Barium titanate-coated nickel powder and powder slurry

Abstract

The object of the present invention is to provide barium titanate-coated nickel powder and powder slurry, thereby solving the problem of inconsistency between the shrinkage rate of the internal electrode nickel powder and the ceramic dielectric properties during the co-sintering process of the metal internal electrode and ceramic medium layer of an MLCC. [Solution] The barium titanate-coated nickel powder according to the present invention has a nickel powder core with a specific surface area equivalent particle size d of 30 to 600 nm, and its surface has a double-shell structure, with the inner shell layer being an oxygen compound and / or a sulfur compound, and the outer shell layer being barium titanate. The barium titanate-coated nickel powder according to the present invention has a double-shell structure, and in addition to the advantage of improving the co-calcinability of nickel powder and dielectric material by the barium titanate outer shell, the oxygen compound and / or sulfur compound in the inner shell further increases the degree of bonding between nickel and dielectric material, thereby increasing the yield rate of such nickel powder in the process of manufacturing electronic components and improving the electrical performance of electronic components.

Claims

1. It has a nickel powder core with a specific surface area equivalent particle size d of 30 nm or more and 600 nm or less. The surface has a double-shell structure, The inner shell is composed of oxygen compounds and / or sulfur compounds. The outer shell is made of barium titanate. Barium titanate coated nickel powder characterized in that the average thickness of the inner shell layer is 1 nm or more and 25 nm or less, and the average thickness of the outer shell layer is 0.5 nm or more and 12.5 nm or less.

2. The barium titanate coated nickel powder according to claim 1, characterized in that the outer shell layer is one of the discontinuously distributed porous, dot-like, or island-like barium titanate.

3. The barium titanate-coated nickel powder according to claim 1, characterized in that the proportion of the barium titanate of the outer shell layer that covers the surface of the inner shell layer is greater than 50%.

4. The barium titanate coated nickel powder according to claim 1, characterized in that the oxygen compound and / or sulfur compound in the inner shell layer is at least one of nickel oxide, nickel sulfide, nickel hydroxide, and nickel carbonate.

5. The barium titanate-coated nickel powder has discrete distribution characteristics. Regarding variability, R = Dmax - Dmin > d, Here, Dmax is the particle size of the largest particle in the same field of view of the SEM image that counts 10,000 or more particles. The barium titanate-coated nickel powder according to claim 1, characterized in that Dmin is the particle size of the smallest particle in the same field of view of an SEM image that counts 10,000 or more particles.

6. A barium titanate-coated nickel powder slurry characterized by containing the barium titanate-coated nickel powder described in any one of claims 1 to 5 above.

7. The barium titanate-coated nickel powder slurry according to claim 6, characterized in that the nickel content is 35% or more and 95% or less.

Images