40 results about "Metal lattice" patented technology

A paddle includes a core and at least one metallic lattice structure coupled to the core.

Inventive techniques for forming unique compositions of matter are disclosed, as well as associated physical characteristics and properties of the materials. In particular, particles comprising a metal lattice are characterized by having carbon (preferably graphene) disposed within the crystalline lattice structure thereof. The carbon is at least partially disposed in interstitial sites of the metal lattice, and may be present in amounts ranging from about 15 wt % to about 90 wt % of the total particle mass, with about 15 wt % to about 60 wt % being disposed in the interstitial sites, e.g., between basal planes, of the metal lattice. The carbon, moreover, is substantially homogeneously dispersed throughout the resultant material, conveying unique and advantageous properties such as strength-to-weight ratio, density, mechanical toughness, sheer strength, flex strength, hardness, anti-corrosiveness, electrical and / or thermal conductivity, etc. as described herein. In some approaches, the graphene is pristine, and has corresponding physical characteristics as described herein.

The invention provides a method and a device for testing hydrogen doping of a buried steel pipe under a cathode protection condition. The method and the device solve the technical problem that an internal hydrogen permeation-external hydrogen adsorption synergistic effect mechanism faced by a buried pipeline cannot be reflected in an existing test. The method comprises the following steps: establishing a dual test environment under a cathode protection condition, forming a control group and an experimental group of a corrosion test piece to be tested, deploying the control group in a single soil environment, and deploying the experimental group in internal and external hydrogen environments; the power-on potential and the power-off potential are continuously monitored in the dual test process; quantitative comparison of key parameters of the control group and the experimental group is formed according to the double test periods; and constructing a multiple regression model according to the key parameters in combination with potential correction data to quantify the correlation between the corrosion rate and the hydrogen embrittlement sensitivity. The double-environment coupling effect in the actual operation of the pipeline is synchronously simulated, and the diffusion path difference of hydrogen atoms in metal lattices and the influence of double-environment superposition on the corrosion rate are more truly reflected.

The present application relates to the technical field of power hardware processing and manufacturing, and particularly relates to a cross arm production process. The process comprises: after a fluid-incompressible pressure-maintaining rigid boundary is constructed by pressing a main hydraulic cylinder, starting a microseismic device to directionally inject high-frequency mechanical microseismic kinetic energy into the cross arm; synchronously extracting a back pressure feedback value in a sealed loop and monitoring a dynamic attenuation slope thereof in real time; when the slope is detected to be flat and to be in an attenuation stagnation of internal stress release, under a timing safety interlock protection mechanism for executing confirmation of mechanical wave calming, triggering a high-frequency electrically-controlled proportional overflow valve to execute millisecond-level transient micro-pressure relief and extremely fast pressure reconstruction, so as to provide a transient volume yielding space for metal lattice rearrangement; and finally completing final state confirmation when the absolute value of the back pressure is stabilized at a zero rebound threshold. The present application can solve or at least alleviate the secondary rebound problem caused by lattice distortion residual strain energy accumulation in the forming of thick-walled metal components, and improve the production quality of the cross arm.

The invention discloses an aluminum-based conducting bar surface functional layer and a preparation system and process thereof. The preparation process comprises the following steps: substrate pretreatment: removing surface pollutants through ethanol ultrasonic cleaning; preparing a transition layer: performing cold solid deposition on the copper-based composite powder to form the transition layer; functional layer cold spraying: constructing a functional conductive layer on the surface of the transition layer; preparing an anti-corrosion layer: constructing a composite protection system on the surface of the functional conductive layer; densification treatment is conducted, specifically, hole sealing densification treatment is conducted on the surface of the anti-corrosion layer; and detecting the quality of the coating. The functional layer comprises an aluminum-based layer, a copper metal transition layer, a nickel-based or tin-based conductive layer and an anticorrosive layer. By adopting the process, the equipment investment can be saved, the processing time can be saved, the metal lattice distortion can be effectively realized, the accurate control of the dislocation density of the material surface can be realized, the specific strength of the conducting bar material can be improved, and the light weight of the conducting bar can be realized.

