176results about "Ultra-high pressure processes" patented technology

The invention relates to the technical field of synthesis equipment of superhard materials, in particular to energy-saving type diamond production equipment and a production technology.The energy-saving type diamond production equipment comprises a machine body, a holding-up hammer, a transmission rod, a clamping piece and an adjusting assembly, the machine body is fixedly arranged, a cavity is formed in the machine body, pyrophyllite is located in the center of the cavity, and the holding-up hammer is arranged in the cavity; the holding-up hammers are arranged on the machine body, the extension lines of the transmission rods penetrate through the center and one vertex angle of the pyrophyllite, and the transmission rods slide and can intersect at the center position of the pyrophyllite; the clamping piece is arranged on the transmission rod and used for clamping the vertex angle, corresponding to the transmission rod, of the pyrophyllite. The adjusting assembly is used for guiding each holding-up hammer to slide towards the center position of the cavity. The pyrophyllite can be fixed at the central position in the cavity through the cooperative arrangement of the transmission rod and the clamping piece, so that the phenomenon of pyrophyllite position deviation caused by asynchronous contact between the six holding-up hammers and the pyrophyllite is improved, and the degree of uneven stress of a carbon source is relieved.

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 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.

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.

In order to overcome the problems of high recovery price, high energy consumption and low utilization rate of the existing kettle residue for the production of ethylene glycol by ethylene carbonate alcoholysis method, the application provides a kettle residue recovery method and device for the production of ethylene glycol by ethylene carbonate alcoholysis method, and the application provides a kettle residue recovery method for the production of ethylene glycol by ethylene carbonate, which comprises the following steps: under the conditions of temperature 150-250 DEG C and pressure 0.6-2 MPa, the ethylene glycol in the kettle residue produced by the preparation of ethylene glycol by ethylene carbonate alcoholysis method is converted into diethylene glycol under the catalysis of alkali metal salt catalyst, and after the reaction is completed, the kettle residue is a mixture of ethylene glycol, diethylene glycol, triethylene glycol and salt, the mixture is purified, and ethylene glycol and diethylene glycol are recovered; the economic benefit is improved, the rectification separation operation is simplified, the equipment investment and the overall energy consumption are reduced, and the utilization rate of ethylene glycol kettle residue is improved.

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.

This invention belongs to the field of superhard material synthesis technology, specifically disclosing a high-temperature, high-pressure preparation method for nano-polycrystalline diamond with synergistic mechanical and thermal properties. The method includes the following steps: precursor preparation: pre-pressing the precursor in a cemented carbide mold; octahedral assembly; wrapping the pre-pressed sample with platinum foil and placing it at the center of the octahedron; high-temperature, high-pressure sintering; stopping heating after heat preservation, allowing it to cool naturally to 23-25°C, then depressurizing, removing the octahedral assembly and the platinum foil wrapping, thus obtaining the synergistically enhanced nano-polycrystalline diamond. This invention employs the above-mentioned high-temperature, high-pressure preparation method for nano-polycrystalline diamond with synergistic mechanical and thermal properties. By combining nanodiamond powder with graphene, the sample assembly is optimized, and nano-polycrystalline diamond samples with excellent mechanical properties and significantly improved thermal conductivity are synthesized under relatively mild temperature and pressure conditions.

The utility model belongs to the technical field of cubic presses, and particularly relates to a cubic press holding-up hammer correcting block which comprises a correcting block body, a connecting block is installed on the outer wall of the correcting block body, an adjusting rod is connected to the connecting block in a threaded mode, a center plate is fixedly connected to one end of the adjusting rod, a rotating ring is fixedly connected to the outer wall of the center plate, and the rotating ring is fixedly connected to the outer wall of the center plate. A supporting plate is rotationally connected to the outer wall of the rotating ring, a connecting groove matched with the rotating ring is formed in the supporting plate, a receding groove is formed in the supporting plate, and a supporting frame is connected to the inner wall of the receding groove in a clamped mode; the position of the supporting plate can be adjusted through an adjusting rod, a connecting groove and a rotating ring, so that the device is adjusted according to the position of the jacking machine after jacking, the jacking machine is corrected, and an assembly capable of correcting the position of the jacking end after contraction is formed in cooperation with a receding groove, a threaded rod and a supporting frame; and the device can be used for conveniently correcting the jacking and retracting positions of the jacking end of the cubic press.

