Kev tsim khoom ntawm ultrafine titanium hlau (inch 0.01-0.5mm) yog ib qho ntawm cov txheej txheem nyuaj tshaj plaws thiab nruj tswj cov txheej txheem hauv kev ua haujlwm ntawm titanium hlau sib sib zog nqus. Nws qhov kev tsim khoom tsis yog tsuas yog hais txog "txo qhov loj me", tab sis cov txheej txheem engineering uas ua haujlwm los ntawm kev xaiv cov khoom siv raw, ntau cov txheej txheem ua haujlwm, kev kho cua sov, thiab kev sim ua tiav. Ib qho kev sib txawv me me hauv txhua qhov txuas tuaj yeem ua rau cov khoom seem ntawm cov khoom tiav, ua rau muaj kev sib tw zoo rau kev ua haujlwm zoo ntawm lub tuam txhab.
1, Melting txheej txheem: qhov chaw tswj ntawm siab -purity substrate
Lub hauv paus pib ntawm kev tsim khoom yog melting ntawm siab -purity titanium ingots, uas ncaj qha txiav txim siab cov yam ntxwv thiab kev ruaj ntseg ntawm cov khoom siv hlau. Nqus consumable arc melting (VAR) los yog nqus induction melting (VIM) cov txheej txheem feem ntau yog siv nyob rau hauv kev lag luam, nrog rau lub hom phiaj tseem ceeb ntawm nruj tswj cov ntsiab lus ntawm interstitial ntsiab xws li oxygen, nitrogen, thiab hydrogen. Rau kev kho mob thiab aviation qib ultrafine titanium hlau, cov ntsiab lus oxygen yuav tsum tau tswj qis dua 0.12% thiab cov ntsiab lus hydrogen yuav tsum tsis pub tshaj 0.0015%. Tab sis txawm tias cov impurities no dhau ntawm tus qauv, nws yuav nthuav dav ntxiv hauv micrometer theem teeb duab, ua rau xaim brittleness lossis kev ua haujlwm tsis zoo.
Thaum lub sij hawm melting, cov txheej txheem muaj pes tsawg leeg yuav tsum tau ua kom haum rau qhov sib txawv ntawm daim ntawv thov scenarios: industrial ntshiab titanium (Gr1 / Gr2) ultrafine xov hlau mloog zoo rau cov impurities uas tsis tshua muaj thiab siab yooj thiab lub melting zaus yuav tsum tau optimized (feem ntau 2-3 VAR remelting) kom lav lub uniformity ntawm cov muaj pes tsawg leeg; Qhov piv ntawm aluminium thiab vanadium cov ntsiab lus yuav tsum tau tswj kom meej meej rau kev kho mob hlau hlau xws li Ti-6Al-4V ELI, thiab cov oxidation yuav tsum raug tshem tawm hauv lub tshuab nqus tsev, muab lub hauv paus rau tom qab biocompatibility thiab qaug zog tiv thaiv.
2, Kub ua thiab kos duab txias: kev tswj zoo ntawm cov nplej loj thiab kev ntxhov siab
Lub melted titanium ingot yuav tsum tau ua tiav rau hauv ib tug titanium pas nrig los yog billet nrog ib txoj kab uas hla ntawm 8-12 hli los ntawm kub forging thiab kub dov txheej txheem. Nyob rau theem no, qhov kub ntawm forging yuav tsum tau tswj nyob rau hauv qhov tseem ceeb ntawm thaj tsam ntawm theem (950-1050 degree) thiab thaj tsam + theem kom tsis txhob muaj cov qoob loo ntau dhau lossis tsis sib xws. Tom qab txias, cov hlau tsis muaj nkag mus rau hauv cov txheej txheem ntau dhau qhov txias txias, uas yog cov kauj ruam tseem ceeb kom ua tiav micrometer loj. Txawm li cas los xij, txhua txoj kev kos duab yuav ua kom zoo dua cov titanium nplej thiab ua rau muaj kev ntxhov siab sab hauv. Yog tias tsis tshem tawm hauv lub sijhawm, nws muaj feem yuav ua rau cov hlau tawg thaum lub sij hawm tom qab kos duab.
Intermediate annealing kev kho mob ua ib qho tseem ceeb tsis nyob rau hauv lub txias txias txheej txheem: nws yuav tsum tau annealed nyob rau hauv lub nqus tsev vacuum los yog inert gas tiv thaiv huab cua raws li qhov kev hloov nyob rau hauv txoj kab uas hla (3-5 passes ib daim duab), nrog kub tswj ntawm 550-650℃thiab rwb thaiv tsev lub sij hawm meej rau qib feeb. Undue annealing tuaj yeem ua rau tsis muaj plasticity thiab brittleness thiab ntau dua qhov tshwm sim ntawm cov pob txha tawg; Overannealing tuaj yeem ua rau cov qoob loo loj hlob thiab cuam tshuam lub zog kawg ntawm cov khoom siv hlau. Rau ultra-fine xov hlau ntawm d Tsawg dua los yog sib npaug rau 0.1 hli, qhov kev nqus nrawm yuav tsum tau txo qis rau 0.5-1m / min thiab tshwj xeeb tungsten steel pwm yuav tsum tau ua haujlwm los txo kev sib txhuam thiab kev ntxhov siab.
