Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.11889/4136
Title: | Thermal expansion of aluminum–fly ash cenosphere composites synthesized by pressure infiltration technique | Authors: | Al Araj, Simon Rohatgi, P. K. Gupta, N. |
Keywords: | Fly ash - Analysis;Aluminum alloys;Expansion (Heat) | Issue Date: | 2005 | Abstract: | The coefficients of thermal expansion (CTEs) of commercially available pure aluminum and aluminum alloy composites containing hollow fly ash particles (cenospheres) of average size 125 mm are measured using a dilatometer. Three types of composites are made using the pressure infiltration technique at applied pressures and infiltration times of 35 kPa for 3 min, 35 kPa for 7 min, and 62 kPa for 7 min. The volume fractions of the fly ash cenospheres in the composites are around 65%. The CTE of the composites is measured to be in the range of 13.1 106 –11 106 / C, which is lower than that of pure aluminum (25.3 106 / C). The infiltration processing conditions are found to influence the CTE of the composites. A higher applied pressure and a longer infiltration time lead to a lower CTE. The theoretical value of the CTE of fly ash cenospheres is estimated to be 6.1 106 / C. KEY | URI: | http://hdl.handle.net/20.500.11889/4136 |
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