72 results about "Laser energy density" patented technology

The invention discloses a method for preparing an aluminum alloy capillary structure based on a selective laser melting technology, which comprises the following steps of: comprehensively regulating and controlling technological parameters of selective laser melting according to laser energy density by utilizing the forming principle of'incomplete melting pores' and'keyhole pores' in a selective laser melting forming process; and the porosity-adjustable aluminum alloy capillary structure is prepared. The method mainly comprises the following steps that firstly, aluminum alloy spherical powder with the particle size range suitable for the selective laser melting process is selected; secondly, a laser energy density reference value is selected according to the optimal technological parameters of selective laser melting forming of the aluminum alloy solid structure; then, according to the laser energy density, the laser power, the scanning rate, the scanning interval and other technological parameters are comprehensively regulated and controlled, the powder laying layer thickness is set, and the aluminum alloy capillary structure is prepared; and finally, the porosity of the capillary structure is measured, the correlation between the technological parameters and the porosity is established, a technological window is determined, and the aluminum alloy capillary structure with the adjustable porosity is prepared.

The invention discloses a 3D printing data detection method, which relates to the technical field of 3D printing detection, and comprises the following steps: S1, slicing and layering a to-be-printed three-dimensional model to obtain a plurality of two-dimensional section graphs; s2, carrying out laser scanning printing on the plurality of two-dimensional section graphs, generating an energy modulation item and a molten pool dynamic modulation item, and obtaining a metal printing risk quantized value of each two-dimensional section graph; and S3, determining a printing fault detection result according to the metal printing risk quantized value of each two-dimensional section graph. The laser energy density change rate, the powder layer thickness, the laser effective area, the molten pool solidification time and other key process parameters are comprehensively considered, the influence of energy input stability on the incomplete fusion risk is described through the energy modulation item, the effect of the over-fusion risk is reflected through the molten pool dynamic modulation item, the core influence factors of the printing quality are comprehensively covered, and the printing quality is improved. And a more reliable basis is provided for fault pre-judgment.

The invention provides a transparent restraint layer suitable for laser shock and a laser shock forming method and device of a metal plate, belongs to the technical field of metal plate laser processing, and aims to solve the technical problem of failure of the restraint layer in a low-temperature environment. The forming method comprises the steps that an absorption layer and a transparent restraint layer are sequentially laid on the surface of a to-be-impacted workpiece, and the transparent restraint layer sequentially comprises a polyurea-polyurethane elastomer layer, a nanofluid layer and a hydrogel layer in the direction close to the to-be-impacted workpiece to the direction away from the to-be-impacted workpiece; a single-laser-head or multi-laser-head array is adopted to implement pulse impact, and a temperature-stress-displacement multi-physical-field closed loop is constructed through displacement sensing, temperature sensing and ultrasonic stress sensing; and the industrial controller operates a model prediction control algorithm to perform linkage optimization on the laser energy density E, the scanning speed v and the hydrogel layer volume flow q. Compared with an existing double-layer constraint and double-feedback scheme, the method has remarkable technical progress in the aspects of low-temperature stability, array consistency and forming consistency.

The application discloses a glass substrate hole modification method and an integrated waveguide manufacturing method, and comprises the following steps: focusing a laser focus on one side of a glass substrate close to the bottom surface thereof; controlling the laser focus to perform annular scanning along the outer contour of a preset hole to form a closed modification ring; controlling the laser focus to perform point-by-point scanning with a preset dot array interval in the internal area surrounded by the modification ring to form an array distributed modification dot array; and making the laser energy density of the annular cutting area of the modification ring lower than the laser energy density of the filling area of the modification dot array. The application can assist in high-precision preparation of a through hole and a blind hole with a vertical sidewall and a flat bottom on a glass substrate, thereby effectively improving the performance of a millimeter wave slow wave passive device and reducing the cost.

This invention discloses a method for preparing epitaxial stress-controlled polarized metals, belonging to the field of functional oxide thin film preparation. The method includes: performing a special high-temperature annealing pretreatment on a YAlO3(111) substrate; calibrating the pulsed laser deposition rate and using a moving mask technique to prepare a wedge-shaped thin film with continuously varying thickness; and precisely controlling key process parameter windows such as growth temperature, laser energy density, oxygen partial pressure, and the distance between the target and the substrate. This invention obtains an ideal nucleation template by optimizing the substrate pretreatment process, achieves linear modulation of the thickness gradient by precisely controlling the matching of the mask moving speed and deposition rate, and obtains a high-quality polarized metal thin film with a room temperature resistivity as low as 173 μΩ·cm and stability across the entire temperature range by systematically optimizing key process parameters. This method has the advantages of high repeatability, high control precision, and wide applicability, and can be extended to the preparation of other perovskite oxide thin films, showing broad application prospects in the field of polarized electronic devices.

