镀覆工艺对镀镍铝粉/硅橡胶复合材料电磁屏蔽性能的影响

Effect of Plating Process on Electromagnetic Shielding Property of Nickel-plated Aluminum Powder/MVQ Composites

采用不同镀覆工艺(置换法、还原法和先置换后还原法)制备镀镍铝粉,研究镀覆工艺对镀镍铝粉/甲基乙烯基硅橡胶(MVQ)复合材料电磁屏蔽性能的影响。结果表明:采用置换法制备的镀镍铝粉镍镀层厚度较小;采用还原法制备的镀镍铝粉镀层结合强度较低;采用先置换后还原法制备的镀镍铝粉镀层厚度较大,镀层结合强度较高;采用先置换后还原法制备的镀镍铝粉/MVQ复合材料电磁屏蔽性能优异,在30~3 000 MHz频段内,其电磁屏蔽效能在55~95 dB之间。

The nickel-plated aluminum powders were prepared by different plating process,for example,substitution method,reduction method and reduction after substitution,and the effect of plating process on the electromagnetic shielding property of nickel-plated aluminum powder/methyl vinyl silicone rubber(MVQ)composites was investigated.The results showed that,the nickel-plated coating thickness by substitution method was relatively small.The bonding strength of nickel coating by reduction method was relatively low.With the process of reduction after substitution,the coating thickness was relatively large,the bonding strength was high,the electromagnetic shielding property of resulted nickel-plated aluminum/MVQ composites was excellent,and the electromagnetic shielding efficiency was between 55 and 95 dB in the frequency band of 30~3 000 MHz.