Characterization of Feedstocks for Injection Molded SiCp-Reinforced Al-4.5 wt.%Cu Composite

Tapany Udomphol; Benchawan Inpanya; Nutthita Chuankrerkkul

doi:10.4028/www.scientific.net/AMR.383-390.3234

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 383-390Characterization of Feedstocks for Injection...

Characterization of Feedstocks for Injection Molded SiC_p-Reinforced Al-4.5 wt.%Cu Composite

Abstract:

Characterization of feedstocks for powder injection molding of SiC_p-reinforced aluminium composite, as potential use for automotive and light-weight applications, has been studied in this research. Al-4.5 wt.% Cu powder, SiC_p and polymeric binder were pre-mixed and compounded using a twin screw extruder at 170oC prior to powder injection molding at 170 oC. Effects of varied solid loadings at 52, 55 and 58% on green properties of the feedstocks have been investigated. Experimental results showed that compounding followed by powder injection molding allowed uniform distribution of SiC_p surrounding the aluminium powder. It was found that higher solid loading improved bulk density while hardness values were observed to be similar. Molded specimens of 55% solid loading provided the optimum bend strength and strain at failure. Moreover, it was observed that the opposing abrasive property with angular shape of SiC_p resulted in SiC_p scratching effect, leading to irregular surface of aluminium powder after injection molding. This consequence and molding porosity were expected to be responsible for relatively low density of the molded specimens, giving the difficulty in molding at higher solid loading.

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Periodical:

Advanced Materials Research (Volumes 383-390)

Pages:

3234-3240

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.383-390.3234

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Online since:

November 2011

Authors:

Tapany Udomphol, Benchawan Inpanya, Nutthita Chuankrerkkul

Keywords:

Aluminum (Al), Composite, Hardness, Injection, Microstructure, Powder, Silicon Carbide (SiC), Strength

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