Powder for laminated ceramic capacitor internal electrode
A metal alloy powder containing at least two alloying elements selected from the group of Ni, Cu, Cr, Sn, Mn, Co and W containing 1 to 99% by weight Ni, 1 to 99% by weight Cu, 6 to 60% by weight Cr, 6 to 15% by weight Sn, 6 to 15% by weight Mn, 6 to 15% by weight Co, and/or 6 to 15% by weight W for use in laminated ceramic capacitors with an internal electrode wherein said electrode comprises a sintered body of said alloy powder. A metal alloy powder containing at least two alloying elements selected from the group of Ni, Cu, Cr, Sn, Mn, Co and W wherein the onset of oxidation of the alloy powder occurs above about 250° C.
1. A base metal alloy powder for a laminated capacitor internal electrode comprising:
15 to 30% by weight Ni,
at least one of up to 800 ppm Al and between 200 and 2400 ppm Si; and
the balance Cu and impurities.
2. An alloy powder according to claim 1 having an average particle size of between 100 nm to 700 nm.
3. An alloy powder according to claim 1 comprising particles having a spherical shape.
4. An alloy powder according to claim 1 , wherein the temperature at which onset of oxidation occurs is at least 250° C.
5. An alloy powder according to claim 4 , wherein the temperature at which onset of oxidation occurs is between 325° C. and 400° C.
6. A laminated ceramic capacitor comprising an internal electrode fabricated from an alloy powder according to claim 1 .