Preparation of CaB6 powder via calciothermic reduction of boron carbide

The method of calciothermic reduction of B 4 C was proposed for preparing CaB 6 . The phase transition and morphology evolution during the reaction were investigated in detail. The experimental results reveal that Ca first reacts with B 4 C to generate CaB 2 C 2 and CaB 6 at a low temperature and th...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:International journal of minerals, metallurgy and materials metallurgy and materials, 2020, Vol.27 (1), p.37-45
Hauptverfasser: Wang, Yu, Zhang, Guo-hua, Wu, Yue-dong, He, Xin-bo
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The method of calciothermic reduction of B 4 C was proposed for preparing CaB 6 . The phase transition and morphology evolution during the reaction were investigated in detail. The experimental results reveal that Ca first reacts with B 4 C to generate CaB 2 C 2 and CaB 6 at a low temperature and that the CaB 2 C 2 subsequently reacts with Ca to produce CaB 6 and CaC 2 at a high temperature. After the products were leached to remove the byproduct CaC 2 , pure CaB 6 was obtained. The grain size of the prepared CaB 6 was 2–3 μm, whereas its particle size was 4–13 μm; it inherited the particle size of B4C. The residual C content of the product was decreased to 1.03wt% after the first reaction at 1173 K for 4 h and the second reaction at 1623 K for 4 h.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-019-1873-y