72 results about "Synthetic diamond" patented technology

To provide a grinding tool capable of improving grinding accuracy and a manufacturing method thereof. [Solution] The grinding tool 1 comprises a plurality of diamond abrasive grains 2 made of synthetic diamond, and a substrate 3 to which the plurality of diamond abrasive grains 2 are fixed. The plurality of diamond abrasive grains 2 are fixed in a single layer to the surface 31 of the substrate 3. The surface of each of the plurality of diamond abrasive grains 2 has a plurality of flat surfaces 21 which are crystal faces, and corners 22 connecting the flat surfaces 21. When the grinding tool 1 is used to grind an object to be ground, the portion of the diamond abrasive grains 2 that comes into contact with the object to be ground is defined as the contact portion 11. The grinding tool 1 has more diamond abrasive grains 2 whose contact portions 11 are corners 22 than diamond abrasive grains 2 whose contact portions 11 are flat surfaces 21.

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.

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.

The invention discloses a crushing and shaping device for artificial diamond machining, and belongs to the technical field of diamond machining. The device comprises a rack, the top of the rack is fixedly connected with a feeding hopper, a roller crushing mechanism is fixedly installed on the inner wall of the rack, a bearing assembly is arranged below the roller crushing mechanism, the two sides of the rack are each fixedly provided with an airflow shaping mechanism, and each airflow shaping mechanism comprises a shaping cover; and feeding ports and discharging ports are formed in the side, close to the rack, of the shaping cover, transferring assemblies are arranged between the two ends of the bearing assembly and the two feeding ports, and the two discharging ports are obliquely arranged towards the roller crushing mechanism. According to the device, a traditional tandem type segmented operation mode is broken through, the roller crushing mechanism and the airflow shaping mechanism are arranged in parallel and level in space, after being crushed once, raw materials can enter a shaping stage through airflow and mechanical guide without being discharged and transferred, and automatic circulation reprocessing is achieved.

The utility model discloses an assembly structure for synthesizing diamonds by a high-temperature and high-pressure method, which relates to the technical field of diamond synthesis and comprises an outer layer structure, a middle layer heating and insulating system, a core reaction layer and a top covering layer which are sequentially arranged from outside to inside, the outer-layer structure comprises a pyrophyllite composite block, a pyrophyllite ring surrounding the outer side of the pyrophyllite composite block and a conductive steel cap fixed to the top, the middle-layer heating and insulating system comprises a heating sleeve embedded into the pyrophyllite composite block, a heating piece is arranged in the heating sleeve, a magnesium oxide insulating sleeve is wrapped in the heating piece, and the outer-layer structure and the middle-layer heating and insulating system are arranged in the heating sleeve. A vertically supported thick zirconium oxide column is arranged below the heating sleeve, the core reaction layer comprises a magnesium oxide crystal bed, a carbon source is placed on the magnesium oxide crystal bed, alloy is distributed around the carbon source, and the top covering layer comprises a thin zirconium oxide column covering the core reaction layer. The problems that in the prior art, obtained seeds with high carbon content grow fast, but the impurity removal capacity is weak, and the quality is poor are solved; the seeds with low carbon content are good in quality but small in size, and the economic benefit is low.

The invention discloses a method for preparing spherical or sphere-like polycrystalline diamond through chemical vapor deposition and a product thereof, and belongs to the technical field of artificial diamonds.The method comprises the steps that 1, a sheet is provided, and nano particles are arranged on the surface of the sheet to serve as nucleation points; (2) taking a sheet with nano particle nucleation points on the surface as a base material, firstly raising the temperature of the base material to 700-1200 DEG C by utilizing a chemical vapor deposition method, then introducing hydrogen and methane into the reaction cavity according to the volume flow ratio of the methane to the hydrogen being (1-7): 100, and depositing to form spherical or sphere-like polycrystalline diamond; and (3) separating the spherical or spheroidic polycrystalline diamond from the surface of the base material treated in the step (2), and further purifying to obtain the product spherical or spheroidic polycrystalline diamond powder. The method provided by the invention has the advantages of precise control of diamond particle size and maintenance of good sphericity, and the obtained spherical or spheroidic polycrystalline diamond is micron-sized, adjustable in size, high in sphericity and good in uniformity.

