485 results about "Polycrystalline diamond" patented technology

The invention relates to the technical field of diamond growth, and provides a preparation method of a polycrystalline diamond wafer and the polycrystalline diamond wafer, the method comprises the following steps: providing a sample with a first surface and a second surface opposite to each other, and pre-growing a first polycrystalline diamond layer on the first surface of the sample; the sample is placed on a molybdenum sheet table in chemical vapor deposition equipment, the first polycrystalline diamond layer faces the molybdenum sheet table, a second polycrystalline diamond layer grows on the second face of the sample, the sample is formed, and the thickness of the second polycrystalline diamond layer is larger than that of the first polycrystalline diamond layer; and separating the second polycrystalline diamond layer from the sample to obtain the polycrystalline diamond sheet. According to the polycrystalline diamond wafer prepared by the method, the warping control and the thickness uniformity are remarkably improved, the yield of finished products is high, the processing efficiency is high, and the production cost is low.

The invention discloses a brazing method for improving the welding strength of a polycrystalline diamond cutter and a hard alloy. The brazing method comprises the following steps that S1, brazing filler metal alloying is conducted; and S2, the PCD tool bit and the hard alloy matrix are subjected to vacuum brazing. According to the brazing filler metal, an Ag-Cu-Co system is adopted, Ag mainly plays a role of a solder matrix and provides plasticity and thermal conductivity, Cu mainly plays a role of forming an eutectic structure with Ag and reducing the melting point, and Co mainly plays a role of wetting the surfaces of PCD and hard alloy. Co infiltration is adopted in the preparation process of the PCD tool bit used in the method, so that a certain amount of Co exists on the PCD surface, and the hard alloy tool body also contains Co, and therefore, a small amount of Co in the brazing filler metal can better wet the welding surface according to the similar intermiscible principle. In the vacuum brazing process, additional pressure does not need to be applied, when the brazing filler metal is molten, the brazing filler metal is evenly laid on the welding face under the action of the pressure of the PCD tool bit on the upper portion and the capillary effect, the redundant brazing filler metal can flow out of the two sides of the mold, and the flatness of the welding surface can be effectively guaranteed.

The invention relates to a polycrystalline diamond compact and a preparation method thereof, and belongs to the field of preparation of polycrystalline diamond compacts. The polycrystalline diamond compact is composed of a hard alloy matrix layer and a polycrystalline diamond layer, the hard alloy matrix layer is made of tungsten carbide and Co and Ni adhesives, and the usage amount of Co and the usage amount of Ni account for 8.5%-10% and 1.5%-3% of the mass of the hard alloy matrix layer respectively; tungsten carbide raw materials for preparing the hard alloy matrix layer are composed of, by volume fraction, 10%-15% of coarse particle size tungsten carbide, 75%-80% of medium particle size tungsten carbide and 5%-10% of fine particle size tungsten carbide, the coarse particle size ranges from 10 micrometers to 15 micrometers, the medium particle size ranges from 2 micrometers to 8 micrometers, and the fine particle size is smaller than 1 micrometer. Co and Ni are used as adhesives of the hard alloy matrix layer, the use amount of Co and Ni is controlled, and distribution of the particle size of tungsten carbide is combined, so that the polycrystalline diamond compact has chemical corrosion resistance and wear resistance at the same time.

The invention relates to the technical field of drilling engineering, and discloses an impact-assisted rock breaking inwards-concave PDC drill bit which comprises a drill bit body and an impact structure, and the drill bit body is provided with an inner cavity and a first transmission protrusion arranged at the head of the drill bit body; the impact structure comprises a turbine, a transmission shaft and an impact blade, the turbine is arranged in the inner cavity of the drill bit body, the impact blade is arranged outside the drill bit body, the transmission shaft is connected between the impact blade and the turbine and provided with a second transmission protrusion, and the turbine is used for driving the transmission shaft to rotate; the second transmission protrusion and the first transmission protrusion abut against each other or are staggered in the rotating process. The impact cutter wings are used for stretching out relative to the drill bit body when the second transmission protrusions abut against the first transmission protrusions; a reset spring is further arranged between the transmission shaft and the drill bit body and used for driving the impact blades to reset when the second transmission protrusions and the first transmission protrusions are staggered. The high-frequency axial reciprocating motion of the impact blades directly crushes the center area of the drill bit, and the rock breaking efficiency of the center area of the drill bit is improved.