The invention provides a blank molding assembly block of diamond large single crystals and a plastic growth method, and belongs to the technical field of superhard material synthesis. The blank molding assembly block comprises a mutually-embedded metal catalyst layer formed by mutually embedding a plurality of prismatic table metal catalyst structures, the whole mutually-embedded metal catalyst layer is in a prismatic table shape, one of the upper end face and the lower end face of each prismatic table metal catalyst structure is in contact with the high-purity graphite carbon source layer, and the other one of the upper end face and the lower end face of each prismatic table metal catalyst structure is in contact with the seed crystal; the adjacent prismatic table metal catalyst structures are separated by an insulating layer, and the insulating layer is a Ca coating or a BN coating. A mutually-embedded prismatic-table-shaped metal catalyst structure with an axial temperature gradient and a carbon diffusion channel is constructed in a blank assembly block, diamond is induced to grow in a preset direction in an HPHT environment, directional shaping growth of the diamond is achieved under the condition that the process complexity is not improved, and the quality of the diamond is improved. The crystal morphology controllability, the catalytic agent utilization efficiency and the final drilling rate are remarkably improved, and the single-cavity yield is increased.

The invention relates to the technical field of hard alloy for synthesis of superhard materials, and particularly discloses a hard alloy holding-up hammer for synthesis of high-purity large single crystal diamond and a preparation method of the hard alloy holding-up hammer. The holding-up hammer material is composed of the following components in percentage by weight: 80%-88% of WC, 4%-8% of Co, 2%-5% of TaC, 3%-7% of TiC and 0.5%-2% of Cr3C. Wherein WC serves as a hard phase, Co serves as a binding phase, TaC inhibits grain growth, TiC nanoparticles are dispersed and distributed to form a pinning effect, and Cr3C2 improves the wettability of the binding phase and improves the oxidation resistance. The preparation method comprises the steps of raw material selection and ball-milling mixing, vacuum drying and sieving, cold pressing and cold isostatic pressing forming, gradient sintering and grinding and subzero treatment.

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.

This invention relates to the field of high-performance ceramic material preparation technology, specifically an ultra-high pressure discharge plasma sintering system, comprising a six-sided press body, a high-power DC pulse power supply, and a high-pressure synthesis assembly block. The six-sided press body has a frame providing ultra-high pressure and a hydraulic drive system. Its six carbide hammers together form a cubic space for placing the high-pressure synthesis assembly block containing the sample. The two poles of the high-power DC pulse power supply are respectively connected to two upper and lower large pads through two conductive copper strips. The ends of the two large pads are fitted with steel rings, and the ends of the steel rings are embedded with carbide hammers. This ultra-high pressure discharge plasma sintering system achieves rapid and uniform bulk heating of the sample. The synergistic effect of the two systems enables the densification sintering preparation of ultra-hard ceramics at temperatures far lower than those of traditional high-temperature and high-pressure methods in a short time.

The present application relates to the technical field of auxiliary structure of cubic press, in particular to a temperature control device of cubic press, which is applied to cubic press, and the cubic press comprises six top hammers, each of which is provided with small and large pads, and a steel ring is detachably sleeved on the top hammer, the small and large pads and the top hammer; the temperature control device of cubic press comprises a cooling liquid pipe, each top hammer is provided with a cooling liquid pipe, both ends of the cooling liquid pipe pass through the small pad, and the cooling liquid pipe is detachably arranged on the steel ring, the cooling liquid pipe is configured to receive external cold liquid, thereby breaking through the heat transfer bottleneck of traditional indirect cooling of steel ring, so that the heat of the top hammer can be directly radiated through the cooling liquid pipe, while significantly reducing the interface thermal resistance and material thermal conductivity loss in the heat conduction path, the temperature stability of the superhard material synthesis process is ensured, and the synthesis efficiency and product quality are improved.

