Ngokubanzi, izitena ze-aluminium eziphezulu akufuneki zisetyenziswe kwi-oven ye-alkaline atmosphere. Ngenxa yokuba i-alkaline kunye ne-acidic medium nazo zine-chlorine, iya kungena kwiingqimba ezinzulu zezitena ze-alumina eziphezulu ngendlela ye-gradient, eya kubangela ukuba izitena ezichaseneyo zidilike.
Isitena se-aluminiyam ephezulu emva kokukhukuliseka komoya we-alkaline siqhekeka ngokuthe tye. Ukukhukuliseka kwenziwa yi-fuel grey, iigesi ezitshayo, kunye nezinto ze-alkaline kwezinye iimveliso. Ezi zinto zisabela kwi-glass phase kunye ne-mullite stone kwi-aluminium ephezulu.
Izitena ze-aluminium ephezulu ezine-alkaline ebolileyo ziya kuvela phezu komhlaba. Iikhompawundi zegesi ezitshayo ziya kuvelisa i-lure nitrate, i-sedimentation kwisithuba sezitena ze-aluminium ephezulu; ukusabela kweqhwa elivelisweyo kuya kwenza isigaba esitsha esintsonkothileyo. Xa ii-nitriles ezingenamanzi zidibana ne-vagram evelisweyo, kuya kwenzeka i-anti-vaporization reaction, nto leyo ebangela ukuba izitena ze-aluminium ephezulu ziqhekeke okanye ziwe. Ukongeza, i-thermal corrosion nayo iyingozi kakhulu kwi-refractory blade corrosion. Ngenxa yokukhukuliseka kwe-Fang quartz, i-Skywine, kunye ne-quartz crystal silica. Ukusetyenziswa kweethayile zomlilo kuya kuba yingozi ngakumbi kunee-noodles ezibandayo.
Umonakalo kwizitena ze-silicon dioxide nawo unzima kakhulu. I-silica iyanyibilika kwisigaba se-aluminium brick-liquid. I-nitrate enyibilikayo kunye namatye e-silicon asezantsi anyibilikayo enza inani elikhulu lesigaba se-liquid. Okukhona umxholo we-silica uphezulu kwisitena, kokukhona inani lesigaba se-liquid liphezulu. Izigaba ze-liquid ezigqithisileyo ziya kutshintsha izitena ze-aluminium eziphezulu. I-silicon ye-silicon nayo yonakala kwizitena. Ngenxa yokuba i-silica ekhululekileyo iyasetyenziswa, isigaba se-Mo Lai Shi siya kubola. Emva kwempendulo ye-lickle nitrate kunye ne-mullite stone kunokubangela ukwanda okutshabalalisayo kwezitena ze-aluminium eziphezulu.
Izitena ze-aluminium ephezulu zinokumelana kakuhle nobushushu obuphezulu kunye nokukrala. Zisetyenziswa kakhulu kwi-lining ye-ovens ezahlukeneyo zoshishino, ezifana ne-blast ovens, i-hot air ovens, kunye ne-rotary ovens. Nangona kunjalo, kwi-alkaline atmosphere ye-industrial oven, ukusetyenziswa kwezitena ze-alumina eziphezulu kulinganiselwe.
Iimpawu zeekhemikhali zezitena ze-alumina eziphezulu zizenza zikwazi ukumelana neemeko ze-asidi. Nangona kunjalo, kwindawo ene-alkaline eninzi, njengee-oven zesamente okanye ii-oven zeglasi, izitena ze-aluminiyam eziphezulu ziya kusabela kwi-alkaline metal oxides, nto leyo ebangela ukuba izitena ziqhekeke kwaye ziqhekeke. Ukusabela phakathi kwezitena ze-Al2O3 kunye ne-alkaline metal oxides kudla ngokuphumela ekwakhiweni kwejeli ye-alkaline aluminosilicate, ene-melting point ephantsi kwaye inokugeleza ngokulula kwiimfanta.
Ukusombulula le ngxaki, kuye kwasetyenziswa amaqhinga amaninzi ukuphucula ukumelana kwezitena ze-aluminium eziphezulu kwiindawo ezine-alkaline. Esinye isisombululo kukongeza i-magnesia okanye i-spinel kwizitena ze-alumina eziphezulu. I-magnesia okanye i-spinel iya kusabela kunye ne-alkali metal oxides ukwenza ii-spinel phases ezizinzileyo, ezinokunyusa ukumelana kwezitena ze-Al2O3 ekuqhekekeni okubangelwa kukusabela kwe-alkali. Esinye isisombululo kukufaka i-coating yokukhusela kumphezulu wezitena ze-alumina eziphezulu ukuthintela ukudibana ngqo nendawo ene-alkaline.
Ngamafutshane, izitena ze-aluminium eziphezulu zinokusetyenziswa okulinganiselweyo kwi-alkaline atmosphere ye-furnace yemizi-mveliso. Ukuphucula ukumelana kwezitena ze-Al2O3 kwiindawo ze-alkaline, kuyimfuneko ukongeza iiminerali ezithile okanye ii-coating ukuze kuthintelwe iimpembelelo ezinobungozi kwi-alkaline metal oxides. Kubalulekile ukukhetha izinto ezifanelekileyo kwi-furnace yemizi-mveliso ukunciphisa iingozi ezinokubakho kunye nokonga iindleko.
Ixesha lokuthumela: Meyi-19-2023
