Izitini eziphakeme ze-alumina zohlobo olusha lwe-lime

Okwesibili isitini esiphakeme se-alumina uhlobo oluthile lokuphikiswa, ingxenye eyinhloko yalesi sitini esikhanyisayo yi-Al2O3.

Uma okuqukethwe kwe-Al2O3 kuphakeme kuno-90%, kubizwa ngokuthi isitini se-corundum. Ngenxa yezinsizakusebenza ezahlukahlukene, amazinga kazwelonke awahambisani ngokuphelele. Isibonelo, amazwe ase-Europe abeka umkhawulo ophansi wokuqukethwe kwe-Al2O3 kuma-refractories aphezulu e-alumina kuma-42%. E-China, ngokuya ngokuqukethwe kwe-Al2O3 kuzitini eziphakeme ze-alumina, kuvame ukuhlukaniswa ngamabanga amathathu: Okuqukethwe kweBanga I──Al2O3> 75%; Okuqukethwe kweBanga II──Al2O3 kungama-60 ～ 75%; Okuqukethwe kweBanga lesi-III──Al2O3 ngama-48 ～ 60%.

isici

a. Ukubuyiselwa emuva

Ukuphindwa kwezitini eziphakeme ze-alumina kuphakeme kunezitini zobumba nezitini ezinesi-silica, kufinyelela ku-1750 ~ 1790 ℃, okuyizinto ezisezingeni eliphakeme zokuphikisa.

b. Layisha ukushisa kokuthambisa

Ngenxa yokuthi imikhiqizo ene-alumina ephezulu ine-Al2O3 ephezulu, ukungcola okuncane, kanye nemizimba yeglasi engabumbeki kangako, izinga lokushisa lokuthambisa umthwalo liphakeme kunalelo lezitini zobumba. Kodwa-ke, ngoba amakristalu e-mullite awenzi isakhiwo senethiwekhi, izinga lokushisa lokuthambisa umthwalo alikaphakeme njengalelo lezitini ze-silica.

c. Ukumelana kweSlag

Izitini eziphakeme ze-alumina zine-Al2O3 eningi, esondelene nezinto zokwakha ezingathathi hlangothi, futhi ingamelana nokuguguleka kwe-slag ene-acid ne-alkaline slag. Ngenxa yokufakwa kwe-SiO2, amandla okumelana ne-alkaline slag abuthakathaka kunalawo we-acidic slag.

ukusetshenziswa

Ikakhulu esetshenziselwa ulwelwesi lwamafutha okuqhuma, amalahle ashisayo okuqhuma, izithando zomlilo kagesi, iziko lokuqhumisa, izithandani ezivuselelayo kanye nezikhuni ezijikelezayo. Ngaphezu kwalokho, izitini eziphakeme ze-alumina nazo zisetshenziswa kabanzi njengezitini ezihlola imigwaqo evulekile, amapulagi wokuthela amasistimu, izitini zombhobho, njll. Nokho, intengo yezitini eziphakeme ze-alumina iphakeme kunaleyo yezitini zobumba, ngakho-ke akudingekile ukusebenzisa izitini eziphakeme ze-alumina lapho izitini zobumba zingahlangabezana nezidingo.

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