A microwave plasma chemical vapour deposition (CVD) reactor 1 for manufacturing synthetic diamond material comprises a microwave generator 8, a plasma chamber 2, a microwave coupling configuration 12

The utility model relates to the technical field of product demagnetization, in particular to a demagnetization device, which comprises a shell and a plastic bucket, and is characterized in that the shell comprises a lower shell and an upper shell, the lower shell and the upper shell are fixedly mounted together, a hole groove is formed in the top of the upper shell, a cylinder is inserted into the hole groove, and the plastic bucket is arranged in the hole groove. The outer surface of the cylinder is wound with a demagnetizing coil, and the outer surface of the bottom end of the cylinder is fixedly connected with a limiting ring. The demagnetizing device has the advantages that the demagnetizing coil is wound on the outer surface of the cylinder, the artificial diamond particles are put into the plastic barrel, and the plastic barrel is put into the cylinder and then taken out for demagnetizing, so that even if the plastic barrel is full of the artificial diamond particles, the plastic barrel can be demagnetized after being inserted into the cylinder; all the diamond particles are located in the magnetic field generated by the demagnetizing coil, so that the diamond particles in the plastic barrel can be demagnetized completely, the diamond particles can still be demagnetized completely under the condition that the artificial diamonds are stacked thicker, and the demagnetizing efficiency is improved.

The invention relates to a method for manufacturing a ceramic part from a sample of ceramic powder, comprising: heating said sample to a predetermined minimum temperature, generating and emitting a plurality of acoustic waves by a plurality of acoustic wave generators towards a focusing system, said plurality of acoustic waves together generating a sound intensity Ie at the input of said focusing system, focusing the plurality of acoustic waves in an acoustic focal region within the sample by the focusing system, the focusing system defining a product factor M, the focused plurality of acoustic waves together generating a minimum sound intensity at at least a portion of the acoustic focal region, the minimum sound intensity being at least M x Ie, and combining the minimum heating temperature applied to the sample of ceramic powder sufficient to sinter the ceramic powder in the portion of the acoustic focal region.

This application relates to the field of interior wall decoration materials, specifically disclosing a crystal diamond coating and its preparation method. The base slurry of the crystal diamond coating comprises the following components: antibacterial emulsion; water; defoamer; ethylene glycol; film-forming aid; bentonite; suspending agent; cellulose; odor-neutralizing multifunctional additive; and thickener. The antibacterial emulsion is a bio-based styrene-acrylic emulsion with antibacterial groups. The crystal diamond coating obtained by this application has strong decorative properties and broad-spectrum antibacterial ability. Furthermore, the antibacterial components are not prone to migration, degradation, or discoloration within the coating, resulting in more durable antibacterial performance. Simultaneously, this crystal diamond coating also possesses excellent formaldehyde removal capabilities, capable of effectively and persistently adsorbing and decomposing indoor formaldehyde under normal temperature, pressure, and light conditions. It is environmentally friendly and can be widely used in various locations with high antibacterial and environmental protection requirements.

The utility model belongs to the field of artificial diamond application equipment, and particularly relates to an artificial diamond electrolytic purification variable-frequency liquid flow regulation and automatic constant temperature device. Comprising an electrolytic cell, the electrolytic cell comprises a first electrolytic cell, a second electrolytic cell and a third electrolytic cell which are sequentially communicated, the first electrolytic cell and the third electrolytic cell are further communicated with an electrolyte adjusting pool, and the first electrolytic cell, the second electrolytic cell, the third electrolytic cell and the electrolyte adjusting pool are in circulating communication. The electrolyte adjusting tank is further communicated with a liquid supplementing tank, a liquid supplementing pump is further arranged between the electrolyte adjusting tank and the liquid supplementing tank, and a heat exchange pipe is further arranged in the electrolyte adjusting tank. Meanwhile, the electrolytic production device is simple in structure and convenient to process, and can be improved and upgraded on the basis of the prior art.

