High alumina cibyog ib hom ntawm silicon-alumina series refractory cib thiab kuj yog cov khoom siv nruab nrab refractory. Thiab cov qib high-alumina refractory bricks kuj txawv. Los ntawm siab mus rau qis, lawv yog: LZ-80, LZ-75, LZ-65, LZ-55, thiab LZ-48. Kev tsim cov txheej txheem ntawm high-alumina refractory bricks yuav tsum muaj kev kub siab molding thiab high-temperature sintering. Kev tswj cov ntsiab lus ntau lawm tuaj yeem txiav txim siab qhov zoo ntawm nws cov kev ua tau zoo.
Yog li, dab tsi ua rau tawg nyob rau hauv high-alumina refractory bricks? Hnub no kuv yuav qhia rau koj txog qhov ua rau tawg nyob rau hauv siab alumina refractory cib.
1: Yog vim li cas rau raw khoom
Qhov zoo ntawm cov khoom siv raw yog qhov tseem ceeb cuam tshuam rau qhov tshwm sim ntawm cov kab nrib pleb hauv siab alumina cib. Yog hais tias cov ntaub ntawv raw muaj ntau impurities, tshwj xeeb tshaj yog impurities xws li K2O thiab Na2O, lawv yuav ua rau tsis sib xws kev ntxhov siab nyob rau hauv lub cib thaum lub sij hawm sintering txheej txheem, ua rau tawg. Tsis tas li ntawd, qhov loj me ntawm cov khoom siv raw thiab cov hmoov zoo ntxiv kuj tseem yog qhov tseem ceeb cuam tshuam rau qhov zoo ntawm cov cib. Tsis sib npaug particle loj faib los yog tsis tsim nyog ntxiv ntawm cov hmoov zoo yuav ua rau inconsistent shrinkage ntawm bricks thaum lub sij hawm sintering txheej txheem, yog li ua rau tawg.
Secondly, thaum lub sij hawm sintering txheej txheem, yog hais tias qhov kub nce ceev heev los yog cov txheej txheem ziab yog tsis tsim nyog, cov dej noo nyob rau hauv siab alumina bricks yuav evaporate unevenly, ua rau ib tug teeb meem uas lub cev qhuav dej tus nqi ntawm cov npoo yog ntau dua li ntawm nruab nrab. Nyob rau lub sijhawm no, cov dej ntawm cov npoo evaporates sai heev, thaum cov dej hauv nruab nrab evaporates qeeb dua, ua rau cov npoo ntawm cov cib qis heev, ua rau tawg. Tsis tas li ntawd, kev tswj ntawm sintering kub kuj tseem ceeb heev. Yog tias qhov kub thiab txias dhau los yog qis dhau, cov qauv sab hauv ntawm lub cib yuav tsis ruaj khov thiab tawg yuav tshwm sim.
Tsis tas li ntawd, cov yam ntxwv xws li kev tsim cov pwm pwm, kev sib txuam ntawm cov ntaub, kev ua haujlwm kev txawj ntse, thiab kev sib sau siab yuav cuam tshuam rau qhov zoo ntawm cov cib. Yog tias cov pwm tsim tsis tsim nyog thiab tsis muaj qhov grooves lossis qhov qhov cua, cov pa roj hauv lub cev tsis tuaj yeem raug tso tawm thaum lub sij hawm molding, uas ua rau tawg thaum lub sij hawm sintering. Nyob rau tib lub sijhawm, kev faib tsis sib xws lossis kev ua haujlwm tsis raug yuav ua rau muaj kev ntxhov siab tsis sib xws hauv lub cev cib, ua rau tawg.
2: Yog vim li cas rau kev tsim
Ua ntej tshaj plaws, kev tsim cov pwm tsim muaj kev txiav txim siab ntawm qhov zoo ntawm alumina cib. Rau cov pwm nyuaj nrog qhov, nplaig, grooves lossis cov ces kaum, cov qauv tsim yuav tsum tsim nyog kom tsis txhob muaj cov kab nrib pleb los ntawm cov teeb meem ntawm cov pwm thaum lub sij hawm molding txheej txheem. Yog hais tias muaj ntau tus nplaig thiab grooves thiab ntau lub pwm sab saud yog qhov nyuaj rau kev tsim, nws yuav tsum tau txiav txim siab thiab ua kom zoo dua thaum tsim pwm.
Tsis tas li ntawd, qhov tso pa tawm ntawm cov pwm kuj tseem ceeb. Yog tias cov pwm tsim tsis muaj qhov grooves thiab qhov qhov cua, cov roj av sab hauv ntawm cov cib yuav tsis raug tso tawm kom zoo thaum lub sij hawm molding, ua rau tawg tom qab pwm tso tawm. Yog li ntawd, nws yog ib qho tsim nyog los xyuas kom meej qhov tso pa tawm zoo meej thaum tsim cov pwm kom tsis txhob muaj teeb meem tawg los ntawm kev khaws roj.
