A Study on the Effect of Ultrafine SiC Additions on Corrosion and Wear Performance of Alumina-Silicon Carbide Composite Material Produced by SPS Sintering
Abstract
:1. Introduction
2. Materials and Methods
2.1. Powder Production
2.2. Powder Characterisation
2.3. Spark Plasma Sintering (SPS)
2.4. Sintered Samples Characterisation
3. Results and Discussion
3.1. Powder Characteristics
3.2. Composite Response to SPS
3.3. Characteristics of the Sintered Composites
4. Conclusions
- Ultrafine particles were produced after milling, evident from the peak broadening observed during XRD analyses. The morphology of the mixed powders revealed Al2O3 matrix with small SiC particles evenly dispersed amongst much larger and agglomerated particles. A shift of the Al2O3 peaks during XRD showed that the presence of SiC particles altered the Al2O3 matrix after mechanical alloying.
- The addition of SiC increased temperature from the onset of densification. Furthermore, the addition of SiC delayed densification. In addition, the degree of agglomeration observed in the initial milling stage of the powders might have prolonged densification.
- The resistance to wear decreased with the addition of 15 vol.% of SiC. Additions of higher vol.% (20, 25, and 30) of SiC significantly improved the resistance to wear of Al2O3.
- The study’s composites showed no improvement in corrosion performance with increments in SiC additions.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Material | d10 (μm) | d50 (μm) | d90 (μm) |
---|---|---|---|
Before milling | |||
Al2O3 | 2.172 | 6.37 | 18.76 |
SiC | 26.77 | 48.01 | 82.63 |
After milling | |||
Al2O3 | 1.448 | 3.344 | 7.712 |
SiC | 0.063 | 0.120 | 0.245 |
Sample | Crystallite Size (nm) |
---|---|
Pure Al2O3 | 0.049 |
Al2O3-15SiC | 0.315 |
Al2O3-20SiC | 1.107 |
Al2O3-25SiC | 0.109 |
Al2O3-30SiC | 0.169 |
Sample | Theoretical Density (g/cm3) | Bulk Density (g/cm3) | Relative Density (%) | Average Grain Size (µm) |
---|---|---|---|---|
Pure Al2O3 | 3.97 | 3.939 | 99.2 | 15.5 |
Al2O3-15SiC | 3.82 | 3.797 | 99.4 | 2.0 |
Al2O3-20SiC | 3.78 | 3.789 | 100 | 2.3 |
Al2O3-25SiC | 3.73 | 3.724 | 99.8 | 49.8 |
Al2O3-30SiC | 3.73 | 3.638 | 97.5 | 43.3 |
Sample | Approximate Wear Track Size (µm) |
---|---|
Pure Al2O3 | 2324 |
Al2O3-15SiC | 375 |
Al2O3-20SiC | 637 |
Al2O3-25SiC | 823 |
Al2O3-30SiC | 1242 |
Sample | Ecorr (V) | Icorr (A/cm2) |
---|---|---|
Al2O3-15SiC | −0.731 | 2.433 × 10−8 |
Al2O3-20SiC | −0.499 | 3.841 × 10−9 |
Al2O3-25SiC | −0.556 | 9.577 × 10−9 |
Al2O3-30SiC | −0.694 | 9.577 × 10−9 |
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Mogale, N.F.; Matizamhuka, W.R. A Study on the Effect of Ultrafine SiC Additions on Corrosion and Wear Performance of Alumina-Silicon Carbide Composite Material Produced by SPS Sintering. Metals 2020, 10, 1337. https://doi.org/10.3390/met10101337
Mogale NF, Matizamhuka WR. A Study on the Effect of Ultrafine SiC Additions on Corrosion and Wear Performance of Alumina-Silicon Carbide Composite Material Produced by SPS Sintering. Metals. 2020; 10(10):1337. https://doi.org/10.3390/met10101337
Chicago/Turabian StyleMogale, Ntebogeng F., and Wallace R. Matizamhuka. 2020. "A Study on the Effect of Ultrafine SiC Additions on Corrosion and Wear Performance of Alumina-Silicon Carbide Composite Material Produced by SPS Sintering" Metals 10, no. 10: 1337. https://doi.org/10.3390/met10101337