Boron skin nitrogen core nano polycrystalline material, its preparation method and superhard tool
A nano and polycrystalline technology, applied in the manufacture of tools, cutting tools for lathes, turning equipment, etc., can solve the problems of easy graphitization and poor cutting effect
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Embodiment 1
[0036]The preparation method of boron skin nitrogen core nano-polycrystalline material comprises the following steps: first treating boron-containing carbon nanotubes and nitrogen-doped carbon powder with strong acid, and then drying them in vacuum; The doped carbon powder is uniformly wet-mixed with carbon nanotubes under ultrasonic conditions with absolute ethanol to fill the doped carbon powder into the boron carbon nanotubes, and then the filling is treated under vacuum conditions, and then pre-pressed to obtain Green body: sintering and solid-solution strengthening the green body to obtain a boron-skin nitrogen-core nano-polycrystalline material.
Embodiment 2
[0038] The preparation method of boron skin nitrogen core nano polycrystalline material comprises the following steps:
[0039] (1) 200 g of boron-containing carbon nanotube powder and 800 g of nitrogen-doped diamond powder were wet-mixed under the condition of an ultrasonic frequency of 20 Hz to obtain a filler.
[0040] (2), put the filler in a vacuum of 5×10 －3 Pa and a temperature of 1400° C. were treated for 5 hours, and then pre-pressed for 1 minute under a pressure of 40 MPa to obtain a green body.
[0041] (3) The green body was sintered and solid-solution strengthened for 30 minutes under the conditions of a temperature of 1800° C. and a pressure of 20 GPa to obtain a boron-skinned nitrogen core nano-polycrystalline material.
Embodiment 3
[0043] The preparation method of boron skin nitrogen core nano polycrystalline material comprises the following steps:
[0044] (1) Mix 300g of boron-containing carbon nanotube powder with a tube diameter of 50-200nm, 300g of nitrogen-doped carbon powder and nitrogen-doped diamond powder with a particle diameter of 2-50nm to obtain a mixture.
[0045] (2) Add 300 g of hydrofluoric acid to the above mixture for surface treatment at a temperature of 60° C. to dissolve boron-containing carbon nanotube powder, nitrogen-doped carbon powder and nitrogen-doped diamond powder After removing impurities in the mixture, wash it with deionized water until it is neutral, then dry it, wet-mix it evenly with 1000g of absolute ethanol, and then vibrate it with an ultrasonic vibrator with an ultrasonic frequency of 200Hz to obtain the filler.
[0046] (3), the mixture is in a vacuum of 10 × 10 －3 Pa and temperature of 1000°C were treated for 0.5h, and pre-pressed for 25min at room temperature...
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