Effects of electroless plating temperatures on microstructure and properties of silver-plated nickel powder
In order to explore the effects of temperature on the properties of silver-plated nickel powder during its preparation,replacement electroless plating and reduction electroless plating were used to prepare silver-plated nickel powder with silver nitrate as the source of silver and Ni particles as the matrix material.The conductive coating was prepared with powder as filler and unsaturated polyester resin as matrix,and its conductivity and electromagnetic shielding were tested and analyzed.The micro-morphology and macro-characteristics of silver-plated nickel pow-ders were characterized and analyzed by scanning electron microscope,energy dispersive spec-trometer,X-ray diffractometer,apparent density tester,tap density tester and DC Milliohm Me-ter,respectively.Results show that the Ag coating of the prepared silver-plated nickel powder is complete,uniform and compact when the electroless plating temperature is 40℃,and the silver content reachs 75.01%,and its compaction resistance reaches the value 293.15 mΩ.The apparent density and tap density of the powder are 5.417 g·cm-3 and 5.778 g·cm-3,respectively.The obtained coating composite has the resistivity 4.30 mΩ·cm,and the electromagnetic shielding ef-fectiveness is 45.27 dB,which show the good electromagnetic shielding performance.
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