670results about "Diamond" patented technology

The invention provides a polycrystalline diamond material with a double-peak structure and a preparation method of the polycrystalline diamond material, and relates to the technical field of superhard materials. The polycrystalline diamond material comprises the following raw materials: nano onion carbon and micron graphite, and the preparation method comprises the following steps: weighing the nano onion carbon and the micron graphite, carrying out mechanical grinding treatment, fully mixing to obtain mixed powder, pressing the mixed powder with a mold, and wrapping with boron nitride to obtain a green body; and the blank is loaded into a high-temperature and high-pressure synthesis cavity for high-temperature and high-pressure synthesis treatment, then heat preservation and pressure maintaining treatment is carried out, cooling and pressure relief treatment are carried out, and the polycrystalline diamond material with the double-peak structure is obtained. According to the method disclosed by the invention, the grain size with a'double-peak structure 'is constructed in the polycrystalline diamond, so that the fracture toughness of the polycrystalline diamond is improved by more than two times while high hardness is maintained, the extremely-hard and high-toughness polycrystalline diamond is successfully synthesized, and a reference is provided for toughening of other ceramic materials.

Luminescent diamond is made by subjecting a volume of diamond grains to high-pressure / high-temperature conditions with or without a catalyst to cause the grains to undergo plastic deformation to produce nitrogen vacancy defects in the diamond grains, increasing the luminescent activity / intensity of the resulting diamond material. The consolidated diamond material may be further treated to further increase luminescent activity / intensity, which treatment may comprise reducing the consolidated diamond material to diamond particles, heat treatment in vacuum, and air heat treatment, which reducing process further increases luminescent activity / intensity. The resulting luminescent diamond particles display a level of luminescence intensity greater than that of conventional luminescent nanodiamond, and may be functionalized for use in biological applications.

Luminescent diamond is made subjecting a volume of diamond grains and catalyst material to high-pressure / high-temperature (HPHT) conditions. A pressure apparatus and / or a pressure cell is specially configured to impose a differential or asymmetric pressure onto the diamond volume during the HPHT conditions. This subjects the diamond grains to differential strain that increases the degree of plastic deformation of the diamond grains to increase the formation of nitrogen vacancy centers. Diamond pellets formed by such process and subjected to differential pressure can have an aspect ratio, or an aspect ratio change, of greater than one. The temperature of the HPHT process is 1.800° C. or less to facilitate desired nitrogen migration to preferentially promote formation of NV centers over NVN and N3 centers in the diamond pellets to provide a degree of luminescence in a red wavelength spectrum greater than diamond pellets formed by some other HPHT processes.

The invention relates to a purification method of high-purity diamond, and relates to the technical field of diamond purification. The purification method comprises raw material pretreatment, microwave-assisted ionic liquid stripping, solid-liquid separation and ionic liquid recovery, deep purification, separation and drying, and the raw material pretreatment comprises the following steps: crushing an impurity-containing coarse diamond raw material into particles of 2-5mm, then carrying out wet ball milling in ethanol for 4-6 hours, refining the particles to 50-200 microns, and carrying out microwave-assisted ionic liquid stripping on the particles to obtain refined particles; immersing the particles into a mixed solution of 10% diluted hydrochloric acid and 2% ammonium bifluoride, performing ultrasonic treatment for 2 hours, and performing centrifugal washing with ultrapure water until the particles are neutral; the microwave-assisted ionic liquid stripping method comprises the following steps: mixing the pretreated raw material with an ionic liquid according to a mass ratio of 1: (5-10), and carrying out microwave treatment for 10-30 minutes to obtain a reaction mixture. According to the purification method, diamond impurities are efficiently removed, meanwhile, the surface structure of the diamond can be protected against damage, waste liquid can be recycled, and the influence on the environment is small.

Luminescent diamond is made by subjecting a volume of diamond grains to high-pressure / high-temperature conditions with or without a catalyst or pressure transfer media to cause the grains to undergo plastic deformation to produce internal vacancy defects, increasing the luminescent activity / intensity of the resulting diamond material. The luminescent material is then subjected to further treatment to create quantum dots on the surface of the diamond particles. Quantum dot formation can include placing the diamond particles in liquid and subjecting the particles to laser pulses. The consolidated diamond material may be treated to further increase luminescent activity / intensity including reducing the consolidated diamond material to diamond particles, heat treatment in vacuum, and / or air heat treatment. The resulting luminescent diamond particles display a level of luminescence intensity greater than that of conventional luminescent nanodiamond, and may be functionalized for use in biological applications.

