Hauv kev tsim thiab tsim khoom ntawm 8 hli stainless hlau cartridge tso cua sov-compact, ib zaug - xaus hluav taws xob cua sov raj siv dav hauv kev lag luam siv- kev xaiv ntawm magnesium oxide (MgO) hmoov raws li cov khoom siv insulating yog qhov tseem ceeb. Kev ua haujlwm zoo ntawm cov hlau tsis muaj zog thiab cov phab ntsa sab hauv ntawm cov hlau sheath, MgO hmoov ua haujlwm ob qho tseem ceeb: muab hluav taws xob rwb thaiv tsev los tiv thaiv luv luv Circuit Court thiab ua kom yooj yim hloov hluav taws xob los ntawm cov cua sov mus rau sab nraud. Qhov kev sib npaug ntawm cov khoom no ua rau nws yog ib qho tseem ceeb hauv kev ua kom lub tshuab cua sov muaj kev ntseeg siab, kev nyab xeeb, thiab kev ua haujlwm. Txawm li cas los xij, MgO hmoov lub hauv paus muaj zog hygroscopicity-nws nyiam nqus dej noo los ntawm ib puag ncig- ua rau muaj kev sib tw tseem ceeb, xav tau tshwj xeeb noo noo- pov thawj kev kho mob xws li cov hmoov hloov pauv lossis cov txheej txheem sib khi. Kev nkag siab txog cov txheej txheem xaiv, cov khoom, thiab kev tuav ntawm MgO hmoov yog qhov tseem ceeb rau cov engineers, manufacturers, thiab kawg - cov neeg siv los txhim kho lub rhaub lub neej thiab kev ua haujlwm zoo hauv ntau hom kev siv, los ntawm cov yas molding mus rau kev ua tshuaj.
Lub luag haujlwm tseem ceeb ntawm MgO hmoov hauv 8 hli cartridge rhaub yog ua raws li dielectric insulator. Cov hlau tsis kam, feem ntau yog ua los ntawm nichrome (NiCr) alloy, ua kom sov los ntawm hluav taws xob tsis kam, thiab tsis muaj kev rwb thaiv tsev zoo, nws tuaj yeem nkag mus rau hauv kev sib cuag ncaj qha nrog cov hlau tsis huv (feem ntau 304 lossis 316 qib), ua rau hluav taws xob tsis zoo, arcing, lossis txawm tias muaj kev puas tsuaj loj. MgO hmoov puv qhov chaw nyob ib ncig ntawm lub coiled hlau, tsim kom muaj qhov siab - tiv thaiv kev tiv thaiv uas tuaj yeem tiv taus qhov hluav taws xob mus txog ntau txhiab volts, nyob ntawm seb qhov compaction ceev thiab purity. Nws lub zog dielectric-feem ntau nyob ib ncig ntawm 10-15 kV/mm- ua kom muaj kev nyab xeeb nyob rau hauv siab - fais fab xwm txheej, xws li hauv kev txhaj tshuaj molding nozzles lossis tuag- cov cuab yeej casting, qhov twg hluav taws xob ncaj ncees tsis sib tham.
Qhov tseem ceeb sib npaug yog MgO qhov zoo tshaj plaws thermal conductivity, uas nyob ntawm 30-50 W/m·K ntawm chav tsev kub, deb tshaj rau ntau lwm yam insulators xws li ceramics lossis cua. Cov cuab yeej no tso cai rau cov cua kub ceev thiab zoo ib yam los ntawm cov xaim sab hauv mus rau hauv lub plhaub, txo cov thermal gradients thiab hotspots uas tuaj yeem degrade lub rhaub lub sij hawm. Nyob rau hauv 8 hli txoj kab uas hla lub rhaub, qhov chaw muaj tsawg, kev hloov pauv hluav taws xob zoo yog qhov tseem ceeb rau kev ua tiav cov watt siab ceev (txog 100 W / in²), ua rau lub sij hawm teb ceev-feem ntau ncav cuag lub hom phiaj kub hauv qab ib feeb. Qhov no ua rau lub rhaub zoo tagnrho rau cov txheej txheem dynamic xws li sealing cov ntaub ntawv los yog cov cuab yeej ntsuas cua sov, qhov twg precision thiab ceev ncaj qha cuam tshuam cov khoom lag luam.
Txawm hais tias qhov zoo li no, MgO hmoov lub hygroscopic xwm yog ob -edged ntaj. Ntshiab MgO tuaj yeem nqus tau txog 20-30% ntawm nws qhov hnyav hauv cov dej noo los ntawm huab cua puag ncig, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig ntub lossis thaum lub sijhawm khaws cia. Qhov kev nqus dej no txo qis nws cov khoom insulating zoo heev, vim dej ua hluav taws xob, muaj peev xwm txo tau lub zog dielectric los ntawm kev txiav txim ntawm qhov loj thiab ua rau cov dej ntws los yog tawg. Nyob rau hauv cov xwm txheej hnyav, noo noo tuaj yeem ua rau cov hmoov nthuav tawm lossis tsim cov kab hluav taws xob, ua rau lub rhaub tsis ua haujlwm sai tom qab kev teeb tsa. Txhawm rau txo qhov no, cov tuam ntxhab siv cov tshuaj tiv thaiv dej noo. Ib txoj hauv kev yog MgO hmoov hloov, qhov twg cov hmoov yog tshuaj kho los yog calcined ntawm qhov kub thiab txias (siab tshaj 1000 degree) kom txo tau nws qhov chaw nto thiab affinity rau dej. Cov khoom siv ntxiv xws li silicates lossis hydrophobic txheej tuaj yeem muab tso ua ke los txhim kho kev tiv thaiv dej tsis muaj kev cuam tshuam thermal lossis hluav taws xob ua haujlwm. Xwb, los yog ua ke, lub tshuab hluav taws xob cartridge tau dhau los ua cov txheej txheem sib khi ntawm qhov qhib kawg. Qhov no yuav koom nrog epoxy resins, ceramic plugs, los yog welded kaus mom los tsim ib tug hermetic foob, tiv thaiv ya raws thaum lub sij hawm ua hauj lwm los yog cia. Nyob rau hauv cov qauv tsim, lub tshuab nqus tsev annealing los yog inert gas backfilling thaum lub sij hawm sib dhos ntxiv expels residual noo noo, xyuas kom meej cov hmoov tseem qhuav thiab zoo.