A cutting element for an earth-boring tool includes a substrate and a volume of polycrystalline diamond on the substrate. The volume of polycrystalline diamond has exterior surfaces defining a front cutting surface, a peripheral edge, and at least a pair of angled tip surfaces defining at least one cutting tip between the pair of angled tip surfaces. The front cutting surface includes a first planar region and a second planar region, one or both of which may include a cutting tip. The front cutting surface may be characterized as generally concave. Earth-boring tools include a tool body and one or more such cutting elements secured to the tool body.

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 discloses an ultrathin PCD / PCBN (Polycrystalline Diamond / Polycrystalline Boron Nitride) composite sheet and an alternate lamination preparation process thereof, and the process comprises the following steps: preparing a PCD prefabricated body layer and a PCBN prefabricated body layer, and depositing gradient transition layers on the surfaces of the two prefabricated body layers respectively; processing a microstructure with a preset pattern on the surface of the gradient transition layer by adopting a laser etching technology, and filling the etched microstructure with a conductive material with high thermal conductivity; the PCD prefabricated body layers and the PCBN prefabricated body layers are alternately stacked and assembled, and interlayer bonding is completed through ultrahigh-pressure staged sintering; injecting a reinforcing phase into the microstructure of the interface of the sintered composite sheet through ultrasonic-assisted permeation so as to carry out interface reinforcing treatment; through the gradient transition layer and the laser etching microstructure, thermal expansion adjustment between multiple layers of composite sheets is achieved, the problems of thermal stress concentration and interlayer stripping are effectively relieved, meanwhile, through the high-thermal-conductivity filling material and reinforced phase permeation, the interface thermal conductivity and shear strength are improved, and the structural stability of the interface between the ultrathin composite sheets is achieved.

The invention provides a laser device and method for removing residual polycrystalline diamond on the surface of a molybdenum support, the device comprises a shell, a laser and an X-ray diffraction processing device, a scanning head of the laser is arranged at the top of an inner cavity of the shell and is used for emitting laser beams to focus and irradiate the surface of the molybdenum support; the X-ray diffraction processing device is composed of an X-ray emitter and a detector which are arranged on the side of the inner cavity and used for conducting in-situ component analysis on the surface of the molybdenum support in the cleaning process, accurately judging the residual state and the residual area of the polycrystalline diamond and conducting secondary scanning on the residual area to ensure that cleaning is thorough and reaches the standard. The method is efficient and rapid, the surface of the molybdenum support can be effectively protected against damage, the uniformity of the heat conduction performance of the molybdenum support is guaranteed, and the service life is remarkably prolonged.

The invention discloses a preparation method of a high-quality self-supporting polycrystalline diamond substrate. The preparation method comprises the following steps: obtaining a larger first substrate and a smaller second substrate; the molybdenum substrate is a polished molybdenum metal substrate; sowing diamond seed crystals on the first substrate by using an ultrasonic sowing method, and growing a nanocrystalline diamond epitaxial layer by using a CVD (Chemical Vapor Deposition) process; cutting the first substrate by using precise laser to obtain an annular polycrystalline diamond solid seed crystal of which the inner diameter is greater than that of the second substrate; placing a second substrate in the inner diameter of the second substrate, guiding generated tiny diamond grains to the second substrate through a boundary induction mechanism and applying direct current bias voltage, and uniformly wrapping the tiny diamond grains to form a self-supporting polycrystalline diamond substrate; according to the preparation method of the self-supporting polycrystalline diamond substrate, the orientation consistency and the crystallization quality of a diamond film are remarkably improved, and the prepared self-supporting polycrystalline diamond substrate has the advantages of being low in surface roughness, compact in structure, simplified in follow-up process and the like.

The invention belongs to the technical field of PDC drill bits, and particularly relates to a rotatable blade PDC drill bit which comprises a drill bit body. A plurality of supports are fixedly connected to the drill bit body, three inserting grooves are formed in each support, and the three inserting grooves are one long inserting groove and two short inserting grooves. A blade wing is arranged on the support; three fasteners of the same type penetrate through one first inserting block and two second inserting blocks respectively to be connected to the support in a threaded mode, so that the blades are assembled, large torque and impact force can be borne in the drilling process, the blades are not prone to loosening, the multiple blades are installed on the drill bit body in the drilling process, and the drilling efficiency is improved. The multiple blades rotate along with the output end of the drilling machine to drill into a soil rock layer, and rotation of the PDC drill bit blades is achieved. When a certain blade is abraded and damaged, the blade can be conveniently taken down from the support to be replaced only by disassembling the corresponding fastener, the whole drill bit does not need to be disassembled on a large scale, the maintenance cost is greatly reduced, and the maintenance time is greatly shortened.

