Abubuwan narkewar kwano tagulla

Mafi cutarwa kazanta a cikinkwano tagullasu ne aluminum, silicon da magnesium.Lokacin da abun cikin su ya wuce 0.005%, sakamakon SiO2, MgO da Al2O3 oxide inclusions zai gurɓata narkewa kuma ya rage aikin wasu sassa na gami.

Lokacin da ake narkewa da tagulla, tunda wurin tafasa na zinc yana da ɗan ƙaramin ƙarfi kuma yana da kusanci da iskar oxygen, narke ya kamata a deoxidized sannan a saka shi cikin tanderun don narkewa.Farantin tagulla na Chuangrui na iya ƙara haɓakar deoxidation, wanda ya fi taimako don guje wa haɗarin samar da SnO2.Zinc da phosphorus a cikin narkewa suna da cikakkiyar tsarin deoxidation, kuma sakamakon 2ZnO · P2O5 ya fi sauƙi don rabuwa da narke, kuma yana da amfani don inganta yanayin narkewa.

Yin amfani da busasshen cajin, ko ma daɗaɗa cajin farko kafin narkewa, na iya ragewa ko ma gujewa ɗaukar iskar gas ta narke.Daidaitaccen rabo na sabon ƙarfe da sharar tsari kuma suna ba da gudummawa ga ingantaccen narke.Adadin sharar gida bai kamata ya wuce 20% zuwa 30%.Narkar da ta ɗan gurɓata da ƙazanta na iya zama oxidized ta busa iska ko ta ƙara oxidant (misali jan ƙarfe oxide CuO).Za a iya tace tarkacen da wasu abubuwa na ƙazanta suka gurɓata sosai ta hanyar ƙarfi ko iskar gas, gami da narkewa, don haɓaka ingancinsa.

Ciyarwar da ta dace da jeri na narkewa, gami da narkewa tare da tanderun shigar da wutar lantarki mai mitar ƙarfe-core tare da tashin hankali mai ƙarfi, suna da fa'ida don ragewa da guje wa rarrabuwa.Ƙara adadin nickel mai dacewa zuwa narke yana da amfani don haɓaka ƙarfin ƙarfi da sauri na crystallization na narkewa, kuma yana da wani tasiri akan ragewa da guje wa rarrabuwa.Hakanan za'a iya zaɓar nau'ikan ƙari iri ɗaya, zirconium da lithium.Hanyar narke gauraye daban daban na narkewar gubar tagulla daban sannan kuma a yi allurar narke a cikin narkar tagulla a 1150-1180°C.A cikin yanayi na yau da kullun, tagulla mai narkewa mai ɗauke da phosphorus galibi ana rufe shi da kayan carbonaceous kamar gawayi ko coke mai ba tare da sauran ƙarfi ba.Wakilin suturar da ake amfani da shi lokacin narke kwano tagulla mai ɗauke da zinc shima yakamata ya haɗa da kayan da ke ɗauke da carbon kamar gawayi.Yayin ci gaba da yin simintin gyare-gyare, yana da kyau a sarrafa zafin zafin jiki a 100-150 ° C sama da alloy liquidus.