The invention provides a high-performance nitrogen vacancy color center diamond material under yttrium oxide protection and a preparation method and application thereof, and belongs to the technical field of quantum materials. The preparation method comprises the following steps: firstly carrying out electron irradiation and cleaning on a diamond substrate, then processing by adopting nitrogen plasma, then depositing an yttrium oxide coating, and annealing the diamond substrate deposited with the yttrium oxide coating under a vacuum condition to obtain the high-performance nitrogen vacancy color center diamond material. According to the method, the diamond is treated through the nitrogen plasma, so that the displacement nitrogen concentration in the diamond can be increased, and the NV-color center concentration can be increased in the subsequent annealing treatment process; meanwhile, the yttrium oxide coating is deposited on the diamond substrate, so that defects on the surface of the diamond can be reduced, the NV-color center concentration is increased, and the prepared diamond material has excellent corrosion resistance. The diamond material prepared by the preparation method can be used for preparing quantum sensors used under extreme conditions.

The invention discloses an octahedral diamond synthesis method which comprises the following steps: preparing raw materials: selecting high-purity graphite powder and a powder catalyst, adding AlCl3 and KBH4 into the graphite powder to obtain graphite mixed powder, mixing the graphite mixed powder and the powder catalyst according to a weight ratio of (2-5): (5-8) to obtain mixed powder, adding a dispersing agent into the mixed powder, and uniformly mixing to obtain the raw materials, wherein the ratio of the dispersing agent to the mixed powder is 0.5: 6; the raw materials are put into a granulator to be granulated, and raw stone particles within 100 meshes are obtained; adding the raw stone particles into a mold, and pressing by adopting a four-column press to obtain a graphite core column; according to the method, in the diamond synthesis stage, the method of pressure subsection slow rising and power subsection slow rising is adopted, a good environment is provided for production of the octahedral diamond, the quality of the octahedral diamond is improved, the crystal form consistency is high, meanwhile, a high-position repeated mode is adopted in the pressure stage, and the performance of the diamond is improved.

The present invention relates to a process for preparing diamond particles, comprising subjecting a nanodiamond precursor material to a pressure of at least 8 GPa and a temperature of at least 900°C, wherein the diamond precursor material comprises a polycyclic aromatic compound which contains from 10 to 200 fused six-membered aromatic rings.

The present invention provides a method for extracting biocarbon powder, which mainly involves first fully burning a biocarbon source and collecting the generated gas products; then alkali dissolving and acid dissolving the collected gas products in turn to further decompose carbon dioxide gas; then the decomposed carbon dioxide gas undergoes a substitution reaction with a magnesium bar to produce carbon powder, and then separates biocarbon powder with a particle size of about 50 to 100 nm. Therefore, the above extraction method eliminates the presence of N, H, O, S and other metals in the biocarbon source, the purity of the carbon powder reaches more than 99.99%, the extraction effect is high in purity, and the carbon requirements of synthetic diamonds are met; and the biocarbon source is not limited to animal hair and bone ashes, and various organic materials can be used, with strong versatility. The present invention also provides a method for preparing diamonds using the above biocarbon powder, by which diamonds with a color of D‑E level and a clarity of FL level can be obtained.

The present disclosure discloses a high-temperature and high-pressure preparation method for hexagonal diamond, which belongs to the field of superhard material synthesis technology. The method comprises making high-purity graphite into a precursor, assembling the synthesis block, and then subjecting it to heating, pressurizing, temperature holding, and pressure holding processes to obtain hexagonal diamond. The preparation method for hexagonal diamond according to the present disclosure allows high-purity graphite to achieve higher pressure along the c-axis direction, further promoting the phase transition of graphite. In addition, the temperature field where the precursor is located has a certain temperature gradient, which facilitates the transformation of high-purity graphite into hexagonal diamond and achieves a better conversion rate of hexagonal diamond.

To provide a surface-modified nanodiamond that enables selective accumulation of a sufficient amount of boron atoms in a cancer tissue or a cancer cell and has high killing and injuring ability against the cancer cell. The surface-modified nanodiamond of the present disclosure contains a nanodiamond particle, and a boron cluster-containing group and a group capable of recognizing a cancer cell as surface modification groups of the nanodiamond particle.

