159 results about "Superhard material" 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 invention relates to the technical field of superhard material machining, in particular to a cubic press and a cubic boron nitride cutter machining method thereof.The cubic press comprises a cubic press body, and a centering mechanism and a bottom cleaning mechanism are arranged at the hydraulic end of a lower pressing mechanism; a discharging mechanism is arranged on the upper surface of the fixed support located on the lower jacking mechanism and arranged on one side of the bottom cleaning mechanism. The method for machining the cubic boron nitride cutter comprises the following steps of raw material mixing, die filling, feeding, high-temperature and high-pressure sintering, discharging, material cutting, cutter welding and the like. A pyrophyllite mold can be located in the center of the hydraulic end through the centering mechanism, the qualified rate of products is increased, pyrophyllite chippings are prevented from adhering to the end face of the hydraulic end and the surface of an abutting sealing top plate through a bottom sweeping mechanism and sweeping brushes on the discharging mechanism, automatic discharging is adopted by the discharging mechanism, pedal installation and manual operation are not needed, and the production efficiency is improved. And the use safety of the cubic press is greatly improved.

The application relates to the technical field of superhard materials, and discloses a non-magnetic polycrystalline diamond compact as well as a preparation method and application thereof. The non-magnetic polycrystalline diamond compact comprises a nickel-based hard alloy base and a polycrystalline diamond layer combined on the nickel-based hard alloy base; wherein the nickel-based hard alloy base comprises nickel and tungsten carbide, and the polycrystalline diamond layer comprises nickel and diamond micro powder. The non-magnetic polycrystalline diamond compact of the application uses a nickel-based hard alloy base, and the polycrystalline diamond layer uses nickel as a bonding phase, so that the magnetism of the polycrystalline diamond compact is effectively reduced, and the application requirement of a non-magnetic bearing material can be met.

The invention relates to the field of intelligent welding processes and control, and discloses a welding method for a superhard material sealing body multilayer structure. Comprising the steps of obtaining multilayer structure data, and generating a three-dimensional digital model; energy input parameters are optimized according to the heat affected zone and the stress concentration zone, and an initial energy tuning parameter set is generated; according to the initial energy tuning parameter set, temperature field data and stress field data in the welding process are collected, and the dynamic heat affected zone change trend is obtained; according to the change trend of the dynamic heat affected zone, adjusting energy input and a scanning path, and generating a corrected energy tuning parameter; controlling depth distribution of energy in the multilayer structure according to the corrected energy tuning parameters to obtain fusion depth and heat affected zone distribution; energy input and scanning speed are adjusted according to the fusion depth and the heat affected zone distribution, and an energy input parameter set is generated. The precision of energy control in the welding process is improved.

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.

A method of leaching an element may include exposing an electrode and at least a portion of an element body comprising at least one of a superabrasive or a superhard material to a processing solution; while the electrode and the at least a portion of the element body are exposed to the processing solution in an electrochemical leaching process, applying an electrical potential between the electrode and the element body; and preferentially removing the metallic material from a portion of the element body in the electrochemical leaching process.

The utility model relates to a superhard material guide rail machining device which comprises a lathe bed. The working table is arranged above the machine body; the two ends of the cross beam are arranged on the workbench through stand columns; the X-axis linear motor module is arranged on the cross beam; the Z-axis linear module is arranged on the X-axis linear motor module; the spindle box is arranged on the Z-axis linear module, an electric spindle is arranged in the spindle box, and a grinding tool or a polishing tool is installed on the electric spindle; the Y-axis linear motor module is arranged on the workbench; and the workpiece carrying plate is arranged above the Y-axis linear motor module. Through multi-axis linkage of the X-axis linear motor module, the Y-axis linear motor module and the Z-axis linear motor module, the long guide rail is pressurized and polished through a small tool, the grinding amount is controlled through the dwell time and the polishing pressure, and high-precision machining of the long guide rail is achieved.