A microwave plasma reactor 1 for manufacturing synthetic diamond material via chemical vapour deposition (CVD) is disclosed, comprising a microwave generator 8, a plasma chamber 2, a coupling configur

This application belongs to the technical field of synthetic diamond manufacturing equipment, specifically disclosing a pressurizing device for a six-sided press, comprising: a cage, the interior of which is provided with a regular hexahedral pressure chamber, each with a conical positioning countersunk hole on its inner wall; eight secondary anvils forming a regular hexahedral composite, the outer wall of which is provided with a frustum corresponding to the conical positioning countersunk holes; and an octahedral pressure chamber inside the regular hexahedral composite. The conical positioning countersunk holes and the conical surfaces of the frustums cooperate to uniformly decompose the concentrated load applied by the external pressurizing hammer into normal clamping force and radial constraint force. This ensures that under ultra-high pressure conditions of tens of GPa, the secondary anvil can only move centripetally along its axial direction, and cannot undergo radial slippage or torsion. This reduces the risk of stress concentration and anvil breakage caused by anvil surface misalignment, ensuring the geometric stability and reusability of the secondary pressurizing device under extreme conditions.

The utility model discloses an artificial diamond synthetic raw material modification treatment device which comprises an annular heating bin, a plurality of electric heating wires are distributed in the inner wall of the annular heating bin in an annular array mode, and the left end and the right end of each electric heating wire are both electrically assembled and fixedly connected with electric heating ring seats. Positioning ring seats are fixedly embedded in the inner sides of the electric heating ring seats, the positioning ring seats are symmetrically erected in the left-right direction, clamping seats are embedded in the centers of the opposite sides of the positioning ring seats in a butt joint mode, and a plurality of limiting clamping plates are fixedly arranged on the opposite sides of the clamping seats in an annular array mode; the left and right opposite sides of the limiting clamping plate are correspondingly embedded into the inner wall of the positioning ring base and are fixedly clamped with the positioning ring base, and a driving motor and a shaft sleeve are rotationally matched with the left and right sides of the center of the opposite side of the clamping base correspondingly; the mixed raw materials are uniformly mixed and the heating temperature of the mixed raw materials is kept uniform and stable while the mixed raw materials are comprehensively heated at constant temperature.

The invention relates to the technical field of artificial diamonds, and discloses an artificial diamond preparation device and a preparation method thereof.The artificial diamond preparation device comprises a workbench and a mixing barrel arranged above the workbench, a driving motor is installed at the lower end of the mixing barrel, an output shaft of the driving motor rotationally penetrates through the mixing barrel, and a stirring rod is fixedly installed on the output shaft of the driving motor; the outer wall of the lower portion of the stirring rod is fixedly connected with a plurality of sets of connecting rods, the upper end of each connecting rod is fixedly connected with a screw rod, the driving motor drives the stirring rod to rotate, the stirring rod drives the stirring blades to rotate, and therefore the raw materials are stirred and mixed; therefore, the driving motor rotates to drive the connecting rod and the screw rod to rotate, raw materials can be better and conveniently discharged under the cooperation of the screw rod, particularly, the raw materials on the inner wall of the mixing barrel can be guided and conveyed along the spiral wall of the screw rod in a rotating state, conveying of the mixed raw materials is enhanced, and intervention of workers is reduced.

The invention belongs to the technical field of high-power semiconductor lasers, and discloses a heat sink sheet and a preparation method and application thereof. According to the preparation method provided by the invention, the artificial diamond with very excellent heat-conducting property is used as a substrate material for preparing the heat sink sheet, and the small through holes with specific apertures and specific arrangement intervals are introduced into the artificial diamond; high-temperature reduction treatment, magnetron sputtering tungsten plating treatment, magnetron sputtering copper plating treatment, high-temperature calcination treatment and sectional type hole filling copper electroplating treatment are matched, and high-precision filling of copper on the artificial diamond is achieved through cooperation of all the treatment steps. The obtained diamond / copper composite material has excellent heat-conducting property, electrical conductivity and deformation resistance, the thermal expansion coefficient of the diamond / copper composite material is highly matched with common semiconductor materials such as GaAs, the problems of high-heat-flux heat dissipation and thermal stress failure existing in an existing high-power laser device are effectively solved, and the diamond / copper composite material has very excellent application prospects.

