Improvement of sinterability and mechanical properties of ZrB2 ceramics by the modified borothermal reduction methods. Issue 12 (September 2020)

• Record Type: Journal Article
• Authors: Liu, Qiu-Yu; Sun, Shi-Kuan; Zeng, Ling-Yong; You, Yang; Guo, Wei-Ming; Wu, Li-Xiang; Lin, Hua-Tay
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 12(2020)
• Page Start: 3844
• Page End: 3850
• Publication Date: 2020-09
• Subjects: ZrB2 -- Borothermal reduction -- Sintering -- Microstructure -- Mechanical properties; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.03.051
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Starting from ZrO2 and boron (molar ratio: 1:4), four ZrB2 powders were synthesized by borothermal reduction method, three of which were designed to introduce minor modifications by combining solid solution with Ti and/or water-washing. The sinterability, microstructures, mechanical properties and thermal conductivity were investigated. In comparison with the conventional borothermal reduction, the modified methods offered significant improvement in terms of densification of ZrB2 ceramics, particularly the mixture that included water-washing. Owing to the refined particle size and boron residues, ZrB2 ceramics from the modified borothermal reduction which included water-washing demonstrated nearly full densification, Vickers hardness of 14.0 GPa and thermal conductivity of 82.5 W/m K after spark plasma sintering at 2000 °C for 10 min. It was revealed that the properties of ZrB2 ceramics could be enhanced utilizing the proposed minor modification, starting from the same raw materials and adopting the same sintering conditions.