3411 results about "Diamond" patented technology

The invention discloses a method for improving the heat dissipation performance of an AlGaInP red light Micro LED chip. The method comprises the following steps: S1, preparing an epitaxial structure: processing a substrate and a buffer layer, growing an etching barrier layer and an ohmic contact layer, and carrying out stacking epitaxy on a functional layer; s2, patterning the silicon-based substrate: preparing a dielectric layer and a metal structure; s3, diamond ohmic contact layer integration: processing a p-type conductive diamond film layer, and carrying out metal reflection and bonding; s4, removing the substrate and forming an n-type structure: stripping the substrate to be in n-type contact; s5, back-end process integration: preparing an electrode and an optical structure; according to the invention, the heat dissipation performance of the chip is significantly improved; the series resistance is reduced by 30%-50%; the resistivity of the p / n type diamond ohmic contact layer is reduced by 1-2 orders of magnitude compared with ITO; gaAs material light absorption and metal shading are avoided, and the red light transmittance is improved from 75% to more than 90% by combining with the micro lens array; the method is compatible with existing MOCVD, CVD and photoetching processes, large-scale production of wafers of 2-12 inches can be achieved, and the manufacturing cost is reduced.

The invention relates to microwave-free sensor technology with NV centers in diamond. In contrast to the prior art, the intensity of the pump radiation is not PWM-modulated, but monofrequency and sinusoidally modulated. Further measures, such as the use of semiconductor-based pump radiation sources and operation with an offset, prevent the formation of harmonics in the temporal intensity profile of the pump radiation irradiating the NV centers in the sensor element. This allows the sensor system to use the phase shift to determine measured values ​​of external physical parameters such as magnetic flux density, acceleration, temperature, etc., within a recognized and disclosed frequency range of the intensity modulation of the pump radiation, thereby minimizing the influence of noise from the pump radiation source. The galvanic isolation does not need to be compromised by cables from additional sensors.

The invention discloses a gradually-changed Si-Al alloy coating diamond / aluminum-based composite material and a preparation method and application thereof, and the gradually-changed Si-Al alloy coating diamond / aluminum-based composite material is composed of an aluminum matrix and modified diamond evenly dispersed in the aluminum matrix. The modified diamond comprises diamond particles and a gradually-changed Si-Al alloy coating wrapping the surfaces of the diamond particles, in the gradually-changed Si-Al alloy coating, the mass fraction of Si is linearly decreased from 100% to 0% from inside to outside, and the mass fraction of Al is linearly increased from 0% to 100% from 0%. According to the method, the Si-Al alloy coating with gradually-changed and controllable components is constructed on the surface of the diamond, so that a SiC transition layer with strong binding force can be formed with the diamond, the gradient gradient coating is formed from inside to outside, internal stress can be released, good metallurgical bonding with an aluminum matrix can be achieved, formation of an Al4C3 phase is inhibited, and therefore the performance of the composite material is remarkably improved.

The invention provides a high-porosity ceramic bond diamond micro-powder grinding tool and a preparation method and application thereof. The preparation method comprises the following steps: preparing ceramic bond diamond micro-powder composite powder by adopting a sol-gel method; the preparation method comprises the following steps: preparing porous agglomerated diamond microspheres by taking ceramic bond diamond micro-powder composite powder and an organic pore-forming agent as raw materials and adopting an atomization granulation method; the preparation method comprises the following steps: taking sodium alginate and calcium salt as raw materials, and preparing a calcium alginate water ball solution by adopting a multiple emulsion method and an atomization granulation method; the porous agglomerated diamond microspheres and the calcium alginate water balls are used as main raw materials, and a gel casting method is adopted for preparing the ceramic bond diamond micro-powder grinding tool. According to the diamond micro-powder grinding tool, the organic pore forming agent and the sodium alginate water balls are used as the pore forming agents, so that the particle size and proportion of pores in the prepared diamond micro-powder grinding tool can be accurately controlled, and the diamond micro-powder grinding tool has the characteristics of high porosity, good self-sharpening performance, low grinding resistance and the like and can be used for efficient and high-quality machining of semiconductor materials.

