Lub teeb yuag refractory khoom tsuas yog tsim kom muaj ntau qhov pores hauv cov khoom siv los ua cov khoom siv hluav taws xob zoo dua. Kev taw qhia ntawm qhov pores yog qhov txuas tseem ceeb tshaj plaws hauv cov txheej txheem tsim khoom ntawm lub teeb refractories. Cov duab, qhov loj me, kev faib tawm thiab qhov pores yuav cuam tshuam rau kev ua haujlwm ntawm cov khoom.
Txoj kev tsim cov pores nyob rau hauv lub teeb yuag cov ntaub ntawv refractory yog feem ntau siv los ntawm kev ntxiv cov ntaub ntawv poob, uas yog ntxiv ib co ntawm cov organic tshuaj xws li ntoo chips, polystyrene, thee hmoov, coke, roj av coke, thiab lwm yam thaum cov ntaub ntawv refractory yog npaj. . Pore khoom, pore-forming khoom los yog pore-forming tus neeg sawv cev. Lawv hlawv tawm thaum lub sij hawm high-temperature kho ntawm raw cov ntaub ntawv thiab tsim pores. Cov hauv qab no feem ntau cuam tshuam nrog kev xaiv cov pore-forming tus neeg sawv cev thiab muaj kev cuam tshuam loj rau kev tsim cov khoom hnyav refractory nrog rau microstructure thiab kev ua haujlwm ntawm cov khoom:
Cov teeb meem kub hnyiab yuav tsum yooj yim kom hlawv tag nrho, thiab cov tshauv tshuav tom qab hlawv yuav tsum tsawg li tsawg tau.
Polystyrene ua npuas ncauj pob yog qhov yooj yim tshaj plaws los hlawv tawm ntawm txhua qhov kev siv cov pore-forming tshuaj. Tus neeg sawv cev foaming volatilizes, nws softens nyob ib ncig ntawm 80 degree, thiab lub ntim ntawm cov npuas npuas maj mam txo mus rau 1/40 ntawm nws thawj loj. Thaum txog 164 degree, polystyrene pib yaj. Thaum txog 316 degree, nws decomposes rau hauv carbon thiab hydrogen, uas hlawv tawm ntawm txog 576 degree thiab tawm qhov hws. Polystyrene Ua Npuas Pob yog ib qho zoo pore-ua tus neeg sawv cev vim tias nws tsis tshua muaj txiaj ntsig, uas ua rau cov khoom tsawg ntawm cov khoom siv tsawg.
Txawm hais tias sawdust muaj qhov zoo sib xws ntawm kev kub nyhiab li cov pob polystyrene, nws muaj qhov ntom ntom dua. Qhov loj ntawm cov charcoal residue uas tseem tshuav tom qab cov khoom tsis hloov pauv tau tag nrho volatilized yuav tsum tau hlawv ntawm qhov kub siab dua. Cov khoom siv lub porosity yuav txo qis thiab "dub cores" yuav tsim yog tias tus tsim pore tsis raug hlawv tag nrho. Qhov no yuav tiv thaiv qhov pores los ntawm kev tawm hauv cov khoom. Kev ua tau zoo ntawm cov khoom siv hluav taws xob hnyav nrog cov tub ntxhais dub tuaj yeem cuam tshuam los ntawm tag nrho cov tshuaj ntxiv uas hlawv tawm thaum siv.
2. Cov yam ntxwv ntawm cov khoom siv yuav cuam tshuam ntau dua los ntawm kev suav nrog cov teeb meem charred.
Cov ntaub ntawv uas tau hlawv tawm muaj qee qhov kev hloov pauv. Lub cev ntsuab uas tau npaj los ntawm lub siab molding yuav distort thaum nyob rau hauv siab thiab rebound thaum lub siab tso tawm, ua rau lawv xoob, tsis zoo, los yog puas. Polystyrene ua npuas ncauj pob yog qhov zoo tshaj plaws pore-forming agents thaum nws los txog rau lub cev compressed. Qhov tsawg kawg nkaus ntawm polystyrene npas kuj tseem ua rau nws yooj yim rau lawv kom ua rau kev faib khoom tsis sib xws sab hauv lub teeb ci ntsa iab refractory.
