Preparation of low-permittivity K 2 O–B 2 O 3 –SiO 2 –Al 2 O 3 composites without the addition of glass

Nanotechnology Reviews

article

Yong Shang¹  Chaowei Zhong¹  Ruonan Jia²  Huajing Xiong³  Hao Li⁴  Xinyuan Li¹  Xian Jian³ 

[1] State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China;College of Chemistry, University of Chinese Academy of Sciences;School of Materials and Energy, National Engineering Research Center of Electromagnetic Radiation Control Materials, Center for Applied Chemistry, University of Electronic Science and Technology of China;College of Electrical and Information Engineering, Hunan University

关键词: Low permittivity;    Low loss;    High flexural strength;    LTCC applications;   

DOI  :  10.1515/ntrev-2019-0041

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

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 K 2 O– B 2 O 3 –SiO 2 –Al 2 O 3 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 tan δ 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.

【 授权许可】

CC BY