The invention discloses copper alloy powder and a method for conducting printing repair on an aluminum bronze workpiece through the copper alloy powder, and belongs to the technical field of alloys and repair of the alloys. The alloy comprises 25-32% of Ni, 12-17% of Co, less than or equal to 1.8% of Mn and less than or equal to 2% of Si. O is less than or equal to 0.03%, and the balance is Cu. By preferably increasing the contents of Ni and Co elements, the wear resistance of the repaired surface and the bonding performance between the matrix and the additive repair layer are improved while the safety in the large-batch preparation and use process of the powder is ensured. The proportion of nickel and cobalt in the alloy is increased, the strength and hardness of the copper alloy can be improved, the nickel and the cobalt hinder dislocation movement in metal lattices through different micromechanisms, in other words, the nickel plays a role through solid solution strengthening, and the cobalt plays a role through precipitation strengthening.

The invention discloses a preparation method of a GaN single crystal film on a high thermal conductivity substrate, and belongs to the field of semiconductor film materials. Two-dimensional boron nitride is introduced as a functional layer, and low-temperature nucleation and high-temperature epitaxy processes are combined, so that high-quality combination of the single-crystal AlN transition layer with metal lattice polarity and the heat dissipation substrate is realized, the interface thermal resistance brought by a traditional bonding technology is effectively reduced, and the overall heat dissipation efficiency is improved; by means of the AlON lattice polarity inversion layer and the regrowth process, controllable conversion from nitrogen lattice polarity to metal lattice polarity is successfully achieved, the component gradual change structure and the dislocation filtering layer design are combined, the dislocation density in the thin film is remarkably reduced, and the crystallization quality of the material is improved. The method has the advantages of low epitaxial structure complexity, low process difficulty and clear and controllable process path, and is suitable for large-scale preparation. The method has important application potential in the high-end technical fields of electric automobiles, efficient energy conversion, advanced display, communication systems and the like.

The invention relates to a metal dot matrix 3D printing system and method based on electromagnetic-thermocompression coupling adsorption. The invention relates to the technical field of metal additive manufacturing, in particular to a 3D printing system integrating imprinting welding adsorption characteristics and hot-pressing deposition, and is suitable for high-precision scenes such as microelectronic devices and space on-orbit manufacturing. The technical problems that due to the fact that traditional metal 3D printing depends on gravity powder laying, the microstructure precision is low (gt; 100 microns), and the welding process and the printing process are separated are solved.

The invention discloses an assembly type double-layer cambered-surface metal dot matrix sandwich panel concrete member which comprises a double-layer cambered-surface metal dot matrix sandwich panel and concrete filled in the double-layer cambered-surface metal dot matrix sandwich panel, and dovetail mortises and tenons are manufactured in the middles of the two axial sides of the double-layer cambered-surface metal dot matrix sandwich panel respectively. Mortises and tenons are manufactured in the middles of the upper end face and the lower end face of the double-layer cambered surface metal dot matrix sandwich panel in the circumferential direction respectively, the cambered surface perimeter of the double-layer cambered surface metal dot matrix sandwich panel concrete member is determined according to the fact that a whole circle with the same radius is equally divided into a plurality of parts, and the dovetail mortises and tenons on the side faces of the double-layer cambered surface metal dot matrix sandwich panel concrete member are spliced into a whole cylinder. According to the double-layer cambered surface metal dot matrix sandwich panel concrete member, the structure is simple, on-site welding, steel bar binding and concrete pouring are not needed, staggered joint assembling construction is convenient and fast, installation is rapid and efficient, and the construction efficiency is improved. The connection strength is high, and stress is continuous and reliable.

