Investigation of zinc borosilicate manganese glass with excellent low-melting properties for multilayer ceramic capacitor conductive copper pastes

With the wide application of multi-layer ceramic capacitors (MLCC), low-melting borosilicate glasses for copper pastes are highly desired. Herein, Zinc borosilicate manganese glasses with the molar composition of (60-x) ZnO–30B2O3–10SiO2-xMnO2 (ZBSM), (x between 0.0 ∼ 20.0 mol%) were designed for MLCC copper paste. The copper terminal paste sintering temperature can reduce to 780°C by increasing the content of MnO2 in ZBSM glass from 0 to 20% mol ratio. The DSC results show the glass transition temperature decreases with the increase of MnO2 content. The entry of Mn4+ as a network modifier to change the network structure. Notably, the ZBSM glass based on copper paste demonstrated remarkable acid tolerance, excellent conductivity of 2.05 mΩ and long-term stability, exhibiting great promise for application in the MLCC industry.