Puas yog titanium flammable?
Hauv kev lag luam ntawm cov khoom siv hlau, titanium tau nyiam ntau yam vim nws cov khoom tshwj xeeb, nrog rau cov lus nug ntawm seb titanium puas yog nplaim taws ua rau muaj kev lag luam tsis tu ncua. Cov lus teb rau lo lus nug no tsis yog ib qho yooj yim yog los yog tsis yog, tab sis zoo sib xws rau daim ntawv uas titanium muaj nyob, qhov kub thiab txias, thiab ib puag ncig uas nws siv.
Lub cev, titanium muaj qhov siab melting point ntawm 1668 ± 4℃thiab qhov kub ntawm 3260 ± 20 degree. Qhov siab melting thiab boiling point tus yam ntxwv muab nws tsis tshua muaj zog stability ntawm chav tsev kub. Txawm li cas los xij, thaum titanium muaj nyob rau hauv daim ntawv hmoov, nws qhov kev pheej hmoo ntawm kev kub nyhiab nce ntxiv. Qhov chaw saum npoo ntawm hmoov titanium tau nce ntau heev, ua rau thaj chaw sib cuag loj dua nrog cov pa oxygen. Thaum raug hluav taws xob qhib, kev sib txhuam, lossis cov hluav taws kub zoo li qub, nws muaj kev cuam tshuam rau kev sib tsoo hnyav lossis txawm tias tawg. Piv txwv li, nyob rau hauv titanium alloy ua rhiav, yog hais tias hmoov tsis tau ntxuav tam sim ntawd, nplua titanium hmoov tej zaum yuav spontaneously combust vim hluav taws xob zoo li qub. Cov yam ntxwv no ua rau cov titanium hmoov raug cais raws li cov khoom siv hluav taws xob thiab muaj kev phom sij, yuav tsum muaj cov dej noo nruj heev - pov thawj thiab hluav taws kub - pov thawj ntsuas thaum khaws cia thiab kev thauj mus los.
Cov yam ntxwv combustion ntawm tej titanium yog txawv kiag li ntawm nws cov hmoov daim ntawv. Nyob rau hauv qhov kub thiab txias, qhov ntom ntom titanium oxide (TiO₂) tiv thaiv zaj duab xis sai sai rau saum npoo ntawm titanium ntau. Cov yeeb yaj kiab no zoo cais cov pa oxygen los ntawm cov hlau substrate, muab titanium zoo heev corrosion kuj. Txawm li cas los xij, thaum qhov kub siab tshaj qhov tseem ceeb, qhov kev ruaj ntseg ntawm oxide zaj duab xis yog cuam tshuam. Thaum titanium raug rhuab mus rau qhov kub siab, oxide zaj duab xis maj mam hloov mus rau Ti₂O₃ thiab Ti₃O₅. Ob lub oxides no muaj qhov ntom ntom dua TiO₂, ua rau cov yeeb yaj kiab tawg thiab tev tawm, nthuav tawm cov hlau sab hauv mus rau qhov chaw oxidizing. Nyob rau ntawm lub sijhawm no, cov tshuaj tiv thaiv oxidation ntawm titanium hloov ntawm tus kheej -inhibiting mus rau exothermic, nrog rau cov cua kub tsub kom deb tshaj lub tshav kub dissipation tus nqi, thaum kawg ua rau combustion. Piv txwv li, nyob rau hauv aero engines, yog hais tias lub compressor hniav muaj ib tug cheeb tsam ntawm qhov kub thiab txias tshaj lub ignition point ntawm titanium (kwv yees li 1627 degree) vim yog txawv teb chaws tej yam khoom los yog aerodynamic cua sov, titanium alloy Cheebtsam yuav ignite nyob rau hauv vib nas this. Qhov tshwm sim "titanium hluav taws" no tau ua rau muaj ntau yam kev sib tsoo aviation, ua rau kev lag luam los nqis peev ntau hauv kev tshawb fawb thiab kev tsim cov nplaim hluav taws{10}} cov thev naus laus zis.
