Low simende refractory castables inofananidzwa neyechinyakare aluminate simende refractory castables. Iyo simende yekuwedzera huwandu hwechinyakare aluminate simende refractory castables kazhinji 12-20%, uye huwandu hwekuwedzera hwemvura hunowanzo 9-13%. Pamusana pehuwandu hwemvura yakawedzerwa, muviri wakakanda une pores akawanda, hauna kuoma, uye une simba rakaderera; nekuda kwehukuru hwesimende yakawedzerwa, kunyange zvazvo yakakwirira yakajairika uye yakaderera tembiricha simba rinogona kuwanikwa, simba rinodzikira nekuda kwekushandurwa kwekristalline yecalcium aluminate pane yepakati tembiricha. Zviripachena, iyo CaO yakaunzwa inopindirana neSiO2 uye Al2O3 mune inokandwa kuti igadzire zvimwe zvakaderera-zvinonyungudika zvinhu, zvichikonzera kushatisa kwemhando yepamusoro-yekushisa zvinhu.
Kana ultrafine poda tekinoroji, yakakwirira-inoshanda admixtures uye yesainzi particle gradation inoshandiswa, simende yemukati inokandwa inoderedzwa kusvika isingasviki 8% uye mvura yemukati inoderedzwa kusvika ≤7%, uye yakaderera-simende yakatevedzana refractory castable inogona kugadzirwa. yakagadzirirwa uye kuunzwa muCaO yemukati ndeye ≤2.5%, uye zviratidzo zvayo zvekushanda zvinowanzopfuura izvo zvealuminate simende refractory castables. Iyi mhando ye refractory castable ine yakanaka thixotropy, kureva kuti, iyo yakasanganiswa ine imwe chimiro uye inotanga kuyerera nesimba shoma rekunze. Kana simba rekunze rabviswa, rinochengetedza chimiro chakawanikwa. Nokudaro, inonziwo thixotropic refractory castable. Self-flowing refractory castable inonziwo thixotropic refractory castable. Ndecheboka iri. Izvo chaizvo zvinoreva yakaderera simende yakatevedzana refractory castables haisati yatsanangurwa kusvika zvino. IAmerican Society for Testing and Materials (ASTM) inotsanangura uye inoisa refractory castables zvichienderana nezvavo zveCaO.
Dense uye yakakwirira simba ndiyo yakasarudzika maficha eiyo yakaderera-simende yakatevedzana refractory castables. Izvi zvakanaka pakuvandudza hupenyu hwebasa uye kushanda kwechigadzirwa, asi zvinounzawo matambudziko pakubika kusati kwashandiswa, ndiko kuti, kudurura kunogona kuitika nyore kana iwe usina kungwarira panguva yekubika. Chiitiko chekuputika kwemuviri chingada kudururwazve zvishoma, kana kuti zvinogona kuisa pangozi kuchengetedzeka kwevashandi vakakomberedza mumatambudziko akaomarara. Naizvozvo, nyika dzakasiyana dzakaitawo zvidzidzo zvakasiyana-siyana pakubika kwepasi-simende refractory castables. Iwo makuru ehunyanzvi matanho ndeaya: nekugadzira anonzwisisika ma curves ehovhoni uye nekuunza yakanakisa anti-kuputika maajenti, nezvimwewo, izvi zvinogona kuita kuti refractory castables Mvura inobviswa zvakanaka pasina kukonzera mamwe mhedzisiro.
Ultrafine poda tekinoroji ndiyo yakakosha tekinoroji kune yakaderera-simende yakatevedzana refractory castables (parizvino mazhinji eultrafine powders anoshandiswa muceramics uye refractory zvinhu ari pakati pe 0.1 ne10m, uye anonyanya kushanda seanoparadzira accelerator uye structural densifiers. simende zvimedu zvakaparadzirwa zvakanyanya pasina flocculation, nepo yekupedzisira ichiita ma micropores mumuviri wekudurura azadzwe zvizere uye inovandudza simba.
Parizvino inowanzoshandiswa marudzi e-ultrafine powders anosanganisira SiO2, α-Al2O3, Cr2O3, nezvimwewo. Nzvimbo chaiyo yeSiO2 micropowder inenge 20m2 / g, uye hukuru hwayo hunosvika 1/100 yehukuru hwesimenti, saka ine zvakanaka. kuzadza zvivakwa. Mukuwedzera, SiO2, Al2O3, Cr2O3 micropowder, nezvimwewo inogonawo kugadzira colloidal particles mumvura. Kana dispersant iripo, magetsi anopindirana akapetwa kaviri anoumbwa pamusoro pezvikamu kuti abudise electrostatic repulsion, iyo inokunda simba revan der Waals pakati pezvimedu uye inoderedza chiratidziro chesimba. Inodzivirira adsorption uye flocculation pakati pezvikamu; panguva imwecheteyo, iyo yakapararira inoshambadzirwa kumativi ezvikamu kuti iite chigadziko chekunyungudutsa, iyo inowedzerawo fluidity yekukanda. Iyi zvakare imwe yenzira dze ultrafine powder, kureva, kuwedzera ultrafine powder uye zvakakodzera dispersants zvinogona kuderedza kushandiswa kwemvura ye refractory castables uye kuvandudza fluidity.
Kugadzika uye kuomeswa kwepasi-simende refractory castables ndiyo mhedzisiro yekubatanidzwa kwekuita kwe hydration bonding uye kubatana kwekubatana. Iyo hydration uye kuomeswa kwecalcium aluminate simende inonyanya kuyerera kweiyo hydraulic phases CA uye CA2 uye crystal yekukura process ye hydrates yavo, ndiko kuti, ivo vanoita nemvura kuti vagadzire hexagonal flake kana tsono yakaita CAH10, C2AH8 uye Hydration zvigadzirwa zvakadaro. se cubic C3AH6 makristasi uye Al2O3аq gels anobva agadzira yakabatana condensation-crystallization network chimiro panguva yekurapa nekudziya maitiro. Iko agglomeration uye kubatana kunokonzerwa neiyo inoshanda SiO2 ultrafine powder inogadzira colloidal particles kana yasangana nemvura, uye inosangana neioni zvishoma nezvishoma kubva kune yakawedzerwa additive (kureva electrolyte substance). Nekuti machaji epamusoro ezviviri izvi akatarisana, kureva kuti, iyo colloid surface ine adsorbed counter ions, zvichikonzera iyo £ 2 Iyo inogona kudzikira uye condensation inoitika kana adsorption yasvika "isoelectric point". Mune mamwe mazwi, kana electrostatic repulsion pamusoro pezvimedu zvecolloidal ishoma pane kukwezva kwayo, kubatana kwakabatana kunoitika nerubatsiro rwe van der Waals force. Mushure mokunge refractory castable yakasanganiswa ne silica powder yakanyungudutswa, mapoka eSi-OH akaumbwa pamusoro peSiO2 akaomeswa uye anopera mvura kusvika kubhiriji, achigadzira siloxane (Si-O-Si) network structure, nokudaro kuomesa. Mune siloxane network chimiro, zvisungo pakati pesilicon neokisijeni hazvidzike sezvo tembiricha inowedzera, saka simba rinoramba richiwedzera. Panguva imwecheteyo, pakupisa kwepamusoro, SiO2 network structure ichaita neAl2O3 yakaputirwa mairi kuti iite mullite, iyo inogona kuvandudza simba pakupisa kwepakati nepamusoro.
Nguva yekutumira: Feb-28-2024
