Metal foaming by powder metallurgy process: investigation of different parameters on the foaming efficiency
Aluminium foams, produced by powder metallurgy process, have significant potential applications for uses in weight-sensitive structural parts. Problems in the production of metal foams arise from the lack of knowledge in the control of process parameters. The results are frequently uneven and un¬pre...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2019-10-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | https://www.fracturae.com/index.php/fis/article/view/2616/2759 |
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| Summary: | Aluminium foams, produced by powder metallurgy process, have significant potential applications for uses in weight-sensitive structural parts. Problems in the production of metal foams arise from the lack of knowledge in the control of process parameters. The results are frequently uneven and un¬predictable variations in the structure and properties of the final foamed parts are observed. This paper aims to investigate the effect of different para¬meters of the powder metallurgy with foaming agents process on the foaming efficiency. The parameters examined included the powder morpho¬logy, the compaction pressure and the foaming temperature. During the foaming stage, for each set of parameters the porosity-time (Pf-t) diagrams were created and the foaming efficiency was calculated (?=Pfmax). Results indicated that the highest foaming efficiency was observed at the specimens with the fine alu¬min¬ium powder, with high (700 MPa) compaction pressure and high foaming temperatures (800 oC). Finally, compression tests were per¬formed on the foamed specimens with the higher foaming efficiency in order to investigate their s-e response. Furthermore, average compressive strength and density were estimated and presented |
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| ISSN: | 1971-8993 |