Ukukhethwa kwe-silica sol coating kuya kuchaphazela ngokuthe ngqo uburhabaxa bomphezulu kunye nokuchaneka kwe-dimensionalutyalo mali. Iingubo ze-silica sol ngokubanzi zinokukhetha ngokuthe ngqo i-silica sol kunye neqhekeza elikhulu le-silica ye-30%. Inkqubo yokwaleka ilula kwaye ukusebenza kulula. Kwangaxeshanye, iqokobhe lokubumba eliveliswe ngokusebenzisa i-coating linamandla amakhulu, kwaye umjikelo wokwenza iqokobhe ungacuthwa.
I-silica sol iyisibophelelo esiqhelekileyo samanzi kunye nesakhiwo se-colloid ye-silicic. Sisisombululo se-polymer colloidal apho amasuntswana e-silica ahlakazeke kakhulu anyibilika emanzini. Iingqungquthela ze-colloidal zi-spherical kwaye zine-diameter ye-6-100 nm. Iinkqubo yotyalo-maliukwenza iqokobhe yinkqubo yegelling. Zininzi izinto eziphembelela i-gelation, ikakhulu i-electrolyte, i-pH, i-sol concentration kunye nobushushu. Kukho iintlobo ezininzi ze-silica sol zorhwebo, kwaye eyona isetyenziswayo yi-alkaline silica sol kunye nomxholo we-silica we-30%. Inkqubo yokwenza i-silica sol shell ilula. Inkqubo nganye ineenkqubo ezintathu: ukugquma, ukugalela isanti, nokomisa. Inkqubo nganye iphinda iphindwe kaninzi ukufumana igobolondo le-multilayer yobunzima obufunekayo.
Kukho iindlela ezimbini eziqhelekileyo zokuvelisa i-silica sol: utshintshiselwano lwe-ion kunye nokuchithwa. Indlela yokutshintshiselana nge-ion ibhekisela kutshintshiselwano lwe-ion lweglasi yamanzi ehlanjululweyo ukususa i-ion zesodium kunye nobunye ukungcola. Emva koko isisombululo siyahluzwa, sifudunyezwe kwaye sigxininiswe kubuninzi obuthile ukufumana i-silica sol. Indlela yokuchithwa ibhekisela ekusebenziseni i-silicon ecocekileyo yezoshishino (iqhekeza elikhulu le-silicon ≥ 97%) njengento eluhlaza, kwaye phantsi kwesenzo se-catalyst, ichithwa ngokuthe ngqo emanzini emva kokufudumeza. Emva koko, isisombululo siyahluzwa ukufumana i-silica sol.
IiParameters zobuGcisa zeSilica Sol yoTyalo-mali lokuCasa | ||||||||
| Hayi. | Ukwakhiwa kwemichiza (iqhezu lobunzima, %) | Iipropati Zomzimba | Abanye | |||||
| SiO2 | Na2O | Ubuninzi (g/cm3) | pH | I-Kinematic Viscosity (mm2/s) | Ubungakanani beSiO2 Particl (nm) | Imbonakalo | Isigaba sokubhala | |
| 1 | 24 - 28 | ≤ 0.3 | 1.15 - 1.19 | 9.0 - 9.5 | ≤ 6 | 7 - 15 | kwi-invory okanye kumbala oluhlaza okhanyayo, ngaphandle kokungcola | ≥ 1 unyaka |
| 2 | 29 - 31 | ≤ 0.5 | 1.20 - 1.22 | 9.0 - 10 | ≤ 8 | 9 - 20 | ≥ 1 unyaka | |
Ukwenziwa kwenkqubo yokwenza iqokobhe le-silica sol kunoburhabaxa obusezantsi, ukuchaneka komgangatho ophezulu kunye nomjikelo wokwenza iqokobhe elide. Le nkqubo isetyenziswa ngokubanzi ekukhupheni i-alloys ekwazi ukumelana nobushushu obuphezulu, iintsimbi ezikwazi ukumelana nobushushu, iintsimbi ezingenasici, iintsimbi zekhabhoni, i-alloys ephantsi, i-alloys ye-aluminium kunye ne-alloys yobhedu.