The present application relates to the technical field of sealing of superhard material synthesis, and particularly relates to a main cylinder sealing structure of a cubic press, which comprises a main shell, a sealing cylinder coaxially fixed in the main shell, a piston in sliding connection with the sealing cylinder, an oil pressure system for driving the piston to slide along the central axis direction of the sealing cylinder, a sealing assembly and a impurity removing assembly. The impurity removing assembly comprises a first impurity removing unit and a second impurity removing unit. The oil pressure system has a first stroke and a second stroke when driving the piston to slide. When the piston is in the first stroke, the first impurity removing unit is used to clean impurities through a negative pressure effect. When the piston is in the second stroke, the second impurity removing unit is used to clean impurities through a negative pressure effect. The sealing assembly is used to prevent the hydraulic oil in the first impurity removing unit and the second impurity removing unit from exchanging with each other. Thus, the impurities are removed, and the sealing cylinder is effectively prevented from being damaged by the impurities.

The invention discloses a cylinder-beam integrated prestress press and a prestress loading method, the cylinder-beam integrated prestress press comprises a prestress pulling plate connected between a cylinder beam and a cylinder-free beam, and a prestress pressing plate is further arranged between the cylinder beam and the cylinder-free beam; the prestress pressing plate comprises a prestress fixing plate making contact with the cylinder beam and a prestress adjusting plate making contact with the cylinder-free beam, the prestress fixing plate and the prestress adjusting plate are attached to each other through a wedge-shaped face, and the relative position of the prestress fixing plate and the prestress adjusting plate is adjusted through a positioning component. Through the structure and method innovation of cylinder-beam integration, wedge-shaped adjustment and accurate pre-tightening, all-around upgrading of the performance of the press is achieved, the comprehensive requirements of electrostatic chuck lamination and related industries for large tonnage (500-5000 kN), high rigidity (2000 kN load deformation is smaller than or equal to 2 microns), high precision (parallelism error is smaller than or equal to 5 microns) and small occupied area (the size is reduced by 30%) are completely met, and the application range is wide. The technical bottlenecks that existing equipment is insufficient in rigidity, limited in adjustment, inconvenient to operate, difficult to popularize and the like are solved.

The utility model discloses a holding-up hammer protection device of a cubic press. The holding-up hammer protection device comprises a protection mechanism and two connecting mechanisms, one ends of the two connecting mechanisms fixedly sleeve the heating hammer and the non-heating hammer respectively, and the other ends of the two connecting mechanisms are electrically connected with the protection mechanism respectively; and when the heating hammer and the non-heating hammer are in a connected state, the protection mechanism cuts off the power supply circuit of the jacking machine and gives an alarm to the outside. The anvil protection device has the advantage of good protection effect, and solves the problems that in the use process of an existing anvil protection device of the cubic press, whether a heating hammer is in contact with a non-heating hammer is inconvenient to detect, the protection effect of the anvil is reduced, and the anvil is prone to being broken and damaged.

The invention provides a wurtzite boron nitride / diamond composite material and a preparation method and application thereof, the composite material is composed of two phases of wurtzite boron nitride and diamond, and has a stacked sandwich microstructure, the sandwich microstructure comprises at least one first wurtzite boron nitride layer and at least one second wurtzite boron nitride layer, wherein the first wurtzite boron nitride layer is formed by wurtzite boron nitride; at least one second wurtzite boron nitride layer composed of wurtzite boron nitride; the composite material comprises a first wurtzite boron nitride layer, a second wurtzite boron nitride layer and a diamond layer, the diamond layer is arranged between the first wurtzite boron nitride layer and the second wurtzite boron nitride layer and is made of diamond, wurtzite boron nitride is a metastable phase stably existing under normal pressure, and the Vickers hardness of the composite material is larger than 50 GPa. The novel wurtzite boron nitride / diamond composite material disclosed by the invention has high hardness, high toughness and high thermal stability, and the preparation method disclosed by the invention is low in initial raw material price and simple in preparation process.