The invention discloses a preparation method of an etching solution, a photovoltaic printing screen and an etching preparation method thereof, and the preparation method of the etching solution comprises the following steps: under a preset stirring condition, mixing deionized water with tallow alkyl propane diamine, and stirring to a uniform state to obtain a target solvent; sequentially adding nitric acid, hydrofluoric acid and phosphoric acid into a target solvent according to a first preset mode to obtain a first solution; according to a second preset mode, at least one corrosion-resistant additive is added into the first solution, and a second solution is obtained; and according to a third preset mode, a lattice refiner is added into the second solution, and the etching liquid is obtained. According to the technical scheme, it can be guaranteed that the thinned screen has high-precision surface quality, it is guaranteed that the metal lattice size of the thinned screen is refined, the material advantages of stainless steel such as 304 stainless steel are fully played, the tensile strength and corrosion resistance of the screen are improved, and the service life of the screen is prolonged.

The utility model discloses a UHPC and honeycomb bridge pier composite ship collision prevention device which comprises an anti-collision box, an assembly inner cavity for containing an energy dissipation structure is formed in the anti-collision box, a steel lattice for dividing the inner space of the assembly inner cavity is arranged in the assembly inner cavity, and aluminum honeycomb plates connected in series and in parallel are arranged in the steel lattice. The steel lattice and the aluminum honeycomb plate form a combined energy dissipation structure. According to the series and parallel aluminum honeycomb plate-steel lattice combined structure, the defects that a single honeycomb structure is small in size and low in total energy consumption are overcome, and the high energy absorption efficiency of the honeycomb structure and the unbalance loading resistance of a metal grid structure are coupled; and the energy absorption effect on anti-collision scenes caused by different ship tonnages, different ship bow shapes and different collision directions and angles is good. According to the utility model, a series and parallel aluminum honeycomb panel-steel lattice combined structure is adopted as an energy dissipation structure, and the structure is stable in failure mode, strong in energy dissipation capacity, clear in force transmission path and controllable in design under dynamic impact compression.

Metal(s) (including various alloys, such as INCONEL® superalloys) are characterized by having carbon disposed within the metal lattice structure thereof. The carbon is primarily, or entirely, present at interstitial sites of the metal lattice, and may be present in amounts ranging from about 1.5 wt % to about 90 wt %. Carbon may be present in the form of graphene, which may be characterized as one or more coherent, planar layers of graphene. The carbon, moreover, forms non-polar covalent bonds with both metal atoms of the lattice and other carbon atoms present in the lattice. This facilitates substantially homogeneous dispersal of the carbon throughout the resultant material, conveying unique and advantageous properties such as strength-to-weight ratio, density, mechanical toughness, sheer strength, flex strength, hardness, anti-corrosiveness, electrical and / or thermal conductivity, etc. as described herein. In some approaches, the composition of matter may be powderized, or the powder may be pelletized.

The invention relates to a double-site substituted bismuth-based oxyhalide solid solution as well as a preparation method and application thereof. The structural formula of the solid solution is Bi < 2 > Y < 1-x > Gd < x > O < 4 > Cl < 1-y > Bry, wherein x is greater than or equal to 0.1 and less than or equal to 0.9, 0 lt; y < lt >; 1; the preparation method comprises the following steps: modifying Bi2YO4Cl, carrying out controllable partial substitution on a metal lattice site (Y3 +) by using a specific metal cation (Gd < 3 + >) and carrying out controllable partial substitution on a halogen lattice site (Cl-) by using a specific halogen anion (Br-) at the same time to construct a double-site substituted solid solution, and carrying out collaborative optimization on charge separation efficiency and water oxidation performance of the material by using double-site partial substitution. The preparation method provided by the invention provides reliable technical support for industrial application of the Bi2YO4Cl-based photocatalytic material.

