Claims
- 1. Submicron titanium diboride powder comprising at least 99 weight percent titanium diboride, said powder having a surface area of between about 3 and 25 square meters per gram and containing less than 0.4 weight percent metal impurities and less than 0.1 weight percent carbon, wherein the nominal sectional diameter of at least 90 percent of the titanium diboride particles of said power are less than one micron, said particles being tabular to equidimensional hexagonal crystals having well developed faces, and a number median particle size of between about 0.08 and 0.6 microns, said powders being characterized by the property of being able to be cold formed and sintered to a density of at least 90 percent of the theoretical density for titanium diboride.
- 2. The titanium diboride powder of claim 1 wherein the surface area is between about 3 and 15 square meters per gram.
- 3. The titanium diboride powder of claim 1 wherein the surface area is between about 5 and 10 square meters per gram.
- 4. The titanium diboride powder of claims 1, 2, or 3 wherein at least 60 percent of the titanium diboride particles have a nominal sectional diameter of 0.7 microns or less.
- 5. The titanium diboride powder of claim 1, 2, or 3 wherein at least 98 percent of the titanium diboride particles have a nominal sectional diameter of 0.7 microns or less.
- 6. The titanium diboride powder of claim 1 wherein the ratio of the nominal sectional diameter to thickness of the titanium diboride tabular crystals is from 1.5:1 to 10:1.
- 7. The titanium diboride powder of claims 1, 2, or 3 wherein the powder contains less than 0.25 weight percent oxygen.
- 8. The titanium diboride powder of claim 7 wherein the titanium diboride contains less than 0.20 weight percent halogen as determined by X-ray spectrographic analysis.
- 9. The titanium diboride powder of claim 1 wherein the powder is substantially free of titanium diboride fragments less than 0.1 micron.
- 10. The titanium diboride powder of claim 1 wherein the number median particle size of the particles is between about 0.1 and about 0.5 microns.
- 11. The titanium diboride powder of claims 1, 2, or 3 wherein at least 70 percent of the titanium diboride particles have a nominal sectional diameter of 0.7 microns or less and wherein the ratio of the nominal sectional diameter of thickness of the titanium diboride tabular crystals is from 1.5:1 to 10:1.
- 12. The titanium diboride powder of claim 11 wherein the titanium diboride contains less than 0.20 weight percent oxygen, and less than 0.15 weight percent halogen as determined by X-ray spectrographic analysis.
- 13. The titanium diboride powder of claim 12 wherein the titanium diboride contains less than 0.3 weight percent metal impurities.
- 14. The titanium diboride powder of claim 13 wherein the number median particle size of the particles is between 0.1 and 0.5 microns.
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part application of my pending application U.S. Ser. No. 546,838, filed Feb. 3, 1975, abandoned for Sub-Micron Refractory Metal Boride Powder and Method for Preparing Same.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3253886 |
Lamprey et al. |
May 1966 |
|
3723601 |
Svanstrom |
Mar 1973 |
|
3979500 |
Sheppard et al. |
Sep 1976 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
45-22809 |
Aug 1970 |
JPX |
1273523 |
May 1972 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Takahashi et al., "Journal of Crystal Growth", vol. 40, 1971, pp. 139-143. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
546838 |
Feb 1975 |
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