In Situ Ternary Boride: Effects on Densification Process and Mechanical Properties of WC-Co Composite Coating
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation of Composite Powder
2.2. Preparation of Coatings
2.3. Analysis
3. Results and Discussion
3.1. Characterization of the Raw Materials
3.2. Characterization of the Prepared Composite Powders
3.3. Effect of Mo–B4C on the Morphology and Densification Process of the Coating
3.4. Microstructural Evolution of Coating
3.5. Mechanical Property Evolution of Coating by Mo–B4C Addition
3.6. Corrosion Resistance Property Evolution of Coating by Mo–B4C Addition
4. Conclusions
- Composite powders of different proportions of Mo–B4C, WC, and Co were prepared by mixing, granulation, and heat treatment. When a small amount of Mo–B4C was added, it reacted with Co to produce ternary borides CoMo2B2 and CoMoB. When Mo–B4C was added to excess, Mo and B4C further reacted to generate MoB and MoB2.
- Boride ceramics were formed in situ to replace part of the Co bonding phase to improve corrosion resistance. When the amount of Mo–B4C added was 35.2%, some pores were present in the composite powder, but the combination between components was good. When Mo–B4C was added to excess, then numerous pores were visible in the composite powder, and the combination of particles was poor.
- When the amount of Mo–B4C was 35.2%, the mechanical properties of the prepared coating reached optimal values: minimum porosity of 0.31 ± 0.15%, bonding strength of 77.81 ± 1.77 Mpa, nanoindentation hardness of 20.12 ± 1.85 GPa, Young’s modulus of 281.52 ± 30.22 GPa, and fracture toughness of 6.38 ± 0.45 MPa·m1/2.
- The strengthening mechanism of Mo–B4C in WC–Co composite coatings was as follows: the addition of Mo–B4C reacted with Co to form ternary borides CoMo2B2 and CoMoB. Owing to the in-situ reaction, a perfect interface formed between Co and ternary boride. Simultaneously, ternary boride also formed a perfect interface with Mo and WC of a particular crystallographic orientation. Therefore, the addition of Mo–B4C improved the interface with WC–Co, forming a dense microstructure. This change improved the mechanical properties and corrosion resistance property of the coating.
Author Contributions
Funding
Conflicts of Interest
References
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Sample | WC | Mo, B4C | Co | ||
---|---|---|---|---|---|
Mo + B4C | Mo | B4C | |||
1# | 0 | 88.0 | 78.8 | 9.2 | 12.0 |
2# | 17.6 | 70.4 | 63.1 | 7.3 | 12.0 |
3# | 35.2 | 52.8 | 47.3 | 5.5 | 12.0 |
4# | 52.8 | 35.2 | 31.5 | 3.7 | 12.0 |
5# | 70.4 | 17.6 | 15.8 | 1.8 | 12.0 |
6# | 88.0 | 0 | 0 | 0 | 12.0 |
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Bao, J.; Yu, Y.; Liu, B.; Jia, C.; Wu, C. In Situ Ternary Boride: Effects on Densification Process and Mechanical Properties of WC-Co Composite Coating. Materials 2020, 13, 1995. https://doi.org/10.3390/ma13081995
Bao J, Yu Y, Liu B, Jia C, Wu C. In Situ Ternary Boride: Effects on Densification Process and Mechanical Properties of WC-Co Composite Coating. Materials. 2020; 13(8):1995. https://doi.org/10.3390/ma13081995
Chicago/Turabian StyleBao, Junfeng, Yueguang Yu, Bowen Liu, Chengchang Jia, and Chao Wu. 2020. "In Situ Ternary Boride: Effects on Densification Process and Mechanical Properties of WC-Co Composite Coating" Materials 13, no. 8: 1995. https://doi.org/10.3390/ma13081995