MLCC Ceramic Protection Section Composition for High-Speed Firing

The patent applies local quality by using different ceramic materials with distinct compositions in different regions of the device. The internal electrode layers use a composition optimized for continuity at high heating rates, while the ceramic protection section uses a perovskite-based composition (BaTiO3 with Zr and Nb additions) specifically designed to achieve sufficient sintering and mechanical hardness under the same high heating rate conditions. This spatial differentiation of material properties resolves the contradiction between electrode continuity and protection section hardness.

The patent employs parameter changes by modifying the chemical composition parameters of the ceramic protection section. Specifically, it uses a perovskite structure with Ba at the A-site and Ti, Zr, and Nb at the B-site, with controlled ratios (Zr: 0.01-0.5 mol ratio relative to Ti, Nb: 0.01-0.5 mol ratio relative to Ti). These compositional parameter adjustments enable the protection section to achieve adequate sintering and mechanical properties even when subjected to high temperature increasing speeds that would otherwise result in insufficient sintering.

The patent resolves this contradiction through local quality by assigning different thermal response characteristics to different parts of the device. The ceramic protection section is formulated with perovskite-based materials that have higher sintering activation energy and require higher temperatures for adequate densification, while the internal electrode layers use compositions that are less sensitive to temperature variations. This allows the protection section to achieve necessary hardness only when subjected to high firing temperatures, while the electrode layers maintain their structural integrity without excessive sintering even at these elevated temperatures.

The patent uses parameter changes by establishing specific compositional parameters for the ceramic protection section that create a higher sintering temperature threshold. The perovskite structure with BaTiO3 as the base and controlled additions of Zr (0.01-0.5 mol ratio) and Nb (0.01-0.5 mol ratio) creates a material system with enhanced thermal stability and higher sintering temperature requirements. This parameter optimization ensures that sufficient mechanical hardness is achieved only under high-temperature firing conditions, preventing excessive sintering of other components.

The patent resolves this contradiction through parameter changes by formulating the ceramic protection section with a perovskite-based composition (BaTiO3 with Zr and Nb additions) that has enhanced sintering characteristics. The specific compositional parameters (Zr: 0.01-0.5 mol ratio relative to Ti, Nb: 0.01-0.5 mol ratio relative to Ti) create a material system that achieves adequate densification and mechanical hardness even under rapid heating conditions. This ensures that the protection section maintains its electrical insulation properties and prevents shorts, while still allowing high-temperature increasing speeds to be used for improved productivity.

The patent applies composite materials by creating a multi-component perovskite system that combines BaTiO3 with Zr and Nb additions. This composite ceramic composition leverages the synergistic effects of different elements: BaTiO3 provides the base perovskite structure, Zr enhances sintering behavior and mechanical properties, and Nb contributes to electrical insulation and structural stability. The resulting composite material achieves the necessary reliability for electrical insulation under high-speed firing conditions that would be insufficient for conventional ceramic compositions.