The utility model relates to the technical field of diamond hydraulic machines, in particular to a conical bottom structure hinge beam of a cubic hydraulic machine, which comprises a hinge beam and a conical seat, the conical seat comprises a conical component, a plurality of buffer components and an anti-drop component, the anti-drop component is fixedly connected with the conical component, each buffer component is fixedly connected with the conical component, and the conical component is fixedly connected with the conical seat. The conical assembly is fixedly connected with the hinge beam, a plurality of anti-disengagement teeth in the anti-disengagement assembly can play a clamping role in a peripheral side groove of the hydraulic machine, the situation that the hydraulic machine slips and rotates in the using process is avoided, the designed structure is simple, production is convenient, the situation that steering slipping is likely to happen in the placing and using process of the hydraulic machine is solved, and the service life of the hydraulic machine is prolonged. And the supporting and stabilizing effects on the hydraulic machine are influenced.

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.

This invention relates to the field of superhard material synthesis equipment, specifically to a six-sided press for synthetic diamond, comprising a top hammer assembly with six sets, each set including a first locking structure. The first locking structure can apply a circumferentially uniformly distributed force to the positioning ring, thereby locking and fixing the positioning ring and the large pad in a coaxial state, ensuring the stability and coaxial accuracy of the connection between the positioning ring and the large pad, and effectively avoiding positioning offset or locking failure caused by uneven force.

The application discloses a preparation method of a synthesis column for polycrystalline diamond synthesis, which adopts a wet mixing method of a composite mixing medium to improve mixing efficiency and mixing uniformity, reduces mixing time from 15 hours to 4 hours or below, and saves time cost; meanwhile, the supercritical CO2 extraction drying and atmosphere furnace reduction technology are adopted for the first time, the water removal rate is increased by 5-8% compared with a conventional drying method, the oxygen between the gaps of the particles is further replaced, the oxidation layer of the catalyst surface layer is further treated, the influence of the oxidation layer of the catalyst surface on the nucleation and growth of the diamond is reduced, and the yield of the polycrystalline diamond is further increased.

The invention discloses a method for simultaneously preparing graphene and two-dimensional diamond, which comprises the following steps: adding single-crystal crystalline flake graphite powder and a high polymer into a ball-milling tank, ball-milling and uniformly mixing, tabletting the obtained mixed powder, and pressing in a cubic press to obtain the graphene and the two-dimensional diamond, according to the method, the stable graphene and the two-dimensional diamond which are large in size are obtained, the prepared graphene and the prepared two-dimensional diamond do not contain impurities and are high in purity, and the method has important significance on development of research on physical and chemical properties of the graphene and the two-dimensional diamond and implementation of application of the graphene and the two-dimensional diamond.

SOLUTION: There are provided a double-tube connection structure for detonation synthesis, a detonation synthesis device, and an application thereof. The double-tube connection structure for detonation synthesis includes: a drive tube 4; a sample tube 2; a fixed assembly; and an end plug 7 provided at a port of the sample tube. The drive tube is sleeved outside the sample tube, and cavities 3 are provided between the drive tube and the sample tube and between the drive tube and the end plug. The fixed assembly is provided on both ends of both of the drive tube and the sample tube. After detonation, a detonation wave is transferred from top to bottom. Under the action of the detonation wave, the drive tube performs concentric sliding motion toward the sample tube, and covers outside a top end plug of the sample tube, the sample tube, and a bottom end plug of the sample tube. The detonation synthesis device comprises the double-tube connection structure for detonation synthesis.EFFECT: With a device, a graphite sample can be effectively converted into a high-purity polycrystalline diamond. The high-purity polycrystalline diamond obtained by conversion can be completely recovered.SELECTED DRAWING: Figure 2