The invention relates to the technical field of superhard materials, and particularly discloses a polycrystalline diamond compact and a preparation method and application thereof.The preparation method of the polycrystalline diamond compact comprises the following steps that WC-Co alloy powder is sintered to obtain a hard alloy matrix; uniformly mixing nano diamond powder, micron diamond powder and cubic boron nitride, adding a reinforcing agent and a binding agent, and uniformly mixing to obtain a polycrystalline diamond layer mixture; the reinforcing agent is a nitrogen-boron doped graphene bonded amino carbon nanotube; a gradient transition layer raw material and a polycrystalline diamond mixture are uniformly spread on the surface of the hard alloy matrix in sequence, and then a composite blank is obtained through mold pressing; and sintering the composite blank to obtain the polycrystalline diamond compact. Graphene and carbon nanotubes are compounded to form a reinforcing agent with a three-dimensional network structure, so that the strength and wear resistance of the material are improved, and the service life of the material under harsh working conditions is prolonged.

The invention discloses a wafer precision grinding method based on laser subsurface modification softening, and belongs to the technical field of semiconductor manufacturing. The method is used for carrying out final damage layer removal and surface finish machining on the hard and brittle wafers (such as silicon carbide and diamond) subjected to preliminary mechanical polishing. The method comprises the following steps: (1) detecting the depth of a damaged layer on the subsurface of a wafer; (2) focusing ultrafast laser on the subsurface of the wafer, scanning to form a continuous and compact softened modified layer, controlling the modified layer to extend upwards in the vertical direction, so that the modified layer covers most of the volume of the material to be removed, and only retaining a micron or submicron original hard thin layer on the top layer of the wafer; (3) carrying out nondestructive testing on the modified layer; and (4) an ultra-precision grinding process (such as CMP or PAP) is adopted, the supporting weakening effect of the modified layer on the top hard thin layer and the characteristic that the modified layer is easy to remove are utilized, and all the to-be-machined allowances are rapidly removed at a time. According to the method, on the premise that the high-quality surface is not damaged, the finish machining efficiency of the superhard material is remarkably improved through the mechanism of internal softening and top layer collapse removal.

This application relates to a polycrystalline diamond composite substrate, belonging to the technical field of superhard material composites. It includes a cylinder with one end serving as a bonding surface; a frustum located at one end of the bonding surface, comprising a truncated cone coaxially transitioning onto the cylinder and a frustum coaxially connected to the truncated cone; and a raised structure disposed on the frustum, comprising multiple sets of coaxially arranged raised units, each set of raised units being evenly distributed in a ring around the center of the bonding surface, with grooves formed between adjacent raised units, the grooves being concentric with the bonding surface. This application allows external forces applied to the composite to be more evenly distributed across different parts of the substrate, avoiding localized stress concentration. The raised structure increases the contact area between the substrate and the diamond layer, significantly enhancing the adhesion between them. During drilling, the diamond layer adheres more firmly to the substrate, reducing the risk of premature detachment of the diamond layer due to external forces.

The invention discloses a composite laser cutting device which comprises a first light source, a second light source, a first reflecting mirror, a spectroscope, a focusing mirror, a first energy distribution adjusting assembly and a second energy distribution adjusting assembly, and further discloses a composite laser cutting method which comprises the following steps that a light beam is emitted, and energy distribution of the composite light beam is controlled. The method has the beneficial effects that distribution control and application of multi-level energy are achieved, and the efficiency and quality of composite beam laser cutting can be rapidly improved by controlling the energy density of the whole body and the center. The laser cutting machine can be well applied to laser cutting, is particularly suitable for cutting thick plates and composite plates, can cut transparent materials with high efficiency, and can overcome the technical problem that a laser cutting machine in the prior art is difficult to effectively cut the transparent materials and superhard materials.

The invention provides intelligent self-adaptive precision grinding equipment and method for a superhard material. The intelligent self-adaptive precision grinding equipment comprises a frame body, a mortar rotating mechanism arranged on the frame body and used for driving a mortar to rotate, and a self-adaptive grinding mechanism used for driving a grinding rod to be rotationally matched with the mortar; the self-adaptive grinding mechanism comprises a flexible grinding rod assembly connected with the grinding rod and a moving module used for driving the flexible grinding rod assembly to move. The flexible grinding rod assembly is connected with the moving module through the three-dimensional torque feedback assembly. The three-dimensional torque feedback assembly feeds back the torque value in real time, the position of the sliding block, namely the moving end, of the moving module is rapidly adjusted, and then the three-dimensional torque feedback assembly and the flexible grinding rod assembly are driven to move; in addition, the flexible grinding rod assembly eliminates the instant change of grinding force caused by the irregularity of part of grinding rods and grinding bowls and different powder accumulation thicknesses, so that the pressure value of the grinding rods for pressing the inner wall is kept within a certain range, and the self-adaptive precise grinding is ensured.

