Li-castable tse tlaase tsa samente tse refractory li bapisoa le li-castable tse tloaelehileng tsa aluminate samente. Palo ea keketso ea samente ea liphahlo tsa khale tsa samente tsa aluminium tse refractory hangata ke 12-20%, 'me kakaretso ea metsi ke 9-13%. Ka lebaka la metsi a mangata a ekelitsoeng, 'mele oa cast o na le li-pores tse ngata, ha o teteane ebile o na le matla a fokolang; ka lebaka la palo e kholo ea samente e ekelitsoeng, le hoja matla a phahameng a tloaelehileng le a tlaase a mocheso a ka fumanoa, matla a fokotseha ka lebaka la phetoho ea crystalline ea calcium aluminate ka mocheso o mahareng. Ho hlakile hore CaO e hlahisitsoeng e sebetsana le SiO2 le Al2O3 ka har'a mochini ho hlahisa lintho tse tlase tse qhibilihang, tse bakang ho senyeha ha thepa ea mocheso o phahameng.
Ha theknoloji ea phofo ea ultrafine e sebelisoa, li-admixtures tse sebetsang hantle haholo le likaroloana tsa saense li sebelisoa, lihlahisoa tsa samente li fokotsehile ho ea ka tlase ho 8% 'me metsi a fokotsehile ho ≤7%,' me letoto le tlaase la samente le ka khonang e lokisitsoeng le ho tlisoa ka har'a The CaO content ke ≤2.5%, 'me matšoao a eona a tshebetso ka kakaretso a feta a aluminate samente refractory castables. Mofuta ona oa refractory castable o na le thixotropy e ntle, ke hore, thepa e tsoakiloeng e na le sebōpeho se itseng 'me e qala ho phalla ka matla a seng makae a ka ntle. Ha matla a ka ntle a tlosoa, a boloka sebopeho se fumanoeng. Ka hona, e boetse e bitsoa thixotropic refractory castable. Self-flowing refractory castable e boetse e bitsoa thixotropic refractory castable. Ke ea sehlopha sena. Moelelo o nepahetseng oa li-castable tse fokolang tsa samente ha o so hlalosoe ho fihlela joale. The American Society for Testing and Materials (ASTM) e hlalosa le ho arola li-castable tse hanyetsang ho latela litaba tsa bona tsa CaO.
Letenya le matla a phahameng ke likarolo tse hlahelletseng tsa letoto le tlase la samente ea refractory castables. Sena se molemo bakeng sa ho ntlafatsa bophelo ba ts'ebeletso le ts'ebetso ea sehlahisoa, empa se boetse se tlisa mathata ho baka pele se sebelisoa, ke hore, ho tšela ho ka etsahala habonolo haeba u sa hlokomele nakong ea ho baka. Ketsahalo ea ho phatloha ha 'mele e ka hloka hore ho tšeloe hape bonyane, kapa e ka beha ts'ireletseho ea botho ea basebetsi ba potolohileng maemong a boima. Ka hona, linaha tse fapaneng li boetse li entse lithuto tse fapaneng mabapi le ho baka li-castable tsa samente tse tlase tsa samente. Mehato e ka sehloohong ea tekheniki ke: ka ho etsa li-curve tse loketseng tsa ontong le ho hlahisa li-anti-explosion agents tse babatsehang, joalo-joalo, sena se ka etsa hore refractory castables Metsi a felisoe hantle ntle le ho baka litla-morao tse ling.
Theknoloji ea phofo ea Ultrafine ke thekenoloji ea bohlokoa bakeng sa li-castable tsa samente tse tlaase (hajoale boholo ba phofo ea ultrafine e sebelisoang ka ceramics le thepa ea refractory ha e le hantle e pakeng tsa 0.1 le 10m, 'me haholo-holo e sebetsa e le li-accelerator tsa ho hasana le li-densifiers tsa meralo. likaroloana samente haholo qhalakantsoeng ntle flocculation, ha a ntse a ho qetela etsa hore micropores ka 'mele aa tšela ka botlalo tlala le ho ntlafatsa matla.