The present disclosure relates to reducing reflection of transparent solids using laser, coatings and devices employing transparent solids. Methods and apparatus for reducing reflections of a transparent solid in a spectrum using a laser, coatings and apparatuses using a transparent solid are disclosed. The laser is used to shape the surface of the transparent solid material by raising the temperature of the material near the melting temperature, thereby creating a desired target nanostructured two-dimensional anti-reflective pattern array on the surface. A laser energy density value, wavelength, repetition rate, pulse duration, and number of consecutive laser pulses per focal spot are selected and a desired focal spot distribution on the surface of the transparent solid material is determined. Transparent solid materials are relatively translated to generate a desired array of nanostructured two-dimensional patterns.

Systems and methods for simulating laser energy density simulate a laser treatment process to be performed on a part by a laser processing system and determine simulated energy density values ​​at points on the surface of the part to be treated. The simulated energy density value is determined at each point on the surface of the part to be treated by virtually measuring the light distance to each point and the light angle at each point during the simulation of the laser treatment process. The light distance and light angle are virtually measured based on the origin of the light rays associated with an optical assembly used to deliver the laser to the surface. The optical assembly may include a scanning optics assembly that scans the laser beam on the surface or a projection optics assembly that projects the laser beam onto the surface. The simulated energy density value determined by the simulation can be used to optimize the actual laser treatment process.

The invention discloses a nanosecond laser precision machining method for a SiCf / SiC composite material, and belongs to the field of laser machining and advanced composite material manufacturing. The method comprises the following steps: carrying out linear ablation or surface ablation on a pretreated SiCf / SiC composite material by adopting nanosecond pulse laser with the wavelength of 355 nm; the laser energy density, the scanning speed, the scanning times, the line overlapping ratio and the scanning path are optimized through the system, and high-precision and low-damage machining is achieved. The core optimization parameters are as follows: the laser energy density is 5.33 J / cm < 2 >, the scanning speed is 200mm / s, the line overlapping rate is 66.58%, and a one-way scanning mode is adopted. Through the combination of experiments and simulation, the mechanism (melting, evaporation, decomposition, and material removal by liquid drop splashing and gas volatilization) of nanosecond laser ablation of SiCf / SiC is disclosed, the heat affected zone, the oxidation phenomenon and the recondensate defect are effectively controlled, the quality and the contour precision of the machined surface are remarkably improved, and the machining precision is improved. The method is suitable for micromachining of key components such as aerospace engine hot end components and medical high-end equipment.

The invention discloses a gradient heterostructure zinc alloy implant and a laser additive preparation method thereof, and the method comprises the following steps: firstly, constructing a three-dimensional model of a gradient heterostructure, and introducing the three-dimensional model into a selective laser melting system after layered slicing treatment; a slice layer is used as a regulation and control unit, and dynamic parameter switching is carried out in an optimized laser energy density range: high laser energy density promotes growth of coarse grains by improving thermodynamic conditions of a molten pool, and low laser energy density realizes regulation and control of fine grains by rapid cooling; and finally, a gradient heterostructure with periodical alternation of coarse and fine crystal layers is formed. Results show that the gradient heterostructure zinc alloy implant shows synergistic improvement of strength and ductility, and the strengthening mechanism of the gradient heterostructure zinc alloy implant mainly originates from comprehensive effects of stress caused by non-uniform deformation, interlayer dislocation and strain localization inhibition of a thick and thin grain alternating layer. In addition, the implant also shows an excellent gradient antibacterial effect. A feasible strategy is provided for design and development of the high-performance zinc alloy implant.

The invention discloses a SrTaO3 electrochromic film and a preparation method and application thereof, and belongs to the technical field of electrochromic film devices and application. The preparation method of the SrTaO3 electrochromic film comprises the following steps: taking Sr2Ta2O7 polycrystalline ceramic as a target material, and preparing the SrTaO3 electrochromic film by adopting a pulsed laser deposition method under the condition that the laser energy density is 0.7-0.9 J / cm < 2 >. The warm-tone electrochromic material is prepared according to the method disclosed by the invention. The SrTaO3 electrochromic film prepared by the method has a flat atomic scale surface and good crystallinity, can be subjected to cathode or anode electrolysis in a Na2CO3 solution so as to present different colors corresponding to different transmittance and resistivity, and has application potential of constructing an electrochromic device.

