Cov Khoom Siv Tshawb Fawb Tom Qab 850℃Cartridge Heaters
Thaum cov kab ntau lawm nres vim tias lub tshuab cua sov ua tsis tiav, cov tshuaj tiv thaiv tam sim no feem ntau yog liam rau cov chaw tsim khoom. Tab sis nyob rau hauv ntau qhov xwm txheej, tus neeg ua txhaum tiag yog qhov tsis sib haum xeeb ntawm cov ntaub ntawv siv thiab kev ua haujlwm. Rau cov ntawv thov uas xav tau qhov kub thiab txias ntawm 850 degree, tus qauv tawm -- txee rau cov khoom siv hluav taws xob tsuas yog yuav tsis muaj sia nyob.
Lub Sheath: Ntau dua li Kev Tiv Thaiv Cover
Lub plhaub sab nraud ntawm lub tshuab hluav taws xob cartridge yog qhov tseem ceeb ntawm kev sib txuas ntawm cov cua sov sab hauv thiab cov txheej txheem ua kom sov. Ntawm 850 degree, nws tiv taus kev ntxhov siab heev thiab muaj peev xwm tua tshuaj lom. Cov hlau tsis zoo xws li AISI 304 lossis 316 pib oxidise thiab ntsuas sai sai thaum kub tshaj 800 degree. Qhov kev oxidation txuas ntxiv no tsis yog tsuas yog ua rau cov phab ntsa sheath tsis muaj zog tab sis cov nplai uas ua raws li cov thermal insulator, ntxiab cua sov sab hauv thiab ua kom nrawm rau sab hauv degradation.
Rau kev ua haujlwm ruaj khov 850 degree, nickel-hlau-chromium alloys xws li Incoloy 800HT lossis Incoloy 840 yog cov qauv kev lag luam. Cov high -kev ua tau zoo alloys muaj ntau npaum li cas ntawm npib tsib xee thiab chromium, uas tsim ib tug ntom, nws tus kheej- kho chromium oxide txheej ntawm qhov chaw. Cov txheej no tiv thaiv oxidation, carburisation, thiab sulfidation thaum tuav lub zog thiab ductility txawm tias ci liab - kub. Incoloy 800 tso cai rau ua haujlwm kub txog li 760℃thiab sheath kub txog 870 degree. Rau qhov tshwj xeeb corrosive ib puag ncig-chlorides lossis qee cov kua qaub, piv txwv li- cov khoom xws li Titanium lossis Hastelloy tuaj yeem raug txiav txim siab, txawm hais tias cov no feem ntau muaj qhov kub siab ua haujlwm qis dua li Incoloy series.
Insulation Core: Lub Unsung Hero
Nyob rau hauv lub sheath, lub rwb thaiv tsev system ua ob qho tseem ceeb functions: hluav taws xob cais thiab thermal conduction. Magnesium oxide (MgO) tseem yog cov khoom xaiv vim nws muaj kev sib xyaw tshwj xeeb ntawm lub zog dielectric siab thiab zoo thermal conductivity thaum compacted kom zoo.
Txawm li cas los xij, MgO muaj qhov tsis muaj zog tseem ceeb -nws yog hygroscopic, txhais tau tias nws nkag tau dej noo los ntawm huab cua ib puag ncig. Moisture ingress dramatically txo cov rwb thaiv tsev tiv thaiv, ua rau to tam sim no. Yog tias lub rhaub dej kub dhau sai heev, cov dej ntws ntws mus rau hauv chav, tsim kom muaj lub siab sab hauv uas tuaj yeem ua rau dielectric tawg thiab kev puas tsuaj loj.
Qhov no yog qhov uas cov txheej txheem swaging ua qhov tseem ceeb. Thaum lub sij hawm swaging, lub sheath yog plastically deformed nyob rau hauv high radial compression, compacting MgO hmoov rau hauv ib tug ntom ceramic monolith nrog ib tug raug ntom ntau tshaj 3.5 g / cm³. Qhov siab no - ntom ntom matrix tsis tsuas yog txhim kho thermal conductivity tab sis tsim lub cev impenetrable barrier uas ua rau kom ya raws lub vapor zog. Yog tias tsis muaj qhov kev sib cog lus no, MgO muaj cov hnab ntim cua me me uas ua raws li cov cua sov hauv lub cev- cov cua sov uas tsim los ntawm cov hlau tsis muaj zog yuav raug kaw, yuam kom cov coil sab hauv ua haujlwm ntawm qhov kub siab tshaj qhov kub ntawm lub plhaub.
Cov Hlau Resistance: Lub plawv ntawm qhov teeb meem
Ntawm qhov kub thiab txias, cov hlau tiv thaiv nws tus kheej yuav tsum tau ua tib zoo xaiv. Thaum tus txheej txheem nickel-chromium (NiCr) alloys yuav txaus rau qis dua - kev siv kub, 850℃kev ua haujlwm feem ntau yuav tsum tau hlau-chromium-aluminium (FeCrAl) alloys, uas muaj superior oxidation tsis kam thiab thermal stability ntawm qhov kub siab no.
Kev paub qhia tau hais tias sim txiav cov fab ntawm cov khoom xaiv ntawm 850℃inevitably ua rau ua tsis tiav ntxov. Kev sib xyaw ua ke ntawm Incoloy sheath, siab -purity swaged MgO rwb thaiv tsev, thiab FeCrAl tsis kam xaim tsis yog qhov kev xaiv tsis txaus ntseeg- nws yog qhov tshwm sim ntawm ntau xyoo ntawm cov ntaub ntawv teb thiab cov ntaub ntawv tshawb fawb. Rau cov txheej txheem uas xav tau zoo ib yam, txhim khu kev qha siab - qhov kub thiab txias, cov ntaub ntawv no tsis yog xaiv tau; lawv yog qhov tseem ceeb.
