layer, by Al-Ni intermetallic compounds as dense microstructure;The average hardness of the cladding layer maximum480HV, more than four times thematrix; Abrasion resistance to1.937times that of the substrate. Under the optimized processparameters, adding CeO2, Si, Co and so on all has influence on the cladding layermicrostructure and refine them CeO2that organization, Si and Co hard particle phaseincreased; On hardness and wear properties of cladding layer were greatly improved, whichSi element effect is most obvious, the influence of adding Si element Ni-Cu cladding layer of average maximum1076HV hardness, nearly10times that of the matrix; Add Si elementrelative wear resistance of up to3.274times of aluminum substrate. The cladding layer ofwear are mainly composed of abrasive wear, matrix wear mainly adhesive wear.
Keywords/Search Tags:Laser cladding, Ni-Cu coating, The third phase element, Microhardness, Wearresistance
PDF Full Text Request
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