Facile Synthesis of “Quench‐Free Glass” and Ceramic‐Glass Composite for LTCC Applications

Abstract

The 10 mol% ZnO-2 mol% B 2 O 3 -8 mol% P 2 O 5 -80 mol% TeO 2 (ZBPT) glass was prepared by quenching as well as slowly cooling the melt. The ZBPT glass prepared by both methods show similar microwave dielectric properties. ZBPT glass has an e r of 22.5 (at 7 GHz), Q u 3 f of 1500 GHz, and τ f of À100 ppm/°C. The ceramic-glass composites of Sr 2 ZnTeO 6 (SZT) and ZBPT is prepared through two convenient methods: (a) conventional way of co-firing the ceramic with ZBPT glass powder and (b) a nonconventional facile route by co-firing the ceramic with precursor oxide mixture of ZBPT glass at 950°C. In the former route, SZT + 5 wt% ZBPT composite sintered at 950°C showed moderately good microwave dielectric properties (e r = 13.4, Q u 3 f = 4500 GHz and τ f = À52 ppm/°C). Although the SZT + 5 wt% ZBPT composite prepared through the nonconventional method also showed similar microwave dielectric properties (e r = 13.8, Q u 3 f = 5300 GHz and τ f = À50 ppm/°C), the synthesis procedure is much simplified in the latter case. The composites are found to be chemically compatible with Ag. The composite containing 5 wt% ZBPT prepared through conventional and nonconventional ways shows linear coefficients of thermal expansion of 7.0 ppm/°C and 7.1 ppm/°C, respectively. Both the composites have a room-temperature thermal conductivity of 2.1 Wm À1 K À1.

Overview on low temperature co-fired ceramic sensors

“…The properties of fired ceramics are mainly designed on a slurry preparation stage. It is worth of noticed that tapes with significantly different properties can be fabricated using tape casting technique [35][36][37][38][39]. …”

Microwave dielectric characterization and densification mechanism analysis of CaO‐B2O3‐SiO2 glass–ceramic/Al2O3 composites for LTCC applications

“…However, as an introduced impurity, the glass may increase the number of pores in the sintered body and affect the unique dielectric, thermal, and mechanical properties of ceramics. 8,9 Qualified LTCC materials should meet the requirements of a low dielectric constant (ε r ), low dielectric loss (tan δ), high thermal conductivity, low coefficient of thermal expansion (CTE), and structural densification. 10 LTCC is mainly used in the fields of electronic packaging and microwave communication devices.…”

Ferroelectric Glass-Ceramic Systems for Energy Storage Applications

“…Some newer applications, such as in low temperature co-fired ceramics (LTCCs) and dynamic random access memories (DRAMs), utilise the material's dielectric properties. LTCC applications require the sintering temperature to be below the melting point of the electrode materials [2]. The chemical processes of adding glass and using starting materials with ultra-fine particle sizes improve the characteristics of ceramics at low sintering temperatures [3].…”