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US 6,686,045 B2Granted
Composite fine particles, conductive paste, and conductive film
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsYasushi Takai, Iwao Kubota
Life of this patent
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Abstract
Composite fine particles each having a nickel base core whose surface is coated with an oxide are effective for improving shrinkage upon firing and metal oxidation during binder burnout. The nickel base core has the formula: Ni(1-a-b)ZaZ′b wherein Z is Ag, Au, Co, Cu, Pd or a mixture of any, Z′ is Li, K, Na, B, P or a mixture of any, 0≦a≦0.4, 0≦b≦0.1 (weight proportion), and a+b>0, and the coating oxide is an oxide of Ag, Ba, Co, Cu, Ni, Sn, Ti, Zr, rare earth elements including Y, Pd or a mixture of any.
Claims8
A composite fine particle comprising a core of the general formula (1):
- Ni(1-a-b)ZaZ′b (1)
- wherein Z is at least one element selected from the group consisting of Ag, Au, Co, Cu, and Pd, Z′ is at least one element selected from the group consisting of Li, K, Na, B, and P, “a” representative of a weight proportion of Z is 0 to 0.4, and “b” representative of a weight proportion of Z′ is 0 to 0.1 with the proviso that “a” and “b” are not both zero at the same time,
- at least a part of the core surface being coated with an oxide of at least one element selected from the group consisting of Ag, Ba, Co, Cu, Ni, Sn, Ti, Zr, rare earth elements including Y, and Pd.
Dependencies are inferred from the claim text.