Steel Fiber for Refractory Castables: Melt Extraction, Grades and Thermal Shock

Labari

Yuni 15, 2016

Fiber refractory da fiber tsarin su ne samfura daban-daban, daga kayan tushe zuwa siffa. Yin amfani da igiyar ƙugiya mai ƙugiya a cikin siminti shine kuskuren gama-gari kuma mafi tsada a cikin wannan rukunin.

Fiber Refractory da Fiber Tsarin Tsarin Samfura ne daban-daban

Zubar da ƙugiya mai ƙugiya a cikin simintin gyaran kafa shine kuskuren gama-gari kuma mafi tsada a wannan rukunin. Fiber na tsarin yana sama a kusa da 300 zuwa 400 C; sama da wannan ƙarfi ya faɗi kuma sutura ya kasa. Simintin gyaran fuska yana gudana a 800 zuwa 1400 C kuma rufin kuma yana ɗaukar saurin dumama da sanyaya. Fiber refractory ya bambanta a cikin abu, a cikin tsari da kuma siffar: tushe shine bakin karfe, tsari shine narke hakar, kuma siffar tari ce mai girma uku maras kyau. Manufar ba ƙarfi ba ne amma tsayayya da iskar shaka da ƙura a zafin jiki yayin da ake haɗawa da simintin gyare-gyare.

Narke hakar: Me yasa Siffofin 3D marasa daidaituwa suka fi kyau

Narke hakar yana fitar da narkakkar bakin karfe fita tare da iska mai tsananin gudu ko kuma dabaran juyi kuma yana sanyaya shi cikin fiber a cikin jirgin. Babu wani zane da aka haɗa, don haka siffar ba ta dace ba: mai lankwasa, wani lokacin reshe, bambanta da kauri. Wannan rashin bin ka'ida shine abin da ke haifar da ingantacciyar ma'amala mai girma uku a cikin ma'auni maimakon tsattsauran gogayya ta madaidaiciyar waya. A cikin gwaje-gwaje na kwatankwacin, fiber da aka cirewa narke yana ɗaga modul na tsagewa a fili fiye da madaidaiciyar fiber daidai daidai gwargwado, kuma dalili shine anchorage geometry. Watsawa ita ce fa'ida ta biyu: Fiber ɗin da ke narkewa yana rabuwa a bushe ko rigar cakuɗe da ɗaure ga simintin gyare-gyare ba tare da barin ɓoyayyiya ba, kuma babu komai a cikin rufin shine inda zazzagewa ke farawa.

304, 310S da 446: Zazzabi Yana Yanke Mataki

Maki uku sun rufe nau'ikan zafin jiki uku kuma wannan shine yanke shawara ta farko. 304 shine ma'auni don ci gaba da sabis zuwa 650 C; 310S, kuma ana siyar dashi azaman 2520, yana rufe matsakaici da babban zafin jiki zuwa 1200 C; 446 shine babban matakin oxidation resistant zuwa 1400 C. Zaɓi ƙananan ƙananan kuma fiber oxidises, rasa sashi kuma rufin ya kasa da wuri; zabi mai girma da yawa kuma farashin ya ɓace. Tambayar ba ita ce iyakar tanderu ba amma yanayin zafin jiki na dogon lokaci na layin fiber yana zaune a ciki. Rubutun yana da gradient, tare da 1400 C a fuskar zafi kuma watakila 800 C a baya, don haka yadudduka biyu na iya amfani da maki daban-daban.

Shock thermal: Quenches Water Ashirin daga 1000 C

Kashi 80 cikin 100 na gazawar da ba a konewa ba a ƙone su amma ana girgiza su ta hanyar dumama da sanyaya da sauri. Ƙimar fiber fiber na ƙarfe a cikin girgizar zafi yana kama haɓakar fashewa: bayan matrix ɗin ya fashe, fiber yana gadar faɗuwar, yana riƙe ƙaramin girmansa kuma yana hana spalling. Ma'auni shine hawan keke, wanda aka kashe daga 1000 C zuwa ruwa, sau ashirin ba tare da tsagewa ko spalling ba. Wannan gwajin ya faɗi ƙarin game da rayuwar sabis fiye da yanayin fashewa, saboda kashewa yana yin sanyi da sauri fiye da zafi.

