Zvigadziko zvesimbi zvinoramba simende zvishoma zvinoenzaniswa nezvigadziko zvesimbi zvinoramba simende zvine aluminate. Huwandu hwesimbi dzinoramba simende dzinoramba simende dzine aluminate simende kazhinji hunenge 12-20%, uye huwandu hwemvura hunowanzova 9-13%. Nekuda kwehuwandu hwakawanda hwemvura inowedzerwa, muviri wesimbi une maburi akawanda, hauna kukora, uye hauna simba rakawanda; nekuda kwehuwandu hwakawanda hwesimbi inowedzerwa, kunyangwe simba rakawanda renguva dzose uye rakaderera rekupisa richigona kuwanikwa, simba rinoderera nekuda kwekushandurwa kwe calcium aluminate pakupisa kwepakati nepakati. Zviri pachena kuti CaO inosanganisirwa inosangana neSiO2 neAl2O3 musimbi inokanda kuti igadzire zvimwe zvinhu zvinonyunguduka zvishoma, zvichikonzera kuora kwehunhu hwesimbi yepamusoro.
Kana tekinoroji yeupfu hwakatsetseka, kusanganiswa kwesimba repamusoro uye gradation yesainzi zvimedu zvikashandiswa, huwandu hwesimende ye castable hunoderedzwa kusvika pasi pe8% uye huwandu hwemvura hunoderedzwa kusvika ≤7%, uye low-siment series refractory castable inogona kugadzirwa uye kuunzwa muCaO huwandu huri ≤2.5%, uye zviratidzo zvayo zvekushanda zvinowanzopfuura zvealuminate cement refractory castables. Rudzi urwu rwe refractory castables rune thixotropy yakanaka, kureva kuti, zvinhu zvakasanganiswa zvine chimiro chakati uye zvinotanga kuyerera nesimba rekunze. Kana simba rekunze rabviswa, rinochengetedza chimiro chakawanikwa. Naizvozvo, rinonziwo thixotropic refractory castable. Self-flowing refractory castables inonziwo thixotropic refractory castable. Iri muchikamu ichi. Zvinoreva chaizvo zve low cement series refractory castables hazvisati zvatsanangurwa kusvika pari zvino. American Society for Testing and Materials (ASTM) inotsanangura uye inoisa mumapoka refractory castables zvichienderana nehuwandu hwayo hweCaO.
Kukora uye simba rakawanda ndizvo zvinhu zvinonyanya kukosha pakugadzira ma "castables" asina simende yakawanda. Izvi zvakanaka pakuvandudza hupenyu hwebasa uye mashandiro echigadzirwa, asi zvinounzawo matambudziko pakubika usati washandisa, kureva kuti, kudurura kunogona kuitika nyore nyore kana ukasangwarira panguva yekubika. Chiitiko chekuputika kwemuviri chingada kudururazve, kana kuti chingaisa pangozi kuchengetedzeka kwevashandi vari pedyo kana zvanyanya. Nokudaro, nyika dzakasiyana-siyana dzakaitawo zvidzidzo zvakasiyana-siyana pakubika ma "castables asina simende yakawanda". Matanho makuru ehunyanzvi ndeaya: nekugadzira ma "curves" eovheni akakodzera uye kuisa mishonga yakanaka yekudzivirira kuputika, nezvimwewo, izvi zvinogona kuita kuti ma "castables asina simende" abviswe zvakanaka pasina kukonzera mimwe migumisiro yakaipa.
Tekinoroji yeupfu hwakatsetseka ndiyo tekinoroji huru yezvigadzirwa zvinogadziriswa zvesimende shoma (parizvino hupfu hwakawanda hwepamusoro hunoshandiswa muzvigadzirwa zveceramics nezvinhu zvinogadziriswa zviri pakati pe0.1 ne10m, uye zvinonyanya kushanda sezvinhu zvinosimudzira kupararira uye zvinoderedza kusimba kwechimiro. Yekutanga inoita kuti zvidimbu zvesimende zvipararire zvakanyanya pasina kupwanyika, nepo yekupedzisira ichiita kuti ma micropores ari mumuviri unodururwa azare zvizere uye anovandudza simba.
