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Dual stage modeling of moisture absorption and desorption in epoxy mold compounds

机译：环氧模塑料中水分吸收和解吸的双阶段建模

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摘要

A dual stage diffusion model is developed in this paper for both absorption and desorption processes. Both stages in moisture absorption and desorption, i.e., Fickian and non-Fickian process, are described mathematically using a combination of Fickian terms. Absorption and desorption tests are also conducted on six distinct commercial epoxy mold compounds (EMCs) used in electronic packaging. For absorption, the samples are subjected to 85 ℃/85% relative humidity and 60 ℃/85% relative humidity soaking, respectively. Desorption conditions are above glass transition temperature at 140 ℃ and 160 ℃. The dual stage models generate reasonable results for the diffusive properties and display outstanding experimental fits. All six compounds show strong non-Fickian diffusion behaviors, which are further verified by the experiments with different thicknesses. For absorption, while Fickian diffusion is dominant in the beginning of process, non-Fickian mechanism plays a large role with time increasing. Saturated moisture concentration associated with Fickian-stage diffusion appears to be independent of temperature under the tested conditions. For desorption, higher temperature leads to less percentage of the permanent residual moisture content in most compounds. At 160 ℃, 90% of the initial moisture for all samples is diffused out within 24 h, following an approximate modified Fickian diffusion process. The dual stage model developed in this paper provides a mathematical formulation for modeling anomalous moisture diffusion behavior using commercial finite element analysis software.
机译：本文针对吸收和解吸过程开发了一个双阶段扩散模型。水分吸收和解吸的两个阶段，即菲克过程和非菲克过程，都是使用菲克术语组合进行数学描述的。还对电子包装中使用的六种不同的商用环氧模塑化合物（EMC）进行了吸收和解吸测试。为了吸收，样品分别经受85℃/ 85％的相对湿度和60℃/ 85％的相对湿度浸泡。解吸条件高于玻璃化转变温度，分别为140℃和160℃。双阶段模型针对扩散特性产生合理的结果，并显示出出色的实验拟合。所有这六个化合物均表现出很强的非菲克式扩散行为，这在不同厚度的实验中得到了进一步验证。对于吸收而言，虽然菲克扩散在过程开始时占主导地位，但非菲克机制在时间增加中起着很大的作用。在测试条件下，与菲克阶段扩散相关的饱和水分浓度似乎与温度无关。对于解吸，较高的温度导致大多数化合物中永久残余水分含量的百分比降低。在160℃下，遵循近似修正的Fickian扩散过程，所有样品的初始水分的90％在24 h内扩散出去。本文开发的双阶段模型提供了使用商业有限元分析软件对异常湿气扩散行为进行建模的数学公式。

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  • 来源
    《Microelectronics & Reliability》 |2012年第7期|p.1401-1408|共8页
  • 作者

    Mark D. Placette; Xuejun Fan; Jie-Hua Zhao; Darvin Edwards;

  • 作者单位

    Department of Mechanical Engineering, Lamar University, PO Box 10028, Beaumont, TX 77710, USA Department of Mechanical Engineering, Texas A&M University,3123 TAMU College Station, TX 77843-3123, USA;

    Department of Mechanical Engineering, Lamar University, PO Box 10028, Beaumont, TX 77710, USA;

    Texas Instruments, Inc., MS3611, 13020 TI Blvd., Dallas, TX 75243, USA Apple Inc., 1 Infinite Loop, Cupertino, CA 95014, USA;

    Texas Instruments, Inc., MS3611, 13020 TI Blvd., Dallas, TX 75243, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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