{"id":5068,"date":"2020-09-25T06:52:48","date_gmt":"2020-09-25T06:52:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5068"},"modified":"2020-09-25T06:52:48","modified_gmt":"2020-09-25T06:52:48","slug":"aluminum-pinholes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/tr\/aluminum-pinholes\/","title":{"rendered":"Al\u00fcminyum \u0130\u011fne Delikleri"},"content":{"rendered":"<p><strong>Al\u00fcminyumda i\u011fne deli\u011fi olu\u015fmas\u0131n\u0131n ba\u015fl\u0131ca nedeni:<\/strong><\/p>\n<p>Eritme s\u0131cakl\u0131\u011f\u0131 ne kadar y\u00fcksek olursa, erimi\u015f metal nemli havadan o kadar fazla hidrojen emer. Hidrojenin ana kayna\u011f\u0131, erimi\u015f al\u00fcminyumun y\u00fcksek s\u0131cakl\u0131\u011f\u0131nda su buhar\u0131n\u0131n ayr\u0131\u015fmas\u0131d\u0131r. Hidrojenin erimi\u015f al\u00fcminyumdaki \u00e7\u00f6z\u00fcn\u00fcrl\u00fc\u011f\u00fc s\u0131cakl\u0131k artt\u0131k\u00e7a artar, ancak kat\u0131 al\u00fcminyumdaki \u00e7\u00f6z\u00fcn\u00fcrl\u00fc\u011f\u00fc \u00e7ok d\u00fc\u015f\u00fckt\u00fcr. Bu nedenle, kat\u0131la\u015fma s\u00fcreci s\u0131ras\u0131nda hidrojen \u00e7\u00f6kelmesiyle olu\u015fan g\u00f6zenekler, ala\u015f\u0131m\u0131n erime s\u0131cakl\u0131\u011f\u0131 ve erime s\u00fcresi ile daha yak\u0131ndan ili\u015fkilidir. Eritmenin sonraki a\u015famalar\u0131nda kontrol\u00fcn uygun olmamas\u0131 durumunda (\u00f6rne\u011fin, \u0131s\u0131tman\u0131n \u00e7ok h\u0131zl\u0131 veya \u00e7ok y\u00fcksek olmas\u0131 gibi), al\u00fcminyum s\u0131v\u0131s\u0131 taraf\u0131ndan emilen hidrojen miktar\u0131 fazla olur, hidrojen al\u00fcminyum s\u0131v\u0131s\u0131 i\u00e7inde daha yayg\u0131n bir \u015fekilde yay\u0131l\u0131r ve i\u011fne deli\u011fi olu\u015fma olas\u0131l\u0131\u011f\u0131 artar. D\u0131\u015f y\u00fczeye yak\u0131n b\u00f6lgelerde so\u011fuma daha h\u0131zl\u0131 oldu\u011fu i\u00e7in g\u00f6zenek say\u0131s\u0131 daha azd\u0131r. Baz\u0131 bilgilere g\u00f6re, 700\u2103'de 100 g al\u00fcminyumdaki hidrojen \u00e7\u00f6z\u00fcn\u00fcrl\u00fc\u011f\u00fc 0,5\uff5e0,9 cm\u00b3't\u00fcr. S\u0131cakl\u0131k 850 \u2103\u2019ye y\u00fckseldi\u011finde, hidrojenin \u00e7\u00f6z\u00fcn\u00fcrl\u00fc\u011f\u00fc 2 ila 3 kat artar. Bu nedenle, eritme i\u015flemi 750\u00b0C\u2019nin alt\u0131nda tutulmal\u0131 ve h\u0131zl\u0131 eritme \u00f6nerilmektedir; ancak \u0131s\u0131tma a\u015famas\u0131n\u0131n son evresinde s\u0131cakl\u0131\u011f\u0131n \u00e7ok h\u0131zl\u0131 y\u00fckselme sorunu kontrol alt\u0131na al\u0131nmal\u0131d\u0131r.<\/p>\n<p><strong>Operasyonel analiz <\/strong><\/p>\n<p>\u2460Dolgu temiz de\u011fil ve arka dolgunun pi\u015firme s\u00fcresi k\u0131sa.