338results about "Diamond" patented technology

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 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.

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 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 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.

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.

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.

Low temperature synthesis, growth and doping methods and resulting materials are disclosed. According to an aspect, a method for material transformation includes providing a target material comprising carbon and / or hydrocarbon. The method also includes placing the target material within a fluid comprising a hydrogen source. Further, the method includes applying energy to the target material such that at least some of the target material is transformed to the same material with new beneficial bonding configuration.

The invention discloses a copper-diamond composite board with high heat conductivity and low expansion coefficient and a preparation method thereof, and belongs to the technical field of preparation of heat-conducting packaging materials for electronic equipment. The preparation method comprises the following steps: grinding and cleaning a base copper plate, milling a rectangular groove to obtain a pretreated base copper plate, and performing electrochemical etching on the pretreated base copper plate to obtain an etched base copper plate; filling a rectangular groove in the etched base copper plate with the carbon nano tube and modified diamond, and compacting for 1-2 minutes under 20-30 MPa to obtain a mixed base copper plate; and the copper covering plate covers one side of the mixed base copper plate filled with the carbon nano tube modified diamond, and then the mixed base copper plate is placed in a graphite mold to be subjected to direct current hot pressing sintering to obtain the copper-diamond composite plate. The prepared copper-diamond composite board has good heat conduction performance and low thermal expansion performance, the bending strength is high, and the problem that the brittleness of the material is too high is effectively solved.

This invention provides a highly efficient method for separating or concentrating lattice defect-containing nanoparticles (NDs). [Solution] A method for separating or concentrating lattice defect-containing ND particles, comprising irradiating a dispersion containing at least two types of ND particles selected from nanodiamond (ND) particles having at least one type of lattice defect and ND particles without the lattice defect with at least one type of excitation laser light having an energy greater than or equal to the resonance absorption energy of the lattice defect and at least one type of stimulated emission laser light, thereby selectively moving the ND particles having the lattice defect by the absorption optical pressure generated by the absorption of at least one type of excitation laser light and the stimulated recoil force generated by the action of at least one type of stimulated emission laser light, wherein the excitation laser light transitions electrons in the ground state of the ND particles to an excited state, and the stimulated emission laser light transitions electrons in the excited state to the ground state faster than spontaneous emission to generate stimulated recoil force.

The invention discloses an artificial diamond cleaning and purifying device, and relates to the technical field of artificial diamond cleaning and purifying, the artificial diamond cleaning and purifying device comprises a machine box, two U-shaped frames and concave strip plates are arranged on the left side and the right side of the machine box, the concave strip plates are respectively fixed on the top surfaces of the two U-shaped frames, the two transverse plates are respectively fixed on the two sides of the inner walls of the two concave strip plates, and the two U-shaped frames and the concave strip plates are arranged on the left side and the right side of the machine box. The threaded rod penetrates through and is rotatably installed in the middle of the sides, close to each other, of the two transverse plates, the inner threaded block is slidably installed on the outer wall of the threaded rod, the inner wall of the inner threaded block is meshed with the inner wall of a threaded groove of the threaded rod, and the outer wall of the inner threaded block is in sliding contact with the inner walls of the two concave strip plates; according to the artificial diamond cleaning device, the two sides of the inner screw block are limited through the rubber mats, and therefore the problem that the artificial diamond cleaning effect is poor due to the fact that the filter cartridge shifts during displacement is solved.

Provided is a single-crystal diamond wherein: the half width of an X-ray diffraction rocking curve is 20 seconds or less, the half width of the X-ray diffraction rocking curve being measured using CuKα rays in X-ray diffraction by means of a double-crystal method in which a diamond crystal is used as a first crystal, with a (0004) plane parallel arrangement; the half width of a peak at the Raman shift of 1332 cm-1 to 1333 cm-1 in the Raman spectrum is 2.0 cm-1 or less; the etch pit density is 10000 / cm2 or less, the etch pit density being measured by means of an etching test; and the nitrogen content in terms of the number of atoms is more than 0.1 ppm and at most 50 ppm.

