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首页> 外文会议>Electronic Components and Technology Conference, 1991. Proceedings., 41st >The application of computerized processing techniques to manipulate and enhance the flow of non-Newtonian viscoelastic thixotropic materials in a production environment
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The application of computerized processing techniques to manipulate and enhance the flow of non-Newtonian viscoelastic thixotropic materials in a production environment

机译：在生产环境中应用计算机处理技术来操纵和增强非牛顿粘弹性触变材料的流动

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摘要

The flow process discussed takes advantage of the complicated, thixotropic nature of an RTV silicone paste using digital processing techniques and computer control to accomplish the desired processing result. The objective was to generate a barrier dam on hybrid circuits in substrate form using a silicone paste. The dam would later be filled in. The paste has to be precisely extruded through a geometrically complicated nozzle to produce the dams on up to 48 separate circuits per substrate simultaneously. The combination of a complicated flow path and a non-Newtonian, thixotropic material produced an inconsistent result. Evaluation of the material indicated that it exhibited stable upper and lower Newtonian regions in viscosity vs. shear rate plots. However, in the region between these two, the viscosity showed a very strong dependence on both shear rate and time at shear. Results showed that process conditions were imposing shear rates on the material which corresponded to viscosities that were highly dependent on both shear rate and time at shear. Since the volume of material extruded was fixed by the geometry of the dam and flow rate through the nozzle restricted by mechanical limitations, the shear rate as a result of flow was essentially fixed for the process.
机译：所讨论的流动过程利用了RTV硅酮糊剂的复杂，触变性，利用数字处理技术和计算机控制来实现所需的处理结果。目的是使用有机硅糊剂在基板形式的混合电路上产生隔离坝。坝随后将被填充。必须通过几何形状复杂的喷嘴精确地挤出浆料，以在每个基板上同时在多达48个单独的电路上产生坝。复杂的流路和非牛顿的触变材料的结合产生了不一致的结果。对该材料的评估表明，在粘度与剪切速率的关系图中，该材料显示出稳定的上部和下部牛顿区域。但是，在这两者之间的区域中，粘度对剪切速率和剪切时间都有很强的依赖性。结果表明，工艺条件对材料施加了剪切速率，该剪切速率对应于高度依赖于剪切速率和剪切时间的粘度。由于挤压材料的体积由坝的几何形状确定，并且通过喷嘴的流速受机械限制，因此，由于流动而产生的剪切速率在该过程中基本上是固定的。

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