一种直流偏压特性X7R陶瓷介质材料及其制备方法
By preparing core-shell barium titanate powder using an in-situ hydrothermal method and employing a segmented atmosphere sintering process, the stability and uniformity issues of X7R ceramic dielectric materials under DC bias were resolved. This resulted in high performance stability and low dielectric loss over a wide temperature range, meeting the application requirements of high-end MLCCs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HANGZHOU XINGRONG TECH CO LTD
- Filing Date
- 2026-05-18
- Publication Date
- 2026-07-17
AI Technical Summary
Existing X7R ceramic dielectric materials suffer from insufficient wide-temperature dielectric stability under DC bias, poor grain uniformity, and unclear core-shell structure, failing to meet the stringent performance requirements of high-end MLCCs.
Uniform core-shell barium titanate powder was prepared by in-situ hydrothermal method. A multi-component synergistic doping system and segmented atmosphere sintering process were adopted to achieve comprehensive optimization of DC bias stability, wide temperature capacitance variation, dielectric loss and sintering activity.
It achieves a capacity change rate of ≤±11% over a wide temperature range of -55℃ to 125℃, a stable dielectric constant of 2400~2600, a dielectric loss of ≤0.012, no temperature drift abrupt changes, and a capacity decay rate of less than 9% under DC bias, meeting the stringent application requirements of high-end MLCCs.
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Figure CN122187484B_ABST