This invention relates to the field of laser technology, specifically to a solid-gas hybrid laser device, a solid-gas hybrid laser output method, and an exposure apparatus. The solid-gas hybrid laser device includes: a laser output module that outputs a seed laser; a focusing component that receives and focuses the seed laser; and a laser amplification module that receives the focused laser and amplifies its energy. This application employs the above technical solution. Because the energy density of the seed laser is relatively low, a typical laser amplification module requires the seed laser's energy density to exceed a certain energy density threshold to function effectively. This application utilizes the focusing effect of the focusing component to increase the energy density of the seed laser entering the laser amplification module, making it easier to reach the laser amplification module's energy density threshold. This adapts to the laser amplification module's requirements for amplification conditions and reliably achieves the amplification function of the laser amplification module.

The invention discloses a metal workpiece surface crack repairing method and device based on a continuous laser polishing technology, belongs to the technical field of metal repairing engineering, and realizes selective cladding and metallurgical bonding of a crack area and synchronous completion of crack filling and surface strengthening by accurately controlling laser energy density and heat input under the protection of inert gas. The core scheme comprises the following steps: 1) performing three-dimensional scanning positioning on cracks; 2) laser-powder synchronous coupling repair; and (3) gradient annealing is performed to control residual stress. Laser polishing parameters are determined according to the crack filling depth equation, the surface flatness is controlled in combination with a molten pool oscillation equation, and the stability of a molten pool formed by metal liquid after laser polishing of metal is evaluated and calculated. And after polishing, observing under an electron microscope, and monitoring whether the surface hardness after polishing reaches the standard or not through a hardness control model. And then, a thermal-mechanical coupling model is adopted to predict the magnitude of residual stress generated in the laser repairing process, and a theoretical basis is provided for gradient annealing process parameters.

The invention discloses a precise regulation and control method for the size of a micro-nano structure prepared on the surface of a semiconductor, and the method comprises the steps: combing the initial damage size distribution rule of a laser-induced semiconductor material with different incident laser energy, and combining with the analysis of the damage growth coefficient relation of each initial damage under the subsequent irradiation of different incident laser energy densities; the method comprises the following steps: summarizing damage growth thresholds of different-size initial damages of various semiconductors under irradiation of different laser parameters, and finally obtaining a corresponding semiconductor surface micro-nano structure processing scheme and a micro-nano structure size precise regulation effect according to the processing requirements of the semiconductor surface micro-nano structure preparation size. The machining precision and quality of the whole semiconductor surface are improved, preparation of semiconductor surface micro-nano structures with different size requirements is achieved, and application of related fields is expanded.

The present invention belongs to the field of additive manufacturing technology, and in particular, is a method for predicting the diameter of a strut in an additively manufactured lattice structure. The operating steps are as follows: S1. Selecting additive manufacturing process parameters to manufacture a lattice structure. This prediction method, by providing a method for rapidly predicting the diameter of a strut in an additively manufactured titanium alloy lattice structure, only requires statistically analyzing the diameters of the struts in the titanium alloy lattice structure manufactured under several different process parameters. This method can then, according to the method provided by the present invention, fit a relationship formula to achieve prediction of the diameter of the struts in the additively manufactured titanium alloy lattice structure under any process parameters. The proposed formula is only related to laser energy density and has the advantages of being simple in form and having fewer parameters. This formula can solve the problem of predicting the diameter of the struts in the lattice structure manufactured under different process parameters using the same material, especially for lattice structures manufactured using the same material.

The invention discloses a wafer ultrasonic cleaning method, a cleaning device and an automatic system, and relates to the technical field of semiconductor manufacturing, and the method comprises the following steps: 1, generating a medium-temperature liquid water environment of vertical laminar flow in a cleaning fluid flow channel; 2, liquid water is scanned through laser to form a three-dimensional cavitation area, and cavitation bubble flow is generated; 3, dynamically adjusting a laser energy density distribution curve, and controlling the size and density of cavitation bubbles; 4, customizing a bubble collapse energy curve based on the cleaning stage, and removing pollutants with different particle sizes in stages; and 5, discharging pollutants through laminar overflow. The cleaning device is used for implementing the method, and the automatic system comprises the cleaning device. Ideal thermodynamic conditions are created for the cavitation effect through the medium-temperature laminar flow environment; a multi-scale mixed bubble group is generated in single scanning through laser cavitation dynamic regulation and control, so that macroscopic stripping of large bubbles and microcosmic removal of small bubbles are efficiently coordinated; and a pollutant re-adsorption path is blocked through directional pollution discharge of overflow.

