1. Cov xwm txheej ua haujlwm hnyav Cov kev sib tw ntawm Automotive Mufflers:Lub tshuab hluav taws xob tsheb yuav tsum tiv taus qhov kub ntawm 700-800℃(ntau tshaj qhov ntsuas kub ntawm maus taus), thiab tib lub sijhawm, nws raug rau kev yaig ntawm cov khoom corrosive hauv cov pa roj (xws li SO₂, NOx). Cov khoom siv niaj hnub muaj cov kev txwv hauv qab no: 1. Pure titanium (JIS qib 2): Nws yog nquag tsim oxidized nyuaj thiab nkig txheej ntawm qhov kub thiab txias, ua rau nto tev thiab txo qis zog. Cov kev sim qhia tau hais tias tom qab ntshiab titanium raug txuas mus rau 800℃rau 200 teev, lub thickness ntawm oxide txheej nce 15μm thiab lub zog flexural txo los ntawm 40% . 2. Stainless hlau: Nws muaj tsis txaus corrosion tsis kam thiab nws yog feem ntau to los ntawm lub shedding ntawm oxide nplai} tom qab siv ntev {{15}. Nyob rau hauv ib puag ncig simulated tso pa tawm, cov hlau tsis muaj steel muffler tsim corrosion perforation tom qab tsuas yog 500 teev ntawm kev ua haujlwm. 3. Thaum ntxov titanium alloys (xws li Ti-1.5Al qauv): Txawm hais tias lawv txhim kho oxidation tsis kam, lawv lub zog kub kub tsis txaus, ua rau nws nyuaj rau kev ua kom tau raws li qhov yuav tsum tau ua ntawm cov txheej txheem nyuaj. Ntawm 400 degree, nws lub zog tensile tsuas yog 550MPa, uas yog ib qho kev txhim kho tsawg dua piv rau cov titanium ntshiab. Kev tsis sib haum xeeb tseem ceeb: Nws yog ib qho tsim nyog yuav tsum ua tiav ib txhij ua tiav qhov kub-kub oxidation tsis kam, siab zog thiab zoo ductility los tiv thaiv cov huab cua puag ncig downstream ntawm muffler lub hauv paus yeeb nkab (700-800 degree).
Ii. Ti-1.5Al Titanium Alloy:Kev Tshawb Fawb Txog Kev Tshawb Fawb thiab Kev Tshawb Fawb Txog Kev Ua Haujlwm Los daws cov teeb meem uas tau hais los saum no, kev lag luam tau txhim kho Ti-1.5Al titanium alloy. Los ntawm kev sib xyaw kom zoo thiab kev tswj cov txheej txheem, nws cov kev ua tau zoo tau txhim kho zoo heev . 1. Cov qauv tsim thiab cov tshuaj tiv thaiv antioxidant: Kev tswj hwm ntawm Al-cim: 1.5% Al yog ntxiv los ua ib qho tuab Al₂O₃ tiv thaiv zaj duab xis, uas inhibits qhov diffusion ntawm oxygen rau hauv titanium substrate. Kev sim cov ntaub ntawv qhia tau hais tias oxidation tus nqi ntawm kev txhim kho Ti-1.5Al ntawm 800℃yog 60% qis dua li ntawm cov titanium ntshiab, thiab oxide txheej peeling tus nqi poob los ntawm 15μm / h rau 2μm / h. Cov kab ke sib koom ua ke: Qhia 0.1% Y (yttrium) los kho cov nplej thiab tiv thaiv cov qoob loo ciam teb los ntawm oxidation. Qhov sib ntxiv ntawm Y lub ntsiab lus tau nce cov khoom elongation tom qab tawg los ntawm 12% mus rau 15%, ua tau raws li qhov yuav tsum tau ua ntawm cov khoom siv mufflers. Cov txheej txheem kho cua sov: Kev Kho Mob + Kev Laus (STA) tau txais yuav. Tom qab tuav ntawm 550℃rau 4 teev, cua txias yog nqa tawm kom hloov pauv theem thiab ua tiav qhov sib npaug ntawm lub zog thiab plasticity. 2. Kev sib piv ntawm qhov kub thiab txias: Hauv kev ua haujlwm ntawm 400 degree, lub zog flexural ntawm kev txhim kho Ti{- 1.5Al ncav cuag 480MPa, uas yog peb zaug. Lub zog tensile ncav cuag 550MPa, uas yog ob npaug ntawm cov ntshiab titanium. Hauv kev ntsuas kub kub ntawm 800 degree, nws lub zog attenuation tus nqi tsawg dua 5%, thaum cov ntshiab titanium tshaj 20% . 3. Kev ua tau zoo thiab kev ntseeg tau Formability: Qhov txhim kho Ti-1.5Al muaj qhov zoo ductility (elongation tom qab tawg ntau dua lossis sib npaug rau 15%), uas txhawb nqa cov txheej txheem, thiab cov txheej txheem sib npaug. yog 25% siab dua li ntawm titanium alloys thaum ntxov. Thermal stability: Tom qab 1000 teev ntawm kev ntsuas kub siab (700-800 degree), tsis muaj kab nrib pleb ntawm cov khoom nto, thiab cov thickness ntawm oxide txheej tsuas yog nce los ntawm 8μm. Daim ntawv pov thawj thoob ntiaj teb: Hauv xyoo 2009, nws dhau los ntawm ASTM tus qauv sau npe thiab tau txais kev tso cai kev lag luam los ntawm tsib lub tebchaws suav nrog Tebchaws Meskas, Tebchaws Askiv, thiab Lub Tebchaws Yelemees, dhau los ua thawj qhov kub-resistant titanium alloy uas tau txais los ntawm cov khoom siv hluav taws xob loj.
