Abstract
Kaolin clay is an inexpensive and abundant material with potential for use as a low-dielectric-constant ceramic; however, the natural metallic oxides the clay contains hinder such applications. In this study, kaolin clay ceramics with excellent physical and dielectric properties were synthesized using kaolin clay as the raw material by chemical cleaning and sintering. Characterization of the resulting samples showed that the sulfuric acid treatment has a significant influence on the metallic oxide content and dielectric properties of the kaolin clay ceramics. When the kaolin clay raw material was treated with sulfuric acid three times, the dielectric constant decreased from 5.12 to 3.75 and the Vickers hardness increased from 946 to 1,214 kg/mm2 relative to the ceramic prepared from the untreated clay. Therefore, these ceramics exhibit significant potential for use in the microelectronics industry.
Highlights
In recent years, low-dielectric-constant materials have been commonly employed in microwave devices, ultra-large-scale integrated circuits, and other applications (Sato et al, 2013; Hong et al, 2020)
We explored the properties of the resulting kaolin clay ceramics depending on how many sulfuric acid treatment cycles were applied
Kaolin clay was obtained from the Hunan Province of China, treated with sulfuric acid (2 M), and made into ceramics
Summary
Low-dielectric-constant materials have been commonly employed in microwave devices, ultra-large-scale integrated circuits, and other applications (Sato et al, 2013; Hong et al, 2020). The kaolin clay itself as a raw material contains metallic oxides such as Fe2O3 and CaO, which deteriorate the dielectric properties of the resulting ceramics (Yu et al, 2016). Kaolin clay was used as raw material to prepare low-dielectric-constant kaolin clay ceramics by chemical cleaning and sintering. Many of the metallic elements in the raw kaolin clay, Preparation of Kaolin Clay Ceramics Such as Ca, Fe, V, Rb, and Mn, were dissolved in sulfuric acid and washed away by distilled water. The raw kaolin clay was ground into a powder and added to a sulfuric acid solution (2 M) to form a suspension, which was maintained under stirring for 30 min at room temperature to dissolve metallic oxides such as CaO and Fe2O3. C·h εo · S where C is the capacitance, h is the distance between the two electrodes, εo is the vacuum permittivity (Ɛo 1/4π·9·1011 F/cm), and S is the area of the two electrodes
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