Puas yog titanium nyuaj dua li cov hlau?
Hauv kev sib tham ntawm cov khoom siv hlau, cov lus nug ntawm seb titanium puas nyuaj dua li cov hlau feem ntau ua rau hauv - qhov tob tob. Qhov tseeb, kev txiav txim siab qhov zoo ntawm titanium thiab hlau tsuas yog raws li "hardness" tsis tiav. Ob leeg muaj qhov tshwj xeeb zoo hauv cov khoom siv kho tshuab, kev siv cov xwm txheej, thiab cov yam ntxwv ntawm cov khoom siv, thiab cov titanium alloys maj mam tshwm sim nyob rau hauv siab -kev tsim khoom kawg vim lawv cov kev ua tau zoo.
Los ntawm qhov yooj yim hardness foundations, ntshiab titanium hardness tsis yog tshwj xeeb tshaj yog zoo. Ntshiab titanium feem ntau muaj Brinell hardness qis dua 120 HB, thaum lub hardness ntau yam ntawm cov hlau zoo tib yam yog kwv yees li ntawm 150 thiab 300 HB, nrog quenched steel mus txog 600 HB. Qhov no txhais tau hais tias thaum sib piv ncaj qha qhov tseem ceeb hardness, steel feem ntau muaj sab tes xis. Txawm li cas los xij, kev ua haujlwm ntawm cov khoom siv tsis yog txiav txim siab tag nrho los ntawm ib qho kev qhia. Titanium qhov txiaj ntsig zoo kawg nkaus nyob hauv nws "lub zog tshwj xeeb," uas yog qhov piv ntawm lub zog rau qhov ntom ntom. Titanium tsuas muaj 57% qhov ntom ntawm cov hlau, tab sis nws lub zog tensile ncav cuag 686-1176 MPa, nrog rau qee qhov siab -kev ua tau zoo titanium alloys tshaj 1764 MPa, piv rau siab - lub zog steel. Piv txwv li, Ti-6Al-4V titanium alloy, feem ntau siv hauv aerospace, muaj lub zog tshwj xeeb ob zaug ntawm cov hlau zoo tib yam thiab rau lub sijhawm ntawm txhuas. Cov yam ntxwv tshwj xeeb ntawm "lub teeb yuag tsis tau muaj zog" ua rau titanium alloys nyiam cov khoom siv rau cov khoom tseem ceeb xws li dav hlau cav hniav thiab foob pob hluav taws roj tso tsheb hlau luam.
Titanium's corrosion kuj tseem yog qhov tseem ceeb ntawm kev sib tw kom zoo dua. Nyob rau hauv chav tsev kub, ib tug ntom thiab ruaj khov oxide zaj duab xis sai sai rau ntawm qhov chaw ntawm titanium. Cov oxide zaj duab xis no ua haujlwm zoo li lub ntuj tsim, muaj peev xwm ua tau zoo, tiv thaiv corrosion los ntawm seawater, muaj zog acids thiab alkalis, thiab txawm aqua regia. Cov ntaub ntawv kev sim cuam tshuam qhia tau hais tias titanium tuaj yeem tswj kev ruaj ntseg txawm tias tom qab tso rau hauv dej hiav txwv rau 20-50 xyoo, thaum cov hlau zoo tib yam feem ntau pom cov cim ntawm corrosion nyob rau hauv lub hlis nyob rau hauv ib puag ncig hnyav zoo sib xws. Qhov zoo tshaj plaws corrosion kuj muab titanium ib txoj hauj lwm irreplaceable nyob rau hauv teb xws li marine engineering thiab chemical khoom. Piv txwv li, siv titanium alloys nyob rau hauv kev txhawb nqa qauv ntawm offshore platforms yuav ua tau kom ntev lawv lub neej kev pab cuam thaum txo nqi txij nkawm; siv titanium hauv ob sab phlu hauv cov tshuaj reactors tuaj yeem tiv thaiv kom muaj kev pheej hmoo los ntawm corrosion.
Titanium qhov qaug zog tsis kam thiab qis -kub toughness kuj tseem ceeb heev. Nyob rau hauv txhua yam los yog hluav taws xob kev co, titanium lub vibration decay lub sij hawm ntev dua li cov hlau xws li hlau thiab tooj liab, txhais tau tias nws zoo dua tiv thaiv qaug zog puas tsuaj. Ib txhij, titanium tuav zoo toughness nyob rau hauv qis- qhov kub thiab txias; ntau annealed titanium alloys khaws txaus ductility ntawm -195.5℃kua nitrogen, thaum hlau yuav nkig ntawm qhov kub thiab txias. Cov cuab yeej no ua rau titanium yog ib qho khoom siv zoo tshaj plaws rau kev tsim cov khoom siv roj cryogenic (xws li cov pa oxygen thiab cov kua dej hydrogen cia tso tsheb hlau luam), thiab muab kev tiv thaiv kev ruaj ntseg rau kev siv ib puag ncig huab cua xws li cov cuab yeej tshawb fawb polar thiab qhov chaw sib sib zog nqus.
Txawm hais tias titanium qhov kev ua tau zoo heev, nws txoj kev ua haujlwm nyuaj thiab tus nqi txwv nws txoj kev siv dav dav. Titanium muaj qhov siab melting point ntawm 1668℃thiab thermal conductivity tsuas yog 1/5 ntawm cov hlau, ua rau nws yooj yim rau siab - cov cuab yeej kub thaum ua haujlwm, muab qhov xav tau siab heev ntawm cov cuab yeej txiav thiab cov txheej txheem machining. Tsis tas li ntawd, titanium lub ntiaj teb reserves tsuas yog 1/100th ntawm cov hlau, thiab nws cov nqi kho kom zoo ua rau tus nqi ntau dua 30 npaug ntawm cov hlau zoo tib yam. Txawm li cas los xij, nrog kev ua haujlwm tsis tu ncua hauv cov thev naus laus zis tshiab xws li 3D luam ntawv thiab precision casting, titanium kev ua tau zoo yog maj mam txhim kho, thiab cov nqi qis dua. Piv txwv li, Apple's iPhone 15 Pro siv qib 5 titanium alloy ncej, ua tiav qhov hnyav ntawm ib nrab (piv rau stainless hlau) thaum txhim kho khawb tsis kam. Cov ntaub ntawv no qhia txog kev nkag mus ntawm titanium los ntawm qib siab -end industrial sectors rau hauv kev lag luam khoom siv hluav taws xob.
Qhov "hardness debate" ntawm titanium thiab hlau yog qhov tseem ceeb qhov sib txawv ntawm qhov ua tau zoo tshaj plaws. Yog tias qhov yooj yim hardness thiab nqi -kev ua tau zoo yog qhov kev txiav txim siab tseem ceeb, steel tseem yog qhov kev xaiv loj; Txawm li cas los xij, yog tias lub teeb yuag, kev tiv thaiv corrosion, thiab qaug zog tiv taus, titanium alloys yog qhov zoo dua. Nrog kev txhim kho thev naus laus zis tas mus li thiab cov khoom siv nruj zuj zus uas yuav tsum tau ua hauv kev lag luam, titanium, cov khoom siv hlau tshwj xeeb no, yuav ua rau pom tseeb tias nws muaj peev xwm loj heev hauv ntau qhov chaw, pab txhawb kev loj hlob ntawm high -kev tsim khoom.
