Lub thermal spray electrode yog lub hauv paus tseem ceeb hauv cov khoom siv tshuaj tsuag thermal, lub luag haujlwm rau kev hloov hluav taws xob thiab kev ua kom nrawm. Its structural design directly determines the stability of the electric arc or plasma arc, the energy density distribution, and the repeatability of the spraying process. Hauv cov txheej txheem thermal txau sib txawv, cov electrode lub geometry, cov khoom muaj pes tsawg leeg, thiab cov txheej txheem txias sib txawv heev. Lub tshuab hluav taws xob tsim hluav taws xob tsis yog tsuas yog txhim kho cov khoom siv hluav taws xob zoo xwb tab sis kuj tseem txuas ntxiv nws lub neej kev pab cuam, ua kom ruaj khov thiab tswj tau txheej txheej zoo.
Los ntawm cov qauv tsim qauv, lub thermal spray electrode feem ntau muaj cathode thiab anode. Ob qhov no yog teem rau hauv ib qho kev sib raug zoo nyob rau hauv cov tshuaj tsuag phom, tsim ib lub voj kaw uas txwv thiab tuav lub siab - kub, siab - lub zog beam. Nyob rau hauv arc txau tshuab, cov cathode feem ntau yog ua los ntawm cov hlau refractory xws li tungsten, molybdenum, los yog tungsten alloys, zoo li tus pas nrig los yog koob los muab lub siab melting point thiab tsis tshua muaj kev ua haujlwm, kom ntseeg tau tias tsis kam mus rau ablation ntawm kub ntawm ntau txhiab degrees Celsius. Lub anode feem ntau yog ua los ntawm tooj liab lossis tooj liab alloy, siv nws cov thermal conductivity thiab machinability kom sai sai dissipate tshav kub thiab tswj cov duab stability. Qhov kev ncua deb ntawm ob lub electrodes, lawv txoj kab uas hla piv, thiab lawv qhov kawg profiles yog precisely tsim los tswj lub arc ntev thiab hluav taws xob tis, yog li tau txais ib tug concentrated thiab uniform arc kem. Qhov no tso cai rau cov hlau txau kom tag nrho yaj hauv thaj chaw arc thiab raug tshem tawm los ntawm cov roj atomized.
Nyob rau hauv plasma txau tshuab, cov qauv electrode yog complex, feem ntau muaj xws li ib tug central cathode, ib tug annular los yog cylindrical anode, thiab ib tug constrained nozzle. Lub cathode feem ntau yog ua los ntawm tungsten lossis tungsten- tsis tshua muaj lub ntiaj teb alloy, thiab nws qhov kawg tuaj yeem ua rau hauv lub khob taw qhia lossis cov duab tiaj tus los pab txhawb siab -frequency arc ignition thiab ruaj khov arc anchoring. Lub anode feem ntau yog ua los ntawm tooj liab, nrog nws sab hauv phab ntsa coaxial nrog lub cathode, thiab ib qho kev sib txuas los yog ncaj nraim - los ntawm lub nozzle yog tsim ntawm lub qhov hluav taws xob kom compress lub plasma dav hlau thiab ua kom cov nplaim hluav taws xob nce. Cov roj ua haujlwm tau qhia los ntawm qhov nruab nrab ntawm lub nozzle, ionized los ntawm arc nruab nrab ntawm cov electrodes los ua ib qho siab -plasma kub. Nws qhov kub thiab qhov kev faib tawm yog cuam tshuam los ntawm qhov sib txawv ntawm electrode, qhov loj me, thiab cov pa roj nkag. Txhawm rau tiv thaiv electrode overheating, dej- cov cua txias lossis cua- cov tsho txias feem ntau muab tso rau hauv cov qauv kom tshem tawm cov cua sov sai thiab tiv thaiv cov khoom muag los yog ablation.
