Polycrystalline mullite plaub tsiaj

Cov txheej txheem tsim khoom ntawm polycrystalline fiber ntau yog txawv nyob rau hauv cov tshuaj lom neeg muaj pes tsawg leeg los ntawm ib95 thiab A80. Nws yog tshuaj lom tau sib npaug raws li tsim ib qho siv lead ua mullite (3al₂0₃· 4Sia₂, 3A2s), thiab sib zog siv kom txo kev siv hluav taws xob tsawg, tshwj xeeb yog qhov ntsuas hluav taws xob tsawg kawg nkaus ntawm qhov kub thiab txias, thaum lub sijhawm ua haujlwm.

Crystal fiber ntau cov khoom tuaj yeem faib ua A72, A80 thiab A95 raws li qhov sib txawv₂O₃cov ntsiab lus. Cov kev xaiv uas cov ntsiab lus kom muab tso rau hauv kev tsim khoom yuav tsum tau txiav txim siab los ntawm kev tshuaj xyuas ntau yam thiab cov xwm txheej:

1.Qhov tseem ceeb Crystal theem ntawm A95 yog -al₂O₃thiab ib qho me me ntawm mullite thiab θ-al₂O₃, lub ntsiab tseem ceeb ua ntu zus ntawm A80 yog mullite thiab ib qho me me ntawm θ-al₂O₃, thiab lub ntsiab crystal theem ntawm A72 yog ib leeg mullite. Kev xam cov kev ntsuas kub thiab crystallization ntawm peb cov fibers yog qhov sib txawv. A72 muaj qhov ntsuas kub tsawg thiab tsuas yog muaj theem ntawm mullite. A95 thiab A80 muaj kev xam kub siab thiab muaj ob-theem nplej. Hauv kev siv mus ntev, kev loj hlob ntawm mullite thiab -al₂O₃yog txawv, thiab txoj kev loj hlob ntawm -al₂O₃yog ntau ntau ntau dua li mullite.

2.Qhov tseeb tshwj xeeb lub ntiajteb txawj nqus ntawm -AL₂O₃Yog 3.4, thiab qhov tseeb kev sib tsoo ntawm mullite yog 3. 0. Yog tias ob tus fibers nrog tib lub cheeb tsam yog tsim los ntawm ob cov ntaub ntawv no, tom kawg yog kwv yees li 12% ntau tshaj li yav dhau los ntawm qhov hnyav. Cov khoom lag luam ua los ntawm ob cov fibers muaj cov sib txawv tuab, porosities thiab thermal conductivity nyob rau tib lub ntim.

3.Yog cov hmoov txhuas yog siv ua cov khoom siv raw, tus nqi ntawm A95 fiber siv yog 19.2% ntau tshaj li ntawm A72, thiab lub zog tau siv cov khoom yuav ua kom haum.

Kev tsim cov polycrystalline mullite fiber ntau kuj saws cov qauv colloid, thiab nws cov tshuaj lom neeg muaj pes tsawg₂O₃72-75}%, sio₂25-28%. Nws cov hauv paus ntsiab lus tsim qauv yog los ua soluble aluminium thiab silicon ntsev rau hauv filmosity, thiab tom qab ntawd hloov mus rau hauv al-si ox ox oxide polycrystalline fiber ntau los ntawm kev kho cua sov.

Kev npaj ntawm collod

Qhov txheej txheem colloid yog qhov tseem ceeb los hloov cov ntsev ua kom tau txhuas, thiab tom qab ntawd ntxiv lwm cov muaju nrog cov viscosity siab thiab tsim muaj peev xwm. Raws li cov ntsiab cai no, Industrial-qeb Crystalline Aluminium Crystag nrho cov tshuaj txhuas tau xaiv los npaj ib qho kev daws teeb meem raws li A1 thiab C1. Cov kev daws teeb meem kev ua txhaum cai xws li cov tshuaj lom neeg thiab polymerization los tsim cov pob tshab thiab ruaj khov txhuas OxyChloride Inorganic dolegacic colloid-niam cawv. Txij li thaum cov khoom siv raw, txhuas chloride aque kua, yog cov xeb zoo, hlau tsis tuaj yeem siv tag nrho cov khoom siv. Tshwj xeeb, cov khoom siv ntawm cov thawv uas ua kom sov cov tshuaj txhuas chloride aque kua rau npau npau yog qhov tseem ceeb.

Raws li cov tshuaj lom neeg muaj pes tsawg leeg ntawm Mullite Crystal theem, nws yog ib qho tsim nyog los ntxiv cov kua nplaum kua nplaum npaj nrog silica gel rau cov kua cawv niam. Thaum npaj cov kua nplaum, kom tsis txhob muaj qhov tshwm sim ntawm colloidal gel thiab nag lossis daus, thiab tseem yuav ua rau inhibit qhov kev txhawb nqa ntawm sio₂Tom qab cov fiber ntau los ua ib theem siv lead ua, yog li ua cov Cristobalite thiab kev loj hlob ntau dhau los, qee cov organic acids tuaj yeem muab ntxiv. Cov npaj colloid yuav tau rhuab thiab feeb meej, thiab ib feem ntawm cov kuab tshuaj (dej feem ntau) yuav raug tshem tawm ntawm campos polymerization ncav tes ntsuas. Txhawm rau pab txhawb kev tswj hwm ntawm rheological cov yam ntxwv ntawm cov collegoid, ib qho nqi ntawm cov molecular siab polymer yuav tsum tau ntxiv rau cov kua nplaum tov. Vim tias cov kev daws teeb meem zoo ntau, ntev, nruj kev tswj hwm thaj chaw, thiab cov txheej txheem dav dav yuav tsum raug xaiv.