<\/p>\n<p>\u2461 D\u00f6k\u00fcm sisteminin tasar\u0131m\u0131ndaki kusurlar.<\/p>\n<p>\u2462Y\u00fcksek d\u00f6k\u00fcm s\u0131cakl\u0131\u011f\u0131 ve hatal\u0131 d\u00f6k\u00fcm i\u015flemi, gaz ve c\u00fcruf olu\u015fumuna neden olur.<\/p>\n<p>\u2463 Ar\u0131tma maddesi \u0131slak ve bozulma i\u015fleminin ard\u0131ndan bekletme s\u00fcresi yetersizdir.<\/p>\n<p>\u2464Hammaddenin \u00f6n \u0131s\u0131tmas\u0131 yetersiz ve \u00f6zensizdir.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5139\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Pinholes-1.jpg\" alt=\"Al\u00fcminyum \u0130\u011fne Delikleri\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Pinholes-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Pinholes-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Al\u00fcminyumda K\u00fc\u00e7\u00fck Deliklerin Giderilmesine Y\u00f6nelik \u00d6nlemler<\/strong><\/p>\n<p>Eritme i\u015flemi<\/p>\n<p>\u2460 Yeni malzeme ile geri d\u00f6n\u00fc\u015ft\u00fcr\u00fclm\u00fc\u015f malzeme aras\u0131ndaki oran\u0131 de\u011fi\u015ftirin; geri d\u00f6n\u00fc\u015ft\u00fcr\u00fclm\u00fc\u015f malzeme 30%, yeni malzeme ise 70% olsun.<\/p>\n<p>\u2461Ergitme s\u00fcrecini iyile\u015ftirin ve nem ile ya\u011f giri\u015fini \u00f6nlemek i\u00e7in kullan\u0131mdan \u00f6nce hammadde y\u00fczeyindeki pas, \u00e7amur ve di\u011fer kirleri temizleyin.<\/p>\n<p>\u2462G\u00f6zeneksiz veya daha az g\u00f6zenekli al\u00fcminyum d\u00f6k\u00fcmler elde etmek i\u00e7in, hammaddenin \u00f6n \u0131s\u0131t\u0131lmas\u0131 kilit \u00f6neme sahiptir. \u00d6n \u0131s\u0131tma s\u0131cakl\u0131\u011f\u0131 350\uff5e450\u2103 olup, bu s\u0131cakl\u0131k 3 saatten fazla s\u00fcreyle korunur. F\u0131r\u0131nlama (\u00f6n \u0131s\u0131tma) s\u00fcresi k\u0131sa olursa, d\u00f6k\u00fcm par\u00e7as\u0131n\u0131n kesitinde az say\u0131da k\u00fc\u00e7\u00fck ve da\u011f\u0131n\u0131k g\u00f6zenekler kal\u0131r.<\/p>\n<p>Ar\u0131tma maddesinin kurutulmas\u0131 ve \u00f6n \u0131s\u0131t\u0131lmas\u0131 b\u00fcy\u00fck avantajlar sa\u011flar. Ar\u0131tma i\u015fleminden sonra ve d\u00f6k\u00fcmden \u00f6nce, ala\u015f\u0131m s\u0131v\u0131s\u0131n\u0131n belirli bir s\u00fcre dinlendirilmesi gerekir; bunun amac\u0131, al\u00fcminyum s\u0131v\u0131s\u0131ndaki oksidasyon kal\u0131nt\u0131lar\u0131n\u0131 ve hidrojeni ortadan kald\u0131rmakt\u0131r. Ar\u0131tma maddesi \u0131slaksa, \u00e7ok miktarda hidrojen de i\u00e7eriye girer. Genel bak\u0131mdan ge\u00e7mi\u015f veya uzun s\u00fcredir kullan\u0131lmam\u0131\u015f f\u0131r\u0131nlar i\u00e7in, f\u0131r\u0131nlar\u0131n tamamen kurutulmas\u0131 gerekir; aksi takdirde, refrakterdeki nem buharla\u015farak nemli bir ortam olu\u015fturur ve bu da eritme s\u0131ras\u0131nda g\u00f6zenek olu\u015fumuna yol a\u00e7ar.