Geometric tsim ntawm electrodes yuav tsum xav txog ob qho tib si thermodynamic thiab hydrodynamic yuav tsum tau. Txoj kab uas hla thiab qhov kawg ntawm lub voj voog ntawm curvature ntawm lub arc - cov tshuaj tsuag electrode cuam tshuam rau cov hluav taws xob xa hluav taws xob thiab arc hauv paus txoj hauj lwm; me me dhau ntawm txoj kab uas hla tuaj yeem ua rau muaj cua sov hauv cheeb tsam, thaum loj ib txoj kab uas hla txo lub zog ceev. Lub convergence lub kaum sab xis thiab caj pas ntev ntawm cov ntshav plasma- cov tshuaj tsuag electrode cuam tshuam rau compressibility thiab tshaj tawm ntawm cov plasma lub sij hawm ntws, yog li cuam tshuam rau cov qib melting thiab deposition kinetic zog ntawm cov tshuaj tsuag. Daim ntawv ntawm cov qauv cua txias kuj tseem ceeb heev; kauv raws, microchannels, los yog ntxeem tau dav hlau cua txias tuaj yeem txhim kho cov cua sov hloov pauv hauv qhov chaw txwv thaum tswj xyuas tag nrho lub zog thiab kev sib khi ntawm cov electrode.
Kev xaiv cov khoom siv thiab kev kho saum npoo yog qhov tseem ceeb rau kev ntseeg tau ntawm cov qauv. Electrode cov ntaub ntawv yuav tsum muaj cov ntsiab lus siab melting, zoo hluav taws xob thiab thermal conductivity, tsis kam mus rau arc yaig, thiab tshuaj inertness. Qee qhov siab -kawg electrodes muaj kev tiv thaiv-oxidation lossis tiv thaiv-ablation txheej siv rau lawv qhov chaw, xws li alumina, zirconium oxide, lossis cov yeeb yaj kiab uas tsis tshua muaj hauv ntiaj teb oxide, txhawm rau txo qhov poob qis ntawm qhov kub thiab txias thiab ruaj khov arc cwj pwm. Nyob rau hauv cov nqe lus ntawm machining precision, lub coaxiality, kawg -lub ntsej muag flatness, thiab nto tiav ntawm cov electrodes yuav tsum nruj me ntsis tswj. Txhua qhov eccentricity lossis roughness yuav ua rau arc tshuab, lub zog hloov pauv, thiab nplaim taws asymmetry, ua rau txheej txheej tsis xws luag.
Cov qauv sib dhos thiab kev sib txuas kuj tseem cuam tshuam rau kev ua haujlwm ntawm electrode. Electrodes thiab rab phom lub cev yog feem ntau txuas nrog threads, flanges, los yog compression fittings, thiab yog nruab nrog insulating ceramics los yog siab - kub seals los cais cov hluav taws xob thiab cua txias circuits, tiv thaiv luv luv circuits thiab xau. Cov yeeb nkab txias sib txuas yuav tsum ua kom ntseeg tau tias kev sib khi zoo thiab hloov tau rau thermal expansion thiab contraction los tiv thaiv kev sib txuas tsis ua hauj lwm vim thermal stress los yog coolant seepage rau hauv arc cheeb tsam.
Zuag qhia tag nrho, lub thermal spraying electrode qauv yog ib qhov system engineering project uas muaj kev ua haujlwm -kev xaiv cov khoom siv, geometric optimization, cua txias tsim, thiab sib dhos schemes. Nws cov txheej txheem rationality tsis tsuas yog txiav txim siab qhov zoo ntawm cov khoom siv hluav taws xob thiab kev saib xyuas, tab sis tseem cuam tshuam ncaj qha rau kev ruaj ntseg ntawm cov txheej txheem txau, lub zog efficiency piv, thiab txheej txheej. With the increasing demand for high heat flux density and long lifespan, electrode structures are developing towards refinement, integration, and intelligence, providing stronger hardware support for the widespread application of advanced thermal spraying technology.
