Thanks to their low density, high specific strength, excellent biocompatibility, and weather resistance,titanium alloystau dhau los ua cov ntaub ntawv tseem ceeb hauv kev ua haujlwm xws li aerospace, cov cuab yeej siv tub rog, cov cuab yeej kho mob, thiab siab -kawg pej xeem kev tsim khoom. Txawm li cas los xij, titanium alloys muaj qhov tsis zoo, suav nrog qhov tsis tshua muaj qhov tawv tawv, tsis muaj kev hnav tsis txaus, thiab muaj kev cuam tshuam rau galvanic corrosion, uas txwv tsis pub lawv siv nyob rau hauv hnyav loads, kev sib txhuam, seawater corrosion, thiab complex kev khiav hauj lwm tej yam kev mob, yog li txwv lawv cov kev siv dav siv.
Txhawm rau daws cov teeb meem no hauv cov khoom nto ntawm titanium alloys, kev lag luam dav siv cov txheej txheem hloov kho saum npoo los txhim kho lawv cov kev pabcuam tag nrho. Among these, micro-arc oxidation (MAO)-a novel plasma-electrochemical surface treatment technology-can in situ generate a dense ceramic oxide film on the surface of the titanium alloy substrate, significantly improving the material's wear resistance, corrosion resistance, thermal insulation, and electrical insulation properties. Tam sim no nws yog lub ntsiab thev naus laus zis mus kom ze rau siab -kawg nto ntxiv dag zog ntawm titanium alloys. Daim ntawv no hais txog cov hauv paus ntsiab lus ntawm micro-arc oxidation technology, nws cov txheej txheem zoo, cov txheej txheem ntawm kev tswj xyuas kev ua tau zoo, kev tshawb fawb tsis ntev los no, thiab nws txoj kev cia siab rau kev lag luam.
I. Cov Ntsiab Cai thiab Qhov Zoo Tseem Ceeb ntawm Micro-Arc Oxidation Technology
Micro-arc oxidation yog lub siab- lub zog hloov kho tshuab tsim los ntawm cov pa anodizing. Cov txheej txheem no txuas ntxiv cov hluav taws xob oxidation ntau rau hauv qhov siab -voltage paug ntau yam, ua rau muaj ntau yam kev hloov pauv ntawm lub cev hloov pauv- xws li cov hluav taws xob tawm, micro-arc tawg, thiab cov ntshav ntshav- tshwm sim hauv valve hlau workpieces (xws li titanium, aluminium, thiab magnesium.) Through the coupled effects of electrochemistry, thermochemistry, and plasma chemistry, a dense, high-hardness ceramic oxide film that is metallurgically bonded to the substrate grows in situ on the metal surface, achieving comprehensive strengthening of the material's surface properties.
(I) Plaub-Stage Film Formation Mechanism of Micro-Arc Oxidation Lub micro-arc oxidation zaj duab xis tsim txheej txheem rau titanium alloys tuaj yeem muab faib ua plaub theem sib law liag, txhua tus muaj cov yam ntxwv sib txawv thiab cov txheej txheem tsim cov yeeb yaj kiab kom meej meej:
Kauj Ruam 1: Ua ntej-Spark Phase. Thaum pib ntawm daim ntawv thov tam sim no, cov pa ntau ntawm cov pa tawm ntawm qhov chaw ua haujlwm, tsim cov roj foob txheej, thiab cov ntaub ntawv insulating passivation tsis sib xws sai sai rau ntawm qhov chaw. The current density rapidly rises to a peak before declining, laying the foundation for the subsequent breakdown reaction.
Theem 2: Spark Discharge Stage. Raws li qhov hluav taws xob txuas ntxiv nce ntxiv, cov chaw tsis muaj zog ntawm cov zaj duab xis saum npoo av yog thawj zaug tawg los ntawm qhov hluav taws xob siab, tsim cov plasma tawm channel ntawm cov electrodes. Ntau qhov me me, wandering sparks tshwm rau ntawm qhov chaw ua haujlwm. Cov ntsiab lus tawg hloov pauv dynamically thiab randomly, ua rau thawj zaug zoo li zaj duab xis loj hlob.
Theem 3: Micro-arc Reaction Stage Raws li cov tshuaj tiv thaiv txuas ntxiv mus, cov nplaim tawg maj mam coalesce rau hauv micro-arcs; Qhov kev tawm dag zog nce ntxiv, tus naj npawb ntawm arcs txo qis, thiab lawv lub zog nrawm. Cov zaj duab xis thickness thiab nto kuj tseem nce ntxiv, qhov tam sim no ceev stabilizes, thiab cov qauv tseem ceeb ntawm cov ceramic zaj duab xis sai npaum li cas. Theem 4: Localized Arc Theem. Nyob rau theem kawg ntawm cov tshuaj tiv thaiv, tus naj npawb ntawm qhov chaw arc qhov chaw txo qis, lawv lub zog qeeb, tawm lub zog ua kom muaj zog dua, thiab qhov ceev tam sim no txo qis dua. Lub workpiece nto undergoes complex txheej txheem xws li plasma bombardment, melting thiab diffusion, siab -kub sintering, thiab solidification theem hloov, thaum kawg tsim ib tug ceramic oxide txheej nrog loj thickness, siab ceev, thiab tsis tshua muaj zog adhesion.