The present invention relates to highly pure high performance polycrystalline diamond monolith, a method for manufacturing a single-crystal diamond, and uses thereof.

In certain examples, a poly crystalline (PC) diamond layer is processed to enhance the layer's TC (thermal conductivity) by a localized anneal confined to a subset region of the layer's processing surface. The temperature(s) of the localized anneal is sufficiently high to have damaged the processing surface if all of the processing surface were subjected to an anneal at such temperature(s). The localized anneal truncates grains extending into or beyond the processing surface to set or correspond with a low roughness attribute (e.g., not more than 1 nm). In another example, the localized anneal is preceded by performing a global anneal. The localized anneal results in unique physical attributes of the PC diamond layer including, e.g., the processing surface not being anneal-damaged, truncated diamond grains sufficient to set or correspond with an RMS roughness measure, and the TC being set as a function of grain sizes in the PC diamond layer and its thickness.

Provided is a nanodiamond aqueous dispersion in which nanodiamond particles can be present in water in a highly dispersed state. The nanodiamond aqueous dispersion includes water and nanodiamond particles dispersed in the water. A content of heavy metal is 1 part by mass or less with respect to 100 parts by mass of the nanodiamond particles. A horizontal projection area of the nanodiamond particles calculated from an analysis image obtained by low-temperature electron microscopy satisfies at least one condition selected from the group consisting of (a) to (d): (a) a percentage of 100 nm2 or more is 20% or less, (b) a percentage of 80 nm2 or more is 24% or less, (c) a percentage of 50 nm2 or more is 30% or less, (d) a percentage of 30 nm2 or more is 39% or less.

An exhaust valve includes a valve head and a valve stem extending from the valve head. The valve head includes a combustion face and a seat face. The combustion face and the seat face are on opposing sides of the valve head. The seat face is configured to matingly engage an opposing surface. The valve head is formed of a base material. A valve thermal management composition coats at least a portion of the seat face and comprises increased thermal conductivity relative to the base material of the valve head.

The invention belongs to the technical field of artificial diamond processing, and relates to a raw material pretreatment device and method applied to an artificial diamond synthesis process, and the method comprises the following steps: selecting graphite powder with the purity not lower than 99.9% as a carbon source main material, screening through a 100-mesh standard sieve, removing coarse particles with the particle size larger than 150 microns and impurities, and collecting screen underflow for later use; meanwhile, metal catalyst powder with the particle size of 5-10 microns is selected, the screened graphite powder is placed in plasma treatment equipment, inert gas is input to drive the graphite boat body to rotate in the furnace, it is ensured that all the surfaces of the biscuit can make continuous and uniform contact with the high-temperature inert gas, and therefore the sintering temperature of the biscuit is increased; the problem of uneven heating caused by the near-heat and far-cold effect in the static oven is fundamentally solved; and the biscuit is uniformly dehydrated and purified in all-dimensional hot air flow, so that insufficient pretreatment caused by local overheating or insufficient temperature is effectively avoided, and the quality stability of a final artificial diamond product is greatly improved.

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.

This method for producing a diamond thin film involves synthesizing a diamond thin film on a base material through a plasma CVD method, wherein a raw material gas containing C, H, and O is supplied to a vacuum vessel in which the base material is disposed, high-frequency current is applied to an antenna that is disposed inside or outside the vacuum vessel and that has a conductor element and a capacitive element which are electrically connected to each other in series to generate inductively coupled plasma inside the vacuum vessel, and the generated inductively coupled plasma is used for the plasma CVD method. When the diamond thin film is being synthesized, the plasma has the following characteristics: the electron temperature is 1.0 eV or more and 2.0 eV or less; the electron density is 1.0 × 1011cm-3 or more and 1.0 × 1012cm-3 or less; and the ion saturation current is 1.0 × 10-4 A or more and 1.0 × 10-2 A or less.