I-silica sol echanekileyo elahlekileyo inkqubo yotyalo-mali yotyalo-mali ifanelekile kwimveliso ephindaphindwayo yezakhi zemilo yomnatha ukusuka kwiindidi ezahlukeneyo zesinyithi kunye ne-alloys yokusebenza ephezulu. Nangona ngokuqhelekileyo isetyenziselwa ukudubula okuncinci, le nkqubo isetyenziselwe ukuvelisa iifreyimu ezipheleleyo zeengcango zenqwelomoya, kunye neentsimbi zokujula ukuya kuma-500 kgs kunye nokuphoswa kwe-aluminiyam ukuya kuma-50 kgs. Xa kuthelekiswa nezinye iinkqubo zokuphosa ezifana ne-die casting okanye isanti casting, ingaba yinkqubo ebiza kakhulu. Nangona kunjalo, amacandelo anokuthi aveliswe kusetyenziswa utyalo-mali angabandakanya iikhontolo ezintsonkothileyo, kwaye kwiimeko ezininzi amacandelo afakwe kufutshane nemilo yenethi, ngoko ke afuna ukuphinda kusetyenzwe kancinane okanye angabikho emva kokuba esakhiwe.
Amacandelo aphambili otyalo-mali lwenkqubo yotyalo-mali zezi:
Umphezulu umaleko wesilika wokuncamathelisa. Inokuqinisekisa amandla omgangatho ophezulu kwaye iqinisekise ukuba umgangatho ophezulu awuqhekezi;
I-Refractory. Ngokuqhelekileyo i-high-purity zirconium powder ukuqinisekisa ukuba i-coating ine-refractoriness eyaneleyo kwaye ayisebenzi ngokwekhemikhali ngetsimbi etyhidiweyo.
Isithambiso. Yinto yangaphandle. Ngenxa yokuba i-silica sol coating iyimbumba esekwe emanzini, ukumanzisa phakathi kwayo kunye ne-wax mold ayilunganga, kwaye i-coating kunye ne-hanging effect ayilungile. Ngoko ke, kuyimfuneko yokongeza i-agent emanzi ukuphucula iingubo kunye nokusebenza kokuxhoma.
Defoamer. Ikwayi-surfactant enjongo yayo ikukuphelisa amaqamza omoya kwi-arhente yokumanzisa.
Umsulungekisi weenkozo. Inokuqinisekisa ukucokiseka okuziinkozo kwe-castings kunye nokuphucula iipropathi ze-mechanical of castings.
Ezinye izihlomelo:i-arhente yokumisa, isalathisi sokumisa, i-arhente yokukhululwa eqhubekayo, njl.
Ukukhethwa ngokuchanekileyo komlinganiselo wecandelo ngalinye kwi-silica sol coating ngundoqo ekuqinisekiseni umgangatho wokugquma. Amacandelo amabini asisiseko kwiingubo zi-refractories kunye nezibophelelo. Umlinganiselo phakathi kwezi zibini ngumlinganiselo we powder-to-liquid wengubo. Umlinganiselo we-powder-to-liquid wepeyinti unempembelelo enkulu ekusebenzeni kwepeyinti kunye negobolondo, eya kuthi ekugqibeleni ichaphazele umgangatho wokuphosa. Ukuba i-powder-to-liquid ratio ye-coating iphantsi kakhulu, i-coating ayiyi kuba ne-dense ngokwaneleyo kwaye iya kuba ne-voids eninzi, eya kwenza ukuba ubuso be-casting rough. Ngaphezu koko, umlinganiselo ophantsi kakhulu womgubo ukuya kulwelo uya kwandisa ukuthambekela kokutyatyekwa kwengubo, kwaye amandla eqokobhe aya kuba aphantsi, okuya kuthi ekugqibeleni kubangele ukuvuza kwesinyithi esinyibilikisiweyo ngexesha lokuphosa. Kwelinye icala, ukuba umlinganiselo we powder-to-liquid uphezulu kakhulu, i-coating iya kuba ngqindilili kakhulu kwaye i-fluidity iya kuba yimbi, okwenza kube nzima ukufumana isambatho esinobunzima obufanayo kunye nobukhulu obufanelekileyo.
Ukulungiswa kokugquma yinxalenye ebalulekileyo yokuqinisekisa umgangatho weqokobhe. Xa uqulunqa isambatho, amacandelo kufuneka ahlakazwe ngokufanayo kwaye axutywe ngokupheleleyo kwaye ahlanjululwe kunye nomnye. Izixhobo ezisetyenziselwa ukwakhiwa kwepeyinti, inani lezongezo kunye nexesha lokuvuselela zonke ziya kuchaphazela umgangatho wepeyinti. Ivenkile yethu yotyalo-mali isebenzisa imixube eqhubekayo. Ukuze kuqinisekiswe umgangatho wokugquma, xa onke amacandelo e-coat esanda kufakwa izinto ezitsha, iingubo kufuneka zixutywe ixesha elide elaneleyo.
Ukulawulwa kweempawu ze-silica sol coatings kuyinyathelo elibalulekileyo lokulawula umgangatho. I-viscosity, ubuninzi, ubushushu be-ambient, njl.
Ixesha lokuposa: Jul-25-2022