3, Core nyuaj: Micron qib tswj qhov sib xws ntawm qhov loj thiab qhov zoo ntawm qhov chaw
Thaum cov hlau txoj kab uas hla mus txog qib micrometer, qhov nyuaj ntawm kev tswj qhov loj me thiab qhov zoo ntawm qhov chaw nce exponentially, uas kuj yog lub hauv paus teeb meem kom paub qhov txawv siab - kawg thiab cov khoom zoo tib yam. Cov ntawv thov siab kawg xws li kev kho mob sutures thiab aviation sensors xav tau ib txoj kab uas hla ntawm txoj kab uas hla kam rau kev tswj ntawm ± 1-3 μ m. Qhov no tsis tsuas yog yuav tsum tau pwm qhov tseeb ntawm 0.001mm, tab sis kuj tseem muaj tiag -lub sijhawm saib xyuas qhov kub, nruj, thiab lubrication txheej txheem thaum lub sijhawm teeb duab. Lub tshuab lubrication yuav tsum tau siv cov khoom siv tshwj xeeb los xyuas kom meej lubrication zoo thiab tsis txhob seem impurities paug rau saum npoo; Qhov chaw kos duab yuav tsum muaj qhov ntsuas kub tsis tu ncua (20 ± 2 degree), cov av tsis tu ncua (50 ± 5% RH), thiab tsis muaj plua plav (Class 1000 huv cheeb tsam) kom tiv thaiv kev hloov pauv ntawm ib puag ncig los ntawm kev cuam tshuam qhov kev ruaj ntseg.
Kev tswj qhov zoo ntawm qhov chaw yog qhov sib npaug: qhov saum npoo ntawm cov hlau tiav yuav tsum tsis muaj qhov tsis xws luag xws li khawb, oxide txheej (thickness Tsawg dua lossis sib npaug li 5nm), microcracks, thiab lwm yam. Cov teeb meem no yuav nthuav dav hauv kev ntxhov siab lossis corrosive ib puag ncig, ua rau cov hlau tsis ua haujlwm. Rau lub hom phiaj no, electrolytic polishing los yog plasma tu txheej txheem yuav tsum tau tshem tawm cov txheej txheej oxide, thaum lub sij hawm tiag tiag - kev tshuaj ntsuam xyuas ntawm qhov chaw tsis xws luag yog ua los ntawm ib tug online optical nrhiav system (nrhiav qhov tseeb ntawm 0.0005mm), thiab cov khoom tsis tsim nyog raug tshem tawm tam sim ntawd.
4, Kev xeem cov khoom tiav: Cov ntawv pov thawj tag nrho ntawm kev pabcuam kev ntseeg tau
Cov khoom tiav kev soj ntsuam ntawm ultrafine titanium hlau yuav tsum npog qhov loj, nto, txhua yam khoom, thiab microstructure, tsim ib tug tag nrho cov txheej txheem zoo tswj voj. Kev tshawb nrhiav hauv online siv lub laser caliper los saib xyuas txoj kab uas hla hloov hauv lub sijhawm. Kev tshawb pom offline suav nrog kev kuaj pom qhov tsis xws luag (loj loj 500 zaug) kev soj ntsuam, kev ntsuas kev ua haujlwm tensile (lub zog tawg ntau dua lossis sib npaug ntawm 800MPa, elongation Ntau dua lossis sib npaug li 15%), kev tshuaj ntsuam metallographic (tseem ceeb npaum li cas thiab cov ntaub so ntswg uniformity), thiab qib kho mob cov khoom kuaj biocompatibility (cytotoxicity, kuaj cytotoxicity). Qee cov khoom lag luam siab - kawg kuj yuav tsum muaj kev sim ua kom qaug zog kom ntseeg tau ntev - lub sij hawm ruaj khov nyob rau hauv siab - zaus cyclic loads.
Xaus: Kev nthuav dav ntawm kev siv tshuab muaj zog
Qib kev tsim khoom ntawm ultrafine titanium hlau ncaj qha qhia txog kev yaj, kev ua haujlwm, kev tswj kom zoo, thiab kev tswj xyuas kom zoo ntawm cov khoom lag luam titanium. Los ntawm titanium ingots mus rau micrometer qib hlau cov ntaub ntawv, txhua qhov txuas yuav tsum sib npaug peb qhov kev xav tau ntawm "precision, kev ua tau zoo, thiab kev ruaj ntseg". Qhov no kuj yog vim li cas siab -zoo ultrafine titanium hlau tau ntev tau monopolized los ntawm cov lag luam nrog ib tug ua tiav cov saw hlau (melting kub ua precision kos tag nrho cov kev xeem). Nrog rau kev kho dua tshiab ntawm kev thov nyob rau hauv siab -kawg teb xws li kev kho mob thiab aerospace, cov txheej txheem yuav tsum tau rau ultrafine titanium hlau yuav txuas ntxiv mus, txhawb kev tawg nyob rau hauv titanium cov ntaub ntawv ua technology mus rau finer thiab meej cov lus qhia.
