Toz ak\u0131 maddeleri, d\u00f6k\u00fcm \u00f6ncesinde al\u00fcminyum ve silikonun erimi\u015f kar\u0131\u015f\u0131m\u0131n\u0131 ar\u0131nd\u0131rabilir. Toz ak\u0131 maddeleri karbonat ve flor\u00fcr i\u00e7erir.<\/p>\n
D\u00f6k\u00fcmler, 12,5% ila 25,0% silikon i\u00e7eren al\u00fcminyum-silikon ala\u015f\u0131mlar\u0131ndan \u00fcretilir ve saf al\u00fcminyumdan yap\u0131lan ala\u015f\u0131mlara k\u0131yasla daha iyi mukavemet ve s\u00fcneklik g\u00f6sterir. Bu nedenle, silikon i\u00e7eri\u011fi daha d\u00fc\u015f\u00fck olanlara g\u00f6re daha iyi a\u015f\u0131nma direnci sergilerler. Bu ala\u015f\u0131m, m\u00fckemmel a\u015f\u0131nma direncine sahiptir ve otomobil motorlar\u0131 ile pistonlar gibi a\u011f\u0131r par\u00e7alar\u0131n d\u00f6k\u00fcm\u00fcne uygundur.<\/p>\n
D\u00f6k\u00fcm uygun bulunursa, d\u00f6k\u00fcm\u00fcn kristal taneleri belirgin kusurlar i\u00e7ermemelidir. Bu kusur, al\u00fcminyum-silikon ala\u015f\u0131m\u0131ndaki hidrojen ve oksitler gibi safs\u0131zl\u0131klardan kaynaklan\u0131r. Ayr\u0131ca, birincil silikon par\u00e7ac\u0131klar\u0131n\u0131n topaklanabilmesi de bu kusurun nedenlerinden biridir; bunun sonucunda par\u00e7ac\u0131klar b\u00fcy\u00fcr ve d\u00f6k\u00fcm i\u00e7inde d\u00fczensiz bir \u015fekilde da\u011f\u0131l\u0131r.<\/p>\n
D\u00f6k\u00fcmdeki bu kusurlar, d\u00f6k\u00fcm\u00fcn k\u0131r\u0131lganla\u015fmas\u0131na neden olabilir ve i\u015fleme s\u0131ras\u0131nda d\u00f6k\u00fcmde ufak k\u0131r\u0131klar veya \u00e7atlaklar olu\u015fabilir. Ayr\u0131ca, tak\u0131m tezgah\u0131n\u0131n \u00f6mr\u00fcn\u00fcn k\u0131salmas\u0131na ve \u00fcretim kesintilerine yol a\u00e7abilir.<\/p>\n
Bu nedenle, al\u00fcminyum ala\u015f\u0131m\u0131 eriyi\u011finde ak\u0131 ar\u0131tmas\u0131, d\u00f6k\u00fcmlerin fiziksel \u00f6zelliklerini ve i\u015flenebilirli\u011fini iyile\u015ftirmek a\u00e7\u0131s\u0131ndan \u00f6nemlidir. Al\u00fcminyum-silikon ala\u015f\u0131m\u0131ndaki \u00e7e\u015fitli safs\u0131zl\u0131klar\u0131 gidermek i\u00e7in genellikle \u00f6nce hidrojen, ard\u0131ndan da oksit safs\u0131zl\u0131klar\u0131 giderilir.<\/p>\n
Karbonatlar bilinen maddelerdir ve i\u015flevleri, ak\u0131\u015fkanl\u0131\u011f\u0131 art\u0131rmak ve i\u015fleme s\u0131ras\u0131nda toz halindeki ak\u0131\u015fkan\u0131n topaklanmas\u0131n\u0131 \u00f6nlemektir. Flor\u00fcr\u00fcn i\u015flevi ise erimi\u015f al\u00fcminyum ve silikon kar\u0131\u015f\u0131m\u0131ndaki oksit safs\u0131zl\u0131klar\u0131n\u0131 gidererek bunlar\u0131n erimi\u015f al\u00fcminyum ve silikon kar\u0131\u015f\u0131m\u0131n\u0131n y\u00fczeyine \u00e7\u0131kmas\u0131n\u0131 ve buradan uzakla\u015ft\u0131r\u0131lmas\u0131n\u0131 sa\u011flamakt\u0131r. Ayr\u0131ca hidrojenin giderilmesine de yard\u0131mc\u0131 olurlar.<\/p>\n