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喷射成形铝硅材料具有良好的热膨胀系数、高热导率及轻质低密度特性,在航空航天领域逐步成为专用电子封装材料。铝硅材料中硅的含量很高,传统电镀前处理工艺中使用含氟的盐或酸,而含氟的盐或酸对人体和环境有较大伤害。镀前处理工艺是决定铝硅材料上镀层结合力好坏的关键。文中提出采用微喷砂方法对铝硅材料基体表面进行处理,替代含氟的镀前处理工艺。通过控制微喷砂的压力和时间、选择一定粒径的玻璃微珠可以得到均匀的表面。比较铝硅材料电镀金后的外观、镀层结合力和低温钎焊性能,最终得出最佳微喷砂工艺参数。
Spray forming aluminum silicon material has good thermal expansion coefficient, high thermal conductivity and light low density properties, and gradually become a specialized electronic packaging material in the field of aerospace. The content of silicon in Al-Si material is very high. The fluorine-containing salt or acid is used in the pre-treatment process of the traditional electroplating, while the salt or acid containing fluorine is more harmful to the human body and the environment. Plating pre-treatment process is to determine the bonding of Al-Si coating on the quality of the key. In this paper, micro-sandblasting method is proposed to treat the substrate surface of Al-Si material instead of fluorine-containing pretreatment process. By controlling the pressure and time of micro-blasting, a certain particle size of glass beads can be selected to obtain a uniform surface. After comparing the appearance of the Al-Si material after electrogalvanization, the coating adhesion and the low-temperature brazing performance, finally, the optimal micro-blasting process parameters are obtained.