Ngokuqhelekileyo, izitena eziphezulu ze-aluminium akufanele zisetyenziswe kwisithando somlilo se-alkaline. Ngenxa yokuba i-alkaline kunye ne-acidic medium nayo ine-chlorine, iya kungena kwiingqimba ezinzulu zezitena eziphezulu ze-alumina ngendlela ye-gradient, eya kubangela ukuba isitena esiphikisayo siwele.
Isitena esiphezulu se-aluminium emva kokukhukuliseka kwe-alkaline atmosphere kukuqhekeka okuthe tye. Ukhukuliseko luqulunqwe ngamafutha angwevu, iigesi ezivuthayo, kunye namalungu ealkaline kwezinye iimveliso. Ezi zixhobo zisabela ngesigaba seglasi kunye nelitye le-mullite kwisitena esiphezulu se-aluminium.
Izitena eziphezulu ze-aluminiyam ezine-alkaline ezigqwesiweyo ziya kubonakala phezu komhlaba. Ukutshisa i-gas compounds kuya kuvelisa i-nitrate ye-lure, i-sedimentation kwi-gap yezitena eziphezulu ze-aluminium; ukusabela komkhenkce owenziweyo kuya kwenza isigaba esitsha esintsonkothileyo. Xa i-nitriles enethamsanqa engenamanzi inxibelelana ne-vagram eyenziwe, i-anti-vaporization reaction iya kwenzeka, ibangele ukuba isitena esiphezulu se-aluminium siqhekeke okanye siwise. Ukongeza, i-thermal corrosion nayo iyingozi kakhulu kwi-refractory brick corrosion. Ngenxa yokukhukuliseka kwe-quartz ye-Fang, i-Skywine, kunye ne-quartz crystal silica. Ukusetyenziswa kweethayile zomlilo kuya kuba nzima ngakumbi kunee-noodle ezibandayo.
Umonakalo kwizitena ze-silicon dioxide nazo zibi kakhulu. I-silica inyibilika kwizitena eziphezulu ze-aluminiyam -isigaba solwelo. Ukunyibilika kwe-nitrate yethamsanqa kunye namatye e-silicon asezantsi-anyibilika enza umthamo omkhulu wesigaba solwelo. Ukuphakama komxholo we-silica kwisitena, ubuninzi besigaba se-liquid. Izigaba zolwelo ezigqithisileyo ziya kukhubaza izitena eziphezulu ze-aluminiyam. I-silicon ye-silicon yonakaliswe kwizitena. Ngenxa yokuba i-silica yamahhala isetyenzisiwe, isigaba se-Mo Lai Shi siya kuchithwa. Emva kokuphendula kwe-lickle nitrate kunye nelitye le-mullite kunokubangela ukwandiswa okutshabalalisayo kwezitena eziphezulu ze-aluminium.
Izitena eziphezulu ze-aluminiyam zinokuchasana okugqwesileyo kwiqondo lokushisa eliphezulu kunye ne-abrasion. Zisetyenziswa kakhulu kumaleko ahlukeneyo amaziko emizi-mveliso, anjengamaziko aqhumayo, iziko lomoya oshushu, kunye neetoni ezijikelezayo. Nangona kunjalo, kwisithando somlilo se-alkaline, ukusetyenziswa kwezitena eziphezulu ze-alumina zilinganiselwe.
Iimpawu zeekhemikhali zezitena eziphezulu ze-alumina zibenza baxhathise imiphumo yeendawo ezinobumuncu. Nangona kunjalo, kwindawo ene-alkaline kakhulu, njengezitena ze-samente okanye izitofu zeglasi, izitena eziphezulu ze-aluminium ziya kusabela nge-alkali oxides yensimbi, ebangela ukuba izitena ziqhekeke kwaye zidibanise. Ukusabela phakathi kwezitena ze-Al2O3 kunye ne-alkali yensimbi oxides ngokuqhelekileyo kubangela ukubunjwa kwe-alkali aluminosilicate gel, enendawo ephantsi yokunyibilika kwaye inokuhamba ngokulula kwiintanda.
Ukusombulula le ngxaki, izicwangciso ezininzi zisetyenzisiwe ukuphucula ukuchasana kwezitena eziphezulu ze-aluminium kwiindawo ze-alkaline. Esinye isisombululo kukongeza i-magnesia okanye i-spinel kwizitena eziphezulu ze-alumina. I-magnesia okanye i-spinel iya kusabela kunye ne-alkali metal oxides ukwenza izigaba ezizinzile ze-spinel, ezinokunyusa ukuchasana kwezitena ze-Al2O3 ekuqhekekeni okubangelwa yi-alkali reaction. Esinye isisombululo kukusebenzisa isigqubuthelo esikhuselayo kumphezulu wezitena eziphezulu ze-alumina ukukhusela ukudibanisa ngokuthe ngqo kwindawo ye-alkali.
Isishwankathelo, izitena eziphakamileyo ze-aluminiyam zinokusebenza okulinganiselweyo kwi-alkaline atmosphere i-industrial furnace lining. Ukwandisa ukuchasana kwezitena ze-Al2O3 kwiindawo ze-alkaline, kuyimfuneko ukongeza iiminerali ezithile okanye iingubo ukuze ugweme ukusabela okuyingozi kunye ne-alkali metal oxides. Kubalulekile ukuba ukhethe imathiriyeli efanelekileyo yelayini yesithando somlilo ukunciphisa iingozi ezinokubakho kunye nokugcina iindleko.
Ixesha lokuposa: May-19-2023