The application discloses a furnace body structure of a synthetic diamond crystal growth equipment, and belongs to the technical field of synthetic diamonds, which comprises a base plate, a top cover arranged on the upper side of the base plate, supporting columns fixedly arranged between the top cover and the base plate, an upper cover arranged between the top cover and the base plate, supporting slide rods fixedly arranged on the outer surface of the upper cover, the supporting slide rods being slidably connected with the supporting columns, and a motor fixedly arranged on the upper end surface of the base plate. The buckle mechanism is arranged, the furnace body is automatically opened, the fixing effect and the stability of the furnace body are enhanced under the action of the fixing assembly and the reinforcing piece, meanwhile, the elastic sealing pieces are additionally arranged on the key joint surfaces, the gaps are filled by pressure self-adapting deformation, the repeated calibration steps required by the traditional multilayer sealing are reduced, under the premise of maintaining high sealing performance, the opening and closing operation steps are reduced to single triggering action, the artificial operation complexity is reduced, and the equipment operation efficiency and the operation stability are simultaneously improved.

This invention discloses a method for purifying artificially grown diamonds, comprising the following steps: Step 1, core heating, heating the material to 300℃-600℃; Step 2, rapid cooling, rapidly cooling the material to below 20℃; Step 3, vibration impact screening, screening different particles in a vibrating screen and using magnetic separation to remove internal metal materials; Step 4, surface adhesion removal, mixing the screened diamond separation with sawdust or rice husks at a ratio of 100:(1-10), repeatedly kneading for 0.5-5 hours, followed by screening; Step 5, surface attachment removal, ultrasonically cleaning the screened diamonds to remove surface attachments. This method for purifying artificially grown diamonds is completely different from traditional chemical processing methods. The entire process does not involve strong acid reactions, using a purely physical separation method for purification, effectively controlling costs and significantly reducing environmental pollution, making it suitable for mass production.

This invention relates to a multi-mode cutting device for synthetic diamond rods with 60 or more cavities. The device includes a housing, a pressure cylinder, a placement platform, a cutter, and a limiting device. The pressure cylinder is located at the center of the top surface of the housing, and the placement platform is correspondingly located on the bottom surface. The cutter is vertically positioned on the placement platform. The limiting device includes two identical limiting blocks, which are parallel and fixedly positioned on both sides of the cutter, symmetrically opposite to it. This multi-mode cutting device for synthetic diamond rods with 60 or more cavities can quickly cut the synthetic rod horizontally or vertically, facilitating observation of the cut surface and allowing adjustment of subsequent synthesis conditions, thus increasing the proportion of high-quality diamond material. The device is easy to operate, occupies little space, and can be placed at the diamond synthesis process site, offering convenient and quick use.

The present application belongs to the technical field of synthetic diamond production and processing, and proposes a process for synthesizing diamond with a wavy surface. A -300 mesh fine powder catalyst is prepared, containing 19% Ni, 0.05% Ti, 0.85% Si3N4, 0.1% CeO2, and 80% Fe. The -300 mesh fine spherical graphite powder is mixed with the premixed powder catalyst in a three-dimensional mixer and granulated, and then pressed into a core column. The core column is placed in a vacuum furnace for treatment and then loaded into a synthetic block for heating. A six-surface press is then used for high-temperature and high-pressure synthesis. The present application changes the raw material of the prepared high-iron catalyst, which not only speeds up the growth of diamond but also produces a noticeable wavy effect on the surface. By changing the structure of the synthetic block to increase the axial pressure, and by matching specific pressure and power to adjust the process, diamond with a wavy surface can be synthesized without affecting the overall performance of the diamond, which can solve the problem of low holding force of diamond during use.

A security device includes a metallic elongate body with at least one end attachable to a lock unit. The body has at least one track of material of the kind referred to above extending longitudinally on the surface thereof and metallurgically bonded therewith. The material of the track has particles of a hard cut-resistant material dispersed in a self-fluxing matrix of lower melting point than that of the body and comprising one of nickel, iron and cobalt in composition with chromium, silicon and boron. The tracks are normally applied to the elongate body by welding, preferably laser welding or laser cladding, but plasma arc welding or brazing might also be used. The lower melting point prevents melting of the elongate body while enabling the metallurgical bond. Tungsten carbide is the preferred hard cut-resistant material, but other materials might be used, such as silicon carbide, cubic boron nitride, or industrial or synthetic diamond.

