UHMWPE Nanocomposite Coatings Reinforced with Alumina (Al2O3) Nanoparticles for Tribological Applications
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation of Nanocomposite Powders
2.2. Coating Procedure
2.3. Characterization Techniques
3. Results and Discussion
3.1. Dispersion Analysis of Alumina Nano Filler in UHMWPE Polymer Matrix Using FESEM/EDS Elemental Mapping
3.2. Evaluation of Thickness of the Pristine and the Nanocomposite Coatings
3.3. Evaluation of Hardness of the Pristine and the Nanocomposite Coatings
3.4. Tribological Performance of the Pristine UHMWPE Coatings
3.5. Tribological Performance of the UHMWPE Nanocomposite Coatings with Different Loadings of Alumina
3.6. Evaluation of Tribological Performance of the 3 and 5 wt % Alumina-Reinforced UHMWPE Nanocomposite Coating for Increased Number of Cycles
3.7. Evaluation of Tribological Performance of the 3 and 5 wt % Alumina-Reinforced UHMWPE Nanocomposite Coating at Increased Normal Load
4. Conclusions
- Microhardness of the nanocomposite coatings increased with increasing content of alumina. However, large variations were observed in the hardness measurements on the UHMWPE nanocomposite coating reinforced with 10 wt % of alumina. This is attributed to the formation of two-phase system (soft and hard) in the coating, due to the agglomeration of the alumina nanoparticles.
- In general, all the nanocomposite coatings showed better wear resistance as compared to the pristine UHMWPE coating at a load of 12 N. However, among them, nanocomposite coatings with 3 and 5 wt % exhibited the highest wear resistance as they did not fail even until 250,000 cycles at a load of 12 N. This is attributed to the superior mechanical properties of alumina, and its uniform dispersion in the polymer matrix.
- However, both the 3 and 5 wt % alumina nanocomposite coatings failed at an increased load of 15 N, suggesting that both the coatings cannot withstand such a high load.
- The predominant modes of failure mechanisms of the coatings were found to be a combination of severe adhesive and abrasive wear, and in case of the coatings with no failure, the wear mechanism was found to be simple plastic deformation.
Funding
Conflicts of Interest
References
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Mohammed, A.S. UHMWPE Nanocomposite Coatings Reinforced with Alumina (Al2O3) Nanoparticles for Tribological Applications. Coatings 2018, 8, 280. https://doi.org/10.3390/coatings8080280
Mohammed AS. UHMWPE Nanocomposite Coatings Reinforced with Alumina (Al2O3) Nanoparticles for Tribological Applications. Coatings. 2018; 8(8):280. https://doi.org/10.3390/coatings8080280
Chicago/Turabian StyleMohammed, Abdul Samad. 2018. "UHMWPE Nanocomposite Coatings Reinforced with Alumina (Al2O3) Nanoparticles for Tribological Applications" Coatings 8, no. 8: 280. https://doi.org/10.3390/coatings8080280