Sashi yana biye da Tsarin Rubutun, Ba Jigon kg/m3 ba

Simintin tsarin yana da kewayon aiki na 30 zuwa 80 kg/m3; refractory castables ba. Matsakaicin ya dogara da jimillar kima, buƙatar ruwa, hanyar sanyawa (simintin simintin gyare-gyare, ramming, gunning) da kauri, kuma yawanci yana faɗi tsakanin 0.5% da 2% ta ƙarar. Da yawa da kuma aiki ya rushe, ma'aikatan suna ƙara ruwa, kuma ƙara ruwa yana lalata refractoriness. Wannan shine mafi yawan gazawar filin a cikin wannan samfur. Madaidaicin tsari shine don mai ba da izini don ba da ƙirar haɗin gwiwa da mai yin fiber don samarwa da shi, duka biyu suna aiki daga yarjejeniyar fasaha ɗaya.

Abubuwan fashewa: Me yasa Fiber ke Rage Shi

A lokacin zafi na farko, ruwan da ke cikin simintin zai juya zuwa tururi, kuma idan ba zai iya tserewa ba, matsa lamba yana raba layin. Ƙarfe na ƙarfe yana taimakawa ta hanyar samar da hanyoyin da aka haɗa don tururi da kuma ta hanyar haɗa tsaga don buɗewa a hankali, juya fashewa zuwa fashewa. Don kauri mai kauri da rigar ƙananan siminti siminti wannan yana da mahimmanci fiye da samun ƙarfin. Wasu haɗe-haɗe kuma suna ƙara fiber na halitta tare da wurin narkewa kusa da 165 C, wanda ke ƙonewa da wuri kuma yana barin tashoshi mai huɗa, yana haɓaka fiber ɗin ƙarfe. Wannan shine dalilin da ya sa nau'ikan fiber guda biyu sukan bayyana a cikin girke-girke ɗaya.

Ƙunƙarar taga 0.5 zuwa 2 bisa ɗari a cikin Castables

Ƙarfe fiber yana shiga cikin simintin jujjuyawa don tsayayya da zafin zafin zafin jiki, ba don haɓaka ƙarfin sanyi ba, wanda shine dalilin da yasa taga sashi ya kasance kunkuntar: 0.5 zuwa 2 bisa dari ta ƙara, tare da yawancin aikace-aikacen kusa da kashi 1. Kasa da kashi 0.5 akwai ƴan zaruruwa kaɗan a kan jirgin da zai fashe don gada shi. Sama da kashi 2 cikin 100 na zaruruwa suna tsoma baki yayin haɗuwa, iyawar aiki ya rushe, kuma girgiza yana haifar da shimfidar yanayin da ke barin jirage masu rauni tsakanin yadudduka. Tsawon fiber yana da alaƙa da matsakaicin matsakaicin girman, yawanci aƙalla sau uku wannan girman, in ba haka ba tarin yana toshe fiber kuma babu ci gaba da siffofin hanyar sadarwa; amma bayan 40 mm fiber yana daidaitawa yayin rawar jiki. Oda gaurayawa yana haifar da gazawa fiye da sashi. A busar da foda da zaren na tsawon mintuna biyu zuwa uku, sai fiber ya watse a cikin garin, sannan a zuba ruwa; Kada a ƙara ruwa da farko kuma a yayyafa fiber bayan haka, wanda koyaushe yana yin ƙwallo. Hanyar bushewa ta yanke shawarar sakamakon: riƙe a digiri 150 Celsius don fitar da ruwa kyauta, riƙe a 350 don fitar da ruwan da aka daure da sinadarai, sannan sai kawai ya hau sama da 600 zuwa zafin sabis, tare da lokaci a kowane mataki ya kai kauri. Zafi da sauri da matsatsin tururi na ciki ba shi da inda za a je, sararin sama yana ɓata, kuma wannan shine yanayin gazawar fiber ba zai iya ceto ba. Matsayi yana biye da tanderun: 304 ƙasa da digiri Celsius 650, 310S sama da 1000, da 446 kawai don wuraren kiln a kusa da 1400.

Tambayoyi guda uku da za a yi wa mai kaya

Tambayoyi guda uku suna tace mafi yawan masu samar da fiber. Na farko, shine matakin tushe 304, 310S ko 446, kuma akwai takaddun kayan aiki. Na biyu, menene ainihin diamita da tsayin tsayi, yawanci 0.3 zuwa 0.5 mm diamita da tsayin 15 zuwa 20 mm, kuma ana iya yanke su zuwa kauri mai rufi. Na uku, akwai bayanan zagayowar girgizar zafi. Don ƙimar daraja da zafin jiki, ɓangaren refractory na shafin samfurin fiber na ƙarfe ya lissafa 304, 310S, 446 da 430 tare da bayanan zafin jiki da zafin jiki, waɗanda za a iya haɗe kai tsaye ga binciken azaman haɗin fasaha.