目的 提高MLCC陶瓷薄膜涂布中微凹吻涂工艺的厚度精度与均匀性,研究微凹吻涂中刮墨刀几何参数对涂层质量的影响规律。方法 选取合适的边界条件,简化二维纳维-斯托克斯方程,得出浆料在刮墨刀、微凹辊间隙内流动的雷诺方程,推导出刮墨刀几何参数与涂层厚度的几何关系式。采用Matlab平台,基于流体动力学、接触力学及传质理论,对浆料在刮墨刀、微凹辊间隙内的流动过程开展CFD流固耦合仿真试验。结果 结果表明,仿真结果与理论定厚公式吻合度较高,仿真发现,刮墨刀类型、刮墨刀与微凹辊接触的最小间隙和角度共同影响涂层质量,逗号刮墨刀在参数组合为Smin=5 μm、R=30 mm、k=10 mm时,可实现最佳的涂层均匀性,而斜角刮墨刀在Lmin=5 μm、β=0°时可实现最薄的涂层厚度。结论 对于斜角刮墨刀,增大β与Lmin有助于改善涂层均匀性,但会导致涂层增厚;对于逗号刮墨刀,增大最小间隙会增加涂层厚度,增大最小间隙与刮墨刀半径会提升均匀性,而增大k则会使均匀性下降。本研究为MLCC高性能薄膜涂布工艺中刮墨刀选型与参数选择提供了技术参考。
Abstract
To improve the thickness accuracy and uniformity of the micro-gravure coating process in MLCC ceramic film fabrication, the work aims to investigate the effect of doctor blade geometric parameters on coating quality. Appropriate boundary conditions were selected to simplify the two-dimensional Navier-Stokes equation, deriving the Reynolds equation for the slurry flow in the gap between the doctor blade and the micro-gravure roller. A geometric relationship between doctor blade parameters and coating thickness was established. With the Matlab platform and based on hydrodynamic, contact mechanical, and mass transfer theories, a CFD fluid-structure interaction simulation was conducted to analyze the flow behavior of the slurry in the blade-roller gap. The simulation results showed good agreement with the theoretical thickness model. It was found that the type of doctor blade, the minimum blade-roller gap, and the blade angle collectively affected coating quality. The comma doctor blade achieved optimal coating uniformity with the parameter combination of Smin=5 μm, R=30 mm, k=10 mm, while the beveled doctor blade attained the minimum coating thickness at Lmin=5 μm and β=0°. For the beveled doctor blade, increasing β and Lmin helps improve coating uniformity, but results in a thicker coating. For the comma doctor blade, increasing the minimum gap leads to an increase in coating thickness, increasing the minimum gap and the blade radius enhances coating uniformity, whereas increasing k causes a decline in uniformity. This study provides a technical reference for doctor blade selection and parameter optimization in high-performance film coating processes for MLCC.
关键词
MLCC /
流体动力学 /
涂层厚度 /
Matlab
Key words
MLCC /
fluid mechanics /
coating thickness /
Matlab
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基金
北京印刷学院校级项目（KYCPT202513）; 北京市属高等学校高水平科研创新团队建设支持计划（BPHR20220107）; 国家自然科学基金（62403065）
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