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

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