The invention relates to the technical field of cubic presses, and discloses a cubic press for artificial diamond and a cavity temperature heating method.The cubic press comprises six pressure-bearing beams and a main holding-up hammer hydraulically sliding and stretching out and drawing back along the pressure-bearing beams; the head section of the main holding-up hammer is provided with a hydraulic sliding telescopic auxiliary holding-up hammer, and the head end of the auxiliary holding-up hammer protrudes out of the end face of the head end of the main holding-up hammer; when the main holding-up hammer is closed, the auxiliary holding-up hammers are in a contraction state, a gap is formed between every two adjacent auxiliary holding-up hammers, and the auxiliary holding-up hammers stretch out to apply pressure in a diamond synthesis stage; in the cooling stage after synthesis, the auxiliary holding-up hammers are closed; according to the cubic press, the auxiliary anvil capable of independently hydraulically stretching out and drawing back is arranged on the main anvil, and a staged cavity temperature heating and cooling pressure relief process is matched, so that the problems of non-uniform pressure, anvil cracking, blasting and the like caused by volume shrinkage of an existing cubic press in the diamond synthesis process are effectively solved.

The utility model discloses a kind of beam cylinder disengaging devices for synthetic diamond of six-face top hydraulic press, it is related to synthetic diamond technical field, the device includes base hinge beam, connecting lug, bolt, jacking assembly, four bolt holes are provided in the bottom of base hinge beam side, the base hinge beam is connected with synthetic equipment hinge beam by bolt and connecting lug, jacking assembly is arranged in the base hinge beam, for the beam cylinder in the jacking of synthetic equipment hinge beam.This utility model is driven by hydraulic pressure mode through jacking assembly, the stable jacking of beam cylinder is realized, the uneven stress problem caused by traditional artificial knocking or prying is avoided, the controllable telescopic motion of piston rod can control jacking degree and speed, reduce secondary damage of beam cylinder and hinge beam, protect equipment core component.

This invention discloses a clamping fixture for cutting synthetic diamonds, comprising a mounting base plate and a mounting cover. A telescopic placement component is mounted on the top of the mounting base plate, and a guide cover is fixedly mounted on the top of the mounting cover. An adjusting clamping component is installed inside the mounting cover and the guide cover, and an internal threaded ring is fixedly mounted on the bottom of the mounting cover. By starting a drive motor, the output end of the drive motor can drive a rotating column to rotate, which in turn drives a cross slide rod to rotate, and then drives a threaded rod to rotate. With the cooperation of the internal threaded ring, the threaded rod can rotate and move up and down inside the internal threaded ring, thereby pushing the adjusting clamping component to move inside the mounting cover and the guide cover, thus adjusting the relative positions of the three clamping discs. This allows for clamping of the synthetic diamond to be processed, facilitating subsequent cutting and processing. It also facilitates clamping synthetic diamonds of different sizes, improving the overall effectiveness of the device.

This invention relates to the field of electronic material manufacturing technology, specifically to an annealing method for large-size sapphire single crystals. For large-size sapphire single crystals with a diameter ≥ 6 inches, the steps include: placing the single crystal in a graphite crucible with a high thermal conductivity synthetic diamond buffer layer on its inner wall; performing dynamic pulse cyclic annealing under a mixed protective atmosphere using independent temperature control in both the center and edge zones; during the annealing process, using a non-contact temperature sensing component to acquire the temperature gradient in real time, and calculating the internal thermal stress value of the single crystal in real time using a stress calculation model; when the thermal stress approaches a preset threshold, the system automatically reduces the heating and cooling rate to actively relieve pressure. This invention, through a virtual stress monitoring system and a high thermal conductivity buffer layer, solves the technical problems of localized heat conduction lag and macroscopic stress runaway in large-size crystals, reducing the internal stress of the annealed crystal to below 50 MPa, significantly shortening the annealing cycle and significantly improving the wafer yield.

The utility model discloses an artificial diamond impurity removal device which comprises a stirring box and an impurity removal box, a stirring mechanism is arranged in the stirring box, a magnetic net is arranged below the stirring mechanism, the impurity removal box is installed at the bottom of the stirring box, and an ultrasonic transducer used for cleaning artificial diamond is arranged on the outer side of the impurity removal box. Two filter screens are arranged in the impurity removal box, one end of each filter screen is hinged to the inner wall of the impurity removal box, the two filter screens are opened towards the bottom of the impurity removal box, hydraulic telescopic rods are connected between the bottom surfaces of the filter screens and the inner wall of the impurity removal box, and a feeding port is formed in the side face of the top of the stirring box. A water injection port is formed in the top surface of the stirring box, and a discharge port is formed in the bottom of the impurity removal box. Through multiple impurity removal modes of stirring, magnetic separation and ultrasonic cleaning, various impurities in the artificial diamond can be efficiently removed, the product purity is improved, and the quality and performance of the diamond are guaranteed.

