The Effects of the Acid Treatment of ZrB2 Particles on Their Purity and Aqueous Dispersibility

Processes

Gye Seok An¹  Jinuk Choi² 

[1] Department of Advanced Materials Engineering, Kyonggi University, 154-42 Gwanggyosan-ro, Yeongtong-gu, Suwon 16227, Korea;Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea;

关键词: zirconium diboride;    acid-treatment;    zeta potential;    oxygen contents;    dispersibility;   

DOI  :  10.3390/pr10010018

来源: DOAJ

【 摘 要 】

Oxide impurities such as boria (B₂O₃) and zirconia (ZrO₂) on the surfaces of zirconium diboride (ZrB₂) particles are known to limit their sinterability. Among the impurities, B₂O₃ on the surface of ZrB₂ particles could be easily removed by methanol or hydrofluoric acid. However, the remaining ZrO₂ still gave negative influences on the sinterability. In this study, ZrB₂ particles were treated with various acids to remove oxide impurities on their surfaces. The acid treatments were found to vary in efficacy, according to acid type, and affect the crystallinity and morphology of ZrB₂ particles to varying degrees, in some cases forming additional impurities. In particular, the change in the oxygen content of the ZrB₂ particles induced by acid treatment was found to depend on the type of acid. The results of the acid treatments were compared which revealed that HNO₃ treatment optimizes the purity of ZrB₂ particles. In addition, the effects of acid treatment on the surface properties of ZrB₂ particles were considered. In particular, the correlation between the surface properties of the acid-treated ZrB₂ particles and their dispersibility in aqueous solution was investigated.

【 授权许可】

Unknown