Circuits Assembly - July 2008 - (Page 75) 创新硅胶材料提供在恶劣环 境中的稳定性 对仪器控制板的连接及分离，对线缆的接插 及 拔 断 ， 汽 车 用电子模块及建筑用机械设备所 经历的持续振动。所有上述情况都会造成对 电 子 器 件 的 严 重损害，导致使用性能的显著下 降，或是操作功能的完全丧失。在极端恶劣 环 境 下 ， 为 了 克服引脚弯曲，元器件受震动损 伤 ， 以 及 材 料 性能退化，通常需要额外的稳定 性 来 提 高 可 靠 性。然而，能提供此额外稳定性 的 材 料 通 常 还 面临其他苛刻的要求，比如快速 的 固 化 ， 与 生 产线流程一体化的结合，简便的 使用以及完美的外观。 传统的应用中，使用热熔胶来获得所需要的 稳 定 性 和 保 护 性。虽然这些材料可能提供一定 的 应 力 缓 释 ， 但其使用非常困难。在大多数情 况 下 ， 热 熔 胶 必须手动施胶。同时，热熔胶在 生 产 环 境 中 非 常肮脏，并且会造成安全隐患， 因为在热熔胶的应用中普遍地使用燃烧或加 热 。 从 使 用 性 能的角度，热熔胶同样存在许多 难 点 。 由 于 热 熔胶的点胶比较困难，因此点胶 位 置 不 能 被 控 制得非常精准。另外，热熔胶的 离 子 含 量 相 对 比较高，会导致腐蚀的问题，最 终 造 成 产 品 失 效。再者，由于绝大多数的热熔 胶 属 于 热 塑 性 ，而非热固性，当用于高温环境 下 时 ， 比 如 汽 车电子的应用，热熔胶有可能熔 化 ， 造 成 流 失 或者强度显著减弱，从而对性能 表现产生负面的影响。 针对当今许多高要求的应用，新硅胶技术得 以 研 发 ， 做 为 一种经济并可靠的方式，用于提 供 额 外 加 固 及 减震。这种新类型的材料是一种 无腐蚀的室温硫化（RTV）硅胶材料，能够非常 快 速 的 固 化 ， 可应用于非常广泛的领域，包括 跳 线 固 定 ， 选 择性密封，防振动应力吸收以及 印刷线路板(PCB)的可维修应用。由于具备了非 常快速的点胶性能，例如只需31秒就能完成两 个连接器件的点胶，同时表干时间少于5分钟， 新 一 代 的 硅 胶 技术能够替代其它材料成为高产 能制造业的选择。大部份硅胶具有高触变性， 因此在点胶后硅胶能够很好地保持胶点形状， 不会坍塌扩散或是转移到其它有质量风险的位 置。硅胶体系能够在室温下完成固化，因此不 需要投资额外的固化设备就能用于一般的生产 环境中。 该新型硅胶材料还有其它的优点。剪切强度 非常出色，能够有效防护元器件或线路板所受 到的拉力。同时具备显著的高粘附力，使之能 够在许多不同材质上形成高强度和持久性的粘 结点。并且该材料的耐高温特性非常出众。与 热熔胶或是早期硅胶不同，该新型硅胶的应用 窗口非常宽，是适用于高温工作环境（比如汽 车电子模块的应用）的理想选择。即使在最严 酷的环境下，该硅胶也能有效地保持强度，形 状，颜色等特性。此外，与热熔胶相比，硅胶 体系所特有的柔韧性和弹性使之更适用于电子 元器件的支撑补强应用。从胶点外观形状的角 度看，该新型的硅胶配方同样比其它竞争产品 更出色。与其它硅胶材料固化后发黄变暗的颜 色相比，该产品固化后清澈透明，更加美观。 n Materials World Dr. Renzhe Zhao is technical manager, applications engineering at the electronics group of Henkel (henkel.com); renzhe. zhao@us.henkel.com. For the English version, visit circuits assembly.com. Figure 1. 新一代的硅胶材料提供出色的可靠性能和 外观美感 circuitsassembly.com Circuits Assembly JULY 2008 75 http://henkel.com http://assembly.com http://circuitsassembly.com
Table of Contents Feed for the Digital Edition of Circuits Assembly - July 2008 Circuits Assembly - July 2008 Contents Caveat Lector Industry News Market Watch Talking Heads Focus on Business Global Sourcing On the Forefront Screen Printing Tech Tips Will Electronics Follow the Sun? ‘Warm’ Manufacturing Heats Up Reputation Trumps Recession, China ‘Web Circuits’ A Novel Non-VOC Conformal Coating Krypton: Benchmarking Customer Satisfaction 2008-09 CIRCUITS ASSEMBLY Buyers Guide Wave Soldering Pb-Free Lessons Learned Process Doctor Materials World SMTA Int'l Product Preview Ad Index Assembly Insider Technical Abstracts Circuits Assembly - July 2008 Circuits Assembly - July 2008 - Circuits Assembly - July 2008 (Page Cover1) Circuits Assembly - July 2008 - Circuits Assembly - July 2008 (Page Cover2) Circuits Assembly - July 2008 - Circuits Assembly - July 2008 (Page 1) Circuits Assembly - July 2008 - Circuits Assembly - July 2008 (Page 2) Circuits Assembly - July 2008 - Contents (Page 3) Circuits Assembly - July 2008 - Contents (Page 4) Circuits Assembly - July 2008 - Contents (Page 5) Circuits Assembly - July 2008 - Caveat Lector (Page 6) Circuits Assembly - July 2008 - Caveat Lector (Page 7) Circuits Assembly - July 2008 - Industry News (Page 8) Circuits Assembly - July 2008 - Industry News (Page 9) Circuits Assembly - July 2008 - Industry News (Page 10) Circuits Assembly - July 2008 - Industry News (Page 11) Circuits Assembly - July 2008 - Industry News (Page 12) Circuits Assembly - July 2008 - Industry News (Page 13) Circuits Assembly - July 2008 - Industry News (Page 14) Circuits Assembly - July 2008 - Industry News (Page 15) Circuits Assembly - July 2008 - Industry News (Page 16) Circuits Assembly - July 2008 - Industry News (Page 17) Circuits Assembly - July 2008 - Market Watch (Page 18) Circuits Assembly - July 2008 - Talking Heads (Page 19) Circuits Assembly - July 2008 - Talking Heads (Page 20) Circuits Assembly - July 2008 - Focus on Business (Page 21) Circuits Assembly - July 2008 - Global Sourcing (Page 22) Circuits Assembly - July 2008 - Global Sourcing (Page 23) Circuits Assembly - July 2008 - On the Forefront (Page 24) Circuits Assembly - July 2008 - Screen Printing (Page 25) Circuits Assembly - July 2008 - Tech Tips (Page 26) Circuits Assembly - July 2008 - Will Electronics Follow the Sun? (Page 27) Circuits Assembly - July 2008 - Will Electronics Follow the Sun? (Page 28) Circuits Assembly - July 2008 - Will Electronics Follow the Sun? (Page 29) Circuits Assembly - July 2008 - ‘Warm’ Manufacturing Heats Up (Page 30) Circuits Assembly - July 2008 - ‘Warm’ Manufacturing Heats Up (Page 31) Circuits Assembly - July 2008 - ‘Warm’ Manufacturing Heats Up (Page 32) Circuits Assembly - July 2008 - ‘Warm’ Manufacturing Heats Up (Page 33) Circuits Assembly - July 2008 - ‘Warm’ Manufacturing Heats Up (Page 34) Circuits Assembly - July 2008 - ‘Warm’ Manufacturing Heats Up (Page 35) Circuits Assembly - July 2008 - Reputation Trumps Recession, China (Page 36) Circuits Assembly - July 2008 - Reputation Trumps Recession, China (Page 37) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 38) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 39) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 40) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 41) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 42) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 43) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 44) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 45) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 46) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 47) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 48) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 49) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 50) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 51) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 52) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 53) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 54) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 55) Circuits Assembly - July 2008 - ‘Web Circuits’ (Page 56) Circuits Assembly - July 2008 - A Novel Non-VOC Conformal Coating (Page 57) Circuits Assembly - July 2008 - A Novel Non-VOC Conformal Coating (Page 58) Circuits Assembly - July 2008 - A Novel Non-VOC Conformal Coating (Page 59) Circuits Assembly - July 2008 - A Novel Non-VOC Conformal Coating (Page 60) Circuits Assembly - July 2008 - Krypton: Benchmarking Customer Satisfaction (Page 61) Circuits Assembly - July 2008 - Krypton: Benchmarking Customer Satisfaction (Page 62) Circuits Assembly - July 2008 - Krypton: Benchmarking Customer Satisfaction (Page 63) Circuits Assembly - July 2008 - 2008-09 CIRCUITS ASSEMBLY Buyers Guide (Page 64) Circuits Assembly - July 2008 - 2008-09 CIRCUITS ASSEMBLY Buyers Guide (Page 65) Circuits Assembly - July 2008 - 2008-09 CIRCUITS ASSEMBLY Buyers Guide (Page 66) Circuits Assembly - July 2008 - 2008-09 CIRCUITS ASSEMBLY Buyers Guide (Page 67) Circuits Assembly - July 2008 - 2008-09 CIRCUITS ASSEMBLY Buyers Guide (Page 68) Circuits Assembly - July 2008 - 2008-09 CIRCUITS ASSEMBLY Buyers Guide (Page 69) Circuits Assembly - July 2008 - 2008-09 CIRCUITS ASSEMBLY Buyers Guide (Page 70) Circuits Assembly - July 2008 - Wave Soldering (Page 71) Circuits Assembly - July 2008 - Pb-Free Lessons Learned (Page 72) Circuits Assembly - July 2008 - Pb-Free Lessons Learned (Page 73) Circuits Assembly - July 2008 - Process Doctor (Page 74) Circuits Assembly - July 2008 - Materials World (Page 75) Circuits Assembly - July 2008 - SMTA Int'l Product Preview (Page 76) Circuits Assembly - July 2008 - SMTA Int'l Product Preview (Page 77) Circuits Assembly - July 2008 - Ad Index (Page 78) Circuits Assembly - July 2008 - Assembly Insider (Page 79) Circuits Assembly - July 2008 - Technical Abstracts (Page 80) Circuits Assembly - July 2008 - Technical Abstracts (Page Cover3) Circuits Assembly - July 2008 - Technical Abstracts (Page Cover4)
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