Sib piv Sheath Materials for Ultra-Tsuas Kub Kub Cartridge Heater Service
Lub plhaub sab nraud ntawm lub tshuab rhaub cartridge yog thawj kab ntawm kev tiv thaiv ib puag ncig. Nws tiv thaiv cov khoom sab hauv los ntawm kev puas tsuaj, corrosion, thiab ya raws. Nws hloov cov cua sov los ntawm cov hlau tsis kam mus rau lub hom phiaj. Hauv ultra- daim ntawv thov kub qis, cov ntaub qhwv yuav tsum ua tag nrho cov no thaum tuav cov txheej txheem kev ncaj ncees ntawm -50℃.
Kev xaiv ntawm cov khoom siv sheath tsis yog ib qho yooj yim ntawm kev xaiv qhov feem ntau los yog qhov kev xaiv pheej yig tshaj. Cov alloys sib txawv coj txawv ntawm qhov kub thiab txias, thiab kev xaiv tsis ncaj ncees ua rau ua tsis tiav ntxov. Nkag siab txog cov kev xaiv thiab lawv cov kev lag luam tawm -offs pab ua kom paub cov lus qhia tshwj xeeb.
Stainless hlau 304 yog tus qauv kev lag luam rau kev dav dav - lub hom phiaj cartridge rhaub. Nws muaj kev tiv thaiv corrosion zoo, tsim nyog tus nqi, thiab cov khoom tsim nyog rau kev siv feem ntau. Txawm li cas los xij, ntawm qhov kub qis dua -40℃, 304 ua qhov tsis tshua muaj ductile. Cov ductile- mus rau-nkig hloov kub ntawm ntau cov ntaub ntawv ua ib qho tseem ceeb ntawm rho tawm 30 degrees thiab hauv qab no. Stainless hlau 304 poob qhov cuam tshuam tsis kam thiab tawg toughness, ua rau nws yooj yim rau tawg los ntawm thermal shock lossis mechanical stress.
Stainless hlau 316L muaj kev ua tau zoo tshaj hauv kev pabcuam cryogenic. Nws cov ntsiab lus ntau dua nickel thiab qis carbon cov ntsiab lus tswj cov khoom zoo los ntawm qhov kub thiab txias. Nws tiv taus corrosion zoo dua 304 thiab ua kom nws cov ductility ntawm qhov kub thiab txias qhov twg 304 ua nkig. Rau ntau daim ntawv thov, 316L sawv cev rau qhov chaw qab zib ntawm tus nqi thiab kev ua haujlwm - zoo dua li 304 hauv qhov txias yam tsis muaj tus nqi hwm ntawm cov khoom sib txawv.
Austenitic qib 321 thiab 316 muaj ductility zoo dua ntawm qhov kub thiab txias vim tias lawv cov microstructure tseem ruaj khov. Cov ntaub ntawv no tsis dhau mus rau qhov zawv zawg - mus rau - kev hloov pauv uas cuam tshuam rau qee yam hlau tsis zoo. Lawv tuav lawv cov pob txha toughness thiab cuam tshuam tsis kam txawm tias txias rau cov kua nitrogen kub.
Inconel 600 thiab 800 series alloys sawv cev rau qhov kev xaiv zoo tshaj plaws rau cov ntawv thov cryogenic tshaj plaws. Cov npib tsib xee -chromium alloys ua haujlwm thermal cycling ntawm qib cryogenic thiab kub tshaj 500 degrees Celsius yam tsis tau poob kev ncaj ncees. Lawv tiv taus thermal qaug zog, tswj cov khoom siv dag zog thoob plaws qhov kub thiab txias, thiab muaj kev tiv thaiv corrosion zoo heev. Tus nqi yog ntau dua li cov hlau tsis muaj steel, tab sis rau cov ntawv thov uas tsis ua haujlwm tsis yog qhov kev xaiv, Inconel feem ntau yog qhov kev xaiv nkaus xwb.