The invention discloses a high-performance diamond cutter wear detection device and method, and relates to the technical field of wear detection, and the device comprises a structural characteristic obtaining module which obtains cutter structural characteristics; the cutting working condition characteristic acquisition module is used for acquiring cutting working condition characteristics of the cutter; the wear risk assessment module is used for carrying out wear risk assessment; the maintenance period optimization module is used for receiving the real-time cutting working condition and adaptively optimizing the tool maintenance period and the detection index priority; and the optimization module is adjusted, and the real-time cutting parameters are optimized. The technical problems that the detection frequency cannot be dynamically optimized according to different cutting working conditions, the timeliness and accuracy of wear detection are insufficient, and the service life of the tool is influenced in the existing tool wear detection are solved, and the purposes of dynamically adjusting the detection period and the index priority according to the change of the cutting working conditions, improving the timeliness and accuracy of wear detection and improving the working efficiency are achieved. The service life of the cutter is prolonged, and the technical effect of online nondestructive flaw detection of the high-performance diamond cutter is achieved.

The invention discloses a method for realizing high-quality stripping of large-size diamond by double-laser composite modification, which comprises the following steps: placing and fixing a sample on a three-dimensional mobile platform, and the upper surface of the sample is a crystal face (100); laser generated by an ultrafast laser generator penetrates through the upper surface of a sample and is focused into the sample, and then the laser generated by the ultrafast laser generator is used for performing first spot scanning on the sample to form an independent lattice structure; laser generated by the ultrafast laser generator is adopted to carry out secondary spot scanning on the sample to form a crack interconnected lattice structure; performing third-time line scanning on the sample by using laser generated by a nanosecond laser generator; and ultrasonically stripping the sample in water bath. By adopting a dual-laser composite modification process and combining bionic'honeycomb 'and'turtle shell' crack structure design, the crack is effectively guided to directionally extend along the crystal face (100), the problem of oblique crack when the stripping face is the crystal face (111) in the past is avoided, and the integrity and flatness of the stripping face are greatly improved.

The invention relates to the technical field of diamond epitaxial growth, and discloses an intelligent bias voltage regulation and control method and system for diamond single crystal heteroepitaxial growth, and the system comprises a data acquisition module, a prediction module, an intelligent optimization module, a gradient field compensation module and a feedback and regulation and control module. The future trend is pre-judged by adopting the prediction model, and potential growth abnormality such as nucleation probability reduction in a certain area can be perceived in advance, so that the control system has perspectiveness, and lagging of post passive compensation is avoided; the reinforcement learning controller comprehensively considers an accumulative effect and a long-term target in a strategy optimization process, so that bias voltage regulation and control are more intelligent; the intelligent decision-making capability is far better than that of an adjustment mode of artificial experience or a preset program, so that the growth process has stronger robustness on external disturbance such as airflow fluctuation and discharge state change; in the whole growth process, the consistency of crystal nucleuses and growth rates in all regions is kept, and the accumulation of thermal stress and defects in the large-size thin film can be inhibited.

The invention discloses a method and device for removing polyfluorinated perfluorides in a water body, and the method comprises the following steps: 1, pretreatment: removing large-particle impurities in the water body to be treated through a grid, then feeding the water body to be treated into a pH adjusting tank, and adding an acidic mixed solution to reduce the pH value to 4.0; 2, electrochemical oxidation: enabling the water body to flow into an electrochemical oxidation module, and reacting for 20-40 minutes under the voltage of 10V; when the method is implemented, long-chain PFAS is decomposed into short-chain products through three-stage cooperation of electrochemical oxidation, adsorption enrichment and membrane separation, so that subsequent removal of the short-chain PFAS is facilitated, the removal rate can be improved, the whole process is simpler compared with the prior art, and a large amount of cost is saved; the boron-doped diamond anode and the iron-cobalt bimetallic cathode are combined, and the modified biochar adsorbent is combined, so that the PFAS degradation rate is increased, and meanwhile, the electrode loss can be reduced.

