Nano Tungsten Carbide Doped Graphene Modified Lubricant

Graphene is a new carbon material with carbon atoms tightly packed into a single layer two-dimensional honeycomb lattice structure. It is the basic unit for the construction of the most commonly used solid lubricant - graphite. It has a lower friction coefficient than graphite. It is a new type of self lubricating coating additive.

However, the quality of graphene is light, which belongs to a kind of carbon material of single layer two-dimensional honeycomb lattice structure. As a lubricant used in the thermal spraying coating, there is a loss of graphene in the process of preparing powder and the preparation process of the coating. In addition, the surface area of the graphene is larger and the activity is high, when it is combined with the tungsten carbide powder powder. It is difficult to ensure uniform agglomeration in spray powder, so it is difficult to ensure that the coating has self lubrication and wear resistance.

The main way to solve this problem is to improve the surface of the modified graphene by in situ growth of nano tungsten carbide particles. By controlling the reaction conditions, the scale, morphology and distribution of the nano tungsten carbide particles on the surface of graphene oxide are controlled and the specific gravity is prepared, and it can be better compatible with the tungsten carbide powder. The modified graphene oxide of the fruit. According to this goal, researchers have developed a completely new scheme: the following contents are as follows:

The mixture of a certain proportion of graphene oxide, anhydrous ethanol, deionized water, ammonium partial tungstate and tungsten carbonyl precursor mixture is mixed. The specific preparation process is as follows: 2G graphene oxide is called, 1000g anhydrous ethanol is added to the mixture, mixed with 60g deionized water, and ultrasonic dispersion is used. In the instrument, 10mm amplitude rod, ultrasonic processing time of 60min and ultrasonic frequency of 12Hz were used to obtain the mixed solution of graphene dispersion. The mixture of ammonium polytungstate and 1% carbonyl tungsten, which was 99% of mass, were mixed into the precursor mixture containing tungsten, and the 1g containing tungsten precursor mixture was added into the dispersive solution of graphene and stirred 40min, in the process of mixing, dripping anhydrous ethanol and dropping the amount of 84g, then the obtained precipitation and filtration, heating 80 degrees centigrade in the oven and drying 20min, in the alumina crucible, in the alumina crucible, through a certain amount of H₂ in the tube reduction furnace and the H₂ flow rate of 100sccm, heating to 700 ℃ at the temperature of 20 ℃ / min. The heat preservation time is 1H and the final H₂ is cooled to room temperature. The modified graphene can be obtained and can be used as a self-lubricating and wear-resistant additive for graphene modified tungsten carbide.

For modified graphene, nanoscale tungsten carbide particles are grown in situ on the surface of the modified graphene. By controlling the reaction conditions, the scale, morphology and distribution of the nano tungsten carbide particles on the surface of graphene oxide are controlled, and the modified oxygen can be prepared with a certain specific gravity and better compatibility with tungsten carbide powder. As a self lubricating additive, it can be used as a self lubricating additive in the tungsten carbide spray powder, which can be well compatible with the powder powder. In addition, it can also be well mixed and doped with powder to ensure that the graphene and powder can reach a certain chimerism, achieve certain bonding strength, and ensure the powder in the process of spraying. No Department of graphene was sprayed at high temperature and high speed flame flow and weight loss or thermal damage.

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