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AssigneeTadamasa Fujimura
InventorsTadamasa Fujimura, Masato Sone, Valeri Yu Dolmatov, Shigeru Shiozaki
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An aqueous suspension liquid of finely divided diamond particles comprising 0.05 to 160 parts by weight of a finely divided diamond particles in 1000 parts of water, wherein; (i) the finely divided diamond particles have an element composition consisting mainly of 72 to 89.5% by weight of carbon, 0.8 to 1.5% of hydrogen, 1.5 to 2.5% of nitrogen, and 10.5 to 25.0% of oxygen; (ii) and, almost all of said diamond particles are in the range of 2 mu to 50 nm in diameters thereof (80% or more by number average, 70% or more by weight average), (iii) and, said finely divided diamond particles exhibit a strongest peak of the intensity of the Bragg angle at 43.9° (20±20), strong and characteristic peaks at 73.5° (20±20) and 95° (20±2°), a warped halo at 17′(20±2′), and no peak at 26.5°, by X-ray diffraction (XRD) spectrum analysis using Cu-Ku radiation when dried, (iv) and, specific surface area of said diamond particles when dry state powder is not smaller than 1.50×105 m2/kg, and substantially all the surface carbon atoms of said particles are bonded with hetero atoms, and the total absorption space of said powder is 0.5 m3/kg or more, when dried. The diamond particles are very active and dispersible in aqueous liquid in stable, and have essentially same mechanical properties as that of usual diamonds.
A diamond powder consisting of fine diamond particles, wherein;
A method of producing an aqueous suspension liquid of finely divided diamond particles comprising steps of synthesizing a diamond/non-diamond mixture (blended diamond, BD) by a detonating technique using explosives, oxidizing the obtained crude diamond/non-diamond mixture to produce a suspension liquid, and separating a diamond-containing phase from the suspension liquid, wherein said oxidizing step is followed by a neutralizing step for mixing the oxidized product with a basic additive which is volatile itself or decomposition product thereof is volatile, to conduct a decomposing reaction with nitric acid being remained in the resultant of said oxidizing step.
A method of producing a diamond powder, comprising steps of centrifugally separating diamond particles to separate the diamond particles from an aqueous suspension liquid of finely divided diamond particles which comprises 0.05 to 160 parts by weight of finely divided diamond particles in 1000 parts of water, then drying the diamond particles at a temperature of not higher than 400° C., wherein,
Dependencies are inferred from the claim text.