The invention provides a method for improving the thickness uniformity of polycrystalline diamond, and belongs to the technical field of semiconductors, and the method comprises the following steps: carrying out chamfering grinding on an edge intersection angle area of a silicon substrate; covering polycrystalline diamond seed crystals on the surface of the silicon substrate subjected to chamfering treatment; growing polycrystalline diamond on the polycrystalline diamond seed crystal; polishing to enable the thickness deviation between the edge intersection angle area and the central area of the polycrystalline diamond to be 1t; 10 m. By means of the method, the thickness deviation of the edge intersection angle area and the center area of the polycrystalline diamond can be reduced, the thickness uniformity of the polycrystalline diamond is improved, the cracking problem caused by the temperature deviation of the edge intersection angle area and the center area is prevented, the finished product quality is improved, and the rejection rate and the production cost are reduced.

The invention provides a large-area polycrystalline diamond GaN heterostructure with a slowly-changing Sc component transition layer and a preparation method of the large-area polycrystalline diamond GaN heterostructure. The preparation method comprises the steps that polycrystalline diamond is pretreated, and a polycrystalline diamond substrate is obtained; performing etching mask deposition and patterning on the polycrystalline diamond substrate, and forming a plurality of nano columnar structures in the upper region of the polycrystalline diamond substrate; carrying out magnetron sputtering on a first ScAlN transition layer with 35% of Sc component at the nano columnar structure; epitaxially growing a second ScAlN transition layer with 30% of Sc component on the first transition layer; epitaxially growing a third ScAlN transition layer with 20% of Sc component on the second transition layer; epitaxially growing a fourth ScAlN transition layer with 10% of Sc component on the third transition layer; and epitaxially growing a GaN epitaxial layer on the fourth transition layer. According to the method, the magnetron sputtering technology and the epitaxial ScAlN technology are combined, the respective advantages are exerted, the large-area and high-quality diamond-based GaN silbby batch is prepared, and good conductivity, high thermal stability and high reliability are achieved.

The invention discloses a plasma rotation type large-area polycrystalline MPCVD diamond growth method, and relates to the technical field of microwave plasma chemical vapor deposition, and the method comprises the following steps: S1, setting environmental parameters of diamond growth in a reactor through a microwave feeder, sampling plasma state data in the reactor, and calculating the plasma state data; if the plasma is stably started, executing S2; and S2, the plasma state in the reactor is adjusted through the plasma regulator according to the plasma state data in the reactor, the coverage area of plasma discharge is increased, and then the growth area of the polycrystalline diamond is increased.

The invention discloses a superhard cutter surface micro-nano structure preparation method based on ultrafast laser and a cutter. The method comprises the steps that a polycrystalline diamond cutter is fixed to a three-axis precision motion platform and precisely positioned and calibrated; after cleaning and online detection, parameters of the ultrafast laser are configured based on a result, and machining is executed; and evaluating the structure characterization of the generated laser-induced periodic surface. According to the method, thermal damage is avoided by means of the ultrafast laser near-cold machining characteristic, parameters are precisely regulated and controlled, a high-precision structure is efficiently prepared, the process is flexible and controllable, the limitation of a traditional technology is broken through, the tool performance is improved, a scheme is provided for cutting of aerospace materials difficult to machine, and non-damage microtexture preparation on the surface of the superhard tool is achieved.

The invention provides a multi-blade type self-adaptive PDC drill bit and belongs to the technical field of PDC drill bits, the multi-blade type self-adaptive PDC drill bit comprises a drill bit body, blade parts and adjusting nozzles, one end of the drill bit body is a threaded end used for being connected with a drill rod, the other end of the drill bit body is a rock breaking end, the multiple blade parts are arranged at intervals in the circumferential direction of the rock breaking end, and at least one adjusting nozzle is embedded in a branch flow channel. The adjusting nozzle comprises a valve assembly, a sliding block and an elastic component. The valve assembly is arranged at the end, close to the drill bit body, of the branch flow channel and used for controlling on-off and opening of the drilling fluid flow. The sliding block is arranged in the branch flow channel in a sliding mode, and an acceleration flow channel communicating with the branch flow channel is further arranged in the sliding block. One end of the elastic component is connected with the sliding block, the other end of the elastic component is connected with the valve assembly, and the elastic component is used for providing elastic force to drive the valve assembly to telescopically slide to adaptively adjust drilling fluid flow; the pressure needed by sliding of the sliding block is larger than that needed by sliding of the valve assembly. The problem that in the prior art, the rock cleaning and cooling effects of a PDC drill bit are not stable can be effectively solved.

