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Volume 14
Issue 21
10.3390/ma14216467
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Article

Reaction Mechanism of ZrB2-ZrC Formation in Ni-Zr-B4C System Analyzed by Differential Scanning Calorimetry

by
Jiaying Xu
1,*,
Pengfei Ma
1 and
Binglin Zou
2
1
Jilin Institute of Chemical Technology, College of Science, Jilin 132022, China
2
State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
*
Author to whom correspondence should be addressed.
Materials 2021, 14(21), 6467; https://doi.org/10.3390/ma14216467
Submission received: 16 September 2021 / Revised: 20 October 2021 / Accepted: 26 October 2021 / Published: 28 October 2021
(This article belongs to the Topic Metallurgical and Materials Engineering)
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Abstract

The reaction mechanism of ZrB2-ZrC formation in a 30% Ni-Zr-B4C 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-B4C system was complex. Initially, NixZry and NixBy intermetallics were formed via solid-state diffusion reactions between Ni, B4C and Zr. Then, the eutectic reaction between Ni2B and Ni4B3 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, ZrB2 and ZrC formed and precipitated out of the saturated liquid. The eutectic liquid plays an important role during the formation of ZrB2-ZrC.
Keywords: reaction mechanism; ZrB2-ZrC; combustion synthesis; self-propagation high-temperature synthesis; differential scanning calorimetry reaction mechanism; ZrB2-ZrC; combustion synthesis; self-propagation high-temperature synthesis; differential scanning calorimetry

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MDPI and ACS Style

Xu, J.; Ma, P.; Zou, B. Reaction Mechanism of ZrB2-ZrC Formation in Ni-Zr-B4C System Analyzed by Differential Scanning Calorimetry. Materials 2021, 14, 6467. https://doi.org/10.3390/ma14216467

AMA Style

Xu J, Ma P, Zou B. Reaction Mechanism of ZrB2-ZrC Formation in Ni-Zr-B4C System Analyzed by Differential Scanning Calorimetry. Materials. 2021; 14(21):6467. https://doi.org/10.3390/ma14216467

Chicago/Turabian Style

Xu, Jiaying, Pengfei Ma, and Binglin Zou. 2021. "Reaction Mechanism of ZrB2-ZrC Formation in Ni-Zr-B4C System Analyzed by Differential Scanning Calorimetry" Materials 14, no. 21: 6467. https://doi.org/10.3390/ma14216467

APA Style

Xu, J., Ma, P., & Zou, B. (2021). Reaction Mechanism of ZrB2-ZrC Formation in Ni-Zr-B4C System Analyzed by Differential Scanning Calorimetry. Materials, 14(21), 6467. https://doi.org/10.3390/ma14216467

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