Thaum xaiv MgO hmoov rau 8 hli stainless hlau cartridge rhaub, ntau yam tseem ceeb yuav tsum tau txiav txim siab kom haum rau daim ntawv thov kev thov. Purity yog qhov tseem ceeb tshaj plaws: High-purity MgO (99.5% lossis siab dua) txo cov impurities xws li silica lossis hlau oxides uas tuaj yeem txo cov thermal conductivity lossis qhia cov kab hluav taws xob. Particle loj thiab morphology kuj ua lub luag hauj lwm -zoo, spherical hais (feem ntau 1-}10 microns) tso cai rau kom zoo dua compaction thaum lub sij hawm swaging, ua tiav qhov ceev txog li 3.2 g / cm³ rau qhov zoo tshaj plaws tshav kub hloov thiab rwb thaiv tsev. Rau siab-kev siv kub, xws li melting low{11}}melting alloys lossis infrared heating devices, electro-fused MgO yog nyiam dua li hom dej hiav txwv, vim nws muaj kev tiv thaiv zoo rau thermal shock thiab degradation ntawm qhov kub siab tshaj 800 degree.
Kev sib raug zoo nrog lub tshuab cua sov ua haujlwm ib puag ncig yog lwm qhov kev ntsuas. Hauv cov chaw corrosive, zoo li alkaline lossis acidic cua sov, MgO yuav tsum tiv thaiv cov tshuaj tiv thaiv uas tuaj yeem ua rau nws cov qauv. Kev ntsuam xyuas rau hygroscopicity ncej- hloov kho- ntawm cov qauv xws li ASTM D570 rau kev nqus dej- kom ntseeg tau tias cov hmoov kho tau khaws cov dej noo tsawg (zoo tshaj hauv qab 0.5%). Tus nqi-kev ua tau zoo yuav tsum tsis txhob saib; thaum tus nqi hloov kho MgO nce tus nqi them ua ntej los ntawm 10-20%, nws txuas ntxiv cov cua sov lub neej ntawm 5,000 mus rau ntau dua 10,000 teev, txo tag nrho cov tswv cuab hauv cov xwm txheej tsis tu ncua xws li cov zaub mov ci los yog cov tshuaj tua kab mob.
Cov txheej txheem tsim khoom cuam tshuam rau kev xaiv thiab. Thaum lub sij hawm sib dhos, cov hmoov yog vibrated los yog centrifugally puv ib ncig ntawm cov hlau ua ntej lub raj yog swaged kom compact nws. Cov hmoov tsis zoo tuaj yeem ua rau voids lossis tsis sib xws, ua rau kub hnyiab ntxov. Cov neeg muag khoom muaj npe nrov, xws li cov neeg ua raws li ISO 9001 cov qauv, muab ntawv pov thawj MgO nrog cov khoom siv taug qab, ua kom muaj kev sib xws. Rau kev cai 8 hli tso cua sov-feem ntau nyob rau hauv semiconductor welding los yog roj hmab vulcanization- cov hmoov tuaj yeem raug kho, tej zaum nrog kev txhim kho thermal muab tub lim rau ultra- ua haujlwm siab.
Hauv kev xyaum, tiag tiag - piv txwv hauv ntiaj teb no qhia txog qhov tseem ceeb ntawm kev xaiv kom raug. Nyob rau hauv cov yas extrusion kab, siv unmodified MgO nyob rau hauv cov chaw ntub dej tau ua rau tsis tu ncua, qhov hloov pauv hloov tau txhim kho lub sijhawm los ntawm 30%. Ib yam li ntawd, nyob rau hauv seawater distillation units, kaw cov cua sov nrog hydrophobic MgO tiv taus saline ya raws, tiv thaiv corrosion- cuam tshuam rau lub sijhawm poob.
Thaum kawg, xaiv magnesium oxide hmoov rau 8 hli stainless hlau cartridge tso cua sov yog txheej txheem nuanced uas sib npaug rwb thaiv tsev, thermal conductivity, thiab ya raws. Los ntawm qhov tseem ceeb siab -purity, hloov kho MgO thiab cov txheej txheem sealing muaj zog, cov tuam txhab tsim khoom tuaj yeem tsim cov cua sov uas xa cov kev ua tau zoo, kev ua haujlwm zoo thoob plaws ib qho kev siv. Qhov no tsis yog tsuas yog txhim kho kev nyab xeeb ntawm kev ua haujlwm tab sis kuj tseem txhawb nqa kev txuag hluav taws xob thiab kev ruaj ntseg hauv kev lag luam cua sov. Txhawm rau kom tau txais txiaj ntsig zoo, koom tes nrog cov kws tshaj lij thiab ua daim ntawv thov- cov kev sim tshwj xeeb- xws li kev ntsuas cua sov los yog kev ntsuas kev tiv thaiv hluav taws xob- xyuas kom cov hmoov xaiv tau zoo sib xws nrog lub tshuab cua sov qhov xav tau, ua rau txoj hauv kev mus ntev - lub sijhawm ua tiav hauv ib puas xyoo - hloov kho tshuab.