Tiag tiag

Fiberation yog tus yuam sij rau kev tsim cov polycrystalline mullite fiber ntau, thiab nws tseem yog qhov kev sib txuas nyuaj. Txhawm rau txhim kho qhov zoo ntawm fiber thiab txo cov pob tawg thiab suav, qhov ntsuas kub uas sov siab heev-tshuab hluav taws xob Ntawd yog, ua ntej muab cov npaj tawm hauv lub siab siab, thiab xa colloid mus rau qhov kev kub ceev tig disc los ntawm huab cua siab. Tom qab colloid yog centrifugally pov tseg, nws yog tshuab rau fiber los ntawm huab cua kub. Hauv cov txheej txheem txuas no, plaub txuas ntawm colloid viscosity, disc huab cua ntws kub thiab fiberyization ntau yam kev sib raug zoo, thiab tsis muaj ib qho ntawm lawv tuaj yeem ploj lawm.

Kev Ua Kom Qhuav Fiber Ntau, Kev Kho Cua Sov Thiab Kho

Cov txheej txheem fiber ntau tau muaj los ntawm cov txheej txheem fiber ntau muaj cov chaw loj thiab yooj yim heev kom nqus noo noo hauv huab cua thiab ua npuas ncauj. Yog li ntawd, nws yuav tsum tau qhuav sai sai, txwv tsis pub cov fibers yuav raug khi, ua rau cov khoom tawg thiab hmoov. Cov tshuaj fiber ntau yuav tsum yog cov tshuaj tiv thaiv cua sov tam sim ntawd tom qab ziab rau lub sij hawm cov tshuaj ions ion (c}|hauv cov roj txhuas kom dim. Hauv cov txheej txheem no, cov cua sov tus nqi yuav tsum tau nruj me ntsis tswj kom ntseeg tau tias cov qauv fiber ntau tsis raug rhuav tshem. Nyob rau hauv cov mob no, tus nqi cua sov ntawm kev kho cua sov tuaj yeem nce raws li cov cheeb tsam fiber ntau zuj zus. Thaum lub sij hawm kho cua sov, corrosive gases nrog ib tug kub (siab dua 500 degree) yuav tsum tau tsim tawm, uas yuav tsum tau xaiv cov khoom siv hluav taws xob.

Tom qab cov emburo fiber ntau tau dhau los ntawm ob qho txheej txheem ntawm ziab thiab kev kho cua sov, cov iav fiber uas ua rau ib txwm ua tiav cov khoom lag luam. Lub sijhawm no, cov fibers yuav tsis lo rau ib leeg. Cov khoom tiav tiav yog tom qab ntawd muab tso rau hauv qhov cub kom muaj kev kub ntxhov thiab yog rhaub raws li qhov kev nce kub los ua polycrystalline mullite fiber ntau.

Polycrystalline Mullite fiber ntau ntaub plaub (PMF) yog hom tshiab ntawm ultra-lub teeb siab-kub refractory fiber ntau. Nws yog ib qho ntawm tag nrho al₂O₃-Sio₂Ceramic fibers. Qhov ntsuas kub yog 1500-1700 degree, uas yog 200-400 degree siab dua li cov iav fiber ntau dua. Nws tuaj yeem yog siv dav hauv lub rwb thaiv tsev ntawm cov khoom siv hluav taws xob, cov khoom lag luam muaj peev xwm tiv thaiv cov nplaim dej, thiab lwm yam khoom lag luam, thiab siv tau cov tshuaj lom neeg muaj kuab lom, thiab muaj kuab lom

■ Tsawg Thermal conductivity;

■ Tsis muaj kev kub muaj peev xwm;

■ Zoo heev Thermal poob siab kuj;

■ Tshuaj Muaj Zog Zoo Tshaj;

■ Tsis muaj ib phau twg los yog lwm yam khoom noj khoom haus;

■ Tseem xoob thiab yoog raws elasticity zoo ntawm qhov kub.

■ Rwb thaiv tsev ntawm ntau qhov kev kub siab muaj huab cua sov;

Cov ntaub ntawv raw rau ua lwm cov polycrystalline mullite rwb thaiv tsev cov ntaub ntawv xws li cov laug cam, ntawv, thiab cov tshuab nqus.

Cim npe nrov: Polycrystalline Mullite Tsiaj, Tuam Tshoj Polycrystalline Mullite Wool Chaw Tsim Tshuaj, Chaw muag khoom, Hoobkas