Characterization And Fabrication Of Porous Nickel On The Basis Of Carbon Skeleton

Porous nickel is popular in a wide range of field because of its many excellent physical properties such as light mass, flame retardance, strong absorbed energy ability and electromagnetic shielding. The surface pretreatment technology of carbon skeleton and the law of effect about the structure and property of the nickel deposition when filling different dispersant into the electroplate bath was investigated and discussed. And the discussion is mainly about the concentration of the ammonium persulfate and sulphuric acid, and the influence and mechanism of the electroplating's dispersant to the surface of the carbon skeleton and nickel deposition coating. The compression characteristics and volume weight is also major point which the electroplating's dispersant affects. The target is getting the best technologcial conditions of the porous nickel's preparation.As the reserch indicate:The surface of carbon skeleton will be more smooth, when chroma of ammonium persulfate in expansion coursed liquid is less than 200g/L, and when the chroma is more than 250g/L, the carbon skeleton will be over etching. Meanwhile the compression strength will increase as the adding of ammonium persulfate, and the compression strength will get to the biggest when the chroma is 200g/L. As for the chroma of sulfate in expansion coursed liquid, when it is less than 100mL/L, the compression. strength of porous nickel changed a little, but the strength will reduce obviously when the chroma is more than 100ml/L. Moreover, the property will goes better as the increasing of time and roughness of the surface of carbon skeleton A/m2.The intergrated ananysis indicates that the best technique of the expansion of rough of carbon skeleton is as follows: The chroma of ammonium deposition and sulfate is 200g/L, and the time of expansion of rough is 40min.And the good porous nickel which is with even coating, fine grain, smooth surface and good mechanical property can be get when we use the sodium citrate as the dispersant which is better than anhydrous sodium sulfate and magnesium sulfate. from the conclusion of orthogonal experiments.The technics of electrodepositing foam were confirmed:NiSO4·7H2O 300g/L; NiCl2·6H2O 40g/L; H3PO440g/L; saccharin 3g/L; lauryl sodium sulfate 0.3g/L; the sodium citrate 30 g/L; pH 4.0; Current density 5 time of the mass of carbon skeleton A/m2; Temperature 55℃; the plating 6 hour.The plating abilities equally of plating liquid were improved by some additives worked in. Additives can make cathode more polarized and platingequally.At the same time,different additives were used in plating liquid together can improved the plating abilities of the liquid. Under this condition, foam metal had the better abilities,followed as:The porosity was 80-90%, the compressive strength was 1.71 MPa;theYoung'modulus was 0.054 GPaFrom the conclusion of orthogonal experiments.The technics of electrodepositing foam were confirmed:Ni(SO3NH2)2:550g/L,; NiCl2·6H2O 5g/L; H3PO440g/L; saccharin 4g/L; lauryl sodium sulfate 0.3g/L; pH4.1; Current density 5 time of the mass of carbon skeleton; Temperature 55℃; the plating 9 hour. Under this condition, foam metal had the better abilities,followed as:The porosity was 80-90%, the compressive strength was 16.3MPa;theYoung'modulus was 0.32 GPa.