Hydrogen Release Law of Electroless Nickel Plating on Aluminum-based Silicon Carbide Composites
Aluminum based silicon carbide composite materials have the characteristics of high thermal con-ductivity,low thermal expansion,and good dimensional stability;therefore,the composites are widely used in space microwave component shell products.In order to meet the functional requirements of conductivity,welding,and heat dissipation when applied to antenna microwave components,aluminum based silicon carbide composite materials need to be chemically plated with nickel,which introduces hydrogen,thus requiring research on hydrogen release and control.Here,the hydrogen distribution of nickel plating on aluminum based silicon car-bide has been analyzed,and SEM,XRD and other methods are used to characterize the microstructure of aluminum based silicon carbide substrate and nickel plating layer.There are certain pore structures in both the sub-strate and plating layer,providing a place for hydrogen storage.The experimental method of hydrogen microprinting has been used to characterize the distribution of hydrogen.The results showed that the hydrogen distri-bution pattern in aluminum based silicon carbide nickel plating are as follows:after nickel plating on aluminum based silicon carbide,hydrogen is distributed in the nickel plating layer and the shallow substrate under the coating,and with the extension of time,hydrogen spontaneously diffuses to the deep substrate,and hydrogen is mainly distributed in the Al matrix and less on SiC particles,especially,distributed in micropores and dislocation defects in the substrate and Ni.Herein,TDS has been used to test the hydrogen release of aluminum based silicon carbide nickel plating after hydrogen removal at different temperatures.The results show that hydrogen release is significantly reduced after high temperature hydrogen removal,and high temperature is beneficial obviously for hydrogen release.
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