The invention belongs to the field of materials, and particularly relates to a composite thermal interface material and a preparation method thereof. The preparation method comprises the following steps: plating non-reactive metal, non-reactive metal carbide or non-reactive ceramic on the surface of diamond micro powder, inducing lattice defects on the surface of a plating layer and alloying a local interface by combining a mechanical force field, and defoaming to obtain the composite thermal interface material. The composite thermal interface material has high thermal conductivity and long-term stability, and the contradiction between excessive alloying of a traditional reactive coating and high interface thermal resistance of a non-reactive coating is solved. The method is particularly suitable for the field of thermal management of high-end electronic devices such as 5G chips and power modules.

The invention discloses a uniformly distributed saw blade and a preparation method thereof, and relates to the technical field of saw blades. The evenly-distributed saw blade comprises a base body and tool bits, a plurality of tool bits are annularly welded to the periphery of the base body, a plurality of diamonds are distributed on the tool bits through a net plate adsorption evenly-distributed technology, the tool bits are formed by sintering matrix powder, and the matrix powder comprises, by weight, 30%-40% of copper powder, 20%-30% of copper-tin diffusion powder, 10%-20% of carbonyl iron powder and 5%-10% of nickel powder. And 10%-15% of tin powder. According to the saw blade preparation process, a screen adsorption uniform distribution process and saw blade uniform distribution design are adopted, it is guaranteed that when the first diamond is consumed by 1 / 5-2 / 3, the second diamond can be exposed, it is guaranteed that edges are exposed when the diamonds are consumed to any height, and the cutting continuity of the diamonds is improved. The diamond of 60-100 meshes is used in the saw blade, a finer cutting face can be formed in the cutting process, and the saw blade is suitable for machining tasks with the high requirement for cutting precision. The 60-100-mesh diamond particles are suitable for cutting hard and brittle materials, and edge breakage and cracks of the materials can be reduced in the cutting process.

The invention discloses a method for brazing and connecting diamond and copper through Ag-Cu eutectic brazing filler metal. The method comprises the following steps that S1, coating treatment is conducted on diamond, and surface metallized diamond is obtained after heating activation; s2, copper to be brazed and the surface metallized diamond are subjected to brazed connection through Ag-Cu eutectic brazing filler metal; wherein in the step S1, a titanium layer, a molybdenum layer and a nickel layer are sequentially deposited on the surface of the diamond, and coating treatment of the diamond is achieved. According to the method, the residual stress of the brazed joint can be reduced, the service life of the brazed joint is prolonged, the sealing performance of the brazed joint is improved, and important reference is provided for preparation of the large-size diamond microwave window.

The invention discloses an underwater magnetic field measuring device based on a diamond NV color center. The underwater magnetic field measuring device comprises a diamond NV color center module, an incident laser excitation module, a multi-path optical coupling module, a microwave excitation module, a fluorescence acquisition and photoelectric conversion module, a signal processing and control module and a magnetic field module, the multi-path optical coupling module is used for dividing an optical fiber into multiple paths and collecting fluorescence generated by the diamond block; the microwave excitation module is used for switching between two single-quantum resonance frequencies to drive an NV color center to realize double-quantum DQ reading; and the signal processing and control module comprises an FPGA (Field Programmable Gate Array) processing unit of a field programmable logic array chip. According to the invention, a dual-quantum DQ working point of a diamond NV color center is used as a measurement channel, common-mode influence of D is removed through differential measurement, the problem of D drift caused by temperature drift, stress and material aging is physically and obviously inhibited, and the device can still realize ultrahigh-sensitivity measurement in a complex underwater environment.

