A kind of self-sharpening diamond and preparation method thereof
A diamond, self-sharpening technology, applied in the diamond field, can solve the problems of low utilization rate and waste of resources
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[0034] The present invention also provides the preparation method of the self-sharpening diamond described in the above technical solution, comprising the following steps:
[0035] According to the ratio of raw materials, cobalt, nickel, cerium, boron and graphite are mixed and then pressed and formed to obtain a graphite column;
[0036] The graphite column is sequentially subjected to nitriding treatment and compression synthesis to obtain the self-sharpening diamond.
[0037] In the present invention, cobalt, nickel, cerium, boron and graphite are mixed according to the ratio of raw materials and then pressed and formed to obtain a graphite column. In the present invention, the cobalt is preferably cobalt powder, and the particle size of the cobalt powder is preferably ≤48 μm, more preferably 45-47.5 μm. In the present invention, the nickel is preferably nickel powder, and the particle size of the nickel powder is preferably ≤48 μm, more preferably 45-47.5 μm. In the pres...
Embodiment 1
[0064] 30Kg of cobalt powder with a particle size of 48 μm, 10Kg of nickel powder with a particle size of 48 μm, 2Kg of cerium powder with a particle size of 48 μm, 1Kg of boron powder with a particle size of 48 μm and 55Kg of graphite powder with a particle size of 48 μm and a purity of 99.999% ( Graphitization treatment at 2900 ° C for 26 days) mixed in a three-dimensional mixer for 24 hours to obtain a mixture;
[0065] The mixture was isostatically pressed at 190 MPa for 15 min to obtain a cylinder with a diameter of 200 mm and a height of 500 mm; the cylinder was crushed into particles with a particle size of about 3 mm; 200 g of the crushed particles were placed in a four-column press (60MPa, 5s) to obtain a graphite column with a diameter of 48mm and a height of 40mm;
[0066] Put the graphite column into the nitriding container, vacuumize it, fill it with nitrogen, and carry out nitriding treatment under the pressure of 0.6MPa for 24 hours; The steel cup with the grap...
Embodiment 2
[0070] 28Kg cobalt powder with a particle size of 48μm, 9Kg nickel powder with a particle size of 48μm, 1.9Kg cerium powder with a particle size of 48μm, 0.9Kg boron powder with a particle size of 48μm and 57Kg graphite with a particle size of 48μm and a purity of 99.999% The powder (graphitized at 2900°C for 28 days) was mixed in a three-dimensional mixer for 24 hours to obtain a mixture;
[0071] The mixture was isostatically pressed at 190 MPa for 15 minutes to obtain a cylinder with a diameter of 200 mm and a height of 500 mm; the cylinder was crushed into particles with a particle diameter of about 3 mm; 200 g of the crushed particles were pressed in four columns Press on the machine (60MPa, 5s) to obtain a graphite column with a diameter of 48mm and a height of 40mm;
[0072] Put the graphite column into the nitriding container, vacuumize it, fill it with nitrogen, and carry out nitriding treatment under the pressure of 0.6MPa for 24 hours; The steel cup with graphite c...
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