Titanium vs. Stainless hlau vs. Incoloy - Lub Caj Npab Heater Sheath yog dabtsi?
Sawv ntsug nyob rau hauv pem hauv ntej ntawm lub khib ntawm lub tshuab cua sov, cov kev xaiv tuaj yeem xav tias nyuaj. Stainless hlau. Incoloy. Titanium. Tooj. Txhua tus muaj nws cov neeg txhawb nqa, nws tus nqi taw tes, thiab nws lub hnab ntawv ua haujlwm. Thiab tseem, ntau qhov kev txiav txim siab yuav khoom yog ua los ntawm tus nqi ib leeg- lossis phem dua, ntawm tus cwj pwm. "Peb ib txwm siv stainless hlau" tsis yog qhov tshwj xeeb; nws yog kev twv txiaj.
Yog li dab tsi tiag cais cov ntaub ntawv no? Aib lub taub hau cua sov tube (cartridge rhaub)Nws yog ib qho tseem ceeb ib yam nyob rau hauv tsis hais txog ntawm lub sheath: ib tug tiv thaiv kab mob nyob ib ncig ntawm ib tug ceramic core, insulated nrog siab -purity magnesium oxide (MgO). Qhov sib txawv yog nyob hauv cov raj hlau sab nraud- thiab qhov sib txawv ntawd txiav txim siab qhov twg lub tshuab rhaub tuaj yeem siv tau, nws yuav kav ntev npaum li cas, thiab seb nws yuav ua tsis tau zoo lossis puas tsuaj.
Stainless hlau(304 lossis 316L) yog qhov kev xaiv ua ntej rau - lub hom phiaj cua sov. Nws yog tus nqi pheej yig, dav dav, thiab tsim nyog rau cov dej huv, huab cua, roj, thiab tsis yog- ib puag ncig corrosive. Tab sis stainless hlau yog yooj yim rau chloride nres, pitting, thiab kev nyuaj siab corrosion cracking. Hauv cov dej ntsev lossis cov kua qaub, nws lub neej kev pabcuam tuaj yeem ntsuas tau hauv lub lis piam lossis hli.
Incoloy(800 lossis 840) muaj kev ua haujlwm siab zoo dua - qhov kub thiab txias dua li stainless hlau - txog 870℃piv rau li 500℃rau stainless. Nws yog ib qho kev xaiv zoo rau siab - cua kub cua sov thiab qee qhov kev siv corrosive. Txawm li cas los xij, Incoloy tseem raug rau corrosion hauv acidic thiab alkaline daws. Nws tiv taus oxidation tab sis tsis tshuaj tua kab mob.
Titanium(TA1 lossis TA2, ASTM Qib 2 sib npaug, 99.7% purity) siv txoj hauv kev sib txawv. Tsis txhob sim tiv thaiv corrosion los ntawm alloying, titanium tso siab rau nws tus kheej - kho TiO₂ txheej txheej. Qhov no ua rau nws tshwj xeeb tshaj yog tiv taus ntau yam ntawm corrosive media: nitric acid, sulfuric acid, phosphoric acid, chromic acid, alkalis, ntsev tov, chlorides, thiab electroplating da dej. Nyob rau hauv cov cheeb tsam no, titanium ib leeg - tas cartridge rhaub tuaj yeem kav ntev li 3 txog 5 npaug ntawm cov hlau tsis sib npaug.
Toojmuaj lub siab tshaj plaws thermal conductivity ntawm tej yam ntaub ntawv sheath. Nws hloov cov cua sov sai thiab ua tau zoo. Tab sis tooj liab yog qhov muaj feem cuam tshuam rau corrosion thiab tsim nyog tsuas yog rau qhov tsis muaj -corrosive ib puag ncig. Nws tsis tshua muaj kev xaiv rau kev lag luam ua kua cua sov.
Raws li kev paub dhau los, cov txheej txheem xaiv yuav tsum pib nrog qhov nruab nrab ua haujlwm. Puas yog kua corrosive? Yog tias muaj -yog tias muaj cov kua qaub, alkalis, ntsev, lossis chlorides -titanium yuav tsum yog thawj qhov kev txiav txim siab. Yog tias daim ntawv thov xav tau qhov kub siab tshaj 600℃thiab ib puag ncig tsis yog -corrosive, Incoloy yuav yog qhov kev xaiv zoo dua. Rau kev huv, tsis yog - daim ntawv thov corrosive uas tus nqi yog qhov kev txhawj xeeb tseem ceeb, stainless hlau yuav txaus.
Ib qho tseem ceeb nuance: thermal conductivity tseem ceeb tsawg dua li ntau qhov kev xav. Titanium ua cua sov ntawm kwv yees li tib yam li stainless hlau-li 15-20 W / (m·K). Ob leeg yog txaus rau feem ntau immersion cua sov daim ntaub ntawv. Qhov sib txawv tiag tiag yog corrosion kuj, tsis kub hloov ceev.
Cov tswv yim tswv yim? Tsis txhob qhia cov ntaub ntawv sheath kom txog rau thaum cov tshuaj muaj pes tsawg leeg, concentration, thiab kev khiav hauj lwm kub ntawm cov txheej txheem kua yog tag nrho to taub. Ib titaniumcartridge rhaubyog kev nqis peev hauv kev ntseeg siab. Lub tshuab cua sov stainless hlau yog thawj koom ruam uas tsis muaj dab tsi yuav mus tsis ncaj ncees lawm. Hauv ib puag ncig corrosive, qhov ntawd yog thawj koom ruam uas tsis tshua them nyiaj.
