Carbon nanotube induced microstructural characteristics in powder metallurgy Al matrix composites and their effects on mechanical and conductive properties

We have synthesized multi-wall carbon nanotube (MWCNT)-reinforced Al matrix composites. The Al/MWCNT composite powders were prepared by ball milling using pristine Al or ball-milled Al powders as starting materials. The composite powders were consolidated by a conventional cold-compaction, followed by sintering. Uniform dispersion of individual MWCNTs within the matrix was in particular a critical factor for obtaining high density and high quality Al/MWCNT composites. Compared to pristine Al powders as starting materials, the Al powders previously attrition-ball-milled with carbon-based PCA (process control agent) in an ammonia atmosphere resulted in a better distribution of carbon nanotubes within the Al matrix and a higher density after sintering.

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An approach for homogeneous carbon nanotube dispersion in Al matrix composites

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2015.02.003 ◽

2015 ◽

Vol 72 ◽

pp. 1-8 ◽

Cited By ~ 102

Author(s):

Biao Chen ◽

Shufeng Li ◽

Hisashi Imai ◽

Lei Jia ◽

Junko Umeda ◽

...

Keyword(s):

Carbon Nanotube ◽

Matrix Composites ◽

Carbon Nanotube Dispersion ◽

Al Matrix Composites ◽

Nanotube Dispersion ◽

Al Matrix

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Investigation of microstructure and wear behaviors of al matrix composites reinforced by carbon nanotube

Fullerenes Nanotubes and Carbon Nanostructures ◽

10.1080/1536383x.2016.1182504 ◽

2016 ◽

Vol 24 (7) ◽

pp. 467-473 ◽

Cited By ~ 9

Author(s):

Musa Yildirim ◽

Dursun Özyürek ◽

Metin Gürü

Keyword(s):

Carbon Nanotube ◽

Matrix Composites ◽

Al Matrix Composites ◽

Al Matrix

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Mechanical and Electrical Properties of Nano Al-Matrix Composites Reinforced with SiC and Prepared by Powder Metallurgy

Biointerface Research in Applied Chemistry ◽

10.33263/briac122.20682083 ◽

2021 ◽

Vol 12 (2) ◽

pp. 2068-2083

Keyword(s):

Mechanical Properties ◽

Electrical Conductivity ◽

Compressive Strength ◽

Electron Microscope ◽

Powder Metallurgy ◽

Relative Density ◽

Apparent Porosity ◽

Matrix Composites ◽

Al Matrix Composites ◽

Al Matrix

Nano Al-matrix composites reinforced with SiC were prepared by powder metallurgy process. The percentages of added SiC were varied between 0, 2, 4, 6, and 8 wt. %. The starting powders were milled in high-energy ball mill for 10hrs to convert into nanopowders; then compacted and sintered for 1h in an argon atmosphere at 400, 500, and 570°C. X-ray technique and transmission electron-microscope were utilized to examine the prepared powders, while scanning electron-microscope was utilized to test the sintered composites. The relative density, apparent porosity, electrical conductivity, and mechanical properties (microhardness, elastic moduli, and compressive strength) of sintered composites were studied. The results showed no sign for phase changes after milling, and the SiC reinforcement was uniformly distributed in the matrix. The relative density and electrical conductivity were decreased with increasing SiC content, while the apparent porosity was increased. It is also found that the mechanical properties were improved with increasing SiC content. Also, all properties were improved with increasing sintering temperature. The hardness, compressive strength, bulk modulus of Al-8wt.% SiC composite sintered at 570°C were 885.4 MPa, 276.2 MPa, and 135.9 GPa, respectively.

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