The invention discloses a high-strength wear-resistant self-lubricating drill bit for a coal mine and a preparation method of the high-strength wear-resistant self-lubricating drill bit. The preparation process comprises the steps that a drill bit blank is prepared from low-alloy carbon structural steel, a high-strength and high-toughness matrix is obtained through thermal refining, and then sand blasting activation is conducted to clean and coarsen the surface. After diamond particles are subjected to acid pickling pretreatment, metal modified diamond composite powder is obtained through salt bath metal and reduction prefabrication. The preparation method comprises the following steps: mixing MoS2 with the carbon dioxide, spraying the mixture on the surface of a matrix through high velocity oxy-fuel to form a wear-resistant coating, and then improving the density and interface bonding strength of the coating through high-frequency induction instantaneous remelting, thereby finally obtaining the coal mine drill bit with high hardness, strong bonding force and self-lubricating performance. The metal modified diamond composite coating containing the metal transition layer and the MoS2 lubricating phase is constructed on the steel substrate, and a high-frequency remelting process is combined, so that the wear resistance, the bonding strength and the self-lubricating performance of the drill bit are synergistically improved, and the drill bit has the advantages of high strength and toughness matching and low cost.

The utility model provides a preparation device of a doped diamond film. The preparation device comprises a first main body, a second main body, a heating assembly, a carrying assembly, a vacuum assembly and a laser emission assembly. The first main body is provided with a first cavity, the first cavity is provided with a base station used for bearing a base material, and the first cavity is used for being connected with reaction gas. The heating assembly is arranged in the first cavity, the second main body is provided with a second cavity, and the first cavity and the second cavity can be switched between a communicating state and an isolated state through the switch valve. The carrying assembly is arranged in the second cavity and used for conveying the doping target material from the second cavity to the first cavity or from the first cavity to the second cavity when the first cavity communicates with the second cavity. The vacuum assembly is used for vacuumizing the first cavity and / or the second cavity. The laser emitting assembly is used for emitting laser towards the doping target material located in the first cavity. According to the technical scheme, preparation of the doped diamond film doped with multiple elements is achieved.

To suppress spurious responses and also suppress degradation of main responses.SOLUTION: An elastic wave device 100 includes: a supporting substrate 10; a piezoelectric layer 14 formed on the supporting substrate 10; a pair of comb-shaped electrodes 20 provided on the piezoelectric layer 14; a first insulation layer 11 formed between the supporting substrate 10 and the piezoelectric layer 14, the first insulation layer being made of one of polycrystal or amorphous oxide aluminum and polycrystal or amorphous polysilicon; and a second insulation layer 12 formed between the first insulating layer 11 and the piezoelectric layer 14, the second insulation layer being made of aluminum nitride, silicon nitride, silicon carbide, or diamond-like carbon and having a first surface 60 adjacent to the first insulation layer 11 and a second surface 61 adjacent to the piezoelectric layer 14, and the first surface being rougher than the second surface.SELECTED DRAWING: Figure 1

The invention relates to the field of solid analysis, in particular to a diamond polishing and grinding online detection system which comprises the following steps: firstly, synchronously acquiring optical sensing data and thermal sensing data of the surface of a to-be-detected diamond; then, processing the acquired sensing data to detect and identify various physical characteristics of the surface, including a surface defect state, thermally induced anomaly distribution and self-calibrated surface roughness, and tracking an evolution trend of related characteristics, so as to generate a preliminary multi-dimensional characteristic analysis result; and finally, generating a comprehensive diamond defect surface physical property online evaluation report by integrating various analysis results. The method mainly solves the problems that the multi-dimensional physical characteristics of the surface of the diamond are difficult to evaluate in real time, accurately and comprehensively and the change of the surface state is difficult to respond quickly by a traditional detection means, and aims at comprehensively evaluating the surface quality of the diamond through automatic online analysis and providing a basis for guaranteeing the quality of a final product and optimizing a grinding process.

A diamond coating optimization implementation method for a hard and brittle material milling cutter comprises the following steps: according to a determined process environment and a pretreated specific milling cutter, sequentially carrying out a bottom coating orthogonal test to obtain corresponding optimal key control parameters, and carrying out a top coating orthogonal test to obtain corresponding optimal key control parameters; and finally, optimized manufacturing of the diamond coating of the hard and brittle material milling cutter is achieved after fusion. By optimizing the coating structure and the number of dynamic effective abrasive particles, the abrasive particle grinding effect is achieved, it is ensured that machining is conducted below the ductile-brittle transition critical cutting thickness, the abrasion resistance and machining quality of the tool are remarkably improved, and the problems that in the hard and brittle material machining process, the tool is fast in abrasion and poor in surface quality are effectively solved.