The invention discloses a numerical simulation method and system for continuous laser irradiation of 7075 aluminum alloy under the action of an external load based on a modified Johnson-cook model. According to the scheme, on the basis of the heat conduction principle and an elastic-plastic model, a heat-force coupling model of the continuous laser irradiation 7075 aluminum alloy is established through a finite element method; through continuous laser irradiation and tensile experiments, the effectiveness of the numerical simulation model of the continuous laser irradiation spaceflight-grade high-strength 7075 aluminum alloy under the action of the external load is verified; the laser energy density, the light spot pattern and the external load are imported into the model by adding vdflux and vuamp programs written by a Fortran language, and a correction factor function is added for regulation and calculation. According to the method, a correction factor function is adjusted in a Fortran program along with working conditions to ensure that stress field distribution, temperature field distribution and plate deformation conditions of the high-strength aluminum alloy under the combined action of laser and an external load are flexibly and accurately simulated.

The invention discloses a preparation method of a thin film micro-diode and the thin film micro-diode, which are applied to the technical field of micro-diodes, and comprises the following steps: setting a nano patterned substrate; the nano patterned substrate is provided with a top layer part and a bottom layer part based on the arranged nano columns, and the difference value between the energy density of laser irradiated to the top layer part based on the laser lift-off process and the energy density of laser irradiated to the bottom layer part does not exceed 80% of the laser energy density; epitaxially growing a GaN-based LED structure on the surface, provided with the nano columns, of the nano patterned substrate; and irradiating the nano patterned substrate by using laser based on a laser lift-off process, and separating the nano patterned substrate from the GaN-based LED structure. By using the nano patterned substrate, the GaN-based LED structure can have relatively high light emitting efficiency. And the stripping yield in the laser stripping process can be remarkably improved by regulating and controlling the energy density difference of the laser irradiated on the top layer part and the bottom layer part of the nano patterned substrate in the laser stripping process.

This invention discloses a supportless additive manufacturing method for extreme horizontal overhanging structures. The horizontal overhanging region is divided into three areas using different laser control strategies: an initial overhanging region, a low-heat-input region, and a high-heat-input region. The initial overhanging region is used to establish a stable initial overhanging structure; the low-heat-input region is used to suppress thermal stress accumulation and warping; and the high-heat-input region is used to improve the strength of the overhanging structure and repair internal defects. This invention achieves warping-free, complete printing of horizontal overhanging structures, significantly improving manufacturing efficiency and the design freedom for complex structures. Furthermore, corresponding energy control strategies for the low-heat-input and high-heat-input regions are provided for the initial overhanging region using different laser energy densities, broadening the process window for supportless printing of overhanging structures.

The invention discloses an additive manufacturing method for enhancing multi-material interface bonding through a transition heterostructure, and the method comprises the steps: planning an interface part of the multi-material heterostructure into two forming sub-regions which respectively comprise a plurality of forming lattice points, and the two forming sub-regions correspond to a first forming sub-region and a second forming sub-region; each forming lattice point of the first forming sub-region and each forming lattice point of the second forming sub-region are distributed in a staggered manner to form a checkerboard; when each forming layer of the interface part is manufactured through laser additive manufacturing, the first forming sub-area is formed through laser melting, then the second forming sub-area is formed through laser melting, and meanwhile the laser energy density adopted for forming the first forming sub-area through laser melting is higher than the laser energy density adopted for forming the second forming sub-area through laser melting. Therefore, the problems that interface metallurgical bonding is poor, the number of brittle intermetallic compounds is large, and cracks are generated due to too large stress are solved, and crack-free, high-density and high-bonding-strength titanium alloy-aluminum alloy heterogeneous material laser additive manufacturing forming is achieved.

Disclosed are a heating device and method for heating a to-be-processed semiconductor substrate in a laser annealing process, a laser annealing device and method using same, and a semiconductor device manufacturing device and method. The heating device disclosed herein is for heating a to-be-processed semiconductor substrate in a laser annealing process by using a laser. The heating device may be configured to heat the to-be-processed semiconductor substrate loaded thereon and differently control the heating temperature according to the region of the to-be-processed semiconductor substrate. The heating device may be configured to control so that the temperature of a region having a relatively low laser energy density in the to-be-processed semiconductor substrate is higher than the temperature of a region having a relatively high laser energy density in the to-be-processed semiconductor substrate.