The invention belongs to the technical field of superhard material tool manufacturing, and particularly relates to a functionally gradient enhanced diamond thin-wall drill and a preparation method and application thereof. The functionally gradient enhanced diamond thin-wall drill comprises a steel base body, the outer end of the steel base body is a drilling part of a cylindrical structure, and inclined grooves and drilling units are formed in the periphery of the drilling part at equal intervals; an anti-friction heat-conducting coating is cladded on the wall surface of the inclined groove; the drilling unit comprises a functional gradient nano-reinforced brazing filler metal layer and diamond abrasive particles brazed on the surface of the functional gradient nano-reinforced brazing filler metal layer through laser; the functional gradient nano-reinforced brazing filler metal layer comprises a transition layer, a reinforcing layer and a bonding layer which are sequentially arranged in the direction from the steel base body to the diamond abrasive particles. According to the diamond thin-wall drill, by designing the functional gradient nanometer enhanced brazing filler metal layer and the antifriction heat conduction coating and adopting the laser welding technology, multi-performance collaborative optimization of impact resistance, high abrasion resistance, strong heat dissipation and low friction of the diamond thin-wall drill can be achieved, and the service life of the diamond thin-wall drill is remarkably prolonged.

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 discloses a diamond drilling device which comprises a machine box, a machine frame connected to the machine box, a lifting base connected to the machine frame through a lifting mechanism, a pull rod connected to the bottom face of the lifting base, a bearing plate connected to the lower end of the pull rod, a through hole formed in the center of the bearing plate, and a first sleeve connected to the bottom face of the bearing plate. The periphery of the first sleeve is rotatably connected with a second sleeve, the lower end of the second sleeve is connected with a pre-drill bit, and the bottom surface of the bearing plate is provided with a first driving mechanism for driving the second sleeve to rotate; the center of the bottom face of the lifting base is connected with a first air cylinder, the telescopic end of the first air cylinder is connected with a telescopic rod through a rotary connector, the top face of the bearing plate is rotationally connected with a third sleeve, and the telescopic rod is in spline connection in the third sleeve. And a second driving mechanism for driving the third sleeve to rotate is arranged on the top surface of the bearing plate. Through pre-drilling, rapid drilling, rough machining and stress release are achieved, and the problem of edge breakage of superhard material drilling is solved.

This application relates to the field of superhard materials technology, specifically disclosing a method for preparing polycrystalline diamond composite sheets and their application in drill bits. The method for preparing the polycrystalline diamond composite sheet includes the following steps: S1, molding and sintering WC powder and Co to obtain a cemented carbide substrate; S2, grafting multi-walled carbon nanotubes with free radicals to obtain modified multi-walled carbon nanotubes; S3, surface-treating diamond micropowder to obtain modified diamond micropowder; S4, processing the modified diamond micropowder, modified multi-walled carbon nanotubes, N-rGO, Ti powder, etc., to obtain a powder, which is then combined with the cemented carbide substrate to obtain the polycrystalline diamond composite sheet. This application uses modified diamond and composite reinforcing phases to solve the problems of weak interfaces and thermal stress concentration within the polycrystalline diamond composite sheet, while simultaneously improving structural integrity and impact resistance at high temperatures.

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.

A cutting element may include a substrate; and an ultrahard layer on the substrate, the substrate and the ultrahard layer defining a non-planar working surface of the cutting element such that the ultrahard layer forms a cutting portion and the substrate is at least laterally adjacent to the ultrahard layer. Another cutting element includes a pointed region having a side surface extending from the pointed region outer perimeter to a peak. An ultrahard material body forms a portion of the pointed region including the peak, and a base region extends a depth from the pointed region outer perimeter. The ultrahard material body has a height to width aspect ratio with the height and width measured between two points of the body having the greatest distance apart along a dimension parallel with a longitudinal axis (i.e., height) along a dimension perpendicular to the longitudinal axis (i.e., width).

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.