An MIM preparation method for an ultrahigh heat-conducting composite material based on diamonds and red copper. The method comprises the preparation of a mixture, internal mixing granulation, injection molding, and degreasing sintering. By means of the MIM process, not only can uniform mixing and high-density molding of diamonds and a red copper powder be achieved, thereby effectively overcoming the technical problems of non-uniform dispersity, low density, etc. during the preparation of a high-heat-conductivity composite material by means of a traditional process, but the shape and size of a product can also be accurately controlled, particularly during the production of a sheet material having a thickness of less than 1 mm; moreover, the heat conductivity (the heat conductivity thereof being up to 500-800 W / (m·K)) thereof is significantly improved and is significantly higher than that of a traditional metal material. In addition, by optimizing MIM process parameters and selecting raw materials having higher cost effectiveness, the present invention effectively reduces the production cost, such that large-scale use of the high heat-conducting composite material based on diamonds and red copper becomes possible, thereby satisfying the high-standard requirements of high-performance electronic equipment for heat dissipation materials.

The invention discloses a bi-component heat-conducting gel and a preparation method and application thereof, the bi-component heat-conducting gel comprises a component A and a component B. The component A comprises the following components in parts by mass: 100 parts of vinyl silicone oil A; 500 to 1500 parts of a heat conducting filler A; 1000 to 2000 parts of diamond with a core-shell structure; 0.5 to 10 parts of a coupling auxiliary agent A; 0.1-5 parts of a platinum catalyst; the component B comprises 100 parts of vinyl silicone oil B; 10 to 25 parts of hydrogen-containing silicone oil; 500 to 1500 parts of a heat conducting filler B; 1000 to 2000 parts of diamond with a core-shell structure; 0.5 to 10 parts of a coupling auxiliary agent B; 0.01 to 2 parts of an inhibitor; wherein the shell layer of the core-shell structure diamond is a magnesium hydroxide layer, and the inner core of the core-shell structure diamond is diamond. The bi-component heat-conducting gel disclosed by the invention has excellent heat-conducting property, low friction coefficient and low abrasion to equipment or elements in an application process.

The invention relates to the field of composite materials, in particular to wear-resistant paint for a drill rod, a preparation method of the wear-resistant paint, the drill rod with a surface wear-resistant coating and a preparation method of the drill rod. The preparation method of the wear-resistant coating for the drill rod comprises the following steps: S1, performing high-temperature oxidation treatment on composite powder of silicon carbide and diamond to obtain pretreated composite powder; s2, mixing the pretreated composite powder obtained in the step S1 with a silane coupling agent solution, heating and stirring, and then drying to obtain surface modified composite powder; s3, mixing epoxy resin with a toughening agent and a defoaming agent, heating, then adding the surface modified composite powder obtained in the step S2, uniformly mixing, and defoaming to obtain mixed slurry; s4, mixing the mixed slurry obtained in the step S3 with a curing agent, and defoaming to obtain the wear-resistant coating. The wear-resistant paint provided by the invention can form a coating with high wear resistance and high toughness on the surface of the drill rod.

According to the large-size single crystal diamond structure and the preparation method thereof, at least two diamond seed crystals are embedded into the grooves penetrating through the metal iridium film layer and the yttria-stabilized zirconia layer in the thickness direction, so that the single crystal diamond epitaxial layer can be grown on the diamond seed crystals through the homoepitaxy technology; meanwhile, the monocrystal diamond epitaxial layer is grown on the metal iridium body between the diamond seed crystals by utilizing a heteroepitaxy technology, so that the quality of the corresponding monocrystal diamond epitaxial layer between the diamond seed crystals can be improved; the problem that in the prior art, a splicing growth technology is adopted to obtain a large-size single crystal diamond epitaxial layer, steps or defects appear at splicing seams is solved, and therefore the large-size and high-quality single crystal diamond epitaxial layer can be obtained through the homoepitaxy and heteroepitaxy combined growth mode.