In particular, the objective is to provide a diamond sintered body that can be applied to the processing of all materials, including iron, does not accelerate the graphitization phase transition by binders, and can be manufactured under the same pressure and temperature conditions as currently common cobalt-based diamond sintered bodies (PCDs). [Solution] A method for producing a w-BN-based boron nitride bonded composite diamond sintered body, characterized by densely mixing diamond particles and wurtzite-type boron nitride (w-BN) powder, distributing the w-BN between the diamond particles to form a binary starting composition, and simultaneously subjecting the starting composition to a pressure of 4.5 GPa or more and less than 8 GPa and a temperature of 1200°C or more and less than 2000°C to bond adjacent diamond particles together via the inter-particle w-BN phase present between the particles, thereby integrating them.

This invention relates to the field of diamond, and more specifically to a six-sided pressing device for ultra-high pressure synthesis of diamond. The device includes a ring frame with four fixed seats, each slidably connected to a pressure column. Vertical pressure seats are fixed to opposite ends of the four pressure columns. Each vertical pressure seat has a pressing surface on both sides, and the four vertical pressure seats are pressed together through these pressing surfaces to form a cubic space. A flat pressure seat is provided on the top and bottom sides of the cubic space, allowing it to be pressed into the cubic space. Guide slopes are provided on the top and bottom sides of each vertical pressure seat. This allows for six-sided pressing.

The method comprises the following steps: placing monocrystal crystalline flake graphite powder in powder ALD equipment for tantalum oxide deposition to obtain monocrystal crystalline flake graphite powder subjected to ALD treatment, mixing the monocrystal crystalline flake graphite powder with a high polymer, placing the mixture in a ball milling tank, and mechanically and uniformly mixing to obtain a mixture; preparing the mixture into a tableting sample by using tableting equipment, assembling the tableting sample into a synthesis block of a cubic press, and pressing to obtain graphene and two-dimensional diamond; according to the method, the stable large-size two-dimensional diamond and graphene can be obtained, the method has the advantages of being simple in preparation process, wide in parameter adjustable range, not limited to the substrate technology and the like, and the method has important significance on development of research on the two-dimensional diamond and graphene and implementation of application of the two-dimensional diamond and graphene.

The application discloses a top hammer pressing and distributing device of a diamond synthesis equipment and relates to the technical field of the diamond synthesis equipment. The piston cylinder of the pressing mechanism drives the top hammer to move and touch the rack, and the top hammer is pressed into the sheath. After the pressing of the top hammer is completed, the cleaning brush of the cleaning mechanism is used to clean the impurities on the top hammer and the sheath, so that the normal work of the top hammer and the sheath is not affected by the impurities. The rotating rod of the cleaning brush can move freely and press the cleaning brush on the top hammer and the sheath under the action of the spring, so that the cleaning effect of the cleaning brush is improved. After the cleaning of the cleaning brush is completed, the cleaning brush moves on the arc-shaped rod one and collides with the arc-shaped rod two under the action of the spring elasticity, so that the impurities remaining on the cleaning brush can be shaken off, thereby improving the cleaning effect of the cleaning brush in the next time.

The present invention provides an explosive composition containing at least one explosive and at least one heteroatom compound, the heteroatom compound including at least one type of heteroatom selected from the group consisting of B, P, Si, S, Cr, Sn, Al, Ge, Li, Na, K, Cs, Mg, Ca, Sr, Ba, Ti, Zr, V, Nb, Ta, Mo, W, Mn, Ni, Cu, Ag, Cd, Hg, Ga, In, Tl, As, Sb, Bi, Se, Te, Co, Xe, F, Y, and lanthanoids.