Sheath Material Selection - Kev txiav txim siab tseem ceeb rau kev ua haujlwm 700 degree
A 700℃ib leeg -kawg cartridge rhaub tsuas yog zoo li nws cov ntaub qhwv. Lub sheath yog thawj kab ntawm kev tiv thaiv oxidation, corrosion, thiab mechanical puas. Xaiv cov khoom tsis ncaj ncees lawm, thiab lub tshuab cua sov ua tsis tau ntxov ntxov-qee zaum hauv ib lub lis piam es tsis yog xyoo.
Cov kev xaiv txheem
Rau feem ntau cov ntawv siv lub tshuab cua sov txog li 650 degree, stainless hlau 304 lossis 316 yog qhov kev xaiv tus qauv. Cov ntaub ntawv no raug nqi - siv tau thiab ua tau zoo ntawm qhov kub nruab nrab. Tab sis ntawm 700 degree, lawv muaj kev txwv loj.
Tshaj 500 degree, 304 thiab 316 stainless hlau tsim tuab, nkig oxide nplai uas spill thaum lub sij hawm thermal cycling. Nyob rau hauv lub xub ntiag ntawm chlorides, sulfur compounds, los yog aggressive yas outgassing, pitting, phab ntsa thinning, thiab thaum kawg ua txhaum cai tshwm sim. A 304 stainless hlau sheath ntawm 700℃tuaj yeem ua tsis tau tsawg dua 500 teev raws li qhov xav tau.
Stainless hlau 310S
Rau kev ua haujlwm kub ntawm 600℃thiab 700 degree, stainless hlau 310S yog qhov kev xaiv zoo dua. Qhov no siab - kub alloy muaj kev txhim kho oxidation tsis kam piv rau 304 thiab 316 qib. Nws yog feem ntau teev rau pwm cartridge rhaub ua haujlwm nyob rau hauv 600-700℃ntau yam.
Incoloy 800 – lub siab -kub workhorse
Thaum kub txog 700℃lossis siab dua, Incoloy 800 dhau los ua cov khoom nyiam. Cov npib tsib xee no - hlau-chromium alloy muaj npe nrov rau nws qhov tshwj xeeb tiv thaiv oxidation thiab carburization ntawm qhov kub thiab txias. Nws nyob ruaj khov thiab tiv taus qhov ntsuas kub txawm tias qhov kub nce mus txog 700℃lossis ntau dua.
Qhov kev ua tau zoo sib txawv yog qhov txaus ntshai. Nyob rau tib lub sijhawm, Incoloy 800 sheath kav ntev li 5,000 txog 10,000 teev ntawm 700 degree, thaum 304 stainless hlau kav ntev dua 500 teev. Qhov ntawd yog kaum npaug rau nees nkaum qhov sib txawv hauv lub neej ua haujlwm. Incoloy 800 kuj muaj cov ntsiab lus nickel ntau dua, uas ua rau nws tiv taus ntau dua rau carburization thiab nitridation los ntawm cov khoom tawg hauv cov khoom siv yas. Qhov no ua rau nws zoo tagnrho rau kub- khiav manifolds, siab{14}} kub tuag, thiab tshuaj lom neeg{15}} cov khoom siv ua haujlwm.
Inconel - rau cov mob hnyav tshaj plaws
Rau cov ntawv thov uas thawb dhau 700℃lossis koom nrog qhov chaw muaj corrosive, Inconel alloys muaj kev ua tau zoo dua. Cov npib tsib xee -chromium-raws li superalloys tuav lub zog thiab oxidation tsis kam ntawm qhov kub siab tshaj 1000℃. Txawm li cas los xij, tus nqi yog siab dua Incoloy, yog li Inconel tau tshwj tseg rau cov ntawv thov uas xav tau tshaj plaws.
Lub compaction factor
Sheath khoom tsis yog tib qho kev xav xwb. Qhov zoo ntawm MgO rwb thaiv tsev thiab cov txheej txheem compaction kuj cuam tshuam rau lub neej ntev. High-density swaging compacts MgO kom nyob ze theoretical ntom, uas txhim kho thermal conductivity thiab dielectric zog. Premium cartridge heaters ua tiav MgO densities 5 mus rau 7 npaug siab dua li cov raj cua sov li niaj zaus los ntawm kev ua kom nrawm nrawm. Qhov no tiv thaiv kev txav mus los hauv lub sijhawm thermal cycling thiab txo qis, qhib circuits, thiab burnout ntxov.
Tus nqi - xam cov txiaj ntsig
Incoloy 800 sheaths raug nqi ntau dua stainless hlau. Tab sis lub neej ntev kev pab cuam -feem ntau tsib mus rau nees nkaum lub sij hawm ntev dua - ua rau kev nqis peev tsim nyog nyob rau hauv feem ntau cov ntawv thov kev lag luam. Tus nqi ntawm ib qho kev txwv tsis pub ntau lawm feem ntau tshaj tus nqi sib txawv ntawm cov hlau tsis muaj steel thiab lub rhaub Incoloy.
Lub tswv yim takeaway
Rau kev ua haujlwm 700 degree, tsis txhob ua raws li tus qauv stainless hlau. Ntsuas qhov chaw ua haujlwm-kub, caij tsheb kauj vab zaus, raug tshuaj lom neeg- thiab xaiv cov ntaub qhwv raws li. Rau feem ntau - cov ntawv thov kub, Incoloy 800 yog qhov kev xaiv pom zoo. Rau qhov kub ntawm 600℃thiab 700 degree, 310S stainless hlau yog qhov kev xaiv siv tau. Kev nqis peev ntxiv rau hauv cov ntaub ntawv sheath kom raug them rov qab rau hauv kev txo qis qis thiab lub neej ntawm lub tshuab hluav taws xob ntev dua.
Ntau qhov chaw muaj kev lag luam-plastic txhaj tshuaj molding, tuag casting, tshuaj ua, khoom noj khoom haus-tam sim no sib txawv corrosion thiab kub cov nyom. Kev sib piv cov ntaub ntawv sheath rau cov ntawv thov tshwj xeeb yog qhov tseem ceeb rau kev ua haujlwm siab tshaj plaws.