The invention relates to the technical field of cutting pick machining, in particular to a high-temperature-impact-resistant PDC cutting pick preparation technology, it is guaranteed that the purity and the granularity meet the requirements through selection of raw materials, for example, silicon carbide whiskers and multi-walled carbon nanotubes have high high-temperature resistance, the high-temperature thermal stability of polycrystalline diamond compacts is greatly enhanced through addition of the silicon carbide whiskers and the multi-walled carbon nanotubes, and the high-temperature impact resistance of the polycrystalline diamond compacts is improved through addition of the silicon carbide whiskers and the multi-walled carbon nanotubes; the preparation method comprises the following steps: preparing raw materials, removing impurities on the raw materials through pretreatment to ensure the surface activity so as to facilitate subsequent combination, then removing the surface adsorption phenomenon of the raw materials and avoiding possible oxidation reaction through wet ball milling, sieving and reduction, and then carrying out preliminary forming through low-pressure pre-pressing to discharge air in the raw material powder and improve the pressing density; according to the high-temperature and ultrahigh-pressure sintering process for the polycrystalline diamond compact with the SiCw / CNTs added, the density and the shape of a green body are ensured, and then the finished PDC cutting pick meeting the requirement is obtained through high-temperature and high-pressure sintering, step-by-step pressure relief and finish machining.

The present invention relates to a method for preparing a polycrystalline diamond composite sheet. The method comprises the following steps: soaking diamond particles of primary and secondary sizes in strong acid and alkali, and repeatedly washing with pure water; sandblasting a cemented carbide substrate; mixing the primary and secondary diamond particles in a mixer; placing the mixed diamond particles and cemented carbide substrate in a high-temperature resistant metal cup; placing a composite block in the metal cup, and placing the metal cup in a six-sided top press; and performing three-stage high-pressure and two-stage high-temperature sintering. The first stage is high-pressure, cold pressurization to 6.5-8.2 GPa, maintained for 30-60 seconds; the second stage is high-pressure and simultaneous heating, sintering at a pressure of 6-8 GPa, a temperature of 1490-1580°C, maintained for 300-600 seconds; and the third stage is high-pressure and simultaneous heating, pressure of 5.0-6.0 GPa, a temperature of 1150-1250°C, maintained for 150-200 seconds. The pressure and temperature are then reduced to normal pressure and room temperature to obtain a polycrystalline diamond composite sheet blank. After sintering, fine particles are evenly distributed around coarse particles.

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 provides a low-warping-degree polycrystalline diamond film and a preparation method thereof, and the preparation method comprises the following steps: S1, depositing a layer of neutralization material with a thermal expansion coefficient lower than that of monocrystalline silicon on the surface of one side of a monocrystalline silicon substrate to form a neutralization layer; s2, carrying out mechanical grinding treatment on the surface of the other side of the monocrystalline silicon substrate and cleaning the surface; and S3, putting the processed monocrystalline silicon substrate into microwave plasma chemical vapor deposition equipment, enabling the neutralization layer to face downwards to be in contact with the molybdenum tray, and carrying out growth of the polycrystalline diamond film. A third heterogeneous material is introduced into the double-layer composite structure by adopting a physical or chemical vapor deposition method, the thermal expansion coefficient of the third heterogeneous material is lower than that of monocrystalline silicon, the shrinkage difference between the polycrystalline diamond film and the monocrystalline silicon can be effectively adjusted during cooling, and the warping degree of the polycrystalline diamond film composite substrate is effectively reduced; the polycrystalline diamond film obtained through the method is low in warping degree, the subsequent grinding and polishing time can be effectively shortened, and the manufacturing cost of the polycrystalline diamond film for optics and heat sinks is reduced.

The invention provides a large-size CVD (chemical vapor deposition) polycrystalline diamond film surface grinding method, belongs to the technical field of diamond material processing, and aims to solve the technical problems of low CVD polycrystalline diamond chemical mechanical grinding and polishing efficiency and high consumption. The preparation method comprises the following steps: firstly, carrying out graphical processing on the surface of a CVD polycrystalline diamond film by adopting a laser processing method, then plating diamond micro-powder with a nano-thickness catalyst layer, then mixing the diamond micro-powder with the catalyst layer and an oxidizing agent to obtain a grinding liquid, then grinding the polycrystalline diamond film, and finally carrying out annealing treatment to obtain the polycrystalline diamond film with the nano-thickness catalyst layer. And further obtaining the polycrystalline diamond film with low internal stress and nanoscale roughness on the surface. According to the method, the processing efficiency of the polycrystalline diamond film can be improved to a great extent and the surface roughness can be reduced through the surface patterning of the CVD polycrystalline diamond film, the plating of the diamond micro-powder catalyst layer and the grinding fluid preparation coupled grinding processing effect.

