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)2TiO4 of lamellar morphology, which reacted with [BiO6] (or [BiO3]) from glass seam and then generated Bi4Ti3O12 of granular and sheet-like morphologies. The Mg2+ 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.
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