An investigation of using sodium nitrate as a foaming agent of production closecell aluminum foam via Powder-Compact Foaming Technique

سال انتشار: 1395
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 368

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شناسه ملی سند علمی:

IIAC04_001

تاریخ نمایه سازی: 22 دی 1396

چکیده مقاله:

This article describes a named powder-Compact foaming technique to produce close cell aluminum foams. Porous Al was fabricated by decomposing of sodium nitrate powders at initial compacted precursor.At the first Al and NaNO3 powders were mixed together and then compacted to initial precursor. At the final theprecursor put in the sintering furnace. The gas released during sintering and also the mushy aluminum was the sourceof the produced pores. The effect of initial compacting pressure, heating temperature and weight ratio of powders havebeen investigated. Visual inspection and scanning electron microscopy (SEM) were utilized to characterize the poroussamples. Analyzing the properties of the aluminum foams showed that the optimum weight fraction for blending initialpowders was %2 wt. NaNO3. In addition, if the initial compacting pressure of the powders was decreased to below250MPa, the foaming process did not take place properly. The optimum time and temperature of this process were 15min at 680=C.

نویسندگان

A Moloodi

Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, P.O. Box: ۹۱۷۷۹-۴۹۳۶۷, Iran

A Babakhani

Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, P.O. Box: ۹۱۷۷۹-۴۹۳۶۷, Iran

M Haddad Sabzevar

Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, P.O. Box: ۹۱۷۷۹-۴۹۳۶۷, Iran