Influence of B4C on oxidation resistance of PSN/borosilicate glass-B4C field-based repair coating of C/C aircraft brake materials at 700–900 °C. Issue 16 (November 2019)

• Record Type: Journal Article
• Authors: Deng, Juanli; Hu, Kaiyue; Lu, Baofu; Zheng, Bohan; Fan, Shangwu; Zhang, Litong; Cheng, Laifei
• Is Part Of: Ceramics international. Volume 45:Issue 16(2019)
• Page Start: 20860
• Page End: 20872
• Publication Date: 2019-11
• Subjects: Borosilicate glass -- B4C -- Antioxidation -- Self-healing -- Repair coating; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.07.075
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: PSN/borosilicate glass-B4 C coating was designed for use as field-based repair coating on carbon/carbon (C/C) composites for aircraft brakes. The first PSN layer was transition layer that improved wettability between glass coating and C/C, and the second layer of borosilicate glass-B4 C formed outer glass layer. Effect of B4 C content on oxidation behavior of C/C repair coating was investigated. The coating with 25 wt% B4 C demonstrated excellent oxidation resistance and could effectively protect C/C composites from oxidation. Weight losses of −3.1% at 700 °C and −2.9% at 900 °C were observed after being oxidized for 10 h. Repair coating with smooth, dense, and crack-free structure could be rapidly formed as B4 C content of the coating increased to 25 wt% and 35 wt% with increasing oxidation time. B4 C in repair coating could be oxidized into B2 O3 glass and it could heal defects in the coating. Residual B4 C dispersed in the coating could dispersion strengthen glass coating and inhibit crack formation in the coating.