The invention relates to the technical field of microwave plasma chemical vapor deposition, in particular to MPCVD equipment and a preparation method for preparing a large-size polycrystalline diamond film, a quartz ring is arranged in a reaction chamber, a water-cooled copper substrate table is arranged at the top of the quartz ring, a molybdenum ring is arranged at the top of the water-cooled copper substrate table, and a water-cooled copper-based sample table is arranged in the center of the molybdenum ring; the bottom of the water-cooled copper-based sample table is connected with a lifting pipe, the top of the water-cooled copper-based sample table is provided with a molybdenum support, and the top of the molybdenum support is provided with a sample ring; two infrared temperature measurement sensors are arranged outside a temperature measurement observation window of the reaction chamber and are respectively aligned with the edge and the central area of the sample ring; a copper-based sample table cooling water path and a thermal resistance wire are arranged in the water-cooled copper-based sample table in a staggered manner, the thermal resistance wire is electrically connected with the electric heating control device, and the electric heating control device is electrically connected with the double-infrared temperature measuring device. According to the method, the temperature uniformity of the inner and outer areas in the large-size polycrystalline diamond film deposition process can be improved.

The invention provides a heat dissipation ring assembly of a microwave plasma chemical vapor deposition device, the heat dissipation ring assembly comprises a first annular structure and a second annular structure which have the same central axis, the first annular structure is suitable for being arranged on the upper surface of a base table in a heat conduction mode, and an inner area in the middle of the first annular structure comprises a diamond growth area; the first annular structure is used for placing a wafer and growing diamond on the wafer, the second annular structure is suitable for being arranged on the upper surface of the base table in a heat conduction mode and arranged between the first annular structure and the wafer in a sleeved mode, and the heat conductivity of the second annular structure is lower than that of the first annular structure. And the temperature of the first annular structure is properly reduced, so that the growth rate of the polycrystalline diamond on the surface of the first annular structure is reduced.

The invention relates to an oil-paper composite insulation PDC (Polycrystalline Diamond Compact) measuring system and method in an insulating oil flowing state, and a tested sample assembly is arranged between an upper electrode cover and a lower electrode cover and comprises an oil gap gasket for providing an oil gap channel, oil impregnated paper and oil flow flowing through the oil gap channel; the PDC measuring circuit comprises a high-voltage electrode arranged on the upper electrode cover and a measuring electrode arranged on the lower electrode cover, a high-voltage direct-current power supply is connected to the high-voltage electrode after being connected with a high-voltage relay and a current-limiting resistor in series, and the measuring electrode is grounded after being connected with an over-current protection module and a high-resistance meter in series; the insulating oil flow speed control oil way comprises an oil storage tank, and insulating oil in the oil storage tank is driven by the oil pump to flow into the upper electrode cover and the lower electrode cover through the pressure buffering tank, flows through the oil gap channel to form oil flow and then returns to the oil storage tank. By simulating conditions of different flow rates of the insulating oil, measurement of the oil-paper composite insulation PDC in the flowing state of the insulating oil is realized, and related information closer to the insulation state of a large oil-immersed power transformer in the actual working condition is obtained.

A polycrystalline diamond inner and outer surface processing method belongs to the technical field of optical element manufacturing, and comprises the following steps: processing a silicon-based substrate with the outer surface having a predetermined spherical curvature, the outer surface precision and surface roughness meeting the requirements of the inner surface of the processed polycrystalline diamond; growing a polycrystalline diamond layer on the outer surface of the silicon-based substrate to form a composite structure body, and enabling the inner surface of the polycrystalline diamond layer to directly copy the spherical morphology of the outer surface of the silicon-based substrate; multi-stage step-by-step machining is conducted, rough grinding, laser and accurate grinding combined machining or laser and accurate grinding combined machining is conducted on the outer surface of the polycrystalline diamond layer, and therefore the quality of the outer surface is improved; removing the silicon-based substrate to obtain a complete polycrystalline diamond; and cleaning the inner and outer surfaces of the polycrystalline diamond, and detecting the roughness, surface shape precision and wall thickness uniformity of the inner and outer surfaces to meet the process requirements, thereby finishing the machining of the inner and outer surfaces of the polycrystalline diamond. According to the device, efficient removal, low damage and high-precision inner and outer surface forming are achieved.

