A na-atụnyere ihe nkedo nke simenti dị ala na nke omenala aluminate ciment refractory castables. Ọnụ ego mgbakwunye ciment nke ihe nkedo aluminate ciment refractory omenala na-abụkarị 12-20%, na mgbakwunye mmiri na-abụkarị 9-13%. N'ihi nnukwu mmiri agbakwunyere, ihe nkedo ahụ nwere ọtụtụ pores, ọ bụghị oke, ma nwee ike dị ala; n'ihi nnukwu ciment agbakwunyere, ọ bụ ezie na enwere ike ịnweta ike nkịtị na obere okpomọkụ, ike na-ebelata n'ihi mgbanwe kristal nke calcium aluminate na okpomọkụ. N'ụzọ doro anya, CaO ewepụtara na-emeghachi omume na SiO2 na Al2O3 n'ime ihe nkedo ahụ iji mepụta ụfọdụ ihe na-agbaze dị ala, na-ebute mmebi nke ihe ndị nwere okpomọkụ dị elu.
Mgbe a na-eji teknụzụ ultrafine ntụ ntụ, admixtures na-arụ ọrụ dị elu na gradation nke sayensị, ọdịnaya ciment nke ihe nkedo ahụ na-ebelata ihe na-erughị 8% na mmiri na-ebelata ka ≤7%, na obere ciment usoro refractory castable nwere ike ịbụ. akwadoro ma webata na ọdịnaya CaO bụ ≤2.5%, na ngosipụta arụmọrụ ya n'ozuzu karịa nke aluminate cement refractory castables. Ụdị nkedo nke refractory nwere ezigbo thixotropy, ya bụ, ihe a gwakọtara agwakọta nwere ọdịdị ụfọdụ wee malite iji obere ike dị n'èzí na-asọba. Mgbe a na-ewepụ ike dị n'èzí, ọ na-ejigide ọdịdị enwetara. Ya mere, a na-akpọkwa ya thixotropic refractory castable. A na-akpọkwa castable refractory nke na-asọpụta onwe ya thixotropic refractory castable. Sonyere udi a. Akọwapụtabeghị kpọmkwem ihe nkedo simenti dị ala dị ala ka ọ dị ugbu a. American Society for Testing and Materials (ASTM) na-akọwa ma na-ekewa ihe nkedo refractory dabere na ọdịnaya CaO ha.
Okpokoro na ike dị elu bụ ihe pụtara ìhè n'ime ihe nkedo mgbanaka nke obere ciment. Nke a dị mma maka imeziwanye ndụ ọrụ na arụmọrụ nke ngwaahịa ahụ, mana ọ na-ewetakwa nsogbu na ịsa achịcha tupu ejiri ya, ya bụ, ịwụsa nwere ike ime ngwa ngwa ma ọ bụrụ na ị kpacharaghị anya n'oge ịsa mmiri. Ihe ngosi nke mgbawa ahụ nwere ike ịchọ ịwụgharị opekata mpe, ma ọ bụ nwere ike itinye nchekwa nke ndị ọrụ gbara ya gburugburu n'ihe egwu. Ya mere, mba dị iche iche emewokwa ọmụmụ ihe dị iche iche gbasara ịsa ihe nkedo na-eme ka obere ciment dị obere. Usoro teknụzụ bụ isi bụ: site n'ịmepụta akụkụ ọkụ nke ezi uche dị na ya na iwebata ihe ndị na-egbochi mgbawa dị mma, wdg, nke a nwere ike ime ka ihe nkedo refractory na-ekpochapụ mmiri nke ọma n'emeghị ka mmetụta ndị ọzọ.
Ultrafine ntụ ntụ technology bụ isi technology maka ala-ciment usoro refractory castables (ugbu a ọtụtụ n'ime ultrafine powders eji ceramik na refractory ihe bụ n'ezie n'etiti 0.1 na 10m, na ha tumadi na-arụ ọrụ dị ka dispersion accelerators na structural densifiers. simenti ahụ nke ukwuu chụsasịrị na-enweghị flocculation, mgbe nke ikpeazụ na-eme ka micropores na agbapụtara ahụ zuru ezu jupụta na mma ike.
