Thealuminum tagullajerin sun fi rikitarwa, kuma wasu daga cikin hadadden tagulla na aluminium sun ƙunshi abubuwa na alloying na uku da na huɗu kamar su manganese, nickel, silicon, cobalt da arsenic.Hal66-6-3-2 da HAL61-4-3-1, waxanda suke da abubuwa da yawa da ake hadawa da su, sun hada da sinadarai guda shida, kuma wasu daga cikinsu akwai tagulla mai sarkakkiya da aka sarrafa ta aluminum daga simintin simintin gyare-gyare na musamman.Alloys daban-daban suna da kaddarorin narkewa daban-daban don haka suna buƙatar hanyoyin narkewa daban-daban.
Da farko dai, aluminum tagulla yana da sauƙi don "kumfa" yayin aikin narkewa kuma ana iya gurɓata shi ta hanyar aluminum ko wasu abubuwan haɗin ƙarfe.Tsarin narkewa mai ma'ana yakamata ya ƙunshi wasu matakan kariya.Idan akwai fim din oxide na aluminum a saman narke, zai iya kare narke zuwa wani matsayi, kuma ba lallai ba ne don ƙara wani abin rufewa yayin narkewa.
Binciken ka'idar: Lokacin ƙara zinc zuwa tafkin narkakkar da aka kiyaye ta fim ɗin Al2O3, za a iya rage rashin ƙarfi na zinc.A gaskiya ma, tun da tafasar zinc na iya lalata fim din oxide, kawai lokacin da aka yi amfani da ruwa mai dacewa, wato, narke zai iya zama mafi aminci, za a iya kauce wa konewar asarar zinc da kyau.Cryolite ya zama wani abu mai mahimmanci kuma mai mahimmanci a cikin juzu'in da ake amfani da shi don narkar da tagulla na aluminum.Narkewar aluminum-tagulla ba dole ba ne ta kasance mai zafi sosai don hana narkewa daga oxidizing da shakar da yawa.Idan abun ciki na iskar gas a cikin narke yana da girma, za ku iya zaɓar ɗaukar hoto don tsaftacewa, ko amfani da gyaran iskar gas mara amfani, ciki har da sake juyewa da sake maimaitawa kafin zubawa, da yin amfani da kwalban kararrawa don danna gishiri na chloride a cikin narke don narkewa ta hanyar.Babban abubuwan da ke narkewa kamar baƙin ƙarfe, manganese, silicon, da sauransu waɗanda ke cikin hadadden tagulla na aluminum yakamata a ƙara su a cikin nau'in Cu-Fe, Cu-Mn da sauran allunan tsaka-tsaki.
Gabaɗaya, babban cajin da aka yi amfani da shi da jan ƙarfe yakamata a ƙara a cikin tanderu da farko sannan a narke, ana iya ƙara cajin da aka raba kai tsaye zuwa narke, kuma ana ƙara zinc a ƙarshe a ƙarshen narkewa.Idan aka yi amfani da tsaftataccen ƙarfe a matsayin cajin, sai a cire su da sinadarin phosphorus bayan narkewar su, sannan a saka manganese (Cu-Mn), iron (Cu-Fe), sannan aluminium, sannan a ƙarshe zinc.A cikin hadadden aluminum brass HAL66-6-3-2, yakamata a sarrafa abun cikin baƙin ƙarfe a 2% ~ 3%, kuma abun cikin manganese yakamata a sarrafa shi kusan 3%.In ba haka ba, lokacin da abun ciki ya yi yawa, wasu kaddarorin na iya zama mummunan tasiri.Saboda ƙarancin ƙarancin aluminum, idan narkewar ba a zuga shi sosai ba, yana iya haifar da haɗakar sinadarai marasa daidaituwa.Lokacin da aka sami narkewar wucin gadi a cikin tanderu, gabaɗaya aluminum da ɓangaren jan karfe ana iya ƙarawa da farko, sannan ana iya ƙara zinc bayan narkar da su.Lokacin da aka ƙara aluminum, za a iya fitar da babban adadin zafi saboda haɗuwa da jan karfe da aluminum.Za a iya amfani da tsari na exothermic don hanzarta tsarin narkewa, amma idan ba a yi aikin ba yadda ya kamata, matsanancin zafin jiki na iya haifar da zafin jiki na gida na narkakken tafkin ya yi yawa, wanda ya haifar da tashin hankali na zinc, kuma a lokuta masu tsanani, ana iya fitar da harshen wuta daga tanderun.Zazzabi na narkewar HAL67-2.5 yawanci 1000 ~ 1100 ℃ ne, kuma zafin narke HAL60-1-1, HAL59-3-2, HAL66-6-6-2 yawanci 1080 ~ 1120 ℃, kuma ƙasan zafin jiki yakamata a yi amfani dashi gwargwadon iko.Yanayin narkewa.
Lokacin aikawa: Jul-07-2022