The invention belongs to the technical field of surface plasmons, and discloses a low-loss SPP design method based on anisotropic stretched metal. The loss is accurately regulated and controlled through electron density dilution in different directions inside and outside the plane, so that the previous thought of reducing the electron body density of the material does not need to be continued. The theoretical limit of the waveguide loss of the SPP provided by the invention can be reduced to 50% of the original unstretched crystal lattice; according to the invention, the high-index single crystal copper can be used as a representative of an anisotropic stretching metal system, the restriction of a conventional metal lattice with a low-index crystal face exposed is broken through a pre-oxidation-reduction method, the copper single crystal with the high-index crystal face exposed is prepared, and relatively stable Cu (332) is taken as an example to prove that the dielectric imaginary part of the copper single crystal is lower than that of precious metal Ag of the same type, so that the copper single crystal with the high-index crystal face exposed is prepared. And the method can be compared with the lowest-loss alkali metal Na measured in the current experiment. In addition, periodic coupling grating structure design is carried out on Cu (332) to achieve SPP excitation, and the near-infrared propagation length of the Cu (332) can be measured to reach the hundred-micron level.

A liquid transport and storage container and method for modifying a transport and storage container having a pallet-type understructure for a plastic inner container having a closeable filling nozzle on an upper bottom and a discharge nozzle on a lower section of a lateral wall with a dispensing fitting and a lattice jacket having horizontal and vertical metal lattice struts for receiving the inner container, ends of the vertical lattice struts having a hollow profile welded to lower and upper circumferential edge profiles of the lattice jacket, vertical lattice rods on opposite lateral walls connected by a traverse rod with a hollow profile extending across the upper bottom, a web extending vertically with a through opening formed therein molded on the upper bottom, the traverse rod extending through the through opening. A filling element is in a movement-free space between the through opening and the traverse rod.

A hollow metal lattice viscoelastic structure utilizing viscous fluid within a cavity and its preparation method are disclosed, relating to the fields of 3D printing and metallized lattice materials. This invention solves the problem of easy aging and failure of existing viscoelastic materials. Each lattice unit (A) of this invention includes a hollow substrate, on which metallization is performed by chemical plating to form a metal lattice unit; multiple lattice units (A) are interconnected to obtain a hollow metal lattice structure. This hollow metal lattice structure is a piston-shaped or spherical shell-shaped cavity or a composite lattice structure with a spring. During compression, the viscosity is provided by the fluid within the cavity, and the viscoelastic properties are formed by the elasticity of the metal substrate. Step 1: Design the lattice structure; Step 2: The hollow metal lattice structure has a piston-shaped or spherical shell-shaped cavity and a spring structure. During compression, the viscosity is provided by the fluid within the cavity, and the viscoelastic properties are formed by the elasticity of the metal substrate. This invention is used in impact-resistant and vibration-damping environments.

The present disclosure relates to the technical field of aerospace, and discloses a hybrid structure connecting piece for connecting between rocket engine components, which comprises a metal frame, a metal load-bearing structure in the cavity, a metal lattice structure filled in the gap between the metal load-bearing structure and the cavity, and a damping structure filled in the pores of the metal lattice structure. The metal load-bearing structure is made of metal, which can improve the carrying capacity of the connecting piece. The metal lattice structure can reduce the weight of the structure compared with the complete metal structure. The filled damping structure can absorb energy and play a buffering and damping effect. The hybrid structure connecting piece can realize weight reduction and vibration reduction at the connection between the rocket engine components.

The application belongs to the technical field of two-dimensional material preparation, and particularly relates to a method for preparing a multilayer single-crystal graphene film based on a hot-pressing process. Solid carbon material is attached to a single-crystal metal foil substrate, and hot-pressing is performed in a protective gas atmosphere containing a reducing gas to obtain a multilayer single-crystal graphene film. The application uses a single-crystal metal foil as a substrate and solid carbon material as a carbon source to construct a growth model of solid carbon source dissolution-metal mass transfer-surface precipitation, and uses hot-pressing to pyrolyze the carbon source to generate carbon atoms, form a solid solution with the single-crystal metal foil, and use the potential energy difference of the carbon atoms on both sides of the single-crystal metal foil to realize directional transmission of the carbon atoms in the metal lattice and ordered precipitation and growth on the surface to obtain a multilayer single-crystal graphene film with uniform and controllable layers. The method has strong controllability, is easy to implement on a large scale, and provides a new approach for efficient preparation of multilayer single-crystal graphene films.