The invention provides diamond particle manufacturing equipment and a control method thereof. The equipment is characterized in that an explosion tank is used for containing carbon source slurry; the straightening device straightens the metal wire to be straightened to obtain a straightened metal wire; the electrode clamping device is connected with the power supply mechanism, and clamps and straightens the metal wire at a first position and a second position respectively; moving the target metal wire section into the carbon source slurry; the cut-off device cuts off the straightened metal wire at a third position after the electrode clamping device clamps the straightened metal wire, and a target metal wire section is obtained; and after the target metal wire section moves into the carbon source slurry, the power supply mechanism outputs direct-current electric energy to the target metal wire section through the electrode clamping device, so that the target metal wire section explodes, and the carbon source generates diamond particles under the high-temperature and high-pressure conditions. The effects of stably and continuously generating effective explosion and reducing the waste rate can be achieved, the safety of electric explosion can be improved, and the convenience of equipment operation and maintenance can be improved.

The present application belongs to the technical field of material science, and particularly relates to a molybdenum table for growing convex diamonds and a growing method. On one hand, the molybdenum table for growing convex diamonds comprises a bowl-shaped shell, at least four layers of annular rings, and a groove arranged at the bottom of the inner side of the bowl-shaped shell. On the other hand, the growing method for growing convex diamonds comprises the following steps: placing a substrate material into the groove of the molybdenum table; placing the molybdenum table with the substrate material into a microwave plasma chemical vapor deposition device; and processing the substrate material by using the microwave plasma chemical vapor deposition device to obtain a curved diamond. Compared with directly reducing the power to reduce the plasma area, the slant convex molybdenum ring group is used to control the size of the actual plasma area, so that the low-speed growth of the edge can be ensured, while directly reducing the power may lead to the edge position being unable to be covered by the plasma and thus unable to be effectively grown.

The invention relates to the field of diamond materials, in particular to a preparation method of a diamond material and a semiconductor device.The preparation method specifically comprises the steps that a polyion liquid layer containing nanometer nickel powder is formed on the surface of a diamond film; then carrying out pyrolysis at the temperature of 400 to 500 DEG C, and then growing graphene at the temperature of 800 to 1000 DEG C; according to the method, the dependence on expensive coating equipment is broken through, the preparation cost is greatly reduced while the performance of the diamond material is guaranteed, and more economical preparation options are provided for industrialization of field emission devices, thermal management devices and high-frequency electronic devices.

Provided is a nanodiamond dispersion composition having excellent dispersibility of nanodiamond particles in an organic dispersion medium. A nanodiamond dispersion composition including an organic dispersion medium, nanodiamond particles dispersed in the organic dispersion medium, and a fatty acid ester dispersing agent, the nanodiamond particles being surface-modified by a surface-modifying group or compound containing an organic group. The fatty acid ester dispersing agent preferably has a mass loss rate of 30% or less when held in an air atmosphere at a temperature of 200°C for 180 minutes.

The application discloses a method for recovering diamond from silicon carbide wafer grinding waste liquid, which comprises the following steps: adding a dispersing agent into the silicon carbide wafer grinding waste liquid, and then performing spray drying to obtain solid A; adding the solid A into an alkali solution, and performing ultrasonic and stirring treatment for a set time; after solid-liquid separation, solid B is obtained; adding the solid B into a strong acid solution, and performing ultrasonic and stirring treatment for a set time; after solid-liquid separation, solid C is obtained; adding the solid C into a surfactant solution, and heating and stirring for a set time; finally, adding a dispersing agent into the mixed system, removing wafer debris through flotation, and drying the remaining solid to obtain diamond; the dispersing agent is one of sodium hexametaphosphate, sodium tripolyphosphate or polyacrylic alcohol or a combination thereof. The method can effectively improve the recovery rate and purity of diamond abrasive grains.

