Preparation method of high-temperature-resistant graphene composite heat-dissipation lubricating fluid

The invention provides a preparation method of a high-temperature-resistant graphene composite heat dissipation lubricating fluid. The preparation method comprises the following steps: firstly, preparing a carbon sphere with a multi-channel structure, fully immersing the carbon sphere in a copper precursor, reducing to prepare a carbon/cuprous oxide sphere, calcining at high temperature to remove carbon, and then completely reducing copper oxide by using a reducing gas to obtain the porous copper hollow sphere. Grinding and dispersing the AlN spherical powder by using a titanate coupling agent to form alcoholic slurry, drying and calcining to obtain TiO2 coated AlN composite powder; the TiO2-coated AlN composite powder is subjected to secondary coating with a high polymer material, high-temperature carbonization is conducted, the temperature continues to rise, titanium oxide is reduced into titanium carbide, and the TiC/C-coated AlN composite powder is obtained; finally, stripping and dispersing the expanded