3 results about "Diamond nanoparticles" patented technology

The present application relates to a kind of diamond nanoparticles infiltrates the method for reinforcing hard alloy and the composite material made, belongs to hard alloy strengthening field.The method is first mixed, dry screen powder by ball milling under argon protection to WC, Co, VC powder, then preliminary WC-Co hard alloy sample is prepared by spark plasma sintering process.The key step is to uniformly coat nano diamond dispersion liquid after the surface of sintered sample is polished, and cover protection plate, be placed in the crucible covered with diamond powder, in argon atmosphere, stage heating to 1250 DEG C and heat preservation 3h are carried out heat treatment, so that diamond nanoparticles infiltrate matrix, finally by ultrasonic cleaning to remove residue.The method significantly improves the hardness of hard alloy, the sample after processing significantly increases the vickers hardness compared with untreated sample without reducing core fracture toughness, effectively enhances the wear resistance of material, process is simple and controllable, suitable for high stress working condition tool material.

The invention discloses a diamond polishing solution and a preparation method thereof, and belongs to the technical field of precision polishing, the diamond polishing solution comprises the following components by weight: 0.1-10% of core-shell structure diamond (at) MOF nano-particles, 0.1-10% of a dispersant, 0.1-10% of a dispersant, and the balance of water. 0.5%-5% of a persulfate oxidant; 0.1%-2% of a zwitterionic buffer solution; 0.01%-1% of a self-repairing polymer; and the balance of deionized water. The core-shell structure diamond (at) MOF nano-particle takes nano-diamond as a core. The MOF shell layer provides permanent steric hindrance for diamond particles, the agglomeration problem is fundamentally solved, the polishing solution is long in storage period and extremely low in scratch risk, and the MOF shell layer breaks at a fixed point under pressure to release metal ions to catalyze oxidation reaction; sulfate free radicals activated according to needs provide super-strong oxidizing power; the self-repairing polymer dynamically repairs the micro-scratches; and micro-fluidic continuous preparation is adopted, so that nanoscale accurate control and high uniformity of the product are realized, and a reliable way is provided for industrial large-scale production.

The synthesis of sub-five-nanometer nanodiamonds with high uniformity and purity. Inspired by the formation of natural diamond, iron carbide nanoparticles embedded in iron oxide matrices as the carbon source were used. High-pressure-high-temperature treatment of the precursor yields nanodiamonds with tunable diameters down to 2.13 nm and 0.22-nm standard deviation. The disclosed synthesis procedures also include a method for forming fluorescent nanodiamonds.