Improvement of densification and mechanical properties of Al2O3–B4C ceramics. Issue 9 (July 2016)

• Record Type: Journal Article
• Authors: Guo, Wei-Ming; Zhang, Zhi-Lin; Li, Jing-Xi; You, Yang; Wu, Shang-hua; Lin, Hua-Tay
• Is Part Of: Ceramics international. Volume 42:Issue 9(2016)
• Page Start: 11486
• Page End: 11489
• Publication Date: 2016-07
• Subjects: Al2O3–B4C ceramics -- Al18B4O33 phase -- Densification -- Microstructure -- Mechanical properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.04.025
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Al2 O3 –B4 C ceramics had poor densification, due to the formation of Al18 B4 O33 phase by reaction between Al2 O3 and B2 O3 on the surface of B4 C. In the present work, Y2 O3 or Ti additive together with ZrO2 from milling media were introduced into Al2 O3 –B4 C ceramics. Results showed that Y2 O3 reacted with B2 O3 to produce YBO3 phase, and removed Al18 B4 O33 phase, resulting in the improved densification and the coarse microstructure. However, Ti and ZrO2 reacted with B2 O3 to produce hard TiB2 and ZrB2 phases, removed the most of Al18 B4 O33 phase, refined microstructure by pinning effect of hard particles, and improved densification and mechanical properties.