IPC CH-65B CHINESE.pdf - 第90页

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28. Mackie, A. (2009). Electromigration: Our mutual friend. SMTA Wafer Level Packaging Conference.
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8 组装残留物/清洗的考虑要素
8.1 范围 助焊剂料合组成的组装材料,可据元器件的装、、组装类型
元器的不考虑焊接和清洗时,组装残留物取决于焊接方法选择和有
铅或者无铅焊料的使用。选择适合于焊接方法料的助焊剂
确定使用何清洗方法
的清洁取决使环境,在情况规定量要求
电子组装制程的范围单到复杂,并及到广范围的材料。制程中的步骤中所
使用的材料都会对组件有影大的影响是化学物质残留在组件表面。考虑的材料包
助焊剂、清洗溶液、标掩蔽材料、元器残留物残留物。本章节涵盖
数生产制程中
许多普使用的材料。
8.2 ⽬的 本章节的目的讨论在印制电路板生产期间及在组装制程期间残留物
过焊接清洗时。之外讨论了关残留物检测残留物原因
防措施
8.3 术语和定义
8.3.1 性助焊剂: 种酸无机、有机或者水溶性有机助焊剂溶液
8.3.2 活性松⾹助焊剂: 量的有物或者
8.3.3 活化剂: 助焊剂
焊接表面表面能力的物质
8.3.4 合剂: 物体固连或接物质。在表面装中,环氧粘
表面元器粘附板上。
8.3.5 吸附污染物: 或者粘附在材料表面的污染
8.3.6 导体中心距离
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8.3.7 间距 在一个上,的相的可距离(不中心到中心的
距离
8.3.8 敷形涂覆: 绝缘保护涂覆,其涂覆的物体印制板、印制板组件)一
,可提保护环境件的有
8.3.9 腐蚀性助焊剂: 含有一量的或者酸等腐蚀助焊剂
8.3.10 从单板表⾯元器⾯的离: 元器
面到单板表面的距离或者
8.3.11 熔融料表面成的及其污染
8.3.12 助焊剂: 化学和物理活时能表面和其表面
焊接表面在焊接过程中化,熔融料对金属材的润湿
8.3.13 助焊剂残留物: 出现在焊接表面或者,与助焊剂有关的污染
8.3.14 ⽆引线表⾯元器件: 种如
QF或者芯片电容的表面元器件,其
由金属成,金属是元器件本的主要部清洗关元器
无引线元器件下的是非狭窄的。
8.3.15 ⾮活性助焊剂: 不含或者合成助焊剂
8.3.16 有机助焊剂: 主要材料而不或者树组成的助焊剂
8.3.17 装密 单位
元器件(元器件、件,机械)的相对量。
8.3.18 膏状助焊剂: 为了便于使用而制成状形助焊剂
8.3.19 温度 焊接过程中使焊状态时的范围。
8.3.20 树脂 或者合成的材料。
8.3.21 树脂助焊剂: 含有量有机活的有机溶剂
8.3.22 松⾹ 中提的一硬质脂酸酸以
们的构体
些脂组成。
8.3.23 松⾹助焊剂: 机溶剂中的松或者具
8.3.24 焊料球: 附着于层压板、阻焊剂或者导体表面的小球形焊料。
8.3.25 暂时 涂覆到选定材料,后续焊接积到这些
8.3.26 解能⼒ 使用一性和非极溶剂物去污染无机污染的能力。
8.3.27
反应物: 种改善清洗能力的物质,能使印制线路板上的助焊剂残留物化。
8.3.28 托⾼ 单板表面到元器面的距离
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