Microstructure and properties of functional magnesium titanate ceramic joint brazed by bismuth-borate glass. Issue 15 (December 2019)

• Record Type: Journal Article
• Authors: Jiang, Chonglai; Lin, Panpan; Chen, Qianqian; Wang, Ce; Lin, Tiesong; He, Peng; Zhao, Xuan; Xu, Jiujie; Liu, Yan; Liu, Hongzhi; Long, Weimin; Zheng, Yi
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 15(2019)
• Page Start: 4901
• Page End: 4910
• Publication Date: 2019-12
• Subjects: Magnesium titanate ceramic -- Bismuth-Borate glass braze -- Interfacial reaction -- Shear strength -- Dielectric 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.2019.07.005
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Bismuth-borate glass braze (Bi25) with low melting point was utilized to braze magnesium titanate ceramic (MTC) in this work. The interfacial reaction between MTC and bismuth-borate glass braze made a well brazing possible. First, the Zn atoms from the glass seam substituted Mg atoms from MTC forming the phase (Zn, Mg)2 TiO4 of lamellar morphology, which reacted with [BiO6 ] (or [BiO3 ]) from glass seam and then generated Bi4 Ti3 O12 of granular and sheet-like morphologies. The Mg 2+ deriving from the reactions above reacted with [SiO4 ] unit from glass seam and generated Mg(SiO3 ) of granular and stripe-like morphologies. The shear strength increased first and then decreased with the increase of brazing temperature constantly. It reached a maximum value of 72 MPa at 725 °C. The dielectric loss tangent of joints always tended to zero at high frequency, and the dielectric constant of joints brazed at 750 °C was closest to that of base MTC itself.