Ibikoresho byo hasi bya sima bigereranywa na aluminate ya sima yamashanyarazi. Umubare wongeyeho sima ya gakondo ya aluminate ya sima yamashanyarazi isanzwe ni 12-20%, naho umubare wamazi ni 9-13%. Bitewe n'amazi menshi yongeweho, umubiri watewe ufite imyenge myinshi, ntabwo ari mwinshi, kandi ufite imbaraga nke; kubera ubwinshi bwa sima yongewemo, nubwo imbaraga zisanzwe nubushyuhe bwo hasi zishobora kuboneka, imbaraga ziragabanuka bitewe na kristaline ihinduka ya calcium aluminate mubushyuhe bwo hagati. Ikigaragara ni uko CaO yatangijwe ikorana na SiO2 na Al2O3 mukibanza kugirango habeho ibintu bimwe na bimwe bishonga, bikaviramo kwangirika kwubushyuhe bwo hejuru.
Iyo tekinoroji ya ultrafine, ikoreshwa neza cyane hamwe nu bumenyi bwa siyanse ya siyanse ikoreshwa, ibice bya sima biri muri castable bigabanuka kugeza munsi ya 8% naho amazi agabanuka kugeza kuri ≤7%, hamwe na ciment ya sima yo hasi ishobora gutegurwa hanyuma ikazanwa mubirimo bya CaO ni ≤2.5%, kandi ibipimo byimikorere muri rusange birenze ibyakozwe na aluminate cement. Ubu bwoko bwa retractory castable bufite thixotropy nziza, ni ukuvuga, ibintu bivanze bifite imiterere runaka kandi bigatangira gutemba nimbaraga nke zo hanze. Iyo imbaraga zo hanze zavanyweho, zigumana imiterere yabonetse. Kubwibyo, byitwa kandi thixotropic refractory castable. Kwiyoroshya-kwangirika kwizina ryitwa thixotropic retractory castable. Biri muriki cyiciro. Ubusobanuro nyabwo bwa sima yo hasi yamashanyarazi yamashanyarazi ntabwo bwasobanuwe kugeza ubu. Sosiyete y'Abanyamerika ishinzwe ibizamini n'ibikoresho (ASTM) isobanura kandi igashyira mu byiciro ibikoresho bivunika bitewe n'ibirimo CaO.
Ubucucike nimbaraga nyinshi nibintu byingenzi biranga sisitemu yo hasi ya sima yamashanyarazi. Ibi nibyiza mugutezimbere ubuzima bwa serivisi nigikorwa cyibicuruzwa, ariko kandi bizana ibibazo muguteka mbere yo kubikoresha, ni ukuvuga, gusuka bishobora kubaho byoroshye mugihe utitonze mugihe cyo guteka. Ikintu cyo guturika kumubiri gishobora gusaba kongera gusuka byibuze, cyangwa gishobora guhungabanya umutekano bwite w abakozi bakikije mugihe gikomeye. Kubwibyo, ibihugu bitandukanye byanakoze ubushakashatsi butandukanye kubijyanye no guteka urukurikirane rwa sima nkeya. Ingamba zingenzi za tekiniki ni: mugukora imirongo ifatika yumuriro no kumenyekanisha ibintu byiza birwanya kurwanya ibisasu, nibindi, ibi birashobora gutuma imyanda itavunika Amazi akurwaho neza nta gutera izindi ngaruka.
Tekinoroji ya Ultrafine ni tekinoroji yingenzi ya sisitemu yo hasi ya sima yamashanyarazi (kuri ubu ifu ya ultrafine ikoreshwa mububumbyi bwibikoresho bya ceramique nibikoresho byavunitse mubyukuri iri hagati ya 0.1 na 10m, kandi ikora cyane nka moteri yihuta ikwirakwiza kandi ikanubaka ibyubaka.
Kugeza ubu ubwoko bukunze gukoreshwa bwifu ya ultrafine harimo SiO2, α-Al2O3, Cr2O3, nibindi. Ubuso bwihariye bwa micropowder ya SiO2 bugera kuri 20m2 / g, kandi ubunini bwabwo bugera kuri 1/100 cyubunini bwa sima, bityo bukaba bufite ibintu byiza byuzuye. Mubyongeyeho, SiO2, Al2O3, Cr2O3 micropowder, nibindi birashobora no gukora uduce duto twa colloidal mumazi. Iyo ikwirakwizwa rihari, amashanyarazi arengana aremye hejuru yubutaka kugirango habeho kwanga electrostatike, bigatsinda imbaraga za van der Waals hagati yingingo kandi bikagabanya ingufu zimbere. Irinda adsorption na flocculation hagati yuduce; icyarimwe, ikwirakwizwa ryamamajwe hirya no hino kugirango habeho igishishwa, nacyo cyongera amazi ya castable. Ubu kandi ni bumwe mu buryo bw'ifu ya ultrafine, ni ukuvuga, kongeramo ifu ya ultrafine hamwe no kuyikwirakwiza birashobora kugabanya ikoreshwa ry'amazi y’ibikoresho byangiza kandi bigateza imbere amazi.
Gushiraho no gukomera kwa ciment-cement yamashanyarazi nigisubizo cyibikorwa byahujwe no guhuza hydration hamwe no guhuza ubumwe. Kuvomera no gukomera kwa calcium aluminate cement ahanini ni hydratiya yicyiciro cya hydraulic icyiciro cya CA na CA2 hamwe nuburyo bwo gukura kwa kirisiti ya hydrata zabo, ni ukuvuga ko zifata amazi kugirango zibe flake ya hexagonal cyangwa inshinge zimeze nka CAH10, C2AH8 hamwe na Hydration nkibikoresho bya Cube ya C3AH6 hamwe na al2O3аq. inzira. Agglomeration hamwe no guhuza biterwa nifu ya SiO2 ultrafine ikora ifu ikora uduce duto twa colloidal iyo ihuye namazi, ikanahura na ion zitandukanijwe buhoro buhoro ninyongeramusaruro (ni ukuvuga electrolyte). Kuberako ibiciro byubuso byombi bihabanye, ni ukuvuga, ubuso bwa colloid bwanditseho konte ion, bigatuma £ 2 Ubushobozi bushobora kugabanuka no kwegerana bibaho mugihe adsorption igeze kuri "pointe isoelectric point". Muyandi magambo, iyo kwanga electrostatike hejuru yubutaka bwa colloidal bitarenze ibyo bikurura, guhuza hamwe bibaho hifashishijwe imbaraga za van der Waals. Nyuma yo kuvunika ibintu bivanze nifu ya silika byegeranijwe, amatsinda ya Si-OH yashizwe hejuru ya SiO2 arumishwa kandi akanabura umwuma kugirango ikiraro, bigizwe numuyoboro wa siloxane (Si-O-Si), bityo ugakomera. Mu miterere y'urusobe rwa siloxane, isano iri hagati ya silicon na ogisijeni ntigabanuka uko ubushyuhe bwiyongera, bityo imbaraga nazo zikomeza kwiyongera. Muri icyo gihe, ku bushyuhe bwinshi, imiterere y'urusobe rwa SiO2 izitwara hamwe na Al2O3 iyiziritseho kugirango ikore mullite, ishobora kuzamura imbaraga ku bushyuhe bwo hagati n'ubushyuhe bwo hejuru.
Igihe cyo kohereza: Gashyantare-28-2024
