Narrow-granularity thermally-stable tungsten carbide powder and preparation method thereof
A tungsten carbide, thermally stable technology, applied in the field of metal powder, can solve the problems of wear, limited application of tungsten carbide, large friction coefficient of friction system, etc.
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Embodiment 1
[0031]A preparation method of a narrow particle size thermally stable tungsten carbide powder, the preparation method of the narrow particle size thermally stable tungsten carbide powder comprises the following preparation steps:
[0032] (1) The graphite was sent into a plasma chamber with a frequency of 0.5 MHz and a power of 500 W, and the hydrogen was fed at 10 sccm to a pressure of 2 kPa, then heated to 300 ° C at 20 ° C / min, kept for 35 min, and then at the same speed. Introduce oxygen to a pressure of 4kPa, heat up to 600°C at 25°C / min, keep the temperature for 25min, repeat the above operation 3 times to obtain a graphene oxide composite;
[0033] (2) after peeling off the graphene oxide composite 5 times with scotch tape, place in the ultrasonic processor with a frequency of 30kHz, abrasive 25min, then place in jet mill equipment, abrasive 20min at 10000rpm, obtain graphene nano-sheet;
[0034] (3) Heating ammonium paratungstate at 280°C for 3 hours, adding deionized ...
Embodiment 2
[0039] A preparation method of a narrow particle size thermally stable tungsten carbide powder, the preparation method of the narrow particle size thermally stable tungsten carbide powder comprises the following preparation steps:
[0040] (1) The graphite is sent into a plasma chamber with a frequency of 0.5 MHz and a power of 900 W, and hydrogen is fed at 40 sccm to a pressure of 5 kPa, then the temperature is raised to 500 ° C at 40 ° C / min, and the temperature is maintained for 15 minutes. Pour oxygen to a pressure of 7kPa, heat up to 800°C at 55°C / min, keep the temperature for 10min, and repeat the above operation once to obtain a graphene oxide composite;
[0041] (2) after peeling off the graphene oxide composite 10 times with scotch tape, place it in the ultrasonic processor with a frequency of 45kHz, abrasive 15min, then place in jet mill equipment, abrasive 10min at 14000rpm, obtain graphene nano-sheet;
[0042] (3) Heating ammonium paratungstate at 360°C for 1 hour,...
Embodiment 3
[0047] A preparation method of a narrow particle size thermally stable tungsten carbide powder, the preparation method of the narrow particle size thermally stable tungsten carbide powder comprises the following preparation steps:
[0048] (1) Put the graphite into a plasma chamber with a frequency of 0.5MHz and a power of 700W, feed hydrogen gas at 25sccm to a pressure of 4kPa, heat it up to 400°C at 30°C / min, keep the temperature for 25min, and then at the same speed Introduce oxygen to a pressure of 6kPa, heat up to 700°C at 40°C / min, keep the temperature for 17min, and repeat the above operation twice to obtain a graphene oxide composite;
[0049] (2) after peeling off the graphene oxide composite 7 times with scotch tape, place in the ultrasonic processor with a frequency of 38kHz, abrasive 20min, then place in the jet mill equipment, abrasive 15min under 12000rpm, obtains graphene nano-sheet;
[0050] (3) Heating ammonium paratungstate at 320°C for 2 hours, adding deioni...
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