The invention belongs to the technical field of diamond machining, and particularly relates to diamond surface metallization treatment equipment and a treatment method.The diamond surface metallization treatment equipment comprises a box body, a bearing platform plate is arranged in the box body, a treatment bottle is arranged on the upper side of the bearing platform plate, a shaking module is arranged outside the treatment bottle, and an isolation module is arranged in the treatment bottle; the shaking module comprises a magnetic ring, a circular groove is formed in the magnetic ring, a wedge-shaped groove is formed in the inner wall of the circular groove, a contact block is slidably connected to the inner wall of the circular groove, and a transmission rod is arranged on the upper side of the contact block; according to the diamond surface metallization treatment equipment and the treatment method disclosed by the invention, when the treatment bottle is shaken during the sensitization or activation treatment of the diamond, the shaking amplitude can be accurately controlled, so that the shaking strength and time are quantified and accurately controlled, and the working efficiency is improved. The diamond has a good foundation in the metallization treatment process, and the metallization effect is improved.

The present application provides a lightweight nanoporous diamond and a preparation method thereof, the preparation method comprising: subjecting a carbon source and a metal to high temperature and high pressure treatment to convert the carbon source into diamond, then cooling and depressurizing the carbon source to room temperature and pressure to obtain a composite material of diamond and metal; soaking the composite material in an inorganic solvent to remove the metal, thereby obtaining a lightweight nanoporous diamond. The preparation method of the lightweight nanoporous diamond provided in the present application can achieve the regulation of the pore size, porosity and density of the lightweight nanoporous diamond, thereby obtaining a lightweight nanoporous diamond with a low pore size, high porosity and low density. At the same time, the obtained lightweight nanoporous diamond also has high hardness and good mechanical strength. In addition, the preparation method provided is simple and easy to operate, which is conducive to the mass production of lightweight nanoporous diamonds.

Luminescent diamonds are produced by subjecting a volume of diamond grains to high pressure / temperature conditions, with or without a catalyst or pressure-transmitting medium, to plastically deform the grains, creating internal void defects and increasing the luminescence activity / intensity of the resulting diamond material. The luminescent material is then subjected to further processing to create quantum dots on the surface of the diamond grains. The formation of quantum dots can include placing the diamond particles in a liquid and subjecting the particles to laser pulses. The consolidated diamond material can be treated to further increase its luminescence activity / intensity, including reducing the consolidated diamond material to diamond particles, heat treatment in a vacuum, and / or air heat treatment. The resulting luminescent diamond particles exhibit higher levels of luminescence intensity than conventional luminescent nanodiamonds and can be functionalized for use in biological applications.

The invention provides a graphite core column for high-temperature and high-pressure synthesis of high-thermal-conductivity diamond and a preparation method, the graphite core column is of a three-layer concentric cylinder structure, and the graphite core column is sequentially composed of a nitrogen removal core layer, a catalytic reaction layer and a sealing pipe layer from inside to outside. The nitrogen removal core layer forms an active defense system, Ti / Zr elements located in the core react with nitrogen to produce stable nitrides, nitrogen impurities are firmly captured and fixed to the nitrogen removal core layer, and the diamond growth environment of the catalytic reaction layer is purified; and the catalytic reaction layer is formed by mixing a Ni-Mn-Cu ternary catalyst and graphite. The catalyst system ensures that the dynamic processes of dissolution and precipitation of the carbon source in the catalyst are consistent, and stable growth of diamond single crystals is facilitated; the outer-layer sealing pipe graphite is used for sealing an internal reaction system and preventing external pollution. The three layers of structures perform their own functions and cooperate with one another, impurity removal, growth and pressure maintaining are integrally designed, and the system solves the three core problems of nitrogen pollution, uneven growth and pressure fluctuation in synthesis of the high-thermal-conductivity diamond.