Titanium alloys tshwm nyob rau hauv tshwj xeeb daim ntaub ntawv uas qhov hnyav los yog tshuaj compatibility yog ib qho kev txhawj xeeb. Titanium muaj kev tiv thaiv corrosion zoo heev thiab tswj cov ductility ntawm qhov kub thiab txias. Txawm li cas los xij, nws kim heev thiab nyuaj rau kev tsim khoom, txwv tsis pub nws siv rau niche daim ntawv thov.
Kev xaiv ntawm cov khoom siv sheath cuam tshuam ntau tshaj li qhov ua tau ntev. Thermal conductivity sib txawv ntawm cov alloys, cuam tshuam li cas cov cua sov hloov mus los ntawm cov hlau sab hauv mus rau lub hom phiaj. Cov thermal conductivity ntau dua txhais tau tias muaj kev hloov pauv tau zoo dua thiab txo qis hauv qhov kub thiab txias rau qhov muab hluav taws xob tso tawm. Qhov sib txawv tsis yog loj heev, tab sis nyob rau hauv marginal daim ntawv thov, lawv tuaj yeem muaj teeb meem.
Kev tiv thaiv corrosion ua qhov tseem ceeb hauv qhov chaw txias dua li ntau tus engineers paub. Condensation thiab Frost tsim cov dej noo uas tuaj yeem tawm tsam qhov chaw tsis muaj kev tiv thaiv. Kev raug tshuaj lom neeg los ntawm de- cov tshuaj icing, tshuaj ntxuav, lossis cov ntaub ntawv txheej txheem ntxiv rau cov khoom siv corrosion. Kev kho deg zoo li passivation tshem tawm cov kab mob hlau thiab rov ua cov txheej txheem chromium oxide tiv thaiv. Electropolishing tsim ib tug du, tsis yog - ntxeem tau nto uas tiv thaiv tshuaj tua kab mob.
Kev paub hauv lub tshav pob qhia cov qauv hauv kev xaiv cov khoom siv sheath. Standard cartridge heaters nrog 304 sheaths poob ntau zaus hauv cov ntawv thov cia txias dua li cov 316L sheaths. Cov kev ua tsis tiav feem ntau tshwm sim raws li cov kab nrib pleb ntawm cov ntsiab lus kev ntxhov siab, feem ntau ntawm kev hloov pauv ntawm cov cua sov thiab qhov tsis muaj cua sov. Cov kab nrib pleb no tso cai rau cov dej noo nkag, ua rau hluav taws xob tsis ua haujlwm.
Rau cov ntawv thov ntawm -50℃thiab qis dua, Inconel alloys qhia tau tias lub neej ua haujlwm ntev dua li cov hlau tsis muaj steel. Tus nqi them nqi pib feem ntau yog rov qab los ntawm kev txo qis qis, hloov pauv tsawg dua, thiab cov nqi kho qis dua. Rau cov txheej txheem tseem ceeb uas tsis ua haujlwm txhais tau tias kev kaw ntau lawm lossis cov khoom poob, Inconel feem ntau yog qhov kev xaiv zoo tshaj plaws ntawm cov khoom siv lub neej.
Cov lus qhia tshwj xeeb ntawm cov ntaub qhwv rau ib qho -50℃ib lub taub hau hluav taws xob cua sov raj yuav tsum xav txog qhov chaw ua haujlwm tag nrho. Qhov kub thiab txias heev, thermal cycling zaus, tshuaj lom neeg raug, mechanical kev nyuaj siab, thiab xav tau kev pab cuam lub neej txhua yam cuam tshuam rau qhov kev xaiv zoo. Cov khoom siv uas ua haujlwm zoo kawg nkaus hauv ib daim ntawv thov yuav ua tsis tau ntxov ntxov hauv lwm qhov. Nkag siab txog cov kev xav tau tshwj xeeb ntawm txhua qhov kev teeb tsa qhia kev xaiv rau cov khoom siv rau txoj haujlwm.