Hona joale mefuta e sebelisoang ka tloaelo ea ultrafine powders e kenyelletsa SiO2, α-Al2O3, Cr2O3, joalo-joalo Sebaka se khethehileng sa SiO2 micropowder se ka bang 20m2 / g, 'me boholo ba eona bo ka bang 1/100 ea boholo ba samente, kahoo e na le molemo. ho tlatsa thepa. Ho phaella moo, SiO2, Al2O3, Cr2O3 micropowder, joalo-joalo e ka boela ea etsa likaroloana tsa colloidal metsing. Ha dispersant le teng, e overlaping motlakase habeli lera thehoa holim'a likaroloana ho hlahisa repulsion electrostatic, e leng hlōla van der Waals matla pakeng tsa likaroloana le ho fokotsa segokanyimmediamentsi sa sebolokigolo matla. E thibela adsorption le flocculation pakeng tsa likaroloana; ka nako e ts'oanang, dispersant e adsorbed ho pota-pota likaroloana ho etsa lera la ho qhibiliha, e leng ho eketsang metsi a marang-rang. Hona hape ke e 'ngoe ea mekhoa ea phofo ea ultrafine, ke hore, ho eketsa phofo ea ultrafine le li-dispersants tse loketseng ho ka fokotsa tšebeliso ea metsi ea li-castable tse refractory le ho ntlafatsa metsi.
Tlhophiso le ho thatafala ha li-castable tse tlaase tsa samente ke phello ea ketso e kopantsoeng ea hydration bonding le cohesion bonding. The hydration le ho thatafala ha calcium aluminate samente ke haholo-holo hydration ea hydraulic phases CA le CA2 le ts'ebetso ea kholo ea kristale ea hydrates ea bona, ke hore, ba itšoara ka metsi ho etsa li-hexagonal flake kapa CAH10, C2AH8 le lihlahisoa tsa Hydration tse joalo. joalo ka likristale tsa C3AH6 tsa cubic le li-gels tsa Al2O3аq ebe li theha sebopeho sa marang-rang sa condensation-crystallization nakong ea ho folisa le ho futhumatsa. The agglomeration le bonding ke ka lebaka la mafolofolo SiO2 ultrafine phofo ho etsa colloidal likaroloana ha e kopana le metsi, 'me e kopana le ions butle-butle dissociated ho tswa ho phaella ka ho re (ke hore electrolyte ntho). Hobane litefello tse ka holimo tsa tse peli li fapane, ke hore, bokaholimo ba colloid bo na le li-ion tsa adsorbed counter, tse bakang £ 2 Monyetla o fokotseha 'me condensation e etsahala ha adsorption e fihla "isoelectric point". Ka mantsoe a mang, ha repulsion electrostatic holim'a likaroloana colloidal ke ka tlaase ho moo khoheli, tlamahano e momahaneng etsahala ka thuso ea van der Waals matla. Ka mor'a hore "refractory castable" e kopantsoeng le phofo ea silika e fokotsehe, lihlopha tsa Si-OH tse entsoeng holim'a SiO2 li omisitsoe 'me li feletsoe ke metsi ho borokho, li etsa sebopeho sa marang-rang sa siloxane (Si-O-Si), kahoo se thatafatsa. Sebakeng sa marang-rang sa siloxane, maqhama pakeng tsa silicon le oksijene ha a fokotsehe ha mocheso o ntse o eketseha, kahoo matla a boetse a tsoela pele ho eketseha. Ka nako e ts'oanang, ka mocheso o phahameng, mohaho oa marang-rang oa SiO2 o tla itšoara ka Al2O3 e phuthetsoe ho eona ho etsa mullite, e ka ntlafatsang matla ka mocheso o bohareng le o phahameng.
Nako ea poso: Feb-28-2024
