Lub luag haujlwm tseem ceeb ntawm cov hmoov silicon carbide ntsuab hauv cov ntaub ntawv refractory
Hmoov silicon carbide ntsuab, lub npe suab nyuaj. Nws yog ib homsilicon carbide (SiC), uas yog smelted ntawm ntau tshaj 2000 degrees hauv lub cub tawg tiv taus nrog cov khoom siv raw xws li quartz xuab zeb thiab roj av coke. Txawv ntawm cov feem ntaudub silicon carbide, nws muaj kev tswj hwm qhov tseeb ntawm cov txheej txheem hauv theem tom qab ntawm kev smelting, nrog ob peb yam tsis huv thiab siab purity crystal, yog li nws nthuav tawm cov xim ntsuab lossis tsaus ntsuab tshwj xeeb. Qhov "purity" no muab nws qhov nyuaj heev (Mohs hardness yog siab txog 9.2-9.3, thib ob tsuas yog pob zeb diamond thiab boron carbide) thiab kev ua tau zoo heev thermal conductivity thiab lub zog kub siab. Hauv qhov chaw ntawm cov ntaub ntawv refractory, nws yog "pob txha tawv" uas tuaj yeem tiv taus, sib ntaus, cua sov thiab tsim.
Yog li, cov hmoov ntsuab no yuav ua li cas qhia nws lub zog hauv lub ntiaj teb nyuaj ntawm cov ntaub ntawv refractory thiab dhau los ua tus "txiv neej tseem ceeb" uas tsis tseem ceeb?
Txhim kho lub zog thiab pov cov "pob txha hlau" kub siab: Cov ntaub ntawv refractory ntshai tshaj plaws ntawm "tsis tuaj yeem tiv taus" qhov kub siab, ua mos thiab vau.Ntsuab silicon carbide micropowdermuaj qhov nyuaj heev thiab muaj zog kub zoo heev. Ntxiv nws rau ntau yam refractory castables, ramming cov ntaub ntawv lossis cib zoo li ntxiv cov hlau muaj zog siab rau cov pob zeb ua vaj tse. Nws tuaj yeem tsim cov pob txha txhawb nqa khov kho hauv lub matrix, tiv taus qhov deformation thiab softening ntawm cov khoom siv nyob rau hauv qhov kub siab. Cov castables ntawm lub tshuab cua sov tawg hlau channel ntawm lub Hoobkas hlau loj siv cov ntaub ntawv ib txwm ua ntej, uas eroded sai sai, cov hlau ntws tus nqi tsis tuaj yeem nce, thiab kev saib xyuas ntau zaus ncua kev tsim khoom. Tom qab ntawd, kev tshawb fawb txog kev siv tshuab tau ua, thiab qhov sib piv ntawmhmoov silicon carbide ntsuab tau nce ntxiv ntau heev. "Auj, nws zoo kawg nkaus!" Tus thawj coj ntawm lub rooj cob qhia tom qab ntawd tau hais tias, "Thaum cov khoom siv tshiab raug muab tso rau hauv, cov hlau yaj tau ntws los, sab ntawm cov kav dej tau pom tseeb tias 'tom', qhov nrawm ntawm cov hlau ntws tig rov qab, thiab tus naj npawb ntawm lub sijhawm txij nkawm tau txo qis ntau dua ib nrab, thiab cov nyiaj txuag tau tag nrho yog cov nyiaj tiag tiag!" Qhov kev tawv no yog lub hauv paus rau lub neej ntev ntawm cov khoom siv kub siab.
Txhim kho kev xa cua sov thiab teeb tsa "lub dab dej cua sov" rau ntawm cov khoom siv: Cov khoom siv refractory uas muaj cua sov ntau dua, qhov zoo dua! Rau cov chaw xws li lub qhov rooj qhov cub coke thiab cov phab ntsa sab nraud ntawm lub cell electrolytic aluminium, cov khoom siv nws tus kheej yuav tsum tau xa cua sov sai sai kom tiv thaiv qhov kub hauv zos kom tsis txhob siab dhau thiab puas tsuaj. Lub zog ua kom sov ntawm cov hmoov silicon carbide ntsuab yog "tus tub ntxhais kawm zoo heev" ntawm cov khoom siv tsis yog hlau (qhov kub hauv chav tsev thermal conductivity coefficient tuaj yeem ncav cuag ntau dua 125 W / m · K, uas yog ntau dua li cov cib av nplaum ib txwm muaj). Ntxiv nws rau cov khoom siv refractory hauv ib qho tshwj xeeb zoo li kev muab "cov kav dej cua sov" zoo rau hauv cov khoom siv, uas tuaj yeem txhim kho qhov kev ua kom sov tag nrho, pab kom cua sov sai thiab sib npaug, thiab zam kev kub dhau thiab tev tawv lossis puas tsuaj los ntawm "mob plab".