The invention relates to a purification method of high-purity diamond, and relates to the technical field of diamond purification. The purification method comprises raw material pretreatment, microwave-assisted ionic liquid stripping, solid-liquid separation and ionic liquid recovery, deep purification, separation and drying, and the raw material pretreatment comprises the following steps: crushing an impurity-containing coarse diamond raw material into particles of 2-5mm, then carrying out wet ball milling in ethanol for 4-6 hours, refining the particles to 50-200 microns, and carrying out microwave-assisted ionic liquid stripping on the particles to obtain refined particles; immersing the particles into a mixed solution of 10% diluted hydrochloric acid and 2% ammonium bifluoride, performing ultrasonic treatment for 2 hours, and performing centrifugal washing with ultrapure water until the particles are neutral; the microwave-assisted ionic liquid stripping method comprises the following steps: mixing the pretreated raw material with an ionic liquid according to a mass ratio of 1: (5-10), and carrying out microwave treatment for 10-30 minutes to obtain a reaction mixture. According to the purification method, diamond impurities are efficiently removed, meanwhile, the surface structure of the diamond can be protected against damage, waste liquid can be recycled, and the influence on the environment is small.

The invention discloses a full-automatic multi-component dispensing dynamic mixing proportion closed-loop control system, which relates to the technical field of semiconductor manufacturing, and comprises a multi-component feeding module, a dynamic proportioning execution module, an online detection module, an intelligent control module, a mixing reaction module, an anti-pollution module and a data management module, the device has the advantages that anti-sticking conveying and rapid switching of multi-form raw materials are achieved through a plurality of independent flow channels and inner wall diamond-like coatings of the multi-component feeding module in cooperation with a flow channel inlet vibrating screen and an outlet electromagnetic valve, a double-metering-pump parallel structure and a double-axial-flow type pulse damper are adopted in the dynamic matching execution module, and the dynamic matching efficiency is improved. And by combining a nonlinear model prediction controller of the intelligent control module and BP neural network adaptive compensation, the dynamic adjustment precision of the multi-component mixing ratio is remarkably improved, the mixing uniformity and purity reach the standard, the product scrapping caused by the ratio error is greatly reduced, and the photoresist production yield and stability are improved.

The invention relates to microwave-free sensor technology with NV centers in diamond. In contrast to the prior art, the intensity of the pump radiation is not PWM-modulated, but monofrequency and sinusoidally modulated. Further measures, such as the use of semiconductor-based pump radiation sources and operation with an offset, prevent the formation of harmonics in the temporal intensity profile of the pump radiation irradiating the NV centers in the sensor element. This allows the sensor system to use the phase shift to determine measured values ​​of external physical parameters such as magnetic flux density, acceleration, temperature, etc., within a recognized and disclosed frequency range of the intensity modulation of the pump radiation, thereby minimizing the influence of noise from the pump radiation source. The galvanic isolation does not need to be compromised by cables from additional sensors.

The invention provides a grinding fluid, the grinding fluid comprises a base fluid, a grinding material, nano-diamond and a dispersion stabilizer, the base fluid comprises polyether and silicone oil, the grinding material comprises surface modified silicon carbide particles, and the dispersion stabilizer comprises polyethylene glycol stearate and polyvinylpyrrolidone. The surface roughness of a grinding piece can be reduced, the scratch density and microcracks of the surface are reduced, damage of grinding fluid to the grinding piece is reduced or even avoided, and the service life of a cutter can be prolonged. The invention also provides a preparation method of the grinding fluid and a process method using the grinding fluid.

The invention provides a C-shaped diamond wire cutting machine. The C-shaped diamond wire cutting machine is provided with the operation table, the cutting frame, the cutting mechanism and the working table, and the cutting frame forms a C-shaped frame body structure through the first cross arm, the second cross arm and the connecting part. Threading holes are formed in the opposite positions of one end of the first cross arm and one end of the second cross arm, and a cutting line is led out from the two threading holes. And the workbench is located between the first cross arm and the second cross arm, and the cutting line can cut the materials on the workbench, so that the materials can be conveniently cut and processed. Due to the fact that the workbench is installed on the transverse rail in the sliding mode, and the transverse rail is installed on the longitudinal rail in the sliding mode, the position of the workbench can be adjusted in the front-back direction and the left-right direction, the material cutting flexibility is improved, the cutting quality is guaranteed, and the cutting efficiency is improved.

