Abstract
The influence of the addition of organic compounds, such as palmitic acid and cholesteryl myristate, on the porous structure of Fe-Al intermetallics formation has been investigated in detail in this paper. It was found that additives have a significant effect on the final porosity of the obtained sinters. Formed gaseous products from combustion play the role of the foaming agent during Fe-Al intermetallic alloy sintering. The influence of these additives is also clearly noticeable in chemical composition changes of the final products through the increase of carbon content in the porous structure. This is attributed to the thermal decomposition, namely combustion, of the organic additives.
Highlights
Metal foams have potential for a variety of applications, such as ultra-light weight structural components, heat insulation, and energy absorbers
Two additives were used in the present study: palmitic acid (PA) and cholesteryl myristate (CM), which allowed the formation of highly porous materials thanks to their volumetric expansion during combustion
In order to determine the porosity of obtained sinters, the samples were observed with the use of optical microscopy and subsequently analyzed with an NIS-Elements image analyzer connected with Nikon MA200 microscope (Nikon, Chiyoda, Tokyo, Japan)
Summary
Metal foams have potential for a variety of applications, such as ultra-light weight structural components, heat insulation, and energy absorbers. Intermetallic Fe-Al phase-based sintered porous materials constitute a promising group of modern engineering materials due to their attractive physical and mechanical properties, as well as the low cost of the raw elements [4,5,6,7,8,9]. There are a number of parameters that affect the SHS reaction, such as: method of compact preparation, powder particle size and shape, reaction atmosphere, and heating rate [14,15,16] These parameters allow to control SHS only at a limited range, what translates into diffusion in the solid state. Two additives were used in the present study: palmitic acid (PA) and cholesteryl myristate (CM), which allowed the formation of highly porous materials thanks to their volumetric expansion during combustion
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