用六硼化钙还原氧化锆制备二硼化锆

IF 1.3 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Advances in Applied Ceramics Pub Date : 2022-11-17 DOI:10.1080/17436753.2022.2152595

Yu Wang, Yuehua Wu, Guo-hua Zhang, K. Chou

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引用次数: 0

摘要

二硼化锆(ZrB2)是一种典型的超高温陶瓷材料。本文对六硼化钙(CaB6)还原氧化锆(ZrO2)制备ZrB2进行了详细的研究。在熔盐的辅助下，还原速率显著提高。另外，通过改变熔盐类型(NaCl、KCl、MgCl2和CaCl2)，可以制备出不同颗粒形状的ZrB2产品。但以纳米zro2为原料时，产品的粒度不能得到适当的细化。在CaB6还原ZrO2的过程中，会形成B2O3，导致B源的损失。为了减少CaB6的消耗，采用ca辅助还原法制备了单相ZrB2。通过ca辅助还原得到的ZrB2颗粒形态的变化是复杂反应机制的结果。

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Preparation of zirconium diboride by reduction of zirconia with calcium hexaboride

ABSTRACT Zirconium diboride (ZrB2) is a typical ultra-high temperature ceramic material (UHTC). In this work, the preparation of ZrB2 by reducing zirconia (ZrO2) with calcium hexaboride (CaB6) was studied in detail. With the assistance of molten salt, the reduction rate was dramatically enhanced. Additionally, the results showed that ZrB2 products with different particle shapes were prepared by changing the type of molten salt (NaCl, KCl, MgCl2, and CaCl2). However, the particle size of products could not be properly refined when nano-ZrO2 was used as the raw material. During the process of reducing ZrO2 by CaB6, B2O3 could be formed, which would cause the loss of B source. To decrease the consumption of CaB6, Ca-assisted reduction was performed, and monophase ZrB2 was obtained. The varied morphologies of ZrB2 particles obtained by Ca-assisted reduction were the result of complex reaction mechanisms.

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来源期刊

Advances in Applied Ceramics 工程技术-材料科学：硅酸盐

CiteScore

4.40

自引率

4.50%

发文量

审稿时长

5.2 months

期刊介绍： Advances in Applied Ceramics: Structural, Functional and Bioceramics provides international coverage of high-quality research on functional ceramics, engineering ceramics and bioceramics.