This invention relates to a programmable thermal protection ceramic-metal lattice superstructure for spacecraft in extreme space environments, belonging to the field of spacecraft thermal protection technology. It comprises multiple body-centered cubic lattice cells arranged periodically in three-dimensional space to form an isotropic three-dimensional network structure. Each body-centered cubic lattice cell includes eight lattice connecting rods, which are rod-shaped structures. The eight connecting rods intersect at a central point, and any two adjacent connecting rods have the same angle relative to the central point, forming a cubic unit configuration body-centered cubic lattice cell. This invention solves the problem of traditional thermal protection structures failing to simultaneously address heat dissipation capacity and thermal shock protection, providing an innovative solution for thermal protection of spacecraft in extreme space environments.

The invention relates to the technical field of metal structure manufacturing and machining equipment, and discloses a steel structural component welding deformation correcting device which comprises a base, a conveying roller set is arranged on the upper portion of the base and used for supporting a lower flange plate of a steel structural component and driving the steel structural component to move along a correcting path, and a synchronous lifting frame is arranged on the outer side of the base and used for lifting the steel structural component. The two lifting ends of the synchronous lifting frame are symmetrically arranged on the two sides of the base, the two lifting ends of the synchronous lifting frame are each provided with a lower supporting assembly, the lower supporting assemblies are used for supporting the lower surface of an upper flange plate and a web plate of a steel structure component, and the top end of the synchronous lifting frame is fixedly connected with a cross beam; and a divergent pulse correction assembly is arranged on the cross beam. A high-frequency excitation system is integrated in the split type roller, metal lattices are softened through the acoustic plastic effect excited by high-energy ultrasound or high-frequency vibration, and the device can achieve large-amplitude plastic deformation only through small mechanical pressing force.

This invention discloses an integrated die-casting machine for aluminum alloy vehicle frames, relating to the field of die-casting equipment technology. It includes a die-casting machine body, with a vibration mechanism for assisting demolding installed on the side of the lower mold body. A lifting mechanism for assisting casting demolding is installed at the bottom of the die-casting machine body. A translation mechanism for pushing the casting away from the mold is installed on the side of the lifting mechanism. A release mechanism for assisting casting lifting is also installed inside the lifting mechanism. By setting up the vibration mechanism, a hammer periodically impacts the side of the lower mold body of the die-casting machine body. High-frequency mechanical vibration reduces the static friction and adhesion between the casting and the mold cavity. Vibration can cause minute displacements in the metal lattice, eliminating stress concentration, thereby improving the fluidity and demolding performance of the casting. This not only reduces mechanical damage to the mold and casting during forced ejection but also reduces demolding resistance, creating conditions for subsequent ejection actions.

The invention relates to the technical field of chip safety protection, and discloses a method for generating a multi-path parallel random path for a top protection layer of a chip, and the method comprises the steps: forming a metal lattice matrix in a to-be-protected region of the chip; planning a path lattice according to the split number M; generating N / M paths; m parallel metal paths are split based on each path, and adjacent metal wires belong to different paths through path splitting, so that the short circuit detection probability is improved, and meanwhile, the complexity of the paths is kept. According to the method, the physical attack resistance of the chip is effectively enhanced, and the method is suitable for the protection layer design of a high-end security chip and has high flexibility, high compatibility and excellent robustness.