Iii. Technical Advantages thiab Application Scenarios ntawm Titanium Alloy Mufflers
1. Lub teeb yuag thiab lub zog-txuag Cov txiaj ntsig Qhov ntom ntawm titanium alloy (4.5g / cm³) tsuas yog 60% ntawm cov hlau tsis muaj steel. Siv lub muffler ntawm ib qho qauv tsheb zoo nkauj ua piv txwv. Tom qab siv titanium alloy, nws qhov hnyav tau txo los ntawm 8.2kg rau 5.6kg, txo qis ntawm 32%. Kev kuaj tsheb tiag tiag qhia tau tias kev siv roj txo los ntawm 2.1% thiab carbon dioxide emissions poob los ntawm 5.8g / km.
2. Kev txhim kho Durability: Hauv kev simulated 100,000-kilometer txoj kev sim, lub thickness ntawm oxide txheej ntawm titanium alloy muffler tsuas yog nce los ntawm 8μm (45μm rau stainless hlau). Tsis muaj cov kab nrib pleb tshwm sim (ntau dhau los ntawm cov kab nrib pleb tshwm nyob rau hauv stainless hlau). Cov pa hluav taws xob hloov pauv yog tsawg dua 3% (15% rau cov hlau tsis muaj steel), tsis txhob poob lub zog.
3. Cov ntawv thov raug: Siab- qauv kev ua tau zoo: Porsche 911 Turbo S txais titanium alloy mufflers, ua tiav qhov hnyav ntawm 12kg, suab nrov dua, thiab 0.2-thib ob txo hauv 0-100km / h acceleration time. Hybrid qauv: Toyota Prius Prime txo cov cua sov los ntawm titanium alloy central hlab, ua kom cov roj teeb thermal tswj system los ntawm 8% thiab txuas ntxiv cov hluav taws xob ntshiab los ntawm 6 kilometers. Hauv kev sib tw: F1 kev sib tw tsheb muffler txais titanium alloy nyias-walled hlab (0.8mm tuab), uas tuaj yeem ua haujlwm tsis tu ncua rau 2 teev ntawm 1000℃yam tsis ua haujlwm, thiab nws qhov hnyav yog 40% tsawg dua li cov tshuaj stainless hlau.
Daim ntawv thov ntawm titanium alloys nyob rau hauv tsheb mufflers yog ib tug zoo meej ua ke ntawm cov ntaub ntawv science thiab engineering xyaum. Los ntawm kev tsim kho tshiab ntawm Ti-1.5Al mus rau thoob ntiaj teb cov ntawv pov thawj, titanium alloys tsis tsuas yog hais txog kev lag luam mob cov ntsiab lus ntawm siab -kub oxidation thiab lub zog attenuation, tab sis tseem tsav lub evolution ntawm automotive tso tshuab rau "lub teeb yuag, kev pab lub neej ntev, thiab qis emissions". Nrog rau kev ua tiav hauv kev tsim khoom ntxiv thiab thev naus laus zis thev naus laus zis, titanium alloy mufflers yuav dhau los ua cov khoom siv hauv cov tsheb loj thiab cov qauv tsheb tshiab, pab txhawb cov khoom siv tseem ceeb rau kev txo qis cov hom phiaj thoob ntiaj teb.