<\/p>\n<p>Al\u00fcminyum ala\u015f\u0131ml\u0131 d\u00f6k\u00fcmlerdeki i\u011fne deliklerini ortadan kald\u0131rmak amac\u0131yla, eritme i\u015fleminde kullan\u0131lan pota, d\u00f6kme kab\u0131 olarak da kullan\u0131labilir. Pota, ar\u0131tma ve metamorfizma i\u015flemlerinden sonra d\u00f6k\u00fcm s\u0131cakl\u0131\u011f\u0131na getirildi\u011finde, ters \u00e7evrilmi\u015f d\u00f6kme kab\u0131ndan kaynaklanabilecek hava giri\u015fini \u00f6nlemek i\u00e7in pota elle kald\u0131r\u0131l\u0131r ve do\u011frudan d\u00f6k\u00fcl\u00fcr. Kullan\u0131lan aletler kullan\u0131mdan \u00f6nce temizlenmeli, ard\u0131ndan koruyucu kaplamalarla kaplanmal\u0131 ve \u00f6n \u0131s\u0131tma i\u015fleminden ge\u00e7irilip kurutulmal\u0131d\u0131r. Aksi takdirde, \u00f6n \u0131s\u0131tman\u0131n yetersiz kalmas\u0131 ve y\u00fczeyde nemin tutulmas\u0131, eritme ve d\u00f6k\u00fcm i\u015flemi s\u0131ras\u0131nda b\u00fcy\u00fck miktarda gaz olu\u015fmas\u0131na neden olarak d\u00f6k\u00fcmlerde pinholes olu\u015fmas\u0131na yol a\u00e7ar.<\/p>\n<p>Ayr\u0131ca, eritme i\u015flemi s\u0131ras\u0131nda \u00fczerini \u00f6rtmek i\u00e7in \u00f6zel bir \u00f6rt\u00fc maddesi kullan\u0131n. Gaz giderme-rafine etme-modifikasyon maddesi se\u00e7ilir ve ilave edilen miktar, erimi\u015f al\u00fcminyumun a\u011f\u0131rl\u0131\u011f\u0131n\u0131n 0,6%\u2019si kadard\u0131r. Kullan\u0131mdan \u00f6nce kurutulmas\u0131 gerekir. Ala\u015f\u0131m s\u0131v\u0131s\u0131n\u0131n s\u0131cakl\u0131\u011f\u0131 720 \u2103'ye ula\u015ft\u0131\u011f\u0131nda, paslanmaz \u00e7elik bir \u00e7an kavanozu kullanarak gaz giderme-rafine etme maddesini potan\u0131n taban\u0131na bast\u0131r\u0131n ve potan\u0131n i\u00e7 duvar\u0131 boyunca sabit bir h\u0131zda hareket ettirin; ayr\u0131ca her t\u00fcrl\u00fc kirin potaya girmesini \u00f6nleyin.<\/p>","protected":false},"excerpt":{"rendered":"<p>The main reason for aluminum pinholes: The higher the smelting temperature, the more serious the molten metal will absorb hydrogen from the humid air. The&hellip;<\/p>","protected":false},"author":1,"featured_media":5139,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5068","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminum Pinholes Treatment Measures in Casting Process<\/title>\n<meta name=\"description\" content=\"Aluminum Pinholes Treatment Measures: use a special covering agent to cover during the melting process. 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