PCB工艺

SPRAYLATCORPORATION美国普锐公司上海代表处主要技术指标厚度电性能屏蔽性能老化循环测试性能附着性/密着性加工工艺介绍以下测试数据基于普锐公司最新一代导电涂料SOS(表面安全型)系列同时包括有真空电镀的比较数据新一代的导电涂料的性能已经超越了前期的导电涂料SpraylatSOS系列涂料三种类型的金属介质可供选择混合类/599-B3740(银镀铜+纯银)银镀铜/599-B3755纯银/599-B3730ConductivePaintUsesforElectronicApplications…..l电磁波/无线电波屏蔽l环境屏蔽l区间屏蔽lESD保护l接地、共通接地l具有SAR性能涂层厚度膜厚传统的蒸发铝技术每个ChamberFiring能镀上铝层估计3~4.5微米的厚度对于电子产品的应用过程中一般需要1~2次的Firings膜厚SOS导电涂料最新的银漆技术5~7.5微米铜银混合技术7.5~12.5微米铜漆技术12.5~25微米早期的导电涂料银漆12.5~25微米铜银混合涂料17.5~30微米铜漆50~75微米膜厚051015202530354045505560657075VacuumAluminumCopperPaintHybridPaintSilverPaintTypicalRangeOneChamberFiringEarlierPaints膜厚目前的SOS导电涂料的膜厚较早期的导电涂料降低2-4倍膜厚的选择取决于：塑胶底材的表面几何形状所用涂料的种类使用导电涂料的目的导电性能面电阻测试(OhmsperSquare)milliohmspersquare0510152025VacuumAlB3755CopperB3740HybridB3730Silver2-3m/5-7m/10-15m/10-15m/m/�电性能(ohmspersquare)00.020.040.060.080.10.120.140.160.180.20.61.252.551012.517.52537.5Thickness,micronsResistivityohms/sq.599-B3755M599-B3740599-B3730电性能(ohmspersquare)00.020.040.060.080.10.120.140.160.180.20.61.252.551012.517.52537.5Thickness,micronsResistivityohms/sq.B3755B3730VacuumAl电性能(ohmspersquare)真空电镀铝1.在结构简单的平面电阻测量很好2.当厚度低于2.5微米时导电性下降很快3.当底材塑料件设计较复杂时一个chamberfiring的3~4.5微米的厚度是不足够的4.凹槽中的薄薄的铝层会造成一质量问题电性能(ohmspersquare)导电涂料1.导电涂料提供的面电阻值等于或更小于真空电镀铝2.针对具体的导电性要求具有更多的灵活性三种不同的导电涂料在不同的厚度下提供较低的电阻范围可以通过调整喷涂角度等技术来完成复杂结构件的喷涂电性能点对点电阻(Point-to-Point)点对点电阻影响因素两点之间的距离塑料件的结构造型两点间导电路径的宽度涂层的厚度点对点电阻是应用过程中的具体要求电性能点对点电阻(Point-to-Point)ABCDElectricalPerformancePoint-to-PointTest#1:AverageB3730SilverFilmThickness13.1µm020040060080010001200140016001800200015.614.214.513.211.512.015.011.614.712.510.913.114.41Firing1Firingthickness,micronsA-BC-DmVacuumAlB3730Silver(13Results)ElectricalPerformancePoint-to-PointTest#2:AverageB3730SilverFilmThickness9.9µm02004006008001000120014001600180020009.18.411.49.510.19.411.48.99.510.09.810.210.610.81Firing1Firingthickness,micronsA-BC-DB3730Silver(14Results)VacuumAlmElectricalPerformancePoint-to-PointTest#3:AverageB3730SilverFilmThickness7.4µm02004006008001000120014001600180020009.97.56.36.57.610.59.06.26.26.16.16.61Firing1Firingthickness,micronsA-BC-DmVacuumAlB3730Silver(14Results)电性能点对点电阻(Point-to-Point)针对于真空电镀导电涂料表现出更好的点对点的电性能当两点之间距离的增加塑胶件表面几何形状越趋复杂导电涂料表现出更多优越性较薄的涂层中导电值并没有明显的下降电性能点对点电阻(Point-to-Point)真空电镀铝的点对点电阻受以下因素影响很大1.结构件的几何形状2.