The utility model relates to the technical field of diamond micro-powder purification, in particular to an efficient diamond micro-powder separation and purification device, which can automatically remove diamond micro-powder from acid liquor in the process of pickling and purifying the diamond micro-powder, and is convenient to use and high in practicability. Comprising a bottom plate, a support and a box, and the box is fixedly mounted at the upper end of the bottom plate through the support; a pickling cavity is formed in the left portion of the box body, a cleaning cavity is formed in the right portion of the box body, the pickling cavity and the cleaning cavity are separated through the partition plate, the partition plate is fixedly installed on the box body, acid liquor is arranged in the pickling cavity, clear water is arranged in the cleaning cavity, a cavity is formed in the cylinder body, and the lower cover and the upper cover are arranged in the cavity. A plurality of groups of filter holes communicated with the filter cavity are formed in the cylinder body, and filter cloth is arranged on the inner side wall of the cylinder body.

An embodiment of the present invention provides a diamond formation device comprising: a reaction vessel in which a raw material liquid containing a carbon source is held and a substrate is placed in the raw material liquid; and an electrode part capable of generating plasma in the raw material liquid, wherein the substrate has at least one recess on a main surface on a side facing the electrode part. In addition, an embodiment of the present invention also provides a diamond-coated substrate comprising: a substrate having at least one recess on a main surface; and diamond directly formed on the main surface of the substrate.

The invention discloses a metalized diamond particle, a diamond / gallium-based liquid metal composite material and a preparation method thereof, and belongs to the field of composite thermal interface materials. The metallized diamond particle comprises a diamond particle, the surface of the diamond particle is coated with an immiscible alloy layer, the immiscible alloy layer contains a diffusion barrier component and a reaction wetting component, and the content of the diffusion barrier component in the immiscible alloy layer is not higher than 15 at% of the total content of the diffusion barrier component and the reaction wetting component; wherein the diffusion barrier component is one or more of tungsten, molybdenum and tantalum, and the reaction wetting component is one or more of silver and copper. The metallized diamond particles and the gallium-based liquid metal are combined to form the composite material, so that the diamond / gallium-based liquid metal composite material has more excellent thermal conductivity.

The invention provides a preparation method of a diamond NV color center. The preparation method comprises the following steps: preparing one or more slotted nano structures on the surface of diamond; placing the diamond with the slotted nano-structure in a nitrogen source solution without metal elements, and performing pulse laser induced nitrogen injection by aligning laser to the area where the slotted nano-structure is located; and carrying out annealing treatment on the diamond subjected to pulse laser induced nitrogen injection to obtain the diamond with the NV color center. Nitrogen element shallow layer injection and nanoscale positioning in NV color center preparation are achieved at the same time.

The embodiment of the invention discloses a preparation method of a high-purity large-size hexagonal diamond, which comprises the following steps: S1, cutting along the c axis of highly oriented pyrolytic graphite to obtain cylindrical highly oriented pyrolytic graphite as a raw material precursor; s2, assembling the raw material precursor in a high-pressure heating synthesis assembly; s3, the high-pressure heating synthesis assembly is heated and pressurized to set pressure and set temperature, heat preservation is conducted for set time, and the high-purity hexagonal diamond is obtained; wherein the set temperature ranges from 1300 DEG C to 1900 DEG C, the set pressure ranges from 20 GPa to 25 GPa, and the set time ranges from 10 min to 20 min. According to the preparation method of the high-purity large-size hexagonal diamond disclosed by the embodiment of the invention, cylindrical high-orientation pyrolytic graphite cut along a c axis is used as a raw material precursor, the high-orientation pyrolytic graphite is completely converted into the high-purity large-size hexagonal diamond under set conditions, and the size is 1-2 mm; the method has important application prospects in the fields of superhard materials, semiconductor devices and the like.

The invention relates to the technical field of diamond purification, in particular to micro-powder purification equipment for artificial diamond processing, which comprises a pickling tank, the top cover is assembled at the top of the pickling tank; the mounting frame is fixed on the top cover; the first opening is formed in the mounting frame; the second opening is formed in the top cover, and the second opening is right opposite to the first opening; the lifting structure is arranged in the pickling tank; the stirring structure is arranged in the pickling tank; and the driving structure is arranged on the mounting frame. Compared with the prior art, the screen drum is driven by the motor to reciprocate up and down in the pickling solution, so that the diamond micro-powder is uniformly dispersed in the pickling solution, the micro-powder is prevented from settling to the bottom, the contact area of the micro-powder and the pickling solution is increased, and the purification and impurity removal effects of the pickling solution on the diamond micro-powder are improved; the stirring piece in the equipment is driven by the motor to rotate through the gear transmission system, the pickling solution is stirred, and the fluidity of the pickling solution is enhanced.