The invention belongs to the technical field of engineering and theoretical research of a laser shock technology, and particularly relates to a laser shock micro-mesoscale simulation method for a benchmarking experiment, which is suitable for simulation research of laser shock and comprises the following steps: determining laser energy density I0 of laser shock of the benchmarking experiment; calculating the energy density I of shock waves generated by the laser shock material; calculating the equivalent piston speed UP of the induced shock wave; and performing simulation by taking the equivalent piston speed UP as a boundary condition. According to the invention, the simulation boundary conditions can be conveniently and accurately corresponding to the experimental parameters, so that the simulation accuracy is improved; material parameters involved in the parameter conversion process can be obtained through various low-cost modes such as a high-speed impact experiment and simulation, and it is avoided that pressure field distribution is determined directly through an expensive laser impact experiment; the method is high in portability and suitable for micro-mesoscale laser shock simulation of any platform.

This invention relates to a 3D printing additive manufacturing method for die-casting mold steel metal powder. The metal powder has the following mass percentage content: carbon: 0.20-0.28%, silicon: <0.1%, manganese: 0.20-0.5%, molybdenum: 1.30-1.80%, chromium: 1.50-2.50%, vanadium: 0.10-0.50%, tungsten: 0.3-0.6%, nickel: 2.00-3.00%, copper: 0.80-1.00%, sulfur: ≤0.02%, phosphorus ≤0.025%, oxygen ≤0.025%, with the remainder being Fe and unavoidable impurities. The additive manufacturing method employs selective laser melting, with a laser power of 200W-320W, a laser scanning speed of 800-1100mm / s, a scanning spacing ≤0.1mm, and a laser energy density of 68.17-127.08J / mm². 3 The powder layer thickness is ≤0.03mm, the scanning strategy is 65~70°, and the substrate preheating temperature is 120~150℃ to obtain the alloy. Its beneficial effects are: through alloy composition design and selective laser melting, the prepared alloy exhibits low crack sensitivity and high thermal conductivity, achieving a dual improvement in strength and toughness. It ensures the formation of high-toughness, low-expansion lath martensite, providing excellent toughness while possessing extremely good weldability and being less prone to cracking.

The application belongs to the technical field of additive manufacturing titanium alloy, and particularly relates to a heat treatment method of additive manufacturing Ti-Zr alloy for dentistry. The Ti-Zr alloy is Ti-15Zr alloy after annealing treatment and additive manufacturing; the additive manufacturing comprises an SLM process, and SLM forming parameters are as follows: laser energy density is 100-110 J / mm 3 , laser power is 180-210 W, scanning speed is 800-1200 mm / s, scanning interval is 0.07-0.09 mm, and powder layer thickness is 0.02-0.04 mm. The annealing treatment temperature is 780-820 DEG C, the holding time is 25-35 min, and the product is obtained through water quenching. The ultimate tensile strength of the obtained product is 1265-1275 MPa, the yield strength is 1015-1020 MPa, and the elongation is 10.6-10.7%. The application has simple and controllable process, high efficiency, and excellent product performance, and is convenient for large-scale industrial application.

The application discloses a laser remanufacturing repair method for metal shaft parts, and relates to the technical field of laser repair.The method comprises the following steps: placing a target shaft part to be repaired on a workbench, performing repair processing on a cladding area of the target shaft part by using flat-top light, obtaining a repaired shaft part, and adjusting the focal depth length of the flat-top light in real time by using an external optical device; and stopping the repair operation after detecting that the size of the repaired shaft part meets the preset required size.The application achieves the technical effect of making the laser energy density distribution uniform and improving the fatigue resistance of the shaft part and the consistency of the overall repair quality.

The application discloses a kind of copper electrode laser curing system and method of TOPCon solar cell, the system includes mid-infrared laser generation module, beam shaping and energy management module, precision motion and positioning platform and synchronous control and monitoring module.The method used is: after coating copper paste on the back silver seed layer of TOPCon battery, laser beam is irradiated, by accurately controlling laser energy density and pulse width, energy is selectively resonant absorbed by copper paste organic matter, millisecond level rapid curing is realized, while ensuring that energy density is lower than the damage threshold of lower layer aluminum oxide / silicon nitride passivation film, so that the base temperature rise is lower than 200 DEG C.The application overcomes the defects of traditional thermal curing, such as low efficiency, high energy consumption and easy damage to passivation layer, and provides an efficient, reliable and non-damage battery performance industrialization solution for TOPCon battery low-cost "de-silverization".

