{"id":3173,"date":"2012-12-13T05:26:26","date_gmt":"2012-12-13T03:26:26","guid":{"rendered":"http:\/\/www.ilkkimbuldu.com\/?p=3173"},"modified":"2017-01-06T20:24:13","modified_gmt":"2017-01-06T18:24:13","slug":"kobalti-kim-buldu","status":"publish","type":"post","link":"https:\/\/www.ilkkimbuldu.com\/?p=3173","title":{"rendered":"Kobalt\u0131 kim buldu"},"content":{"rendered":"

Manyetik \u00f6zellikte, metalik bir element. Co sembol\u00fc ile\u00a0g\u00f6sterilir. \u0130lk defa 1735\u2019te George Brant<\/strong> taraf\u0131ndan elde edildi. Almanca k\u00f6t\u00fc ruh veya cin-gulyabani\u00a0m\u00e2n\u00e2s\u0131na gelen \u201ckobold\u201d kelimesinden gelir. Eldeki bilgilere g\u00f6re kobalt tuzlar\u0131, milattaan 1000 y\u0131l\u00a0kadar \u00f6nce p\u0131rlanta \u00fcretiminde, porselen, cam, \u00e7\u00f6mlek ve \u00e7inide mavi renk has\u0131l etmede kullan\u0131l\u0131rd\u0131.<\/p>\n

Kobalt’\u0131n \u00d6zellikleri:<\/h2>\n

Kobalt sert, g\u00fcm\u00fc\u015f renginde, davran\u0131\u015f ve \u00f6zellik bak\u0131m\u0131ndan nikel ile demire \u00e7ok\u00a0benzeyen bir metaldir. Erime noktas\u0131 1495\u00b0C ve kaynama noktas\u0131 da 2967\u00b0C civ\u00e2r\u0131ndad\u0131r. \u00d6zg\u00fcl\u00a0a\u011f\u0131rl\u0131\u011f\u0131 8,99 g\/cm3t\u00fcr. Sertli\u011fi, saf demirinki kadard\u0131r. \u00c7ekme direnci 25 kg\/mm2dir.<\/p>\n

Yiyeceklerin sterilize edilmesinde, radyografide ve\u00a0radyokimy\u00e2da kullan\u0131l\u0131r.\u00a0K\u00fck\u00fcrt, karbon ve fosfor, kobalt\u0131n \u015fekillendirilebilme \u00f6zelli\u011fini k\u00f6t\u00fcle\u015ftirir. Kobalt, demire kat\u0131ld\u0131\u011f\u0131\u00a0zaman y\u00fcksek s\u0131cakl\u0131klarda yumu\u015famas\u0131n\u0131 \u00f6nler, bu sebepten hava \u00e7eliklerinin en m\u00fchim ala\u015f\u0131m\u00a0eleman\u0131d\u0131r. Nikel gibi ferromagnetiktir. Fakat bu \u00f6zellik, allotropik hal de\u011fi\u015fmesi sebebiyle 850\u00b0C\u2019de\u00a0kaybolur. Oksitlenme kabiliyeti demirden azd\u0131r. Kuru ve normal atmosfer \u015fartlar\u0131nda korozyona\u00a0u\u011framaz.<\/p>\n

Kobalt Nerlerde Bulunur<\/h2>\n

Kobalt, tabiatta minerali az bulunan bir elementtir. En bilinen mineralleri, smaltin ((Co,
\nNi)As2) ve kobaltit (CoAsS)tir. Bundan ba\u015fka nikel ve bak\u0131r cevherlerinde az oranda bulunmaktad\u0131r.
\nFakat saf halde elde edilmesi, di\u011fer elementlerden ayr\u0131lmas\u0131n\u0131n zorlu\u011fundan dolay\u0131 hayli g\u00fc\u00e7 olup, bir
\ns\u00fcr\u00fc i\u015flem gerektirir.<\/p>\n