A milling cutter comprising: a tool shank (12) having a longitudinal axis of rotation; and a tool head (16) attached to one end of the tool shank, the tool head comprising first, second and third tiers (18a, 18b, 18c) extending around an outer surface of the tool head; wherein the tiers are axially displaced from each other along the longitudinal axis; wherein the first tier of the tool head comprises a plurality of axially extending first cutting surfaces, each first cutting surface having a first profile; the second tier of the tool head comprises a plurality of axially extending second cutting surfaces, each second cutting surface having a second profile; and the third tier of the tool head comprises a plurality of axially extending third cutting surfaces, each third cutting surface having a third profile; wherein the first tier is closer to the tool shank than the second tier; and wherein the third tier is further from the tool shank than the first tier and the second tier; wherein, when the first, second and third profiles are superimposed, the first profile nests within the second profile, and the second profile nests within the third profile; wherein the first profile differs from the second profile, and wherein the third profile differs from the first profile and the second profile; and wherein the first, second and third cutting surfaces comprise superhard material.

The present disclosure relates to a friction stir welding tool assembly (10) comprising a base (12) having a base end (12a), the base end (12a) comprising a convex portion, and a tip end (14) having a tip end (14a), the tip end (14a) comprising a concave portion, the tip end further comprising a stir pin (20), the stir pin (20) being located distally relative to the tip end (14a). The tip end (14) is formed of a superhard material, and the base end (12a) is joined to the tip end (14a) at corresponding convex portions and concave portions.

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 application relates to the field of boring equipment, and discloses a novel precision boring machining equipment and method for an axle of superhard material, which comprises a base, a jig mechanism and two groups of boring mechanisms, the two groups of boring mechanisms and the jig mechanism are arranged on the upside of the base, the boring mechanism comprises a machine box, a sliding assembly, a rotating assembly, a tool holder assembly and a power assembly, the suction mechanism comprises a frame, a stand and two groups of gathering assemblies, the stand is vertically and fixedly installed at the top of the middle part of the jig mechanism, the frame is vertically and fixedly installed at the top of the stand, the two groups of gathering assemblies are symmetrically and vertically arranged on the two sides of the frame, the gathering assembly comprises a plate body, an electromagnet device and a cleaning part, the plate body is vertically and fixedly installed in the frame, the electromagnet device is vertically and fixedly embedded in the outside of the plate body, the cleaning part is arranged in the frame, and the output end of the suction device is communicated with the two groups of boring mechanisms through two groups of pipeline assemblies. The application solves the problem that metal chips lack efficient and timely cleaning means, thereby affecting the precision of holes.

This invention relates to the fields of laser surface engineering and superhard material coating technology, specifically to a wear-resistant workpiece with a diamond composite coating and its preparation method. The wear-resistant workpiece includes a substrate with multiple pits, at least some of which are embedded with first diamond particles. A first brazing filler metal is disposed on the substrate, partially filling the pits and coating the first diamond particles. A metal-based diamond composite coating is disposed on the first brazing filler metal, comprising a second brazing filler metal and second diamond particles. First, a pit array is etched on the substrate using a femtosecond laser to fill the pits with the first diamond particles. A metal binder is then coated inside the pits and on the substrate surface. Then, a cladding layer is formed by coaxial powder-feeding laser cladding, resulting in a two-layer composite wear-resistant structure with a substrate embedding layer and a surface cladding layer. This effectively increases the thickness of the wear-resistant layer, significantly improves the wear resistance of the workpiece, and extends its service life.

The invention relates to a convenient-to-grind polycrystalline superhard material green body and a preparation method thereof, the convenient-to-grind polycrystalline superhard material green body comprises a polycrystalline superhard material green body formed at high temperature and high pressure, and the polycrystalline superhard material green body comprises a polycrystalline superhard material product body, a working allowance grinding layer and an easy-to-grind grinding layer, the polycrystalline superhard material product is characterized in that the polycrystalline superhard material product body is a finished product which is obtained by grinding a polycrystalline superhard material blank and meets specification requirements; the machining allowance grinding layer is made of a fine-particle polycrystalline superhard material which is homogeneous to a polycrystalline superhard material product body and is completely identical in particle size; and the grindable grinding layer is a grinding layer of a pressed surface, and is a grindable grinding layer of coarse particles homogeneous to a polycrystalline superhard material and a grindable grinding layer of non-homogeneous to the polycrystalline superhard material. The raw material of the grindable grinding layer is coarse particle polycrystalline superhard material product body homogeneous micro powder, the particle size of the grindable grinding layer is larger than that of a polycrystalline superhard material product body, the porosity of the grindable grinding layer is larger than that of the polycrystalline superhard material product body, the larger the porosity is, the poorer the abrasion resistance is, grinding is easy, the machining cost is reduced, and the machining efficiency is improved. The gas suction effect of the metal powder can also reduce the content of impurity gas in the product body, and the effect is achieved.

