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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 10    October 2019

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Preparation of wettable TiB2-TiB/Ti cathode by electrolytic boronizing for aluminum electrolytic
HUANG You-guo(黄有国)1, WANG Yi(王益)1, ZHANG Xiao-hui(张晓辉)2, WANG Hong-qiang(王红强)1, LI Qing-yu(李庆余)1

1. Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China;
2. Guangxi Key Laboratory of Comprehensive Utilization of Calcium Carbonate Resources, College of Materials and Environmental Engineering, Hezhou University, Hezhou 542899, China

Abstract:According to the problems of short life and low strength of TiB2 coating cathode for current technology in aluminium electrolysis industry, this work synthesized TiB2-TiB/Ti gradient composite with TiB2 coating and TiB whiskers in metallic Ti matrix by a electrolytic boronizing method based on similar density and thermal expansivity of the three materials. The phase composition and morphology of the cross-section were determined by X-ray diffraction (XRD), scanning electronic microscope (SEM) and X-ray energy dispersive spectrum (EDS). The results show that uniform TiB2 layer with a thickness of 8-10 μm is continuously coated on the surface while the TiB whisker connected with TiB2 layer was embedded dispersedly into the matrix. The TiB crystal whisker has a maximum length of about 220 μm. The growth rate of TiB2 and TiB is enhanced by the strong reduction of B4C. The novel gradient design of the composite helps to extend life and improve strength of the TiB2 cathode in aluminium electrolysis.

 

Key words: aluminium electrolysis; electrolytic boronizing; titanium diboride; gradient materials

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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