To make use of metals with improved conductivity like Ag, AgPd, Au or Cu for metallization pastes in ceramic
multilayer technology, Low-Temperature Co-fired Ceramics (LTCC) are densified at temperatures below 900°C. The
densification mechanism can be attributed to viscous sintering in combination with the crystallization of the glass matrix.
Lifetime prediction and extension of the application range to elevated temperatures strongly depend on the transition
range of the remaining amorphous phase as well as on the final crystallization products. Due to the fact that multilayer
ceramics based on LTCCs are gaining increasing interest in the manufacturing of highly integrated devices for
microelectronic and sensor applications, there is the need to establish a better understanding of their mechanical and
electrical behaviour in the elevated temperature regime. In this study, four commercial LTCC substrate materials in
addition to a test product in the sintered state, namely DP 951, DP 943, both from DuPont, CT 800 and AHT-01, both
from Heraeus, and GC from CeramTec were investigated in respect to the temperature dependence of their mechanical
and electrical properties up to temperatures of 950 °C. Mechanical characterization included three-point bending tests on
single layer substrates. Furthermore, the surface resistivity as a function of temperature up to 500°C was determined
under vacuum for DP 951. Next, these results were correlated to the composition of the glasses, determined by
inductively coupled plasma (ICP) analysis, as well as the crystallization products apparent in the composites, which were
determined by XRD of the sintered substrates and in-situ HT-XRD for DP 951. Results gained from these investigations
of the commercial LTCC products were compared to measurements carried out on glass-ceramic composites developed
in-house exhibiting improved electrical behaviour and good temperature stability.
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