MECHANICAL AND TRIBOLOGICAL PERFORMANCE OF Al-x SiC COMPOSITES PRODUCED BY POWDER METALLURGY TECHNIQUE FOR THROTTLE VALVES APPLICATIONS | ||||
| Journal of the Egyptian Society of Tribology | ||||
| Volume 21, Issue 3, July 2024, Page 55-73 PDF (831.42 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jest.2024.366467 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| A. M. I. Abu-Oqail; Ahmed M. Elmashad; Mohamed N. El-Sheikh; Moustafa M. Mohamed; M. Hassan A. El-Sayed* | ||||
| Production Technology Dept., Faculty of Technology and Education, Beni-Suef University, Beni-Suef, EGYPT. | ||||
| Abstract | ||||
| The present work aims to study the effect of SiC particles addition on the microstructural, mechanical, and tribological properties of Al/SiC composites produced by hot compaction powder metallurgy technique. High-energy planetary ball milling was used for mixing the pure Al powder with different SiC particles content of 2.5, 5, 7.5, and 10 wt.% at a speed of 350 rpm for 12 h. A hot compaction technique was used to produce the present Al/SiC composites at a pressure and temperature of 900 MPa and 550 ºC, respectively. Theoretical, actual, and relative densities as well as porosity percentages were measured. Scanning electron microscopy (SEM) was used to study the microstructural observations of present composites. Mechanical properties tests, which include microhardness and compression tests, were conducted at room temperature to estimate the Vickers microhardness number and ultimate compression strength of the present Al/SiC composites. Moreover, wear rate and friction coefficient tests, as tribological properties, of Al/SiC composites were investigated under dry sliding conditions by a pin-on-disc test rig. Based on the experimental results, all the mechanical and tribological properties showed significant improvement of pure Al with gradually increasing SiC content up to 10%. Relative density enhanced and reached the highest value of 98 % at 0.5 wt.% SiC content. Also, the microstructure examination showed that the dispersion of SiC particles within the Al matrix was good and uniform. Hence, Vickers microhardness number and ultimate compressive strength results of pure Al were enhanced by 66.5, and 50.53 %, respectively at SiC content of 5 wt.%. Moreover, the wear rate characteristics of Al/7.5 wt.% SiC composites were improved by 47.3, 47.6, and 40.9 % at applied loads of 5, 10, and 15 N, respectively compared to pure matrix Al. Finally, the friction coefficient of pure Al was improved and reached their optimum values at the SiC content of 5 wt.% under applied loads of 5, 10, and 15 N. | ||||
| Keywords | ||||
| Al−SiC composite; powder metallurgy; microstructure; mechanical properties, tribological properties | ||||
|
Statistics Article View: 15 PDF Download: 125 |
||||
