Abstract
Abstract In the field of low temperature co-fired ceramic (LTCC), it remains a challenge to design the performance of LTCC with low permittivity less than 5. Here, the K2O– B2O3–SiO2–Al2O3 composites are prepared without the preparation of prior glass. Meanwhile, the factors of the CaO content on microstructure, phase structure and properties of the composites are considered systematically. The crystal structure measured by X-ray diffraction (XRD) shows that there are quartz and alumina as the crystal phases. The results reveals that the tailoring CaO content benefits sintering densification, low dielectric loss, great mechanical properties and low thermal expansion coefficient. As CaO content increases up to 2.8 wt%, the composites sintered at 850∘C have a dielectric constant of 4.94 and tanδ of 8 × 10−4 at 1 MHz, thermal expansion coefficient (CTE) of 8.5 ppm/∘C, and flexural strength of 150 MPa. As the mass fraction of CaO increases up to 3.2 wt%, the maximum flexural strength of 173MPa is achieved. The above study provides an effective approach for preparing the novel composites as a promising candidate for LTCC applications.
Highlights
In the field of low temperature co-fired ceramic (LTCC), it remains a challenge to design the performance of LTCC with low permittivity less than 5
The results reveals that the tailoring CaO content benefits sintering densification, low dielectric loss, great mechanical properties and low thermal expansion coefficient
As CaO content increases up to 2.8 wt%, the composites sintered at 850∘C have a dielectric constant of 4.94 and tanδ of 8 × 10−4 at 1 MHz, thermal expansion coefficient (CTE) of 8.5 ppm/∘C, and flexural strength of 150 MPa
Summary
Abstract: In the field of low temperature co-fired ceramic (LTCC), it remains a challenge to design the performance of LTCC with low permittivity less than 5. The results reveals that the tailoring CaO content benefits sintering densification, low dielectric loss, great mechanical properties and low thermal expansion coefficient. The above study provides an effective approach for preparing the novel composites as a promising candidate for LTCC applications. Qin Xia et al [9] prepared K2O–B2O3–SiO2–Al2O3 glass ceramics, showing a high dielectric constant of 6.1 and a heavy dielectric loss of 2×10−3 at 1 MHz. Xianfu Luo et al [10] reported the properties of CaO–Al2O3–B2O3–SiO2 glass/Al2O3 composite with different CaO contents. Boron oxide (melting point of 450∘C) evaporates rapidly at high temperature, making it difficult for borosilicate glasses to control their composition. Xueming Cui et al [12] reported an effective pre-sintering method to fabricate BaO–TiO2– B2O3–SiO2 glass–ceramic, which was a simple approach that the whole mixed solid oxides were sintered at 750∘C instead of preparing melting glass over 1000∘C. The effects of CaO content on dielectric properties, thermal expansion coefficient, and flexural strength are presented separately
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