The co-fired behaviors between Ag and glass–ceramics materials in LTCC

Abstract

The paper studied the interfacial co-fired behavior between silver and Ba-Ti-B-Si-O glass-ceramics composites for LTCC application. The dielectric properties of this LTCC glass-ceramic materials were as follows: ɛ≈ 8-10, tanδ≤2×10 −3 (at 1 GHz), and its sintering temperature was lower than 900°C. The Ag elemental distribution near the interface between glass-ceramics and Ag was investigated by scanning electronic microscopy and energy spectrum analysis. No de-lamination, camber and cracking were found between LTCC/Ag systems after firing at 810-900°C for 2 h. The experimental results showed that the diffusion of silver was mainly decided by sintering temperature and microstructure of LTCC. Promoting densification of the LTCC can prevent Ag diffusion from co-fired interface.

Suppression of Silver Diffusion in Borosilicate Glass‐Based Low‐Temperature Cofired Ceramics by Copper Oxide Addition

“…(a). The yellow color around silver electrode in LTCC1 was related to the silver diffusion . Figure (a) also shows the XPS spectra of the small areas near Ag electrode of both LTCC1 and LTCC2 sintered at 875°C for 30 min.…”

“…Since no atmosphere control is needed during silver cofiring and relatively low cost, silver is a widely used metal electrode in the low‐temperature cofired ceramic (LTCC) components/devices manufacturing . However, due to the mismatched densification kinetics and mechanism between silver and LTCC ceramics, some undesirable phenomena including silver diffusion, delamination, cracks, and camber might occur during cofiring process . Silver diffusion is one of the key issues because it could lead to not only the color stain of the sample appearance but also the increase in leakage current, the decrease in insulation resistance, and eventually affect the electrical properties and reliability of the LTCC modules …”

Low Temperature Sintering and Dielectric Properties of Alumina‐Filled Glass Composites for LTCC Applications

“…The reaction and diffusion of the silver (Ag) electrode can influence the performance, reliability, and microstructure of the components . The XRD pattern and SEM images of the co‐fired samples are shown in Figs.…”

SrZnV2O7: A low‐firing microwave dielectric ceramic with high‐quality factor

“…Recently, low‐temperature co‐fired ceramic (LTCC) technology has gained considerable attention for it can effectively lessen the volume of components, allowing for realizing miniaturization, integration, and modularization of devices. In LTCC, ceramics need to be co‐fired with metal electrodes (e.g., Ag), which requires a low sintering temperature (ST) (<961°C, the melting point of Ag) and chemical compatibility with electrodes 4‐6 …”

“…In LTCC, ceramics need to be co-fired with metal electrodes (e.g., Ag), which requires a low sintering temperature (ST) (<961°C, the melting point of Ag) and chemical compatibility with electrodes. [4][5][6] There are numerous ceramic systems developed with desirable properties, such as MgO-…”