The present application relates to a modified diamond micro-powder and a preparation method and application thereof. The preparation method of the modified diamond micro-powder comprises the following steps: performing hydroxylation treatment on diamond micro-powder to obtain surface hydroxylated diamond micro-powder; performing pretreatment on the surface hydroxylated diamond micro-powder in a mixed solution of a silane coupling agent and an organic solvent under ultrasonic conditions with a frequency of 25KHz-40KHz and an intensity of 1W / cm 2 -3W / cm 2 to obtain pretreated diamond micro-powder; and performing vacuum heat treatment on the pretreated diamond micro-powder to obtain modified diamond micro-powder. The preparation method greatly improves the bonding force between the modified layer and the diamond and improves the micro-powder agglomeration, so that the pretreatment link before chemical plating has the feasibility of batch processing, which not only doubles the production efficiency, but also reduces the production cost to one third of the traditional method.

The invention discloses an electrophoretic sedimentation purification and separation method for submicron diamonds, relates to the field of diamond grading and purification, and aims to solve the problems of high separation difficulty, low purity, low efficiency and easiness in agglomeration in the prior art. According to the technical scheme, the method comprises the following steps: firstly, carrying out vibratory screening on diamond powder, and then treating the surface of the powder by using a strong oxidizing solution; and preparing the treated diamond powder into slurry, filling the slurry into an insulating vessel with an electric field, and carrying out electrophoretic separation and classification. After treatment with the strong oxidizing solution, the problem of powder agglomeration can be effectively solved, the purity of the diamond powder can be effectively improved, the diamond powder can have excellent dispersing performance, and a high-precision separation effect can be achieved through electrophoretic separation and grading. Furthermore, the high-oxidability solution for treating the diamond powder and the purified water for preparing the slurry can be recycled, so that the material consumption is greatly reduced, the whole separation process is carried out at normal temperature or lower temperature, and the energy consumption is lower.

The invention discloses a co-doped N-type diamond and a preparation method thereof, a semiconductor material and a semiconductor device. The beryllium atoms and the phosphorus atoms are co-doped in the diamond to form the co-doped N-type diamond, so that the carrier concentration, the mobility and the low resistivity are improved.

Polycrystalline diamond compacts, polycrystalline diamond blanks, polycrystalline diamond cutters, and tools incorporating same for cutting, milling, grinding, drilling and other abrasive operations, particularly in metal cutting applications, include a diamond table having a gradient in iron content that increases as distance into the volume of the diamond table increases. The iron gradient increases resistance to wear, such as in interrupted milling tests. The disclosure further relates to methods of manufacturing polycrystalline diamond compacts having a gradient in iron concentration in the diamond table, blanks and cutters including polycrystalline diamond compacts, cutting tools incorporating such compacts, blanks and cutters, and methods of cutting, milling, grinding and drilling, particularly metal machining, using such compacts, blanks, cutters, cutting tools and drill bits.

The invention discloses a diamond smoothing and patterning method and device based on catalytic agent energy field auxiliary etching, and belongs to the technical field of diamond smoothing and patterning, smoothing or patterning of diamond is achieved through the combined action of a catalytic agent and an energy field, and the contact part of the diamond and a catalytic agent disc is in contact with the catalytic agent disc under the catalytic action of the catalytic agent. Enabling the part, in contact with the catalyst, of the diamond to be subjected to etching reaction or graphitization reaction with oxygen atoms, and enabling the part, not in contact with the catalyst disc, not to be subjected to reaction, so that the diamond generates a structure corresponding to the surface of the catalyst disc; and the material removal rate of the diamond is remarkably improved, and damage to the surface and the subsurface of the diamond is avoided.

