1、Y8‘2‘80分類號：盟一UDC：密級：籃一五位代礎(chǔ)：10424學(xué)位論文基于正交實(shí)驗(yàn)的超音速火焰噴涂Fe基涂層組織性能的研究王翠玲#請學(xué)位級別：亟堂位裁峪稱：撾抖堂指導(dǎo)教師姓轢一昱玉蓮職稱：熬握山東科技大學(xué)二零零五年五月些塞型絲犬蘭塑主竺堡堡塞塑壅ABSTRACTInthispaperFebasedalloycoatingvcaspreparedbyHVOFTherearemanyfactorsthataffecttheproperti

2、esofthecoating，amongwhichkeroseneoilflowrate，oxygenflowrateandstandoffwerethemainfactorsOrthogonaltestwascarriedoutbasedonthethreemainfactorswiththreelevelsOrthogonalanalysiswasappliedinwhichmicrohardness，porosity，metall

3、urgicalstructureandcombinationpropertywe[etakenastheobjectsThentheoptimizedparametersweregot、Vhenoxygenflowratewas944L／min，keroseneoilflowrateWas28L／handstandoffwas330mmthecoatinghadthebestpropertiesMorphologyandphasecom

4、positionofthecoatingWereattentivelystudiedbymeansofmetallographicmicroscopyscanningelectronmicroscopy(SEM)，transmissionelectronmicroscope(TEM)andXraydiffraction(XRD)ThestudyshowedthatthecoatingWascomposedofdeformedstrips

5、hapedparticles，anmeltedparticlesandsomeporesAlso，SEMWasusedtostudytheatomdiffusionalonginterfaceItWasfoundthatthesubstrateandthecoatingwerewellbondedItWasmainlymechanicalbondingandpartlymetallurgicalbondingAmorphousWasfo

6、rmedinthecoatingbecauseofhighcoolingrateofsprayingparticlesPartofamorphoustransformedintonanocrystallinebecauseoftheheatofthefollowinglayerThecoatingWascomposedofamorphous，llano—crystallineandborideThemechanicsofformatio

7、nofamorphousandnano—crystallineWasanalyzedaswellaSthereasonleadingtotheporesForoptimizedparametercoating，microhardnessofthecoatingWasfourtimesthatofthesubstrateandthemicrohardnessparalleltOthebindingsiteWasnearlythesamea

8、sthatverticaltothebingdingsiteMicro—hardnessofthesubstrateneal“thecoatingWasalittlehigherthanthatfarfromcoatinglayerItWasduetotheworkhardeningandtheformationofthetwincrystalsaswellaspartofmetallurgicalbondingThecorrosion

9、resistanceofcoatingandsubstratewascheckedbysaltspraytestThecorrosiontypeforthecoatingWaspittingcorrosionThecorrosionresistanceofthecoating、vithoptimizedparametersWasbetterthanbomsubstrateandcoatingwithhigherporosityAllth