9 research outputs found
Cold Sintering Na<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> Ceramic with Poly(ether imide) (PEI) Polymer to Realize High-Performance Composites and Integrated Multilayer Circuits
The
cold-sintering process is utilized to fabricate ceramic–polymer
(Na<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub>-polyÂ(ether imide), PEI)
composites and integrated multilayer circuits. The Na<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub>-PEI bulk composites cold-sintered at 120 °C
show high densities (>90% theoretical). The permittivity at microwave
frequencies decreases with increasing PEI content, following the classical
logarithmic mixing law, and <i>Qf</i> values show no deterioration
with the addition of PEI. Furthermore, the characteristic dielectric
breakdown strength of the ceramic–polymer composite obtained
from a Weibull plot increases dramatically from 55.1 to 107.5 MV/m
with 10–20 vol % PEI additions. In the case of high PEI content
where there is more segregation of the polymer within the ceramic
matrix, there is a gradual decrease in the dielectric breakdown strength.
Na<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub>-PEI-Ag bulk ring resonators
can be obtained by post screen printing, and the mixing laws are used
to calculate the permittivity of the ring resonators. As a prototype
of integrated multilayer circuits, Na<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub>-PEI-Ag multilayer ring resonators with good microwave dielectric
properties can be successfully densified by cold-sintered cofired
ceramic-composite technology at 120 °C without delamination or
warping, demonstrating the feasibility of cold sintering in the ceramic–polymer
composite integrated multilayer circuits