The invention relates to the technical field of superhard material preparation, in particular to the related technical field of cobalt-free diamond compacts. The Ni-Cr binding agent cobalt-free diamond compact comprises a base body and a polycrystalline diamond layer, the base body is prepared from, by weight, 85-95 parts of WC, 5-13 parts of Ni and 0.4-2 parts of Cr, and Ni and Cr in the base body are distributed in gaps of WC grains; according to the Ni-Cr binding agent cobalt-free diamond compact, the wear resistance and heat resistance of the diamond compact can be improved, and meanwhile the binding strength between a polycrystalline diamond layer and a base body is enhanced.

The utility model relates to superhard material processing technical field, and disclose a kind of PCBN composite sheet edge strengthening treatment device, including rack, rotary workbench, laser processing module, coating deposition module and control system.The PCBN composite sheet edge strengthening treatment device, in combination with laser microstructured processing and nanometer coating deposition, significantly improve the hardness, wear resistance and bonding strength of PCBN composite sheet edge, solve the problem of single technical effect limited, rotary workbench design realizes the continuous processing of multiple PCBN composite sheets, improves production efficiency, reduces cost, accurately controls each module parameter by PLC system, ensures the consistency and stability of processing, reduces manual intervention, integrates laser processing, coating deposition and cooling system in one, compact structure, easy to operate.

The application discloses a kind of packing synthesis method of thick layer superhard material composite sheet, it is related to superhard material composite sheet synthesis technical field, comprising the following steps: (1) superhard powder and as catalyst and binder powder are mixed uniformly to obtain mixed powder;(2) mixed powder is laid flat and is loaded into metal cup, then hard alloy matrix is covered on the surface of mixed powder, cover is added on metal cup, to obtain preloading composite sheet;(3) preloading composite sheet is wrapped with metal foil, then it is placed in compaction mould after being wrapped with transmission pressure powder and is compacted;(4) preloading composite sheet is removed after demoulding, and is purified and shaped under high temperature in vacuum environment, to obtain purification and shaping composite sheet;(5) purification and shaping composite sheet is placed in heat preservation transmission pressure medium, and high temperature and high pressure synthesis is carried out, to obtain thick layer superhard material composite sheet.The application makes that metal cup shrinks uniformly when compaction powder, the synthesis of thick layer superhard material composite sheet can be realized, and the service life of compaction mould is improved.

The application provides a nano-diamond compact and a preparation method and application thereof, and belongs to the technical field of diamond compacts. The nano-diamond compact provided by the application comprises a hard alloy substrate and superhard material hot-pressed on the surface of the hard alloy substrate, and the superhard material is prepared from raw materials with the following mass percentage: diamond micro powder 85-95.5%; cubic boron nitride 1.5-6%; tungsten carbide 1-3%; cobalt powder 1-5%; tantalum powder 0.5-3%; vanadium powder 0.2-3%; and graphene 0.1-1%. The cubic boron nitride, the tungsten carbide and the graphene can toughen and strengthen the nano-diamond compact; the cobalt powder, the tantalum powder and the vanadium powder can catalyze and bond. The nano-diamond compact has good toughness, and can effectively avoid the cracking of the nano-structure diamond compact.

The invention discloses a high-stability rubidium-boron-silicon superhard compound and a preparation method thereof, and belongs to the technical field of superhard materials, the superhard compound is a composite structure block material formed by taking rubidium-boron-silicon as a basic framework and introducing an alkali metal regulator; the composite structure comprises a high-entropy ceramic matrix and nano twin crystals distributed in the matrix; the high-entropy ceramic matrix is a solid solution consisting of rubidium, boron, silicon and alkali metal cations introduced by the alkali metal regulator; the nano twin crystal is a lamellar crystal structure with coherent twin boundaries; through collaborative innovation of a material system and a preparation process, the rubidium-boron-silicon superhard compound with ultrahigh hardness and excellent thermal stability is developed, and a brand new solution is provided for superhard materials serving in an extremely high-temperature environment.