Reaction Mechanism of ZrB<sub>2</sub>-ZrC Formation in Ni-Zr-B<sub>4</sub>C System Analyzed by Differential Scanning Calorimetry
The reaction mechanism of ZrB<sub>2</sub>-ZrC formation in a 30% Ni-Zr-B<sub>4</sub>C system under argon was revealed by using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that the reaction mech...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/571222e8f21243f2b6ec6ac9f603254c |
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| Sumario: | The reaction mechanism of ZrB<sub>2</sub>-ZrC formation in a 30% Ni-Zr-B<sub>4</sub>C system under argon was revealed by using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that the reaction mechanism in the Ni-Zr-B<sub>4</sub>C system was complex. Initially, Ni<sub>x</sub>Zr<sub>y</sub> and Ni<sub>x</sub>B<sub>y</sub> intermetallics were formed via solid-state diffusion reactions between Ni, B<sub>4</sub>C and Zr. Then, the eutectic reaction between Ni<sub>2</sub>B and Ni<sub>4</sub>B<sub>3</sub> lead to the formation of Ni-B liquid. The free C atoms dissolved into the Ni-B liquid to form a Ni-B-C ternary liquid, and then part of the Zr powder dissolved into the surrounding Ni-B-C ternary liquid to form Ni-Zr-B-C quaternary liquid. Finally, ZrB<sub>2</sub> and ZrC formed and precipitated out of the saturated liquid. The eutectic liquid plays an important role during the formation of ZrB<sub>2</sub>-ZrC. |
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