"Tough Guys" a cikin Rare Metals

A cikin dangin ƙarfe da ba kasafai ba, akwai mambobi da yawa masu “jama’a masu taurin kai”.Ba wai kawai suna da manyan abubuwan narkewa ba, har ma suna da ƙarfin juriya na lalata kuma ba a sauƙaƙe oxidized a cikin iska ba, don haka ana kiran su "masu tauri" a cikin karafa.

Da narkewar batu natungstenyana da girma har zuwa 3410 ° C, wanda shine mafi girman duk karafa, don haka ana iya amfani dashi azaman kayan filament.Yin jure yanayin zafi na 2000 ° C wani biredi ne na tungsten.Karfe tungsten ana amfani da shi ne a cikin siminti da siminti, ƙarfe na musamman da sauran kayayyaki, kuma ana amfani da shi sosai a masana'antar tsaro, sararin samaniya, masana'antar bayanai, wasu kuma suna ba shi taken "haƙorin masana'antar".

Na biyu narkewa batu ne karfe rhenium, wanda shi ne 3180 ℃.Ya kamata a ambata cewa rhenium wani abu ne da ba kasafai ba.Abubuwan da ke cikin sa a cikin ɓawon ƙasa ba su da yawa kuma suna tarwatsewa, kawai sama da na protactinium da radium.Saboda haka, shine kashi na ƙarshe da aka samu a yanayi.Tun da Mendeleev ya gano ka'idar abubuwa na lokaci-lokaci, masana kimiyya sun kasa gano ta sama da rabin karni har sai da masanan Jamusanci suka gano ta a shekara ta 1925.

Abu na uku na narkewa shine karfe osmium, wanda shine 3045 ℃.A lokaci guda kuma, shi ne ƙarfe mafi nauyi a yanayi, tare da yawa har zuwa 22.4 g/cm3.A wuri na hudu shi ne karfe tantalum, wanda ke da wurin narkewa na 2996 ° C.

Karfe tare da ma'aunin narkewa sama da 2000 ° C, kazalika da molybdenum, hafnium, da sauransu.Molybdenummuhimmin abu ne mai mahimmanci ga mutane, dabbobi da tsirrai.Jimlar adadin molybdenum da ke cikin jikin manya shine 9 MG, tare da mafi girman abun ciki a hanta da koda.Tsire-tsire na iya gyara nitrogen a ƙarƙashin aikin molybdenum kuma su canza nitrogen zuwa wani nau'i wanda za'a iya sha.Ana amfani da Molybdenum musamman don tace ƙarfe iri-iri, bakin karfe, ƙarfe mai jure zafi da manyan gami.Ana amfani da ita sosai a masana'antar soji kuma ana kiranta da "karfe na yaki".Ƙarfe mai narkewazafizafin jiki na 2233 ° C.Yana da kyau a faɗi cewa gami da hafnium, Ta4fC5, shine sinadari tare da mafi girman sanannen narkewa, kusan 4215°C.

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