Composite particle, composite material including the same, and method of producing the same

Abstract

The composite particle is capable of being firmly adhered to resin, etc. The composite particle of the present invention comprises: a nickel particle, in which a large number of stabber-shaped projections are provided in an outer surface; and a large number of microfine fibers being incorporated in the nickel particle. The nickel particles are deposited in an alkaline solution by a wet reduction process.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will now be described by way of examples and with reference to the accompanying drawings, in which:

FIG. 1 is an SEM photograph of composite particles produced as Example 1;

FIG. 2 is an enlarged photograph of the composite particles of FIG. 1;

FIG. 3 is a further enlarged photograph of the composite particles of FIG. 1;

FIG. 3 is a further enlarged photograph of the composite particles of FIG. 1;

FIG. 4 is an SEM photograph of composite particles produced as Example 2;

FIG. 5 is an enlarged photograph of the composite particles of FIG. 4;

FIG. 6 is an SEM photograph of composite particles produced as Example 3;

FIG. 7 is an SEM photograph of composite particles produced as Example 4; and

FIG. 8 is an SEM photograph of composite particles produced as Example 5.

Claims

1. A composite particle, comprising:a nickel particle, in which a large number of stabber-shaped projections are provided in an outer surface; anda large number of microfine fibers being incorporated in said nickel particle.

2. The composite particle according to claim 1, wherein parts of said microfine fibers are projected from said nickel particle.

3. The composite particle according to claim 1, wherein a particle diameter of said nickel particle is 0.1-10 μm.

4. The composite particle according to claim 1, wherein said microfine fibers are carbon nanotubes.

5. The composite particle according to claim 1, wherein the outer surface of said nickel particle is coated with a metal film.

6. A composite material, comprising:a matrix resin; andcomposite particles being mixed with said matrix resin,wherein each of said composite particles comprises:a nickel particle, in which a large number of stabber-shaped projections are provided in an outer surface; and a large number of microfine fibers being incorporated in said nickel particle.

7. The composite material according to claim 6, wherein parts of said microfine fibers are projected from each of said nickel particles.

8. A method of producing composite particles, comprising the steps of:adding a nickel compound, which acts as a nickel source, to a solution, in which microfine fibers, such as carbon nanotubes, are dispersed;producing an alkaline solution by adding alkali to the solution; andreducing nickel by warming the alkaline solution and adding a reducing agent constituted by hydrazine or hydrazine hydrate thereto,wherein nickel particles, in each of which a large number of stabber-shaped projections are provided in an outer surface and the microfine fibers are incorporated, are deposited in the alkaline solution by a wet reduction process.

9. The method according to claim 8, wherein metal powder or ceramic powder is added to the alkaline solution.

10. The method according to claim 8, wherein a carbonate ion source is added to the alkaline solution.

11. The method according to claim 8, wherein the microfine fibers are carbon nanotubes.

12. The method according to claim 11, wherein the carbon nanotubes are dispersed with gelatin.

13. A method of producing composite particles, comprising the steps of:adding a nickel compound, which acts as a nickel source, to a solution, in which microfine fibers, such as carbon nanotubes, are dispersed;producing an alkaline solution by adding alkali to the solution; andreducing nickel by warming the alkaline solution and adding a reducing agent constituted by hydrazine or hydrazine hydrate thereto,wherein nickel particles, in each of which a large number of stabber-shaped projections are provided in an outer surface and the microfine fibers are incorporated, are deposited by adding at least one substance selected from a group consisting of a sulfate ion source, an ammonia or ammonium ion source, and a nitrate ion source to the alkaline solution.

14. The method according to claim 13, wherein metal powder or ceramic powder is added to the alkaline solution.

15. The method according to claim 13, wherein a carbonate ion source is added to the alkaline solution.

16. The method according to claim 13, wherein the microfine fibers are carbon nanotubes.

17. The method according to claim 16, wherein the carbon nanotubes are dispersed with gelatin.