The present invention provides a method for preparing photoluminescent carbon nanoparticles containing diamond structure by using low-rank coal, including a method for preparing carbon nanoparticles containing nano-diamond structure by using low-rank coal, characterized in that it comprises: step S1, ball-milling and sieving the low-rank coal to obtain coal powder; step S2, mixing the coal powder with a hydrogen peroxide solution in a certain proportion, stirring at a certain temperature and heating at normal pressure for reaction; step S3, filtering the solution after the reaction; step S4, drying the filtrate after the filtration to obtain carbon nanoparticles containing nano-diamond structure. The method of the present invention is simple, and the luminescent effect of the prepared carbon nanoparticles is simple and adjustable.

The present invention relates to diamond abrasive grains and a manufacturing method thereof, and provides tetradecahedral diamond abrasive grains with uniform size and shape. The manufacturing method of diamond abrasive grains according to the present invention allows for shape control and minimizes impurities and crystal defects, thereby manufacturing diamond abrasive grains for ultra-precision grinding in chemical mechanical planarization (CMP) processes.

Luminescent diamond is made by creating vacancies in diamond grains and heat treating the diamond grains by controlling a thickness of the diamond grains on a substrate. The heat treatment may occur in a temperature range that does not burn the diamond grains, and the controlled thickness produces an even color change and / or promotes oxygen terminations on the diamond particle surfaces.

The invention discloses a process for compositely plating a plating layer on the surface of diamond, and relates to the technical field of diamond composite plating. According to the method, firstly, the diamond micro powder is pretreated through chemical plating, then plating is conducted through electroplating, and finally the obtained plating is subjected to characterization testing. According to the diamond surface composite plating process, through combination of chemical plating and nickel electroplating, the electrical conductivity of the diamond micro-powder and the binding force of the diamond micro-powder and the metal matrix are improved, the uniformity and stability of the plating are ensured, the mechanical performance and the surface quality of the plating are enhanced, and meanwhile, the diamond surface composite plating process is suitable for various metal matrixes and diamonds with different particle sizes; the working efficiency is improved; and the production cost is reduced.

The invention discloses easy-to-disperse diamond grinding fluid and a preparation method thereof, and relates to the technical field of grinding fluid. The easy-to-disperse diamond grinding fluid is prepared from the following raw materials in parts by weight: 1 to 20 parts of modified diamond micro powder, 40 to 80 parts of deionized water, 1 to 10 parts of polyethylene glycol 6000, 0.5 to 1.2 parts of sodium carboxymethyl cellulose, 1 to 20 parts of glycerol, 1 to 10 parts of triethanolamine, 0.3 to 0.7 part of sodium polyacrylate, 0.05 to 5 parts of 1, 2-benzisothiazolin-3-ketone and 1 to 10 parts of a modified silane coupling agent. According to the easy-to-disperse diamond grinding fluid, through the synergistic effect of the modified diamond micro powder and the modified silane coupling agent, the dispersity is excellent, and the stability is high; the formula is scientific, polyethylene glycol and other assistants are matched, precise process parameters and graded filtration are combined, the grinding efficiency is high, the surface smoothness of a workpiece is good, the antibacterial property and storage stability are good, and the application scene is wide.

A cutting blade (10) is provided with: a plate-shaped base material (20); a coarse-grain film (31) comprising particles having an average particle diameter of 0.5 [mu] m or more; and a fine particle film (32) comprising particles having an average particle diameter of less than 0.5 [mu] m. Furthermore, the base material (20) has a cutting edge (21) and a cutting edge part (22), the cutting edge (21) is at least a part of the outer edge, and the thickness of the cutting edge part (22) becomes smaller when the cutting edge part (22) is closer to the cutting edge (21). The coarse grain film (31) covers the surface of the cutting blade part (22) and the blade tip (21), and the fine grain film (32) covers the surface of the coarse grain film (31) on the blade tip (21).

The diamond member has a rake face and a flank. The ridge between the rake face and the flank forms a cutting edge. The arithmetic mean roughness of the rake face is 0.1 μm or more and 1.0 μm or less. The diamond member is measured for energy loss associated with the excitation of K-shell electrons of carbon by electron energy loss spectroscopy using a transmission electron microscope. The energy loss is used to measure the π bond originating from the carbon π bond in the graphite phase. * The intensity of the peaks and the σ due to the σ bond of carbon in the graphite phase and the diamond phase are * The peak intensity is calculated. * The peak intensity is σ * Divide the value by the peak intensity to obtain I π* / I σ* When the diamond material on the surface of the rake face is π* / I σ* is between 0.2 and 2.