Mahdi, Ahmed Sahib (2017) Effects of reinforcement materials and matrix particle sizes on mechanical properties and wear of recycled aluminum chips. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.
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Abstract
Recycling is the convert operation of the waste materials into objects and new materials. The objective of this study is to recycle AA6061 aluminum from the chip. Three particle sizes were used in this study. The smaller size of particle size 25 μm was gotten. A series of studies was conducted to determine the mechanical properties, physical properties, heat treatment process, and wear resistance and to develop model prediction of wear resistance with silica reinforcement. In the first study, three particle sizes 25, 63, and 100 μm, were sieved of the milled product to characterize its bulk properties of the compression strength. Results showed that the mix of 25 and 100 μm is the best compression strength. Then, two groups were selected to study the effect of mixture particles according to the size of particles, 25 +100 μm and 25 +63 μm. Higher value of compression strength was observed by using 25 + 100 μm which was 195.6 MPa. In the second study, heat treatment of the best compound was conducted to investigate the effect of the quenching and aging processes on compression strength. The heat treatment process was implanted with the quenching temperature of 530 °C for 2 h, thus the aging temperature is 175 °C with various aging holding time. Five aging holding times, namely, 2, 4, 6, 8, and 10 h, were selected. The optimal aging holding time is 4 h, then the compression strength was 300 MPa. Finally, wear test was conducted for the milled product. Three loads were used (5, 7.5 and 10 N) and three speed were used (300, 400 and 500 rpm). Four groups were classified for the wear test. The first group was the as-fabricated milled product. The second group was obtained by optimal heat treatment. The third group used graphite as a reinforcement material. The last group used silica as a reinforcement material. The results indicated that the specimens reinforced by silica material have the highest wear resistance (105×10-9 g/cm) because of their high microhardness value. The prediction of volume loss was developed based on the reinforcement of silica material. In conclusion, the recycling aluminum chips process is successfully done by using 25 + 100 μm particle size reinforced by silica, the prediction volume loss, Qpred was 5∗10−8× (L.S((398.83∗% Reinforcement)+79.22))−0.02.
| Item Type: | Thesis (Doctoral) |
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| Subjects: | T Technology > TD Environmental technology. Sanitary engineering > TD783-812.5 Municipal refuse. Solid wastes |
| Divisions: | Faculty of Mechanical and Manufacturing Engineering > Department of Mechanical Engineering |
| Depositing User: | Mrs. Sabarina Che Mat |
| Date Deposited: | 21 Jul 2021 03:07 |
| Last Modified: | 21 Jul 2021 03:07 |
| URI: | http://eprints.uthm.edu.my/id/eprint/293 |
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