Thermal Sintering Matchability between Low-Temperature Cofired Ceramic Substrate and Silver Pastes and the Effect of CuO on Silver Diffusion Inhibition

Low-temperature cofired ceramic (LTCC) materials are a promising material for heat dissipation substrates due to their excellent thermal conductivity and thermal expansion coefficient similar to that of silicon. However, the difficulties in surface metallization techniques limit its application. This work uses Bi-B-Si-Zn-Al glass/ceramic composite as the substrate and Bi-B-Si-Zn-Al glass powder as the inorganic binder for silver pastes. The silver thick film with a glass content of 3 wt% is sintered at 800 degrees C for 30 min, and the samples have excellent electrical conductivity (surface square resistance of 0.29 m omega -1) pound and mechanical properties (interface bonding force of 17.56 MPa). In addition, the introduction of CuO into the glass phase can inhibit the silver diffusion phenomenon during the sintering process and improve the conductive performance of the material. The results are beneficial for the preparation and application stability of LTCC devices. This work uses Bi-B-Si-Zn-Al glass/ceramic composite as the substrate and Bi-B-Si-Zn-Al glass powder as the inorganic binder for silver pastes. The green sheets prepared have good cofiring compatibility with silver pastes and excellent comprehensive performance. Moreover, the introduction of appropriate CuO into the glass powder has an effect on inhibiting silver diffusion.image (c) 2024 WILEY-VCH GmbH