The invention discloses a PDC (Polycrystalline Diamond Compact) drill bit assembly with a self-pulling-out function and an anti-jamming mechanism, which belongs to the technical field of PDC drill bits and comprises a power module, a transmission module and a drill bit module, the power module comprises an upper power connector, an overflow pressure stabilizing module, a limiting bearing, a spring and a band-type brake mechanism, the upper power connector is connected with an upper drill column, the overflow pressure stabilizing module, the limiting bearing and the spring are sequentially arranged in the upper power connector, and the upper power connector is connected with the transmission module through the band-type brake mechanism; the transmission module comprises a torque part, a drilling part and a lower power connector, the torque part is connected with the upper power connector, the drilling part is installed between the torque part and the lower power connector, and the lower power connector is connected with the drill bit module; the drill bit module comprises a drill bit body, a crawler belt mechanism and PDC teeth, and the PDC teeth and the crawler belt mechanism are arranged on the drill bit body; the rotation direction of the overflow pressure stabilizing module under the action of drilling fluid is opposite to the rotation direction of the drill bit module during normal drilling.

Embodiments of the invention relate to polycrystalline diamond compacts (“PDC”) exhibiting enhanced diamond-to-diamond bonding. In an embodiment, a PDC includes a polycrystalline diamond (“PCD”) table bonded to a substrate. At least a portion of the PCD table includes a plurality of diamond grains defining a plurality of interstitial regions. The plurality of interstitial regions includes a metal-solvent catalyst. The plurality of diamond grains exhibit an average grain size of about 30 μm or less. The plurality of diamond grains and the metal-solvent catalyst collectively exhibit an average electrical conductivity of less than about 1200 S / m. Other embodiments are directed to PCD, employing such PCD, methods of forming PCD and PDCs, and various applications for such PCD and PDCs in rotary drill bits, bearing apparatuses, and wire-drawing dies.

This disclosure includes a sucker rod string, a tubing protector, and a tool joint with a polycrystalline diamond element positioned thereon for mating with other surfaces in downhole applications. The polycrystalline diamond element can be positioned on the sucker rod guide, sucker rod connector, tubing protector, and tool joint.

The invention provides a diffusion welding method of a CoZrTaB target material, which comprises the following steps: (1) carrying out finish machining on a CoZrTaB target blank to a welding size, and processing a thread on a welding surface of the CoZrTaB target blank by adopting a polycrystalline diamond screwer; (2) first cleaning and PVD titanium film plating are sequentially carried out on the welding face with the machined threads, and a to-be-welded CoZrTaB target blank is obtained; the back plate is subjected to finish machining to the welding size, and a to-be-welded back plate is obtained; and (3) the to-be-welded CoZrTaB target blank and the to-be-welded back plate are sequentially subjected to second cleaning, assembling, sheath welding, high-temperature degassing and diffusion welding, and the diffusion-welded CoZrTaB target material is obtained. According to the diffusion welding method, the polycrystalline diamond screwer is adopted to machine the threads on the welding face of the CoZrTaB target blank, then the titanium film is plated, and the CoZrTaB target material which is high in welding strength and meets the high-temperature sputtering use requirement is obtained.

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 utility model discloses a polycrystalline diamond radial centralizing sliding bearing which comprises a static ring, a movable ring arranged on the inner side of the static ring, a wear-resistant pad and a first polycrystalline diamond layer arranged on the inner side of the movable ring, a second polycrystalline diamond layer arranged on the outer side of the static ring, and a rolling ball arranged on the static ring. A first lubricating groove and a second lubricating groove are formed in the static ring, a first filter screen is fixedly connected to the top of the first lubricating groove, a first retention groove is fixedly connected to the bottom end of the first lubricating groove, a first lubricating channel and a first calandria are communicated to the first retention groove, and a second filter screen is fixedly connected to the top of the second lubricating groove. The bottom end of the second lubricating groove is fixedly connected with a second detention groove, and the second detention groove communicates with a second calandria and a second lubricating channel. By means of the device, the first lubricating groove, the second lubricating groove, the calandria and the lubricating channel are conveyed to the rolling balls, so that the lubricating efficiency is improved, and frictional wear is reduced.