Composition versus Wear Behaviour of Air Plasma Sprayed NiCr–TiB2–ZrB2 Composite Coating
Abstract
:1. Introduction
2. Materials and Methods
2.1. Feedstock Materials
2.2. Powder Preparation
2.3. APS Spraying Experiments
2.4. Microstructural Characterisation
2.5. Performance Tests of Coatings
3. Results and Discussion
3.1. Microstructure and Phase Composition
3.2. Performance Test of Coatings
4. Conclusions
- With an increase in the proportion of ceramics, the microhardness of the composite coating gradually increased. The average hardness obtained on the coating cross-section was 753, 957, and 1102 HV0.1 for NiCr (5 wt.%)–TiB2 (5 wt.%)–ZrB2, NiCr (10 wt.%)–TiB2 (10 wt.%)–ZrB2, and NiCr (15 wt.%)–TiB2 (15 wt.%)–ZrB2 coatings.
- From the analyses of the Weibull distributions, the R value of all of the coatings was greater than 0.9 and there was little overall change of the coatings. With the addition of the ceramic phases (TiB2 and ZrB2), the β-values of the coatings rose from 67.39 to 134.28, implying that the coating had a minimal variation when the content of the ceramic phases (TiB2 and ZrB2) increased.
- The wear mechanism of the coatings was mixed, involving abrasive wear, adhesive wear, oxidation wear, and fatigue wear. The ceramic phases in the coatings gave outstanding resistance to wear and oxidation. The NiCr–15TiB2–15ZrB2 composite coating had the best tribological properties.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Materials | Purity | Zr | Ti | B | Cr | Ni | Fe | C | Others |
---|---|---|---|---|---|---|---|---|---|
NiCr | 99.0 | – | – | – | 19.86 | 80.08 | – | 0.01 | Bal. |
TiB2 | 99.5 | – | 68.23 | 30.75 | – | – | 0.14 | 0.13 | Bal. |
ZrB2 | 99.9 | 79.27 | – | 19.30 | – | – | 0.09 | 0.15 | Bal. |
SUS304 | – | – | – | – | 18.65 | 9.73 | 68.54 | 0.07 | Bal. |
Parameters | Value |
---|---|
Current (A) | 600 |
Voltage (V) | 40 |
Ar (dm3/s) | 0.67 |
H2 (dm3/s) | 0.17 |
Powder feed rate (g/s) | 0.58–0.75 |
Gun traverse speed (mm/s) | 90 |
Spray distance (mm) | 100 |
Pre-heating temperature (°C) | 120 |
Zone | Ni | Cr | Zr | Ti | B |
---|---|---|---|---|---|
A | – | – | – | 34.21 | 65.79 |
B | 72.43 | 15.98 | 0.24 | 0.62 | 10.73 |
C | 15.93 | 19.98 | 10.07 | 12.41 | 41.61 |
D | 29.95 | 14.95 | 10.71 | 7.82 | 36.57 |
E | 61.13 | 17.64 | 0.62 | 1.25 | 19.36 |
F | – | – | – | 36.47 | 63.53 |
G | 20.68 | 12.06 | 5.73 | 13.70 | 47.83 |
H | 65.43 | 14.91 | 0.11 | 0.83 | 18.72 |
I | – | – | – | 33.52 | 66.48 |
Zone | Ni | Cr | Ti | Zr | B | O |
---|---|---|---|---|---|---|
C | 47.86 | 12.69 | 2.86 | 1.29 | 18.36 | 16.94 |
E | 42.89 | 10.43 | 4.07 | 3.11 | 25.87 | 13.63 |
F | – | – | 33.54 | – | 66.46 | – |
I | – | – | 34.73 | – | 65.27 | – |
J | 35.97 | 8.54 | 5.66 | 3.29 | 34.72 | 11.82 |
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Zhang, N.; Zhang, N.; Guan, S.; Li, S.; Zhang, G.; Zhang, Y. Composition versus Wear Behaviour of Air Plasma Sprayed NiCr–TiB2–ZrB2 Composite Coating. Coatings 2018, 8, 273. https://doi.org/10.3390/coatings8080273
Zhang N, Zhang N, Guan S, Li S, Zhang G, Zhang Y. Composition versus Wear Behaviour of Air Plasma Sprayed NiCr–TiB2–ZrB2 Composite Coating. Coatings. 2018; 8(8):273. https://doi.org/10.3390/coatings8080273
Chicago/Turabian StyleZhang, Ning, Nannan Zhang, Sheng Guan, Shumei Li, Guangwei Zhang, and Yue Zhang. 2018. "Composition versus Wear Behaviour of Air Plasma Sprayed NiCr–TiB2–ZrB2 Composite Coating" Coatings 8, no. 8: 273. https://doi.org/10.3390/coatings8080273