| 摘要 |
Cross-linked polymer non-conductive cores (12) having a sulfonated cation exchange surface are carefully separated into fractions of equal size and density. Each fraction is separately plated preferably with a copper, palladium, nickel, titanium or any metal cation which will reduce with hydrazine to form a conductive metal flash coating (14 or 24). The flash coat plated microspheres are again separated into fractions of equal size and density. Each fraction is then given additional metal platings first of nickel (16 or 26), then preferably palladium (18 or 28), then a support layer for the palladium, followed preferably by a stabilizing metal layer (32) such as chromium. The thus plated microspheres (10 or 22) have uniformly thick platings and have a maximized surface area for the amount of metal plated making them particularly useful as catalysts or in electrical products or processes. Microspheres having a plating of palladium (18 or 28) exhibit a marked improvement in the adsorption of hydrogen both quantitatively and in rapidity. An inner nickel layer (16 or 26) between the copper flash coat (14 or 24) and palladium layer (18 or 28) and an outer nickel layer (20 or 30) atop the palladium layer serve to structurally stabilize the palladium layer during a heat production duty cycle without inhibiting hydrogen adsorption by the palladium layer.
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