(Hf0.99Ta0.01)B2-based ceramics prepared by pressureless sintering with boron additive. Issue 6 (15th March 2022)

• Record Type: Journal Article
• Authors: Zhan, Chuang-Tian; Zhang, Yan; Guo, Wei-Ming; Xu, Liang; You, Yang; Plucknett, Kevin; Lin, Hua-Tay
• Is Part Of: Ceramics international. Volume 48:Issue 6(2022)
• Page Start: 8605
• Page End: 8611
• Publication Date: 2022-03-15
• Subjects: HfB2-Based ceramics -- Pressureless sintering -- Densification -- Microstructure -- Mechanical properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.12.071
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: HfB2 -based ceramics were fabricated by pressureless sintering with the combination of TaB2 /B. It was found that the incorporation of TaB2 reduced the particle size of the HfB2 -based powders prepared by borothermal reduction, but the densification of pressureless sintered HfB2 ceramics was slightly improved (from 63.2% to 69.4%). It was revealed that the combination of TaB2 and 5 wt% B could dramatically improve the sinterability of HfB2 ceramics. In combination of TaB2 and B, the relative density of HfB2 -based ceramics increased significantly from 63.2% to 92.3%, and further reached to 97.2% with increasing fraction of TaB2 . Finally, (Hf0.99 Ta0.01 )B2 -5 wt% B ceramics displayed the favorable mechanical properties (Hardness: 18.1 ± 0.6 GPa).