Transparent YAG ceramic/sapphire composite fabricated by pressureless direct thermal diffusion bonding. Issue 15 (December 2021)

• Record Type: Journal Article
• Authors: Feng, Zhe; Ma, Chaoyang; Hu, Sigui; Zhang, Chunguang; Niu, Yude; Wen, Zicheng; Guo, Wang; Yuan, Xuanyi; Cao, Yongge
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 15(2021)
• Page Start: 7845
• Page End: 7851
• Publication Date: 2021-12
• Subjects: Diffusion bonding -- YAG ceramic/sapphire -- Composite laser media -- IR transmittance spectra; 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.2021.08.020
• Languages: English
• ISSNs: 0955-2219

Abstract

Highlights: Transparent YAG ceramic/c-plane sapphire composites were fabricated by pressureless direct thermal diffusion bonding method. Diffusion lengths for Nd, Yb and Y ions across the well-defined bonding interfaces were calculated about 0.5 μm by Fick's second diffusion law. Around the bonding interfaces, neither crystallization of YAG ceramic nor ceramization of sapphire were observed. Growth of YAG grains and variation of sapphire growth striation under heating induced the instability or even crack of the bonding composite. Abstract: Transparent YAG ceramic/c-plane sapphire composites were successfully fabricated by pressureless direct thermal diffusion bonding at 1650 ℃ for 10 h in a vacuum. The bonding interfaces could be well defined between YAG ceramic and sapphire, and effective diffusion lengths from YAG to sapphire were calculated to be about 0.5 μm for Nd, Yb and Y ions by Fick's second diffusion law. Around the bonding interface, neither crystallization of YAG ceramic nor ceramization of sapphire were observed, and besides, growth of YAG grains as well as variation of sapphire growth striation under heating probably induced the instability or even crack of the composite. In addition, precisely parallel polished contact surfaces of ceramic and sapphire are required for enhancing bonding strength. This work presented a clear vision for the bonding interfaces of YAG ceramic/sapphire composite, and will pave the way for robust and efficient composite laser media.