两点之间的距离EMI测试数据对比/手机0102030405060700.92.74.55.46.37.2HybridCopperVacuumdBFrequency,GHz加速老化温度/湿度循环测试加速老化加速老化有多种测试项目1.湿度2.温度/湿度循环测试3.腐蚀如喷盐实验4.类似的工业环境测试5.其他UL746CCross-HatchAdhesionTestMethodTESTCRITERIA:5%CoatingRemovalbyCross-HatchTapeTestMethodASTMD3395-95TESTCONDITION:AsReceivedAfterAgingat85°Cfor56DaysAfterAgingat35°C+/-and90+/-5%RelativelyHumidityfor56DaysAfterThermalCycleTesting;1Hoursat85°C;Plus1Hoursat23°C;Plus1Hourat23°C4/4/16TemperatureHumidityTestTESTCRITERIA:3BorHigherRatingAfter20Cycles;EachCycleEquatesto24HoursTESTCONDITIONS:1.Dwell4Hoursat25°C+/-2°C;47.5%+/-2.5%RelativeHumidity2.RaiseTemp.Over2Hoursto+66°C+/-2°C;RaiseRelativeHumidityto92.5%+/-2.5%3.DwellatAboveConditionsfor4Hours4.HoldTemp.at+66°C+/-2°C;CoverRelativeHumidityto47.5%+/-2.5%5.DwellatAboveConditionsfor11Hours6.LowerTemp.Over2HourPeriodto25°C+/-2°C;MaintainRelativeHumidityat47.5%+/-2.5%7.RecycleTestTemperature/HumidityCycling00.0020.0040.0060.0080.010.0120.014071421B3755CopperB3740HybridB3730Silver4/4/16IBMTestMethodDays/Temperature/HumidityCycling00.050.10.150.20.250.30.350.40.450.5071421B3755CopperVacuumAl4/4/16IBMTestMethodVacuumAlshowsSignificantLossinResistivityoverTimeinAcceleratedAgingunlessProtectedwithaTopCoat/Days加速老化/导电涂料4/4/16测试后铜漆的电性能无明显变化喷盐实验后铜漆的性能有影响银漆及铜银混合涂料在加速老化实验后电性能有少许提高喷盐实验后银漆及铜银混合涂料电性能有少许提高加速老化/真空电镀真空电镀铝的导电性能在加速老化实验明显降低1.氧化腐蚀后的铝材料不导电2.侵蚀环境如喷盐实验后电镀铝层失去导电性3.生产过程中采用保护涂层工艺增加了工艺流程及生产成本附着力/密着力涂层附着力/导电涂料导电涂料技术对于多数塑料具有良好的附着力导电涂料由于是树脂/金属介质的混合物因而涂层中具有较低的内应力由于低内应力导电涂层对于注塑内应力具有良好的容忍性无需表面处理剂使用温和的溶剂通过ASTM5B的检测涂层附着力/真空电镀真空电镀铝极易受以下因素影响1.铝金属层中具有较大的内应力2.铝金属层与塑胶基材热胀冷缩系数相差大3.有些树脂底材对真空电镀的瞬间高温敏感4.对底材注塑内应力敏感5.对某些塑胶需要底漆保证附着力加工工艺加工工艺导电涂料1.机器人或手工喷涂2.自动化的供漆系统3.每小时可喷涂3000~5000片手机外壳4.新设备准备时间4~6周5.可返喷，可擦拭6.无需底漆加工工艺真空电镀1.需批量生产2.一个生产循环40~50分钟3.产量依赖于塑材几何形状、釜的大小4.新设备准备时间8~12周5.不可手工擦拭6.最多可电镀两次7.为增强附着力需用底料Productivity/CostProfileCoatingTypeCoatingWgt.,gr.Avg.*Pt-to-Pt,A-Bmilli-ohmsresistivityPt-to-Pt,A-Cmilli-ohmsresistivityEst.Parts/Gallon100%TEEst.Parts/Gallon50%TE*8PartsperCoatingSilver2500g/galCopper1000g/galHybrid1650g/gal0.3010.0910.1198,3484,1470.2350.2020.2504,2952,1470.2610.1170.1486,3483,174Productivity/CostProfileCoatingTypeCoatingWgt.,gr.Avg.*Pt-to-Pt,A-Bmilli-ohmsresistivityPt-to-Pt,A-Cmilli-ohmsresistivityEst.Parts/Gallon100%TEEst.Parts/Gallon50%TE*8PartsperCoating0.2610.1170.1486,3483,174HybridAfterDilution0.1220.5010.6256,570HybridBeforeDilution