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AssigneeShoei Chemical Inc.
InventorsEiichi Asada, Yuji Akimoto, Shinichi Ono, Kazurou Nagashima, Mineto Iwasaki, Masayuki Maekawa
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An oxidation-resistant palladium powder containing one or more alkaline earth metal elements in a total amount of at least 0.005% by weight relative to Pd. The palladium powder is useful as a conductive component of a thick-film conductive paste and the resultant conductive paste can provide internal electrodes to a multilayered ceramic capacitor with minimized structural defects such as cracks or delamination. The palladium powder is produced by spraying a palladium salt solution containing one or more alkaline earth metal elements to form droplets and heating the droplets to a temperature of at least 1000.degree. C. The preferred amount of the alkaline earth metal elements in the Pd powder is from 0.005 to 0.1% by weight relative to Pd and the preferred alkaline earth metal elements are one or more elements selected from the group consisting of Mg, Ca, Sr and Ba.
An oxidation-resistant palladium powder containing at least one alkaline earth metal element incorporated therein in a total amount of from 0.005 to 0.1% by weight relative to Pd.
A thick-film conductive paste comprising palladium powder as a conductive component and a vehicle, said palladium powder containing at least one alkaline earth metal element incorporated therein in a total amount of 0.005 to 0.1% by weight relative to Pd.
A multilayered ceramic capacitor produced by printing a thick-film paste onto ceramic green sheets to form internal electrode patterns thereon, laminating the printed sheets, and firing the laminated sheets, in which the thick-film conductive paste comprises palladium powder as a conductive component and a vehicle, said palladium powder containing at least one alkaline earth metal element incorporated therein in a total amount of from 0.005 to 0.1% by weight relative to Pd.
A method for producing an oxidation-resistant palladium powder, the method comprising spraying a palladium salt solution containing at least one alkaline earth metal element incorporated therein in such amounts that the alkaline earth metal element is incorporated in a total amount of 0.005 to 0.1% by weight relative to the weight of Pd in the resultant Pd powder to form droplets and heating the droplets to a temperature of at least 1000.degree. C.
Dependencies are inferred from the claim text.