Sintering behavior and microwave performance of CaSiO3 ceramics doped with BaCu(B2O5) for LTCC applications

Abstract

Abstract CaSiO3 (CS) ceramics exhibit excellent microwave performance as a microwave material, however, its sintering temperature is too high and limits its application in the microwave field. In this work, the densification process and microwave performance of the BaCu(B2O5) (BCB) doped CS ceramics were researched. The results showed that the sintering temperature of CS ceramics can be lowered from 1340 °C to 930 °C by BCB additive. In order to obtain ceramic samples with excellent microwave properties and high density, adding 4 wt% BCB to CS ceramics was considered to be optimal. Under this formulation, BCB-CS ceramics sintered at low sintering temperatures (950 °C for 3 h), possessed outstanding microwave performance of e r = 4.7 , Q × f = 34807.5 G H z , τ f = − 21.5 p p m / ° C . Moreover, CS ceramics doped with BCB had a good chemical compatibility with silver powder, which indicated that BCB-CS ceramic was a prospective candidate for low temperature co-fired ceramic (LTCC) applications.