An aluminum material, a preparation method thereof, and a bowl-shaped aluminum block are provided in the present disclosure, which relates to the technical field of alloys. Controlling the amount of manganese to 0.03-0.5 wt % in the present disclosure can improve the structure and enhance the impact mechanical properties of aluminum material; nickel can improve the strength and rust resistance of aluminum material, strontium can form an aluminum-strontium combination to adjust the crystal orientation of the metal lattice, which can improve molding and greatly enhance flexibility, and zirconium has a synergistic effect, which can improve the corrosion resistance of aluminum material, and improve surface gloss. The aluminum material provided by the present disclosure has a hardness of 23-30 HB, a tensile strength of 70-100 MPa, a yield strength of 35-59 MPa, and an elongation at break of 40-60%.

The present invention belongs to the technical field of group III oxide thin films and device manufacturing, and relates to a method for preparing a gallium oxide epitaxial layer by using a liquid gallium-based metal. The preparation is carried out by using an ECR-PEMOCVD device. First, a gallium oxynitride buffer layer is prepared on the upper surface of a substrate after hydrogen-nitrogen plasma cleaning. Then, a liquid gallium-based metal lattice is prepared on the upper surface of the gallium oxynitride buffer layer. Next, the upper surface of the gallium oxynitride buffer layer is treated with hydrogen plasma to generate a gallium-rich layer. Furthermore, by utilizing the good wettability between the liquid gallium-based metal and the gallium-rich layer, a continuous and uniformly distributed liquid gallium-based metal layer is formed by self-propagation on the upper surface of the gallium-rich layer. Finally, the upper surface of the liquid gallium-based metal layer is oxidized by oxygen plasma to prepare a gallium oxide epitaxial layer. This method has a low preparation temperature, high crystal quality, can precisely control the thickness of the gallium oxide epitaxial layer and the p-type or n-type doping concentration, and can reduce carbon pollution and improve the carrier mobility.

The application discloses a profile semi-solid horizontal extrusion device and method, and belongs to the semi-solid forming field.The method comprises the following steps: firstly, placing a deformed metal blank in a heating furnace to be heated, and setting the temperature to be 10-20 DEG C higher than the solidus temperature of the metal; and then, feeding the metal into an extruder to be extruded.The deformation heat effect is generated by a conical extrusion cylinder in the extrusion process, and about 5% of the work done by the extrusion rod is stored in the metal lattice in the form of distortion energy, and the rest is all converted into heat.Therefore, in the extrusion cylinder, the solid blank is heated to change into a state of coexistence of solid and liquid phases, i.e., a slurry state.In the slurry state, the deformation energy is introduced into the solid phase crystal grains in the semi-solid slurry through a die, and then, the semi-solid slurry is extruded to be formed, and after water quenching treatment, the metal semi-solid profile is prepared, and the profile is subjected to subsequent heat treatment to obtain a final product.The method has the advantages that the metal profile is prepared by using isothermal treatment and semi-solid extrusion, the technological process is relatively short, the profile can be nearly net formed, the production cost is low, the profile prepared has small grain size and good mechanical properties.

The invention discloses a method for designing a Kelvin tetrakaidecahedron shelling and trepanning and multi-cell local cutting lattice structure based on an SLM additive manufacturing technology, and belongs to the technical field of preparation of a three-dimensional metal lattice structure by selectively melting metal powder through high-energy laser beams. According to the method, a deformed tetrakaidecahedron is constructed by scaling a unit cell prototype at equal proportion and then shelling and trepanning, multi-cell elements under different stacking structures are constructed according to three geometrical characteristics, a lattice structure multi-cell model under three ideal topologies is constructed by utilizing local cutting, and a sample is prepared by virtue of an SLM (selective laser melting) technology additive material. By the adoption of the method, the porosity and the relative density can be regulated and controlled through unit cell scaling and shelling so as to balance the light weight and the stability of the multi-cell lattice structure; a round micropore is formed in the center of the square surface to remove residual powder and keep the hole closing strength; and three types of stacked multi-cell elements are constructed by utilizing geometrical characteristics of the multi-cell elements, and surface defects are repaired through local cutting, so that the mechanical representation trueness of the periodic lattice structure is improved, and the mechanical anisotropy of the multi-cell tissue is explored.

