Core-shell structure diamond micro-powder and preparation method thereof

The invention discloses core-shell structure diamond micro-powder and a preparation method thereof.The method includes the steps that highly-dispersed few-layer graphene oxide solution is used for wrapping diamond micro-powder, and then the diamond micro-powder wrapped with graphene oxide is reduced in the hydrogen atmosphere to obtain the core-shell structure diamond micro-powder wrapped with graphene; according to the obtained diamond micro-powder with the core-shell structure, the diamond particles are uniformly coated with the graphene, and the coated diamond particles are uniformly distributed on a microstructure and are densely stacked and arranged, so that friction among the diamond micro-powder particles under high pressure in a composite sheet synthesis process can be reduced, and the diamond micro-powder particles are stacked more compactly; according to the preparation method, the problem of uneven distribution of graphene in diamond micro-powder in the prior art can be solved, residual of redundan