Kolabt Nerede Nas\u0131l Kullan\u0131l\u0131r<\/h2>\n

Kobalt, bilhassa elektrolizle, di\u011fer metallerin kaplanmas\u0131nda kullan\u0131l\u0131r. Kobalt kaplama,
\n\u00e7ok parlak ve sert oldu\u011fu i\u00e7in nikelajdan daha iyidir. Fakat nikelaj daha ucuz oldu\u011fu i\u00e7in tercih
\nedilmektedir.\u00a0Hava \u00e7elikleri i\u00e7inde % 5 ile 12 aras\u0131nda kobalt bulunur. Kobalt, \u00e7eliklere % 40\u2019a kadar il\u00e2ve edildi\u011fi\u00a0zaman m\u0131knat\u0131slanma \u00f6zelli\u011fini iyile\u015ftirir. Bu sebepten m\u0131knat\u0131slar\u0131n vazge\u00e7ilmez bir ala\u015f\u0131m
\neleman\u0131d\u0131r.<\/p>\n

Genel olarak kobalt, cam ve metal birle\u015ftirmelerinde y\u00fcksek s\u0131cakl\u0131\u011fa, oksitlenme ve
\nkorozyon dayan\u0131m\u0131 gereken yerlerde, gaz t\u00fcrbinleri motorlar\u0131nda, t\u00fcrbin paletlerinde, vida, civata,
\negzost \u00e7\u0131k\u0131\u015f kanallar\u0131 ve benzeri yerlerde kullan\u0131l\u0131r. \u0130\u00e7erisinde % 20-65 aras\u0131nda kobalt bulunan
\nala\u015f\u0131mlar \u015fiddetli korozif etkilere, a\u015f\u0131nmaya oksitlenmeye diren\u00e7 g\u00f6sterirler. Bu bak\u0131mdan di\u015f\u00e7ilik ve
\ncerrah\u00ee tak\u0131mlar\u0131, b\u0131\u00e7ak, pens, ne\u015fterler ile ayd\u0131nlatma reflekt\u00f6rlerinde kobaltl\u0131 \u00e7elikler kullan\u0131l\u0131r. Bu
\n\u00e7elikler genel olarak kobalt yan\u0131nda krom, volfram veya nikel, volfram ve molibden ihtiva ederler.
\nKobalt m\u00e2visi: Tenard m\u00e2visi olarak da bilinen kobalt m\u00e2visi en \u00f6nemli m\u00e2vi boyar maddelerdendir.
\nEsas\u0131 kobalt al\u00fcminat olup, zehirsizdir. Asit ve alkalilere kar\u015f\u0131 da dayan\u0131kl\u0131d\u0131r. \u00c7inko oksit ve kobalt
\nm\u00e2visi vard\u0131r. Kobalt m\u00e2visi su veya ya\u011fa il\u00e2ve edilerek kozmetikte kullan\u0131l\u0131r.<\/p>\n

Kobalt\u0131n biyolojik \u00f6nemi<\/h2>\n

Kobalt, B12 vitaminiyle beraber kobalamin bile\u015fi\u011fini meydana getiren bir
\nelementtir. Pankreasta \u00f6nemli miktarda bulunur. \u0130ns\u00fclinin ve baz\u0131 enzimlerin sentezlerinde kullan\u0131l\u0131r.
\nYeterince B12 vitamini ihtiva eden besinler al\u0131nd\u0131\u011f\u0131nda kobalt eksikli\u011fi g\u00f6r\u00fclmez.<\/p>\n","protected":false},"excerpt":{"rendered":"

Manyetik \u00f6zellikte, metalik bir element. Co sembol\u00fc ile\u00a0g\u00f6sterilir. \u0130lk defa 1735\u2019te George Brant taraf\u0131ndan elde edildi. Almanca k\u00f6t\u00fc ruh veya cin-gulyabani\u00a0m\u00e2n\u00e2s\u0131na gelen \u201ckobold\u201d kelimesinden gelir. Eldeki bilgilere g\u00f6re kobalt tuzlar\u0131,…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[92],"tags":[2726,2171],"class_list":["post-3173","post","type-post","status-publish","format-standard","hentry","category-bilim","tag-george-brant","tag-kobalt"],"_links":{"self":[{"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/posts\/3173"}],"collection":[{"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3173"}],"version-history":[{"count":5,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/posts\/3173\/revisions"}],"predecessor-version":[{"id":8127,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=\/wp\/v2\/posts\/3173\/revisions\/8127"}],"wp:attachment":[{"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ilkkimbuldu.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}