無電解めっきと電気めっきによるセラミックス上への白金厚膜析出

Platinum

Thick platinum metal layer was deposited on ceramics using electroless- and electro-plating. The ceramics, which consist of ZrO2, Al2O3, SiO2, Na2O, and other oxides, were etched in HF solution, and then immersed in a platinum electroless plating solution containing Pt(NH3)2(NO2)2 and N2H4 as a reducting regent. The mass of the ceramics specimen slightly decreased with the electroless plating time and then in creased at a rate depending on temperature, but independent of Pt2+ concentration. Two μm thick platinum layer could be deposited uniformly on ceramics by electroless plating for 14.4ks at 323K. Electroplating of platinum in Pt(NH3)2(NO2)2 solution after electroless plating caused the formation of several tens μm thick platinum layer, and many cracks were formed on the platinum layer after long period of electro plating.