The utility model relates to the technical field of grinding machines for synthetic diamond blocks, in particular to a grinding machine for synthetic diamond blocks, which is provided with a clamping device for clamping the synthetic blocks during grinding to improve grinding quality, and is provided with a first conveying device and a second conveying device for automatically clamping and conveying the synthetic blocks to improve grinding efficiency. A worker only needs to place the synthetic block on the conveying device I, so that the usability of the machine is improved; comprising a body; the polishing machine further comprises a first conveying device, a second conveying device, a clamping device, a polishing device and a separating device. The first conveying device, the second conveying device, the clamping device, the polishing device and the separating device are all installed on the machine body. The machine body provides support, the first conveying device conveys the synthetic blocks, the second conveying device clamps and conveys the synthetic blocks, the clamping device clamps the synthetic blocks during grinding, the grinding device grinds the synthetic blocks, and the separating device separates the synthetic blocks.

The utility model relates to the technical field of artificial diamond storage, and discloses an artificial diamond storage device with a transfer function, which comprises a bearing vehicle body and a storage box, universal wheels are respectively arranged at four corners of the lower surface of the bearing vehicle body, and bolts are in threaded connection with the upper surface of the bearing vehicle body. According to the artificial diamond storage device with the transfer function, an adjusting rod slides in a telescopic sleeve shell, and a limiting plate fixedly connected with the inner side of the adjusting rod makes contact with the top of a second placement cabinet in the sliding process, so that downward pressing operation is formed on the second placement cabinet and the first placement cabinet; a second placing cabinet is installed in a spiral groove where a telescopic sleeve shell and an adjusting rod coincide, then downward pressing limiting operation on the two sides of the second placing cabinet and the first placing cabinet can be formed, in the whole operation process, the overall stability in the transferring process can be guaranteed, the falling phenomenon caused by jolting is avoided, disassembly and carrying can be conducted according to requirements, and the practicability is high. The operation method is simple and high in practicability.

The application discloses a single crystal synthetic diamond material by chemical vapor deposition. The material comprises a total nitrogen concentration of at least 3 ppm as measured by secondary ion mass spectrometry (SIMS); and a low optical birefringence such that, in a sample of the single crystal CVD diamond material having an area of at least 1.3 mm * 1.3 mm and using pixel dimensions of an area in the range of 1 * 1 [mu] m2 to 20 * 20 [mu] m2, the maximum value of [Delta] n [average] does not exceed 1.5 * 10-4, and the maximum value of [Delta] n [average] does not exceed 1.5 * 10-4, in a sample of the single crystal CVD diamond material having an area of at least 1.3 mm * 1.3 mm. Wherein [Delta] n [average] is an average value averaging the difference in refractive index over the sample thickness for light polarized parallel to the slow and fast axes. Methods of making the materials are also disclosed.

The utility model discloses an artificial diamond purifying and sorting machine, and relates to the technical field of mineral sorting. The artificial diamond purifying and sorting machine comprises a box body, a discharging port is formed in the outer surface of the box body, a water tank is fixedly connected to the upper surface of the box body, a water pump is fixedly connected to the outer surface of the water tank, a water conveying pipe is fixedly connected to the output end of the water pump, a water outlet is formed in the end, away from the water pump, of the water conveying pipe, and a cleaning groove is formed in the other side of the water outlet. A supporting plate is fixedly connected to the inner wall of the cleaning groove, a cleaning device is arranged in the cleaning groove, a transmission rod rotates to drive fan blades to rotate, water flow is stirred through rotation of the fan blades, when the water flow is stirred, high-quality impurities are separated to the lower surface of a second baffle through inertia centrifugal force, and separated and cleaned liquid flows back to a water tank through a water conveying tank. And finally, waste impurities are discharged through a discharge port, so that the product is more environment-friendly while the practicability is improved, redundant discharge is reduced, and the problem that waste water is not easy to clean is solved.