» 用于电子产品保护的保形涂层

用于电子产品保护的保形涂层

1960
技术人员在无尘室中为印刷电路板涂敷保形涂料。

(generate image for illustration only)

A conformal 涂层 is a thin, protective polymeric film applied to a printed circuit board (PCB) that ‘conforms’ to the contours of the board and its components. Its primary purpose is to protect the electronic circuits from harsh environmental conditions such as moisture, dust, chemicals, and extreme temperatures, thereby increasing the reliability and 寿命 of the device.

Conformal coatings are typically 25-250 micrometers thick and function as a dielectric barrier, preventing short circuits, corrosion, and dendrite growth caused by environmental contaminants. There are several types of conformal coatings, each with distinct properties. Acrylics are easy to apply and remove, making them suitable for applications requiring rework. Urethanes offer excellent chemical resistance and toughness. Silicones provide superior performance over a wide temperature range and are very flexible, which helps mitigate thermal stress. Epoxies are extremely hard and provide outstanding resistance to moisture and chemicals but are very difficult to remove. A more recent type, Parylene, is applied via a chemical vapor deposition process, resulting in a truly conformal, pinhole-free, and ultra-thin coating with excellent barrier properties. The application method—dipping, spraying, or brushing—is chosen based on the coating type, board complexity, and production volume. While the coating protects the board, areas like connectors, test points, and sockets must be masked or kept free of the coating to maintain electrical connectivity. The choice of coating material and application process is a critical design decision in ensuring the long-term reliability of electronic assemblies.

UNESCO Nomenclature: 3308
- 电子产品

类型

Material Application

中断

递增

使用方法

广泛使用

前体

  • 印刷电路板(PCB)的发明
  • 各种聚合物(丙烯酸、硅酮、聚氨酯)的合成
  • 军事和航空航天应用对高可靠性电子产品的需求
  • 了解电子产品的故障机制,例如腐蚀和电迁移

应用

  • 航空航天和国防电子
  • 汽车控制单元
  • 工业控制系统
  • 医疗器械和植入物
  • 暴露于恶劣环境的消费电子产品(例如船用电子产品)

专利:

NA

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Related to: conformal coating, pcb, electronics, reliability, polymer film, dielectric, moisture protection, acrylic, silicone, parylene.

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历史背景

用于电子产品保护的保形涂层

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(如果日期不详或不相关,例如 "流体力学",则对其显著出现的时间作了四舍五入的估计)。

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