Nitridation of AL-Mg-Si alloys through dynamic heating = Penitridaan aloi AL-Mg-Si secara pemanasan dinamik

Roslinda Shamsudin, and Saiful Rizam Shamsuddin, and Abdul Razak Daud, and Muhammad Azmi Abdul Hamid, (2007) Nitridation of AL-Mg-Si alloys through dynamic heating = Penitridaan aloi AL-Mg-Si secara pemanasan dinamik. Sains Malaysiana, 36 (2). pp. 195-200. ISSN 0126-6039

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Abstract

Nitridation behaviour of Al-Mg-Si alloys was studied as a function of temperature by means of thermogravimetry method. A reactive gas, N2-4%H2 at a rate of 10 ml/min was purged into the thermogravimetry analyser chamber. The Al alloys were heated from 25oC to 625oC at the heating rate of 15oC/min and then reduced to 3oC/min until it reached 1500oC. It was found that by varying the amount of Mg and Si in Al-Mg-Si alloys significantly influenced the growth of the composites. A differential thermogravimetric curve shows the Mg containing alloys experienced many steps of chemical reactions. This indicates that besides AlN presence as a major phase, other compounds also exist in the final product. The X-ray diffraction results confirmed the existence of oxide phases such as !-Al2O3, MgAl2O4 and MgO in addition to residual Si and Al metal. The presence of oxide compounds is believed to be due to the reaction between the alloying elements and residual oxygen gas left in the reaction atmosphere. It was also found that Si could play a role in promoting the weight gain of the composite produced. The heating rate has also a profound effect on the weight gain, whereby higher heating rate resulted in low yielded of AlN during the nitridation reaction of the Al-Mg-Si alloys.

Item Type:Article
Keywords:Thermogravitmetry; nitridation; dynamic heating; AlN
Journal:Sains Malaysiana
ID Code:105
Deposited By: Mr Fazli Nafiah -
Deposited On:18 Oct 2010 07:54
Last Modified:14 Dec 2016 06:26

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