Txhim kho kev tiv thaiv kev poob siab thermal thiab tsim kom muaj peev xwm "nyob twj ywm thaum muaj kev hloov pauv": Ib qho ntawm cov "tua neeg" tshaj plaws ntawm cov khoom siv refractory yog qhov txias thiab cua sov sai. Lub cub tawg tau qhib thiab kaw, thiab qhov kub hloov pauv sai heev, thiab cov khoom siv ib txwm yooj yim "tawg" thiab tev tawm.Ntsuab silicon carbidemicropowder muaj qhov coefficient nthuav dav thermal me me thiab kev ua haujlwm thermal sai, uas tuaj yeem sib npaug sai sai qhov kev ntxhov siab los ntawm qhov sib txawv ntawm qhov kub thiab txias. Kev qhia nws rau hauv lub kaw lus refractory tuaj yeem txhim kho cov khoom siv lub peev xwm los tiv taus qhov hloov pauv kub tam sim ntawd, uas yog, "kev tiv thaiv thermal shock". Lub qhov ncauj hlau castable ntawm lub cement rotary kiln raug rau qhov kub thiab txias hnyav tshaj plaws, thiab nws lub neej luv luv yog qhov teeb meem ntev. Ib tug kws ua haujlwm tsim kho lub cub tawg uas muaj kev paub dhau los tau hais rau kuv tias: "Txij li thaum siv cov castables muaj zog nrog cov hmoov silicon carbide ntsuab ua cov khoom sib xyaw thiab hmoov tseem ceeb, qhov cuam tshuam tau tam sim ntawd. Thaum cua txias tshuab thaum lub cub tawg raug nres rau kev saib xyuas, lwm qhov tawg, tab sis cov khoom siv qhov ncauj kiln no ruaj khov thiab ruaj khov, thiab muaj tsawg dua qhov tawg ntawm qhov chaw. Tom qab ib lub voj voog, qhov poob tau pom tseeb txo qis, txuag ntau yam kev siv zog kho!" Qhov "kev thaj yeeb" no yog los daws qhov kev nce thiab nqis hauv kev tsim khoom.
Vim tiashmoov silicon carbide ntsuab ua ke lub zog siab, kev ua haujlwm kub siab, kev tiv taus kub zoo heev, thiab kev tiv taus kev yaig, nws tau dhau los ua "tus khub" hauv kev tsim cov khoom siv refractory niaj hnub no. Los ntawm cov cub tawg, cov converters, cov trenches hlau, thiab cov tank torpedo hauv cov hlau thiab hlau metallurgy mus rau cov electrolytic cell hauv cov hlau tsis yog ferrous metallurgy; los ntawm cov khoom tseem ceeb ntawm cov cement kilns thiab cov iav kilns hauv kev lag luam cov ntaub ntawv tsim kho mus rau cov kilns corrosive heev hauv cov teb ntawm kev lag luam tshuaj lom neeg, hluav taws xob, thiab kev hlawv pov tseg, thiab txawm tias nchuav khob thiab ntws cov cib hlau rau casting ... Txhua qhov chaw muaj qhov kub siab, hnav, hloov pauv sai, thiab kev yaig, cov hmoov av ntsuab no ua haujlwm. Nws tau nyob ntsiag to hauv txhua lub cib refractory thiab txhua lub square ntawm castable, muab kev tiv thaiv zoo rau "lub plawv" ntawm kev lag luam - cov kilns kub siab.
Tau kawg, qhov "kev cog qoob loo" ntawm cov hmoov silicon carbide ntsuab nws tus kheej tsis yooj yim. Txij li kev xaiv cov khoom siv raw, kev tswj hwm qhov tseeb ntawm cov txheej txheem smelting cua sov tiv thaiv (kom ntseeg tau tias muaj kev ntshiab thiab ntsuab), mus rau kev sib tsoo, sib tsoo, pickling thiab tshem tawm cov khoom tsis huv, kev faib tawm hydraulic lossis airflow precision, mus rau kev ntim khoom nruj raws li qhov loj me ntawm cov khoom me me (los ntawm ob peb microns mus rau ntau pua microns), txhua kauj ruam muaj feem cuam tshuam nrog kev ua haujlwm ruaj khov ntawm cov khoom kawg. Tshwj xeeb, qhov huv si, qhov loj me ntawm cov khoom me me thiab cov duab ntawm cov hmoov micropowder ncaj qha cuam tshuam rau nws qhov kev sib kis thiab cov nyhuv hauv cov ntaub ntawv refractory. Nws tuaj yeem hais tias cov hmoov silicon carbide ntsuab zoo yog nws tus kheej cov khoom ntawm kev sib xyaw ua ke ntawm thev naus laus zis thiab kev ua haujlwm tes ua.