片状铝粉的表面改性及其树脂复合材料的介电性能控制

发布时间：2018-06-28 00:24

本文选题：片状铝粉 + 钝化　；参考：《内蒙古科技大学》2015年硕士论文

【摘要】：近年来，电子产品微型化逐渐成为电子产业的主要发展方向，催生了无源电子器件尤其是嵌入式电容器的研究。嵌入式电容器材料中金属填料/高分子复合材料具有介电常数高，色散小等优点，同时也存在着介电损耗高、温度稳定性低等缺点。本文采用新工艺对片状铝粉表面改性，制备了改性铝粉/环氧树脂复合材料，对修饰铝粉及其复合材料的结构和性能进行了详细研究，主要结果如下：（1）以空气和微量水为氧化剂，通过溶液钝化，制备了钝化片状铝粉。研究发现，空气钝化加厚了铝粉自钝化层Al2O3，钝化膜均匀致密但薄，水钝化铝粉的二次钝化膜覆盖在自钝化膜外测，主要成分为Al(OH)3，表面疏松较厚。增厚钝化膜可以增加铝粉的电阻，减少漏电流；钝化膜越厚，材料的电阻率越大，漏电流越小。比较发现，Al(OH)3钝化膜能更好地调节钝化膜厚度，从而调节铝粉电阻、漏电流，调控铝粉/高分子复合材料的介电性能。（2）以有机分子OA、APS和ASA修饰片状铝粉，接枝率从大到小依次为ASA、OA和APS。这些铝粉与环氧树脂复合材料，随着铝粉填料含量的增加，介电常数和介电损耗都增大，Al-OA修饰铝粉在质量分数为30%，室温下测试频率1kHz时，与环氧树脂复合材料的介电常数为49.80，介电损耗为0.049。修饰铝粉/环氧树脂复合材料的介电常数随着电场频率的升高而降低，在电场频率较低时波动较大，频率升高时介电常数趋于平稳数，值略微降低；介电损耗则略微上升后逐渐降低；在25℃到130℃范围内，介电常数和介电损耗均随着温度升高而略微升高，总体增长幅度均在15%左右，，满足嵌入式电容器的要求。
[Abstract]:In recent years, the microminiaturization of electronic products has gradually become the main direction of the development of the electronic industry. The study of the passive electronic devices, especially the embedded capacitors, has the advantages of high dielectric constant and small dispersion in the embedded capacitor materials, and the dielectric loss is high, and the temperature stability is low in the same time. In this paper, a modified aluminum powder / epoxy resin composite was prepared by a new process, and the structure and properties of the modified aluminum powder and its composites were studied in detail. The main results are as follows:
(1) passivating flake aluminum powder was prepared by passivation with air and trace water as oxidizing agent. It was found that the passivation layer Al2O3 was thickened by air passivation, and the passivation film was uniform and thin, and the two passivation film of passivating aluminum powder was covered with self passivation film, the main component was Al (OH) 3, the surface looser was thicker, and the thickening passivation film could be increased. It is found that the Al (OH) 3 passivation film can better regulate the thickness of the passivation film, thus regulating the resistance, leakage current and regulating the dielectric properties of aluminum powder / polymer composites. (2) grafting of aluminum powder with organic molecules OA, APS and ASA, grafting. The rate from large to small is ASA, OA and APS., and the dielectric constant and dielectric loss increase with the increase of the content of the aluminum powder filler. The dielectric constant of the Al-OA modified aluminum powder is 30%. The dielectric constant of the epoxy resin composite is 49.80 and the dielectric loss is 0.049. modified aluminum when the test frequency is 1kHz at room temperature. The dielectric constant of the powder / epoxy resin composite decreases with the increase of the electric field frequency, and the dielectric constant tends to be stable when the frequency is low, and the dielectric constant decreases slightly, while the dielectric loss decreases slightly, and the dielectric constant and dielectric loss increase with the temperature range from 25 to 130. And slightly increased, the overall growth rate is around 15%, to meet the requirements of embedded capacitors.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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