(II) Cov txiaj ntsig zoo ntawm Micro-Arc Oxidation Technology
1. Exceptionally Strong Adhesion: Cov txheej ceramic loj hlob nyob rau hauv qhov chaw ntawm lub substrate, tshem tawm cov kev pheej hmoo ntawm tev lossis delamination; nws adhesion deb tshaj li cov txheej txheem ib txwm xws li txau thiab electroplating.
2. Customizable Coating Properties: Los ntawm kev kho cov electrolyte formulation, hluav taws xob tsis, thiab txheej txheem ntev, txheej txheej thickness, ntom, hardness, thiab corrosion kuj yuav precisely tswj kom ua tau customized functionality.
3. Tsis muaj kev puas tsuaj rau lub substrate: Qhov kub tam sim ntawd hauv micro- arc tawm tsam tuaj yeem ncav cuag 2,000℃. Qhov kub hauv zos kub ua rau cov theem ceramic rau sinter, tab sis tag nrho cov workpiece kub tseem qis dua 300 degree, tiv thaiv substrate softening, deformation, thiab kev ua haujlwm degradation.
4. Muaj zog tag nrho - thaj tsam txheej muaj peev xwm: Tsis muaj kev txwv los ntawm cov qauv ua haujlwm, cov txheej txheem tsis sib xws tuaj yeem ua tiav ntawm qhov nyuaj, tsis xwm yeem zoo li qhov, cov kab noj hniav sab hauv, thiab cov ces kaum, tsis muaj qhov chaw tuag lossis cov txheej txheem omissions.
5. Yooj yim thiab Nqis - Txheej Txheem Ua Haujlwm: Tsis muaj qhov siab - qhov kub thiab lub tshuab nqus tsev yuav tsum tau; pretreatment cov kauj ruam yog yooj yim; cov txheej txheem ntws yog luv; kev siv zog yog tswj tau; thiab tus nqi - ua tau zoo heev.
6. Kev txhim kho tseem ceeb hauv kev ua tau zoo tag nrho: Los ntawm kev sib txuas lub zog ntawm cov hlau nrog lub siab hardness thiab corrosion kuj ntawm ceramics, cov txheej txheem ua kom cov titanium alloy tag nrho cov kev ua tau zoo, nrog rau hnav tsis kam, corrosion kuj, thermal rwb thaiv tsev, thiab hluav taws xob rwb thaiv tsev.
Leveraging nws ntau yam kev ua tau zoo-xws li hnav tsis kam, corrosion kuj, thermal rwb thaiv tsev, hluav taws xob rwb thaiv tsev, thiab biocompatibility-titanium alloy MAO hloov kho tshuab tau pom dav daim ntawv thov kev cia siab nyob rau hauv ntau yam teb thiab scenarios. Nyob rau hauv marine engineering sector, tuab TiO₂ ceramic txheej tuaj yeem tiv taus cov dej hiav txwv ntsev ntsev thiab galvanic corrosion, ua rau lawv tsim nyog rau cov qauv txheej txheem ntawm cov nkoj, cov yeeb nkab fittings, thiab precision qhov chaw ntawm cov khoom siv hauv hiav txwv, yog li txhim kho cov cuab yeej tiv thaiv kev laus hauv marine ib puag ncig. Hauv cov khoom siv hauv tsheb thiab kev lag luam, MAO coatings muaj cov khoom siv thermal zoo heev, hais txog cov teeb meem ntawm tev thiab kub qhov sib txawv kuj muaj nyob rau hauv cov tsoos thermal rwb thaiv tsev txheej. Lawv tsim nyog rau siab - qhov kub thiab txias ntawm lub cav thiab qhov hnyav - lub luag haujlwm kev sib txhuam, txhim kho cov cuab yeej tiv thaiv qhov kub thiab txias, hnav, thiab ua rau lub neej ntev kev pab cuam. Hauv kev siv tshuab textile, siab -hardness, qis- kev sib txhuam ceramic coatings ho txhim kho qhov hnav tsis kam ntawm siab -cov khoom siv ceev. Lawv tsim nyog rau kev hnav tseem ceeb- cov khoom siv xws li siab - cov xov paj ceev thiab cov lus qhia kev sib txuas ntawm cov hlau, yog li txuas ntxiv cov khoom siv lub neej. Hauv cov khoom siv hluav taws xob thiab qib siab- cov khoom siv kawg, micro-arc oxidation coatings muab cov khoom siv hluav taws xob zoo heev, tiv thaiv hluav taws xob, thiab tiv thaiv siab - hluav taws xob hluav taws xob. Lawv tuaj yeem siv tau rau siab-kawg hluav taws xob tiv thaiv vaj huam sib luag thiab cov khoom tiv thaiv rau cov cuab yeej precision, ua rau lawv tsim nyog rau kev khiav hauj lwm huab cua xws li hluav taws xob, kub kub, kub ceev, thiab hluav taws xob hnyav. Hauv kev kho mob, biocompatibility- cov coatings hloov kho tuaj yeem siv rau ntawm cov ntaub ntawv cog lus orthopedic thiab cov cuab yeej kho mob titanium alloy, txhim kho corrosion kuj thiab biocompatibility, nrog rau kev kho mob zoo heev.
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