The invention relates to the technical field of cable connectors, in particular to a high-voltage cable power-on and power-off connection structure which comprises a connector body, a first cable and a second cable, a first power-on terminal and a second power-on terminal are arranged in the connector body, the first power-on terminal is in power-on and power-off connection with the first cable, and the second power-on terminal is in power-on and power-off connection with the second cable. The second power connection terminal is in power-on and power-off connection with the second cable; the arc extinguishing device comprises a contact piece, an arc extinguishing grid and a driving piece, the arc extinguishing grid is connected with the driving piece, the arc extinguishing grid is located above the contact piece, the arc extinguishing grid comprises a plurality of metal grid pieces and a plurality of cooling pieces, the metal grid pieces are close to each other, and meanwhile the cooling pieces cool the metal grid pieces. The technical problems that an existing high-voltage cable power-on and power-off connection structure cannot effectively adapt to dynamic fluctuation and instantaneous high heat of an electric arc due to the fact that a fixed-interval arc extinguishing grid and a passive heat dissipation mode are adopted, the arc extinguishing performance is not reliable, and a power connection terminal is prone to burning loss are solved.

The application belongs to the technical field of advanced composite materials and structure engineering, and particularly relates to a lightweight anti-seismic composite material and a preparation method thereof. The material is a sandwich structure, comprising upper and lower panels and an intermediate core layer. The upper and lower panels are composed of a resin matrix and carbon fibers in which metal nanoparticles are in-situ compounded. The intermediate core layer is prepared by laser selective melting or precise sheet metal folding to obtain a negative Poisson's ratio metal lattice core layer and then subjected to surface roughening treatment. A core-shell damping emulsion is prepared on the surface of the core layer by a step-by-step emulsion polymerization method, and a functional damping coating is formed by coating and solidification. The panels and the core layer are compounded and solidified by a vacuum-assisted resin transfer molding process. Through multi-scale collaborative design, the lightweight, high strength, high damping and excellent impact resistance are synergistically optimized, the structure has high integrity and high designability, and is suitable for building seismic mitigation, lightweight transportation and high-end equipment protection.

This invention relates to the field of aerospace materials technology, and discloses a metal lattice structure with a customizable coefficient of thermal expansion and its design method. Each lattice unit cell of the structure is an isosceles triangle composed of two waist elements and a base element. Each element consists of a rhombic frame and a diagonal. Each element is composed of two metal materials: one for the rhombic frame and another for the diagonal. By adjusting the length ratio of the sides and the diagonal of the rhombic frame and the material type, the lattice unit cell can exhibit one of the following characteristics: a negative coefficient of thermal expansion, a zero coefficient of thermal expansion, a positive coefficient of thermal expansion, or an anomalous coefficient of thermal expansion. This allows for a sudden change in the coefficient of thermal expansion near the Curie temperature of a low-expansion alloy, satisfying the customizable thermal expansion requirements of the metal lattice structure.

The application discloses a kind of additive manufacturing lattice structure macroscopic morphology defect type identification methods, comprising: obtaining vertical angle lattice cell image data;The lattice cell image data is calibrated and constructs lattice cell identification dataset, identifies single lattice cell image data;The single lattice cell image data is segmented and constructs lattice cell top arc region segmentation dataset, and four rod top arc regions of lattice cell are segmented out;The four rod top arc regions of lattice cell segmented out are handled, and cell feature information is extracted;Quantification is carried out to the extracted cell feature information, and quantitative index is determined;Based on the quantitative index, the defect type of the lattice cell image data is identified and classified.The application identifies lattice structure defect and quantifies defect type, effectively guarantees the printing quality and mechanical properties of large metal lattice.