The invention belongs to the technical field of brazing materials, and particularly relates to micro-nano particle reinforced nickel-based ultralow-melting-point wear-resistant brazing filler metal and a preparation method and application thereof. The invention provides micro-nano particle reinforced nickel-based ultralow-melting-point wear-resistant brazing filler metal. The micro-nano particle reinforced nickel-based ultralow-melting-point wear-resistant brazing filler metal comprises 94-99 parts of ultralow-melting-point nickel-based brazing filler metal and 1-6 parts of micro-nano particles. The ultralow-melting-point nickel-based brazing filler metal contains B, Si, In, Sn and Cu elements at the same time, and the melting temperature of the brazing filler metal can be cooperatively reduced; and meanwhile, the micro-nano particles are added, so that the strengthening and abrasion increasing effects on the nickel-based brazing filler metal can be effectively guaranteed, and meanwhile the flowability of the brazing filler metal is not affected. Therefore, through component design of the nickel-based brazing filler metal and synergistic cooperation of the micro-nano particles, the melting point of the brazing filler metal can be remarkably reduced, the brazing filler metal can be endowed with excellent hardness and wear resistance, and the technical bottlenecks that traditional nickel-based brazing filler metal is high in melting temperature and poor in wear resistance and brazed diamond is subjected to thermal damage are solved; and the method has a wide application prospect in brazing of diamond tools.

The invention discloses nickel-based brazing filler metal doped with rare earth Tm and a brazed diamond thereof, and belongs to the technical field of brazing. The brazing filler metal is obtained through vacuum arc melting of element particles of Ni, Cr, B, Si, Fe and Tm under argon protection, the brazing filler metal comprises, by weight, 76.0%-82.0% of Ni, 9.0%-13% of Cr, 2.0%-4.0% of B, 3.0%-5.0% of Si, 2.0%-5.0% of Fe and 0-2% of Tm, and the brazing diamond is obtained through heating under the conditions that the vacuum degree is smaller than 2.0 * 10 <-3 > Pa, the brazing temperature is 1080 DEG C and the heat preservation time is 5 min. Results show that Tm doping can optimize the structure of the brazing filler metal, improve the mechanical property of brazing filler metal alloy, effectively improve the holding strength of the diamond in the brazing process and effectively inhibit thermal damage of the diamond after welding, so that the diamond can maintain the original performance to a large extent, and has better wear resistance in the service process.

The invention relates to the field of abrasive materials, in particular to an efficient grinding diamond abrasive material and a preparation process thereof.The efficient grinding diamond abrasive material is prepared by coating diamond micro-powder for multiple times to prepare composite diamond micro-powder, then blending the composite diamond micro-powder with electrolytic copper powder, filler, a wetting agent and modified polyvinyl alcohol to obtain slurry, and conducting freezing-unfreezing gel forming to obtain the efficient grinding diamond abrasive material. The prepared diamond grinding material is good in water resistance and efficient in grinding; the preparation method comprises the following steps: depositing a tungsten coating on the surface of diamond micro-powder, then carrying out vacuum high-temperature treatment to obtain pretreated diamond micro-powder with a tungsten carbide layer growing in situ on the surface, generating a silicon oxide layer on the pretreated diamond micro-powder by using tetraethoxysilane, and then generating praseodymium-doped cerium oxide nanoparticles on the surface of the modified diamond micro-powder by using a homogeneous precipitation method; the preparation method comprises the following steps: carrying out chain extension treatment on a prepolymer generated by polytetrahydrofuran ether glycol and 4, 4 '-dicyclohexylmethane diisocyanate by using a silicon-containing chain extender to obtain a polyurethane prepolymer, and then modifying polyvinyl alcohol by using the polyurethane prepolymer and phenolic resin.