Ugbu a na-ejikarị ụdị ultrafine powders na-agụnye SiO2, α-Al2O3, Cr2O3, wdg The kpọmkwem n'elu ebe SiO2 micropowder bụ banyere 20m2 / g, na urughuru size bụ banyere 1/100 nke ciment urughuru size, n'ihi ya, ọ nwere ezi mma. ihe njuputa. Tụkwasị na nke ahụ, SiO2, Al2O3, Cr2O3 micropowder, wdg nwekwara ike ịmepụta mkpụrụ ndụ colloidal na mmiri. Mgbe a dispersant bụ ugbu, ihe overlapping electric okpukpu abụọ oyi akwa na-guzobere n'elu nke ahụ na-n'ịwa electrostatic repulsion, nke meriri van der Waals ike n'etiti ahụ na-ebelata interface ike. Ọ na-egbochi adsorption na flocculation n'etiti ahụ; N'otu oge ahụ, a na-eme ka onye na-ekesa ihe dị n'akụkụ ihe ndị ahụ na-emepụta ihe na-eme ka ihe mgbaze na-eme ka ọ dịkwuo mma, nke na-eme ka mmiri nke ihe nkedo ahụ dịkwuo elu. Nke a bụkwa otu n'ime usoro nke ultrafine ntụ ntụ, ya bụ, ịgbakwunye ntụ ntụ ultrafine na ndị na-ekesa kwesịrị ekwesị nwere ike ibelata oriri mmiri nke ihe nkedo refractory ma melite fluidity.
Ntọlite na ike siri ike nke ihe nkedo na-eme ka ciment dị ala bụ nsonaazụ nke njikọ hydration bonding na njikọta ọnụ. hydration na hardening nke calcium aluminate ciment bụ tumadi hydration nke hydraulic Phase CA na CA2 na kristal uto usoro nke ha hydrates, ya bụ, ha na-emeghachi na mmiri na-etolite hexagonal flake ma ọ bụ agịga yiri CAH10, C2AH8 na Hydration ngwaahịa ndị dị otú ahụ. dị ka cubic C3AH6 kristal na Al2O3аq gels wee na-etolite njikọ njikọ condensation-crystalization netwọk Ọdịdị n'oge ọgwụgwọ na kpo oku usoro. The agglomeration na bonding bụ n'ihi na-arụ ọrụ SiO2 ultrafine ntụ ntụ na-akpụ colloidal ahụ mgbe ọ na-ezute mmiri, na-ezute ions ji nwayọọ nwayọọ kewapụrụ na mgbakwunye mgbakwunye (ie electrolyte ihe). N'ihi na ụgwọ elu nke abụọ ahụ dị iche, ya bụ, elu colloid emewo ka ion counter ion, na-eme ka £ 2 nwere ike belata na condensation na-eme mgbe mgbasa ozi ruru "ebe isoelectric". N'ikwu ya n'ụzọ ọzọ, mgbe mmechi nke electrostatic dị n'elu akụkụ nke colloidal dị ntakịrị karịa mmasị ya, njikọta ọnụ na-eme site n'enyemaka nke ike van der Waals. Mgbe a na-ekpochapụ ihe nkedo na-atụgharị na silica ntụ ntụ, ìgwè ndị Si-OH ndị e guzobere n'elu SiO2 na-akpọnwụ na mmiri na-ekpo ọkụ ruo n'àkwà mmiri, na-eme usoro netwọk siloxane (Si-O-Si), si otú ahụ na-esi ike. Na usoro netwọk siloxane, njikọ dị n'etiti silicon na oxygen adịghị ebelata ka okpomọkụ na-abawanye, ya mere ike na-aga n'ihu na-abawanye. N'otu oge ahụ, na okpomọkụ dị elu, usoro netwọk SiO2 ga-emeghachi omume na Al2O3 ọbọp na ya iji mepụta mullite, nke nwere ike imeziwanye ike na ọkara na okpomọkụ dị elu.
Oge nzipu: Feb-28-2024
