Cov kev kho saum npoo puas tuaj yeem txhim kho corrosion kuj ntawm cov hlau 3D luam ntawv?

Ib, Qhov tseem ceeb ntawm kev kho deg technology
Qhov chaw saum npoo muaj qhov cuam tshuam ncaj qha rau qhov zoo ntawm cov hlau 3D luam tawm cov khoom tiv thaiv corrosion. Deg roughness, me me flaws, thiab compositional segregation ua rau kom nkag mus rau corrosive tshuaj xws li chloride ions thiab acidic gasses. Ntawm qhov tod tes, txoj kev kho saum npoo ua rau cov ntaub ntawv tiv taus corrosion los ntawm kev ua cov hauv qab no:
Kev tshem tawm qhov tsis xws luag: tshem tawm qhov tsis zoo ntawm qhov chaw xws li cov hmoov tsis sib xws thiab cov kab sib tshooj ntawm lub pas dej molten, thiab ua rau nws nyuaj rau cov xov xwm corrosive los lo. Tshuaj polishing, piv txwv li, tuaj yeem tshem tawm ntawm 70 μm tuab nplaum txheej los ntawm kev xaiv cov txheej txheem deg. Qhov no zoo heev txo qhov muaj feem ntawm pitting corrosion.
Optimizing microstructure txhais tau hais tias hloov qhov loj ntawm cov nplej thiab tshem tawm cov khoom sib cais los ntawm kev siv cov kev kho cua sov los yog kev hloov kho saum npoo. Piv txwv li, kub isostatic nias (HIP) tuaj yeem ua rau cov khoom siv ntom ntom yuav luag 100%, tshem tawm cov pores sab hauv, thiab ua rau nws nyuaj rau corrosive media kom dhau mus.
Txhawm rau tiv thaiv cov hlau substrate los ntawm qhov nruab nrab corrosive, tsim kom muaj oxide zaj duab xis tuab, txheej txheej txheej, lossis txheej txheej ntawm qhov chaw. Piv txwv li, anodizing tuaj yeem tsim ib qho Al ₂ O3 txheej uas yog 5 mus rau 20 μ m tuab ntawm qhov chaw ntawm aluminium alloys. Qhov no ua rau lawv ntau resistant rau ntsev tsuag corrosion.
2, Txoj kev kho saum npoo feem ntau thiab nws yuav pab tiv thaiv corrosion li cas
1. buffing nrog tshuaj thiab buffing nrog hluav taws xob
Tshuaj polishing: siv cov tshuaj oxidizing acid uas muaj zog (xws li hydrochloric acid thiab nitric acid) los xaiv yaj cov pob ntawm qhov chaw, ua kom nws du ntawm qib -micron. Tom qab cov tshuaj polishing, qhov roughness ntawm 3D luam titanium alloy mus ntawm 6-12 μm mus rau 0.2-1 μm. Qhov tseem ceeb pitting kub (CPT) nyob rau hauv ib tug 3.5% NaCl tov nce mus txog 15 degree, uas ua rau nws ntau resistant rau pitting corrosion.
Electrochemical polishing: Siv cov txheej txheem electrolytic kom tau txais nanoscale smoothness thiab ua ib zaj duab xis passivation tib lub sijhawm. Piv txwv li, electrochemical polishing txo qhov roughness ntawm 316L stainless hlau los ntawm 8 μm mus rau 0.18 μm thiab tus nqi corrosion nyob rau hauv simulated lub cev kua los ntawm 90%, uas yog yam kev kho mob implants xav tau rau ntev - siv.
2. Hloov qhov chaw thiab cua sov
Kev kho cua sov yog cov txheej txheem ntawm kev tshem tawm ntawm qhov nro sab hauv thiab txhim kho cov qauv nplej. Annealing thiab quenching yog ob qho piv txwv ntawm qhov no. Piv txwv li, tom qab kev kho cua sov, oxidation tus nqi ntawm lub dav hlau cav turbine hniav ntawm kub poob los ntawm 50 degree, thiab lawv cov kev pab cuam lub neej nce mus txog 20%.
Nitriding los yog carburizing saum npoo: Muab cov nitrogen los yog carbon atoms rau saum npoo ntawm qhov kub thiab txias kom ua rau cov txheej txheem diffusion uas nyuaj heev thiab tiv taus corrosion. Piv txwv li, tom qab nitriding, lub hardness ntawm pwm hlau nto mus txog 1000-1200HV, thiab nws muaj peev xwm tiv taus ntsev tsuag corrosion rau ntau tshaj 1000 teev.
3. Tshuab rau txheej
Lub cev Vapor Deposition (PVD): Muab cov coatings muaj zog zoo li TiN thiab CrN ua kom cov khoom tiv taus hnav thiab corrosion. Piv txwv li, tom qab PVD txheej, oxidation tus nqi ntawm npib tsib xee{1}}raws li alloys 3D luam tawm poob los ntawm 80% ntawm qhov kub ntawm 650 degree.
Chemical plating/electroplating: Muab cov khaubncaws sab nraud povtseg ntawm Ni-P, Ni-B, thiab lwm yam alloys los sau cov flaws saum npoo thiab ua ib zaj duab xis tiv thaiv. Electroless npib tsib xee phosphorus alloy, piv txwv li, yuav txiav qhov corrosion tam sim no ntom ntawm stainless hlau hauv dej hiav txwv los ntawm 95%. Nws tsis kam mus corrosion yog yuav luag zoo li ntawm titanium alloy.
Anodizing yog qhov zoo rau kev tsim cov tuab oxide txheej ntawm lub teeb hlau zoo li aluminium alloys. Piv txwv li, tom qab nruj anodizing, aluminium alloy qhov chaw ntawm lub dav hlau tuaj yeem tiv taus ntsev tsuag corrosion rau ntau tshaj 5000 teev thiab muaj qhov kub ntawm 2320K. Qhov no ua tau raws li cov qauv ib puag ncig siab heev.
3, Piv txwv li cas kev lag luam siv cov ntaub ntawv thiab rooj plaub
Nyob rau hauv aerospace teb, GE Aviation's LEAP cav cav turbine hniav siv 3D luam ntawv thiab tshuaj polishing ua rau saum npoo smoother, mus ntawm 10 μm mus rau 1 μm, yog li ua rau lub cav 8% ntau aerodynamic. Nyob rau tib lub sijhawm, kev kho HIP tshem tawm cov pores sab hauv, uas txuas ntxiv lub siab -kub qaug zog lub neej ntawm 5000 txog 12000 cycles.
Kev kho mob cog: Tom qab electrochemical polishing, Johnson & Johnson's 3D- luam tawm titanium alloy interbody fusion ntaus ntawv muaj qhov roughness ntawm 0.8 μm, 90% txo qis hauv Staphylococcus aureus adhesion, thiab kev soj ntsuam zoo ntawm ntau dua 95%.
Dej hiav txwv Engineering: Tus nqi corrosion ntawm 3D luam tawm nickel aluminium bronze valve ua los ntawm CNOOC hauv dej ntsev mus ntawm 0.5mm / xyoo txog 0.05mm / xyoo tom qab laser cladding thiab tshuaj nickel plating. Lub valve lub neej kev pab cuam kuj tau nce 10 npaug.