Kev faib tawm ntawm Aluminium Silicate Refractories

Cov khoom siv thermal rwb thaiv tsev hais txograu cov khoom siv los yog cov khoom siv siv rau lub tsev lub hnab ntawv lossis cov khoom siv thermal, impedance tshav kub hloov pauv, suav nrog cov khoom siv thermal rwb thaiv tsev thiab cov khoom txias txias. Ntawm ib sab, cov ntaub ntawv thermal rwb thaiv tsev ua tau raws li qhov chaw thermal ntawm lub tsev lossis cov khoom siv thermal, thiab ntawm qhov tod tes, lawv kuj txuag lub zog. Yog li ntawd, qee lub tebchaws suav cov ntaub ntawv rwb thaiv tsev yog "thib tsib lub zog" tom qab thee, roj, nkev thiab hluav taws xob nuclear. Nws muaj qhov muaj zog impedance cuam tshuam rau cov cua sov ntws, thiab feem ntau yog siv rau kev rwb thaiv tsev thiab rwb thaiv tsev ntawm phab ntsa, ru tsev lossis cov kav dej thiab cov qhov cub hauv tsev.
Raws li lub hauv paus ntsiab lus ntawm rwb thaiv tsev, nws muab faib ua:
① Cov khoom ntxeem tau. Kev rwb thaiv tsev yog ua tiav los ntawm kev sau cov pores nrog cov pa roj nrog cov thermal conductivity tsawg. Feem ntau, huab cua yog siv los ua qhov nruab nrab ntawm thermal resistance, uas feem ntau yog cov qauv fiber ntau thiab cov khoom siv ntxeem tau. Cov rwb thaiv tsev ntawm cov npuas dej zoo dua, ua raws li cov ntxhia fibers (xws li asbestos), nthuav dav perlite thiab ntxeem tau pob zeb, ua npuas ncauj iav thiab lwm yam.
② Reflective khoom. Yog tias cov ntawv txhuas tuaj yeem txo cov hluav taws xob hloov hluav taws xob los ntawm thermal reflection, ob peb txheej ntawm aluminium ntawv ci los yog cov qauv sib xyaw nrog cov cua nyias txheej nrog ntawv tuaj yeem ua rau cov nqi thermal kuj nce. Cov ntaub ntawv rwb thaiv tsev thermal feem ntau yog siv los ntawm cov ntaub ntawv xoob, coils, cov ntawv txheeb thiab prefabricated blocks rau thermal rwb thaiv tsev thiab rwb thaiv tsev ntawm lub tsev ru tsev, sab nrauv phab ntsa thiab cov plag tsev. Nws tuaj yeem muab tso ncaj qha (xws li cov pob zeb aerated) los yog muab tso rau hauv lub ru tsev thiab lub hnab ntawv qauv raws li cov khoom tseem ceeb, los yog nws tuaj yeem ua rau hauv av rwb thaiv tsev txheej. Cov fiber ntau aluminium-silicon refractory yog refractory nrog Al2O3 thiab SiO2 raws li cov tshuaj lom neeg muaj pes tsawg leeg. Nws tuaj yeem raug cais raws li cov ntxhia muaj pes tsawg leeg, tshuaj lom neeg muaj pes tsawg leeg thiab cov txheej txheem tsim khoom ntawm cov khoom siv raw. Rau cov khoom lag luam feem ntau ua los ntawm cov khoom siv raw, raws li tus nqi ntawm Al2O3 thiab SiO2 cov ntsiab lus hauv cov khoom, nws tuaj yeem muab faib ua peb pawg:
Semi-silicon khoom:Al2O3cov ntsiab lus yog 15 ~ 30%;
Cov khoom siv av nplaum: Al2O3 cov ntsiab lus yog 30 ~ 46% (raws li cov yam ntxwv ntawm Tuam Tshoj cov khoom siv raw, feem ntau 30 ~ 48%);
Cov khoom lag luam siab aluminium: Al2O3 cov ntsiab lus ntau dua 46% (raws li cov yam ntxwv ntawm Tuam Tshoj cov ntaub ntawv raw, feem ntau> 48%).
Semi-siliceous cov khoom yog ua los ntawm semi-siliceous adhesive, thawj kaolin los yog wax pob zeb thiab lwm yam raw cov ntaub ntawv, yog li nws cov ntsiab lus Al2O3 yog tsawg, tsis ntau tshaj 30%. Cov khoom siv av nplaum yog tsim los ntawm fireclay ua cov khoom siv tseem ceeb, thiab qee cov av nplaum hlawv cov ntaub ntawv uas paub tab yog hloov mus rau hauv cov khoom siv granular, uas yog ua ke nrog qee cov av nplaum. Cov khoom siv aluminium siab tuaj yeem ua los ntawm ntau yam khoom siv aluminium siab nrog Al2O3 cov ntsiab lus ntau dua 46%. Cov khoom lag luam siab aluminium ua nrog ntuj siab bauxite raws li lawv cov ntsiab lus Al2O3 sib txawv, tuaj yeem muab faib ua I (Al2O3 Ntau dua lossis sib npaug li 75%), II (Al2O360% ~ 75%), III (Al2O348% ~ 60%) ntau yam cov khoom ntawm chemical extension muaj pes tsawg leeg.
Yog hais tias cov khoom yog cov yam ntxwv ntawm lub ntsiab raw khoom, cov khoom kuj tseem muaj npe los ntawm lub npe ntawm cov khoom siv raw. Piv txwv li, cov khoom tsim nrog waxite raws li cov khoom siv tseem ceeb yog hu ua waxite cib, thiab cov khoom tsim nrog sillimanite los yog andalusite ua cov khoom siv tseem ceeb yog hu ua sillimanite cib thiab andalusite cib. Yog tias cov khoom tsim nrog cov khoom siv dag zog (xws li sintered corundum, fused corundum, hluavtaws mullite) ua cov khoom siv tseem ceeb, nws raug cais raws li lub ntsiab siv lead ua theem hauv cov khoom. Xws li mullite cib, corundum mullite cib.

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