Claims
- 1. A method of making an ultrafine nickel powder, comprising subjecting nickel chloride to a vapor phase hydrogen-reducing process in the presence of supplied sulfur to form an ultrafine nickel powder having a sulfur content of 0.02 to 1.0 wt % and an average particle size of 0.1 to 1.0 μm.
- 2. The method of claim 1, wherein the ultrafine nickel powder comprises individual particles, and a major portion of the individual particles are spherical particles.
- 3. The method of claim 2, wherein each individual particle is separate from substantially every other individual particle.
- 4. The method of claim 1, wherein the average particle size is 0.2 to 0.6 μm.
- 5. The method of claim 2, wherein the average particle size is 0.2 to 0.6 μm.
- 6. The method of claim 3, wherein the average particle size is 0.2 to 0.6 μm.
- 7. The method of claim 1, wherein the sulfur is supplied as sulfide.
- 8. A method of making an ultrafine nickel powder, comprising the steps of:vaporizing NiCl2 to form NiCl2 vapor; reacting the NiCl2 vapor with hydrogen in the presence of sulfur to form a mixture of Ni powder and by-product gas; wherein the nickel powder has a sulfur content from 0.02 to 1.0 wt % and an average particle size of from 0.1 to 1.0 μm.
- 9. The method of claim 8, wherein the sulfur is introduced into a reacting section of a reactor with the NiCl2 vapor.
- 10. The method of claim 8, wherein the sulfur is introduced into a reacting section of a reactor with an inert gas carrying the NiCl2 vapor.
- 11. The method of claim 8, wherein a major portion of the individual particles are spherical particles.
- 12. The method of claim 11, wherein each individual particle is separate from substantially every other individual particle.
- 13. The method of claim 12, wherein the average particle size is 0.2 to 0.6 μm.
- 14. The method of claim 11, wherein the average particle size is 0.2 to 0.6 μm.
- 15. The method of claim 8, wherein the average particle size is 0.2 to 0.6 μm.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-256234 |
Sep 1997 |
JP |
|
Parent Case Info
This is a Division of application Ser. No. 09/140,001 filed Aug. 26, 1998 now U.S. Pat. No. 6,402,803. The entire disclosure of the prior application(s) is hereby incorporated by reference herein in its entirety.
US Referenced Citations (9)
Foreign Referenced Citations (4)
Number |
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Country |
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Dec 1991 |
EP |
A-64-80007 |
Mar 1989 |
JP |
A-1-136910 |
May 1989 |
JP |
WO 9614953 |
May 1996 |
WO |
Non-Patent Literature Citations (1)
Entry |
Chemical Abstract, vol. 128, No. 26, Jun. 29, 1998 of JP 10 102105 A, Apr. 21, 1998. |