On the Stability of c-BN-Reinforcing Particles in Ceramic Matrix Materials
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Heat Treatment of the Pure and Oxidized c-BN Powders
3.2. Heat Treatment of the c-BN–Si3N4 Composite with and without a Liquid Phase
3.3. Heat Treatment of c-BN–Glass Composites
4. Discussion
- Heat treatment of pure c-BN in an argon atmosphere yielded no transformation. In contrast, c-BN showed pronounced transformation to h-BN in the presence of B2O3 under the same conditions (Section 3.1).
- c-BN showed no conversion in pure Si3N4 powder at 1575 °C in the absence of a liquid phase, but transformation took place if an oxynitride liquid was formed in the presence of sintering additives (Section 3.2). The latter was also observed in previous experiments performed by the present authors [12,13,14].
- Heat treatment resulted in a much higher c-BN to h-BN transformation rate for mixtures of c-BN and oxide glasses of different compositions than for pure BN, even at 1400 °C and below. This transformation was influenced by the glass composition (Section 3.3).
4.1. Gas Phase Mechanism
4.2. Liquid Phase Mechanism
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
Appendix A
Solubility of c-BN/h-BN
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Sample | Glass Composition (wt %) | Tg (°C) | ||||||
---|---|---|---|---|---|---|---|---|
SiO2 | B2O3 | Al2O3 | MgO | CaO | BaO | Y2O3 | ||
G1 1 | 19.9 | 13.2 | 24.1 | - | - | - | 42.8 | 740 |
G2 2 | 15.6 | - | 20.5 | - | - | - | 63.9 | 890 |
G3 3 | 59.6 | 5.3 | 15.6 | 2.5 | 7.7 | 9.4 | - | 725 |
Temperature (°C) | Holding Time (h) | Phase Composition | ||
---|---|---|---|---|
G1-BN | G2-BN | G3-BN | ||
1400 | 1 | Amorphous | Mullite α-Y2Si2O7 γ-Y2Si2O7 | Amorphous |
1300 | 1 | Y(Al)BO3 (α-Al2O3) Al9BSi2O19 | Mullite Y2Si2O7 YAG SiO2 | Amorphous |
1300 | 10 | YBO3 (α-Al2O3) Al9BSi2O19 | Mullite Y2Si2O7 YAG SiO2 | Amorphous |
1200 | 10 | YBO3 Al9BSi2O19 α-Y2Si2O7 γ-Y2Si2O7 | Mullite, YAG Y2Si2O7, SiO2 α-Y2Si2O7 γ-Y2Si2O7 | Amorphous |
1100 | 10 | YBO3 α-Y2Si2O7 γ-Y2Si2O7 | Not investigated | SiO2 |
Temperature (°C) | Holding Time (h) | Content of h-BN/(h-BN+c-BN) (wt %) | ||
---|---|---|---|---|
G1-BN | G2-BN | G3-BN | ||
1400 | 1 | h-BN (24.6%) | h-BN (13.7%) | h-BN (12.2%) |
1300 | 1 | No h-BN | No h-BN | No h-BN |
1300 | 10 | h-BN (10.2%) | No h-BN | h-BN (6.7%) |
1200 | 10 | h-BN (0.6%) | No h-BN | h-BN (0.6%) |
1100 | 10 | No h-BN | Not investigated | No h-BN |
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Wolfrum, A.-K.; Matthey, B.; Michaelis, A.; Herrmann, M. On the Stability of c-BN-Reinforcing Particles in Ceramic Matrix Materials. Materials 2018, 11, 255. https://doi.org/10.3390/ma11020255
Wolfrum A-K, Matthey B, Michaelis A, Herrmann M. On the Stability of c-BN-Reinforcing Particles in Ceramic Matrix Materials. Materials. 2018; 11(2):255. https://doi.org/10.3390/ma11020255
Chicago/Turabian StyleWolfrum, Anne-Kathrin, Björn Matthey, Alexander Michaelis, and Mathias Herrmann. 2018. "On the Stability of c-BN-Reinforcing Particles in Ceramic Matrix Materials" Materials 11, no. 2: 255. https://doi.org/10.3390/ma11020255