The application discloses a kind of laser precision machining silicon carbide surface regulation and control method, by testing the ablation area after laser processing silicon carbide surface and corresponding Raman spectrum change, the carbonization effect of silicon carbide surface after laser processing and ablation boundary are calibrated, in combination with spatial resolution method obtains the related threshold value of the surface carbonization and ablation of various silicon carbide crystals under different parameters laser irradiation, and can be according to ablation and carbonization processing size demand, obtains corresponding incident laser energy density and incident laser light intensity, to realize laser precision, controllable processing various silicon carbide surface ablation and carbonization size, improve processing precision and quality, can be according to demand to realize the precision machining of different demand, provide reliable processing scheme for expanding the application of silicon carbide.

The present application relates to the field of precision laser processing and new energy battery manufacturing technology, specifically to a battery laser cutting heat affected zone optimization method, comprising: parameter mapping coding unit, receiving material physical property parameters and laser energy density instruction, converting physical working condition into fluid mechanics state vector; Thixotropy operator calculation unit, real-time monitoring of virtual strain front, solving the stress offset item for physical inhibition of heat diffusion in reverse; Dynamic tensor damper unit, receiving stress offset item; MOPA laser execution unit, responding to time domain shaping instruction, while executing cutting, using perturbation signal to destroy plasma shielding layer to form a virtual cold ring with high thermal resistance; The present application overcomes the feedback lag caused by the limitation of sampling frequency in traditional infrared monitoring, and realizes the microsecond level active defense of the heat affected zone.

The present application relates to laser ultrasonic nondestructive testing technical field, specifically to a kind of based on ultrasonic signal amplitude judgment material laser ablation threshold method.The present application uses pulsed laser to irradiate the surface of material to be measured multiple times with energy lower than reference ablation threshold, obtains reference signal by laser vibrometer acquisition ultrasonic displacement time domain signal and average, extracts reference amplitude;According to preset energy step, gradually increase the energy of pulsed laser to form multiple energy levels, corresponding ultrasonic displacement time domain signal is collected;After band-pass filtering, detrending and normalization processing to signal, extract maximum peak-peak value, calculate the drop coefficient of each energy level average amplitude relative to reference amplitude;When first appear continuously three energy levels drop coefficient are all greater than preset threshold, the laser energy density corresponding to the minimum energy level among them is determined as laser ablation threshold.The present application only needs conventional laser vibrometer, without destructive observation afterwards, calibration is fast and accurate.

The utility model discloses a superhard PCD cutter based on laser cutting process optimization, which comprises a length shell, the top end of the length shell is connected with a screw rod in a sliding manner, the top end of the screw rod is provided with an assembly head, the top end of the assembly head is fixedly provided with a cutter bar, the top end of the cutter bar is fixedly provided with a cutter head, and the length shell is internally provided with a lifting assembly. According to the ultrahard PCD cutter optimized based on the laser cutting technology, the cutter head is composed of the base block and the outer shell, the laser energy density distribution is optimized, the cutting efficiency is improved, the cutting efficiency is improved, and the cutting quality is improved. The cutting heat input is matched with the thermal expansion coefficient of the gradient transition layer, the interface stress concentration is reduced, the strength is high, and the service life of the tool bit is prolonged; a base block is made of WC-10% Co hard alloy, a shell is made of diamond with the particle size of 5 micrometers and 8% SiC binding agents, the sintering pressure is 5.5 GPa, the temperature is 1450 DEG C, the hardness is high, and systematic laser machining is facilitated.

The invention provides a biochar core composite material and a preparation method and application thereof, the biochar core composite material is composed of a hollow mesoporous biochar core (HMB), a biological siloxane shell layer (Si-shell) and a phase change layer (PCM), and the chemical formula is Si-HMB-C-PCM. The composite material provided by the invention has extremely high photo-thermal conversion rate, the photo-thermal conversion rate is 85-95% in the near-infrared band of 808-1064 nm, the laser energy density required by etching is greatly reduced, and the required laser energy density is 0.45 J / cm; the etching precision and speed are greatly improved, the minimum line width capable of being etched is 10 microns, and the marking speed (100% contrast ratio) reaches 800 mm / s; according to the present invention, the film has characteristics of excellent thermal control and excellent environmental protection, the thermal diffusion region during etching is less than 20 [mu] m, and the biodegradation rate (ISO 14855, 90d) is more than 95%.