Abstract
Ergimis magnezyumun korunmasi, mevcut ve potansiyel magnezyum kullanicilari icin en onemli konulardan biridir. Pahali metal kayiplarinin en az seviyeye indirilmesinin yani sira guvenlik gibi nedenlerinden de oturu, etkili bir ergiyik koruma sistemi gereklidir. SF6, son derece yuksek bir kuresel isinma potansiyeline sahip oldugundan, HFC-134a bircok uygulamada etkili bir cozumdur. Bu calismada, HFC-134a/N2 atmosferi altinda ergimis AZ91A alasiminda olusan yuzey filmleri, farkli ergimis metal sicakliklari, temas sureleri, konsantrasyonlari ve koruyucu gaz debileri gibi cesitli parametrelerde incelenmektedir. Optimum islem parametrelerinin belirlenmesi icin Taguchi deneysel tasarim yontemi kullanilmistir. Deneyler neticesinde elde edilen yuzey filmleri optik mikroskop ile analiz edilmistir. Proses parametrelerinin ergiyik uzerinde en iyi koruyucu tabaka saglayanlari; 60 dakikalik temas suresi, 660 °C ergimis magnezyum sicakligi, % 0.30 hacimsel gaz konsantrasyon ve 600 l/h'lik koruyucu gaz karisim debisi olarak belirlenmistir.
Highlights
It is globally known that magnesium alloys shows a relatively high specific strength and good specific stiffness resulting from their low density [1]
Surface films formed on molten AZ91A alloy under HFC-134a/N2 atmosphere are examined in various parameters such as molten metal temperatures, exposure times, concentrations and flow rates of the protective gases
In literature, understanding of the mechanism of SF6, a melting technology in a sealed furnace was proposed, and the protection behavior of magnesium alloys in the sealed melting furnace was investigated under the protective atmosphere containing HFC-134a [7]
Summary
It is globally known that magnesium alloys shows a relatively high specific strength and good specific stiffness resulting from their low density [1]. This film does not protect the magnesium melt and its alloys from oxidation It even burns at high temperatures of melting and casting processes [2]. That, it needs to protect the molten magnesium from oxidation. Some remarkable studies have indicated HFC-134a contained cover gas mixtures They mentioned that these mixtures can provide an effective protection for molten magnesium and its alloys. The developed gas HFC-134a (1,1,1,2Tetrafluoroethane, CF3CH2F) is considered a good solution against SF6 contained cover gases. These studies have mentioned about HFC-134a contented cover gas mixtures’ effective protection capability for molten magnesium alloys in detail. The protection behavior of AZ91D alloy in a sealed melting furnace was investigated under the atmosphere containing SO2 with different mixed gases [8]
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