Distribution uniformity kuj yog ib qho tseem ceeb cuam tshuam rau qhov zoo ntawm alumina cib. Kev faib tawm tsis sib xws yuav ua rau muaj qhov tsis sib xws hauv lub cev cib, uas yuav ua rau muaj kev ntxhov siab thaum lub sijhawm molding txheej txheem thiab ua rau tawg. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum nruj me ntsis tswj qhov uniformity ntawm raw cov ntaub ntawv thaum lub sij hawm faib txheej txheem los xyuas kom meej tias qhov ceev ntawm txhua feem ntawm lub cib lub cev yog zoo ib yam.
Kev txawj ua haujlwm thiab kev tswj lub siab kuj yog qhov tseem ceeb ntawm cov txheej txheem molding. Kev ua haujlwm tsis raug lossis tsis tsim nyog yuav ua rau lub zog tsis sib xws ntawm lub cev cib, ua rau tawg. Yog li ntawd, cov neeg ua haujlwm yuav tsum muaj qee yam kev txawj ntse thiab kev paub dhau los txhawm rau tswj hwm ntau yam tsis zoo thaum lub sijhawm molding txheej txheem kom ntseeg tau tias qhov zoo ntawm alumina cib zoo yog ruaj khov thiab txhim khu kev qha.
Thaum kawg, lub zog ntawm txhua lub rauj thaum molding kuj yuav tsum tau tswj kom meej. Cov hammering ntau dhau yuav ua rau cov roj hauv lub cib tsis tuaj yeem tso tawm tag nrho, ua rau muaj kev sib kis thiab sib kis. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum nruj me ntsis tswj cov hammering siv thiab zaus thaum lub sij hawm molding txheej txheem los xyuas kom meej tias cov roj nyob rau hauv lub cib yuav smoothly tawm thiab zam qhov tshwm sim ntawm cov kab nrib pleb.
Peb: Yog vim li cas hlawv
Ua ntej ntawm tag nrho cov, cov cua kub tus nqi yog ib tug ntawm cov tseem ceeb yam uas cuam tshuam qhov zoo ntawm high alumina bricks. Yog tias qhov kub thiab txias siab dhau lawm, qhov ntsuas kub ntawm qhov nruab nrab ntawm sab hauv thiab sab nraud ntawm lub cib yuav nce ntxiv, ua rau tsis sib xws kev ntxhov siab thiab tawg. Yog li ntawd, thaum lub sij hawm tua hluav taws, tus nqi cua sov yuav tsum tau tswj nruj me ntsis kom ntseeg tau tias cov bricks yog rhuab sib npaug.
Qhov thib ob, atmospheric tej yam kev mob kuj muaj feem xyuam rau qhov zoo ntawm bricks. Thaum lub sij hawm tua hluav taws, oxidizing lossis txo qhov xwm txheej ntawm huab cua yuav cuam tshuam ncaj qha rau lub xeev valence thiab theem hloov txheej txheem ntawm cov ntsiab lus hauv cib, yog li cuam tshuam rau nws lub cev thiab tshuaj lom neeg stability. Yog tias cov huab cua tsis tsim nyog, qhov tsis xws luag lossis tsis tiav theem kev hloov pauv tuaj yeem tshwm sim hauv cov cib, ua rau tawg.
Tsis tas li ntawd, qhov shrinkage ntawm lub cev ntsuab thaum lub sij hawm tua hluav taws kuj yog ib qho tseem ceeb ntawm cov kab nrib pleb. Vim lub complex muaj pes tsawg leeg ntawm siab alumina cib, muaj qhov sib txawv ntawm thermal expansion coefficients thiab shrinkage tus nqi ntawm txhua yam, yog li tsis sib xws shrinkage yuav tshwm sim thaum lub sij hawm firing txheej txheem. Yog tias qhov shrinkage loj dhau los yog tsis sib xws, nws yuav ua rau tawg ntawm lub cib.
Thaum kawg, theem nrab mullite-corundum recrystallization yog ib theem tseem ceeb hauv kev tua hluav taws. Thaum lub sij hawm no, cov ntxhia theem nyob rau hauv lub cib hloov pauv thiab recrystallization, uas ua rau lub ntim hloov. Yog tias cov txheej txheem no tsis raug tswj kom raug, cov kab nrib pleb tuaj yeem tshwm sim.
Txhawm rau txo qhov kev pheej hmoo ntawm cov kab nrib pleb hauv siab alumina cib thaum lub sijhawm tua, kev ua kom zoo thiab kev txhim kho yuav tsum tau ua los ntawm ntau yam xws li kev xaiv raw khoom, qauv tsim, thiab kev tswj cov txheej txheem.
