Synthesis and Characterization of Air-Sintered Al2O3-Bronze Composites |
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| Authors: | A Shrestha R Asthana T K Lacksonen M Singh |
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| Affiliation: | (1) DC Group Inc., Orlando, FL 32826, USA;(2) Department of Engineering and Technology, 326 Fryklund Hall, University of Wisconsin-Stout, Menomonie, WI 54751, USA;(3) Department of Operations, Construction and Management, University of Wisconsin-Stout, Menomonie, WI 54751, USA;(4) Ohio Aerospace Institute, Cleveland, OH 44135, USA; |
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| Abstract: | Powder blends of Al2O3 and a Cu-Sn-Pb bronze (0-20% bronze) were cold compacted and air-sintered at 1473-1773 K. The Al2O3-bronze composites exhibited networks of metal microchannels, some porosity, and diffusion of Pb in Al2O3 and of Al and O in bronze. The hardness of un-doped Al2O3 increased linearly with temperature, from 455 Knoop microhardness (HK) at 1473 K to 2010 HK at 1773 K, but the hardness of
the Al2O3/bronze composite exhibited a sluggish, nonlinear dependence on temperature, with a peak hardness of 1150 HK at 1673 K. Air
sintering may be viable to synthesize Al2O3/bronze composites with low bronze contents |
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