Effect of Spraying Parameters on the Microstructure and Mechanical Properties of Micro-Plasma Sprayed Alumina-Titania Coatings-中国期刊网

摘要 Electricalpropertyofamicro-plasmaspraysystemwithdifferentworking-gasfeedingschemeswastestedtooptimizetheplasmasprayprocess.Thearcvoltagewithanintegratedgasinjectionmodeishigherthanthatwithradialinjectionoraxialinjectionmodes.Thus,anintegratedgasinjectionmodewithanexcellentelectricalcharacteristicwasadoptedtodepositalumina-titaniacoating.Themicrostructure,bondingstrengthandhardnessoftheplasmasprayedalumina-titaniacoating,asafunctionofthesprayingparameters,e.g.,plasmacurrent,gasflowrateandgaspressure,werestudied.Itwasshownthatthesprayingparametersaffectedremarkablyontheinicrostructureofthecoating.Differenttendenciesinbondingstrengthandhardnesswerealsoshownfordifferentsprayingparameters.Atanarccurrentof250A,agasflowrateof20L/rninandagaspressureof0.5MPa,thebondingstrengthandmicro-hardnessofthecoatingsreach40.6MPaandHV1406.1,respectively.

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Effect of Spraying Parameters on the Microstructure and Mechanical Properties of Micro-Plasma Sprayed Alumina-Titania Coatings

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Effect of Spraying Parameters on the Microstructure and Mechanical Properties of Micro-Plasma Sprayed Alumina-Titania Coatings

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