Yuav ua li cas muaj zog yog nickel - titanium alloy
Txij li thaum nws pom nyob rau hauv nruab nrab - {ob caug xyoo ua tsaug rau nws cov cim xeeb cov nyhuv cim thiab superelasticity. Nws lub zog yog tshwj xeeb tshaj yog - tsis yog nws tuaj yeem tiv taus heev ntxhov siab yam tsis tau tawg, tab sis nws kuj tuaj yeem rov qab tau tom qab rov ua haujlwm dua. Qhov kev sib xyaw no ntawm lub zog thiab yoog tau tshaj lub peev xwm ntawm cov hlau ib txwm muaj.
Lub zog tensile
Lub zog tensile ntawm nickel - titanium alloy yog li ntawm qib ntawm siab- lub zog titanium alloys. Nws cov txiaj ntsig lub zog ntawm 195 txog 690 MPa thiab tuaj yeem raug tswj kom yog los ntawm kev kho cua sov. Piv txwv li, annaling ntawm qhov kub tshaj 400 Qib Yield yields proprease muaj zog dua, ua rau nws muaj cov txheej txheem ntev li {}- bearing. Qis - kub} kub} kub}, txo cov txiaj ntsig lub zog thiab nce ntxiv, ua raws li qhov xav tau ntawm cov khoom siv hloov tau. Qhov kev hloov kho no ua rau muaj menyuam yaus npib tsib xee-titanium alloys kom tau raws li cov yuav tsum muaj ntawm ob lub zog thiab elasticity.
Lub superelasticity
Nitinol "superelasticity" yog lwm qhov ntev ntawm nws lub zog. Nyob rau hauv kev ntxhov siab, nws tuaj yeem tsim kev tawm tsam ywj pheej ntawm 25% (piv rau txog li 1% rau kev tiv thaiv zoo li qub), nws tag nrho cov duab, kev nthuav dav tsis muaj deformation. Cov cuab yeej no stats los ntawm nws cov cim martensitic transformation mechastenite theem rau ib lub crystal lub zog hloov mus rau ib lub crystal marensite theem, nqus tau ntau lub zog. Thaum lub zog sab nraud raug tshem tawm, cov theem hloov pauv hloov pauv, tso tawm lub zog thiab rov qab cov khoom uas nws cov qauv qub. Tus txheej txheem no ua rau nickel - titanium alloys kom muaj kev nthuav tawm "deb tshaj lawv lub zog ntawm lawv thaum raug cuam tshuam lossis pheej thauj khoom. Piv txwv li, hauv lub plawv nres, lawv tuaj yeem nthuav dav thiab cog lus nrog lub nkoj tawm hauv ntshav yam tsis muaj kev ua kom tsis muaj zog tawg.
Qaug zog lub neej
Lub zog yog xav tias tsis muaj nyob hauv nws ib qho - thauj cov kabmob muaj peev xwm tab sis kuj tseem nyob rau hauv nws ntev} lub sij hawm kev ntseeg tau. Nickel - titanium alloys muaj lub neej qaug zog tshaj li 1 × 10⁷ mus. Qhov no txhais tau tias cov khoom siv cog uas tsis muaj zog (xws li lub plawv dhia tsis muaj kev ntxhov siab ntawm tib neeg lub cev kub (37 degree) thiab cov ntshav txaus. Qhov kev ua tsaug ntau ntawm lub neej ntawm ob lub ntsiab hluav taws xob: thawj zaug, lub zog tsis txaus ntseeg thaum lub sij hawm hloov pauv kev pom zoo; second, the dense structure of the surface oxide layer (TiO₂), which effectively blocks the penetration of corrosive media and prevents the propagation of microcracks.
Ib qho "zoo meej tshuav" ntawm lub teeb yuag thiab lub zog siab
Nickel - titanium alloys muaj qhov sib piv ntawm tsuas yog 6.45}} {4 4}} lub zog steel. Qhov no "lub teeb tseem muaj zog" ua ke ua rau lawv cov khoom siv zoo tshaj plaws rau kev lag luam aerospace. Piv txwv li, hauv Satary Hnub Ci Vaj Huam Sib Luag xa tawm cov tshuab, Nickel {}} titanium springs tau muaj qhov kub tsawg kawg nkaus, tsav tsheb ncaj ncees. Hauv lub dav hlau tis regulators, lawv superelasticity nqus lub zog thaum txo qhov hnyav thiab txhim kho roj ua haujlwm. Lub teeb yuag yuag yuav tseem ceeb heev nyob rau hauv cov teb kho mob. Nitinol orthopedic kev cog lus muaj kev txhawb nqa txaus yam tsis muaj kev puas tsuaj rau cov ntaub so ntswg ib puag ncig vim qhov hnyav ntau dhau.
Corrosion Kuj
Nitinol cov corrosion ua hauj lwm surpasses uas yog 316L kev kho mob stainless hlau, ua tsaug rau lub xide oxide txheej (ti₂ thiab nitio₃) tsim rau nws nto. Hauv kev simulated tib neeg lub cev kua (xws li hank txoj kev daws teeb meem), nws txoj kev daws teeb meem tsuas yog 0.05ug / cms ion yog tsawg dua 0.2ug / cm² / hnub. Qhov no corrosion kuj tsis tsuas yog txuas ntxiv lub neej tab sis kuj tiv thaiv ion kev sib tw, ua kom muaj kev sib txuam ntawm cov hlau, kom muaj kev cuam tshuam ntev.
Lub "kev txawj ntse" ntawm Nitinol
Nitinol lub zog zoo, ua ke nrog nws cov duab nco thiab biocompatibility, tab tom thawb cov ciam ntawm cov ntaub ntawv tshawb fawb. Piv txwv li, los ntawm kev ntxiv cov ntsiab lus xws li nyiaj thiab hafnium, nibra-}} Cov tshuaj tua kab mob thiab muaj zog muaj peev xwm tsim tau. Electron nqaj melting thev naus laus zis tuaj yeem tsim lub npe nickel {}} titanium alloys nrog kev coj dawb huv ntawm 99.99%, txuas ntxiv txhim kho lawv lub zog thiab corrosion tsis kam. Nyob rau hauv lub neej yav tom ntej, raws li 3D tshuab luam ntawv tshuab, lub zog ntawm nickel {}} titanium}} pa tau nyob rau hauv cov chaw xws li cov tshuaj thiab hloov tau cov tshuaj kho mob thiab hloov pauv tau.
Los ntawm lub plawv stents mus rau lub plawv pem teb, los ntawm cov kev cog hniav ntse, Nickelic Kev cog lus, nrog rau lawv cov kev sib txuas ua ke thiab yoog raws li cov ciam teb ntawm cov ntaub ntawv thiab cov haujlwm. Ntau tshaj li hlau, nws yog "kev xav cov ntaub ntawv ntse" ntse - {{2}, nruj thiab ruaj khov thiab tsim nyog.