Cov yam ntxwv combustion ntawm titanium kuj zoo sib xws nrog nws cov tshuaj ib puag ncig. Nyob rau hauv chav tsev kub, titanium reacts tsuas yog nrog ob peb yam corrosive heev xws li hydrofluoric acid thiab kub concentrated hydrochloric acid. Txawm li cas los xij, nws cov tshuaj reactivity nce siab heev ntawm qhov kub thiab txias. Nws tuaj yeem hnov mob nrog oxygen los tsim titanium dioxide, nrog nitrogen los tsim titanium nitride, thiab nrog carbon los tsim titanium carbide. Nws tuaj yeem tshem tawm cov pa oxygen los ntawm qee cov hlau oxides. Qhov no muaj zog txo cov cuab yeej yuav tsum tau tswj nruj ntawm cov huab cua puag thaum lub sij hawm siab - kub smelting los yog vuam ntawm titanium kom tsis txhob sib cuag nrog reactive gases. Piv txwv li, thaum smelting titanium alloys hauv lub tshuab nqus tsev vacuum, lub tshuab nqus tsev siab yuav tsum tau khaws cia; txwv tsis pub, residual oxygen los yog nitrogen yuav hnov mob nrog titanium, ua rau cov khoom degradation.
Txawm hais tias muaj kev pheej hmoo ntawm combustion, titanium cov khoom tshwj xeeb ua rau nws yog ib qho khoom siv tsis zoo. Nyob rau hauv aerospace teb, titanium alloys, nrog rau lawv lub zog tshwj xeeb thiab siab -kub tsis kam, yog dav siv nyob rau hauv cov khoom tseem ceeb xws li cav compressor discs thiab hniav. Hauv thaj chaw kho mob, titanium biocompatibility nrog tib neeg cov ntaub so ntswg ua rau nws nyiam cov khoom siv rau cov pob qij txha thiab cov hniav cog hniav. Hauv kev lag luam tshuaj, titanium reactors tuaj yeem tiv taus cov kua qaub thiab alkali corrosion, ua kom lub neej ntev ntawm cov khoom siv. Txhawm rau sib npaug ntawm kev ua tau zoo thiab kev nyab xeeb, kev lag luam tau txo qhov kev pheej hmoo ntawm titanium los ntawm kev siv thev naus laus zis xws li kev hloov kho cov khoom siv, kev ua kom zoo dua qub, thiab cov txheej txheem tiv thaiv. Piv txwv li, Russia lub Ti-Cu-Al nplaim- retardant titanium alloys txo kev sib txhuam thaum tshav kub kub tsim los ntawm cov kua-theem lubrication mechanism, thaum US -tsim Ti-V-Cr alloys qis dua combustion kub los ntawm interrupting oxygen xa. Cov kev tsim kho tshiab no tso cai rau cov titanium alloys kom tswj tau lawv qhov zoo ntawm lub teeb yuag thaum tswj kev kub ntxhov.
Lub flammability ntawm titanium yog ib tug yam ntxwv uas yuav tsum tau saib dialectically. Lub flammability ntawm hmoov titanium yuav tsum nruj tswj kev ruaj ntseg, thaum lub stability ntawm tej titanium nyob rau hauv ib txwm tej yam kev mob muab lub hauv paus rau nws daim ntawv thov dav. Kev nkag siab txog cov txheej txheem sib xyaw thiab cuam tshuam ntawm titanium tsis yog tsuas yog lub ntsiab lus tseem ceeb hauv cov ntaub ntawv tshawb fawb tab sis kuj tseem ceeb heev rau kev ua kom muaj kev nyab xeeb ntawm cov khoom siv siab - kawg. Nrog kev tawg tsis tu ncua hauv nplaim taws- titanium alloy thev naus laus zis, titanium cov ntaub ntawv yuav ua rau pom lawv cov nqi hloov tsis tau hauv ntau thaj chaw, txhawb kev lag luam kev vam meej mus rau qib siab dua.