Mhando dzeupfu hwe ultrafine dzinoshandiswa pari zvino dzinosanganisira SiO2, α-Al2O3, Cr2O3, nezvimwewo. Nzvimbo chaiyo yeSiO2 micropowder inenge 20m2/g, uye saizi yezvikamu zvayo inenge 1/100 yehukuru hwezvikamu zvesimende, saka ine hunhu hwakanaka hwekuzadza. Pamusoro pezvo, SiO2, Al2O3, Cr2O3 micropowder, nezvimwewo zvinogonawo kugadzira zvikamu zve colloidal mumvura. Kana paine dispersant, jira remagetsi rinopindirana rinoumbwa pamusoro pezvikamu kuti rigadzire electrostatic repulsion, iyo inokunda simba revan der Waals pakati pezvikamu uye inoderedza simba re interface. Inodzivirira adsorption uye flocculation pakati pezvikamu; panguva imwe chete, dispersant inonamirwa kutenderedza zvikamu kuti igadzire solvent layer, iyo inowedzerawo fluidity ye castable. Iyi ndeimwe yenzira dze ultrafine powder, ndiko kuti, kuwedzera ultrafine powder uye dispersants dzakakodzera kunogona kuderedza kushandiswa kwemvura kwe refractory castables uye kunatsiridza fluidity.
Kugadzika nekuomarara kwezvigadziko zvesimbi zvinoramba simende yakaderera kunobva pakushanda pamwe chete kwekubatanidza mvura nekubatana. Kuomarara nekuomarara kwesimbi yecalcium aluminate kunonyanya kukonzerwa nekuomarara kwezvikamu zve hydraulic CA ne CA2 uye maitiro ekukura kwe crystal ema hydrates avo, kureva kuti, anosangana nemvura kuti agadzire hexagonal flake kana kuti neelement-shaped CAH10, C2AH8 uye Hydration products dzakadai se cubic C3AH6 crystals uye Al2O3аq gels zvinozogadzira condensed condensation-crystallization network structure panguva yekupisa nekupisa. Kuungana nekuomarara kunokonzerwa ne active SiO2 ultrafine powder inogadzira colloidal particles painosangana nemvura, uye inosangana nemaion zvishoma nezvishoma yakaparadzaniswa kubva kune yakawedzerwa additive (kureva electrolyte substance). Nekuti surface charges yezviri zviviri zvinopesana, kureva kuti, colloid surface ine adsorbed counter ions, zvichikonzera £2 The potential decrease uye condensation inoitika kana adsorption yasvika pa "isoelectric point". Nemamwe mashoko, kana kudzoserwa kwemagetsi pamusoro pezvikamu zvecolloidal kushoma pane kukwezva kwacho, kubatana kwakabatana kunoitika nerubatsiro rwesimba revan der Waals. Mushure mekunge chinhu chinokandwa chinosanganiswa neupfu hwesilica chabatanidzwa, mapoka eSi-OH anoumbwa pamusoro peSiO2 anoomeswa uye anobviswa mvura kuti aenderane, zvichigadzira chimiro che network che siloxane (Si-O-Si), nokudaro zvichioma. Muchimiro che network che siloxane, zvisungo pakati pesilicon neokisijeni hazvideredzi sezvo tembiricha ichiwedzera, saka simba rinoramba richikwirawo. Panguva imwe chete, patembiricha yakakwira, chimiro che network che SiO2 chichaita neAl2O3 yakaputirwa mairi kuti igadzire mullite, iyo inogona kuvandudza simba patembiricha yepakati neyakakwirira.
Nguva yekutumira: Kukadzi-28-2024
