▎ 摘　　要

NOVELTY - A coated diamond particle (A1) (100) comprises a solid core (102) comprising diamond; and at least one graphene layer (108) over at least a portion of the solid core. USE - As coated diamond particle useful for forming a polycrystalline compact (claimed); in fluid suspensions, polymers, elastomers, and earth-boring tools; in surface polishing, in the manufacture of drill bits, and as conductive filler materials for polymers and elastomers; for lubrication, thermal management, or grinding. ADVANTAGE - The coated diamond particle exhibits good physical properties, such as diameter, thickness of outer layer, electrical conductivity, thermal conductivity, mechanical strength, coefficient of thermal expansion, wettability, mass, geometry, surface energy, and specific surface area e.g. the specific surface area of coated diamond particles is 10-2200 m2/g (as determined by gas adsorption measurement). The coated diamond particles have the unique features associated with diamond particles, such as hardness and thermal conductivity, plus features of a graphene coating, such as wettability. When the coated diamond particles are used in suspensions or solids, the coated diamond particles can change some physical properties of the suspensions or solids e.g. the thermal conductivity, mechanical strength, and electrical conductivity of a fluid or solid can be increased by suspending graphene-coated diamond particles in it. The polycrystalline diamond compact exhibits improved durability, conductivity, and/or thermal stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method (M1) of forming a coated diamond particle involving coating a diamond particle with a charged species, and coating the diamond particle with a graphene layer; (2) a composition comprising a substance, and several coated diamond particles dispersed within the substance, where each coated diamond particles have a diamond core and at least one graphene layer formed over at least a portion of the diamond core; (3) an intermediate structure including a hard polycrystalline material comprising: a first several diamond particles; and a second several diamond particles, where at least one of the first several diamond particles and the second several diamond particles comprises several diamond particles having at least one graphene layer, and the first diamond particles and the second diamond particles are interspersed; and (4) a method (M2) of forming a polycrystalline compact involving: coating each of a several diamond particles with at least one graphene layer, and catalyzing the formation of inter-granular bonds between adjacent particles of the diamond particles. DESCRIPTION OF DRAWING(S) - The figure shows a view of the coated diamond particles. Coated diamond particle (100) Core (102) Carbon shell (104) Outer layer (106) Graphene layers (108)