295 results about "Negative thermal expansion" patented technology

Provided is a negative thermal expansion material having excellent negative thermal expansion properties and exhibiting a gradual volume decrease with increasing temperature compared with the conventional zinc-phosphorus complex oxide Zn2P2O7 in a temperature range of 100-150°C.　 The negative thermal expansion material is characterized by comprising a zinc-phosphorus complex oxide represented by general formula (1). (1): ZnxCayMpPzOt (In the formula, M represents one or more metal elements selected from among Mg, Zn, Cu, Fe, Cr, Mn, Ni, V, Li, Al, B, Na, K, F, Cl, Br, I, Sr, Ba, Ti, Zr, Hf, Nb, Ta, Y, Yb, Si, S, W, Mo, Co, Bi, Te, Pb, Ag, Cd, In, Sn, Sb, Te, Ga, Ge, La, Ce, Nd, Sm, Eu, Tb, Dy, and Ho; 0<x<2.00; 0<y<2.00; 0≤p≤1.00; 1.70≤z≤2.30; and 6.00≤t≤8.00, provided that 1.70≤x+y+p≤2.30)

Various systems for the containment or delivery of a product are provided. The systems allow for the storage of products at low temperatures and include a container closure inserted into a container (10). The container closure may have an elastomeric body (12) and include a material (14) having a negative coefficient of thermal expansion. In other systems, the material having a negative coefficient of thermal expansion may be inserted between the elastomeric container closure and a seal. Other systems may include an insert at least partially embedded within the elastomeric body of a container closure, an actuator having a distal end movably attached to the insert, and a resilient element between the distal end of the actuator and the insert, wherein the resilient material expands radially upon displacing the distal end of the actuator toward the insert.

An object of the present invention is to provide a negative thermal expansion material having better negative thermal expansion characteristics. The present invention is a negative thermal expansion material, comprising a copper vanadium composite oxide dissolving Li atoms and represented by the following general formula (1):(CuxMy)(VaPb)Ot. In the general formula (1), M represents a metallic element with an atomic number of 11 or more other than Cu and V, 1.60≤x≤2.40, 0.00≤y≤0.40, 1.60≤a≤2.40, 0.00≤b≤0.40, 5.00≤t≤9.00, 1.60≤x+y≤2.40, and 1.60≤a+b≤2.40.

An object of the present invention is to provide a negative thermal expansion material having better negative thermal expansion characteristics. The present invention is a negative thermal expansion material, comprising copper vanadium composite oxide powder dissolving Al atoms and represented by the following general formula (1), CuxMyVzOt (1). In general formula (1), M represents a metallic element with an atomic number of 11 or more other than Cu, V, and Al, 1.60≤x≤2.40, 0.00≤y≤0.40, 1.70≤z≤2.30, 6.00≤t≤9.00, 1.00≤x+y≤3.00, and a molar number of the Al atoms in terms of atoms>a molar number of M atoms in terms of atoms if an M element is contained.

The invention provides a high-stability optical electric field sensor based on a Fabry-Perot structure, and relates to the technical field of electric field sensors, a temperature compensation crystal with a negative thermo-optic coefficient or a negative thermal expansion coefficient is added in a Fabry-Perot resonant cavity to offset the positive thermo-optic effect and the thermal expansion effect of an electro-optical crystal. The device specifically comprises a laser, a polarizer, two groups of reflectors, an electro-optical crystal, a temperature compensation crystal and a photoelectric detector, wherein the laser, the polarizer, the reflecting mirror, the electro-optical crystal, the temperature compensation crystal, the reflecting mirror and the photoelectric detector are sequentially arranged along the direction of a light path, and the two groups of reflecting mirrors form a Fabry-Perot resonant cavity; the polarizer, the two groups of reflectors, the electro-optical crystal and the temperature compensation crystal are packaged into a sensor probe; the sensor probe is connected with the laser and the photoelectric detector through optical fiber jumpers. According to the scheme, the temperature stability of the optical electric field sensor can be improved, and the application scene of the optical electric field sensor is widened.

The invention provides an isogeometric topology optimization method and device based on thermoelastic metamaterial design, and relates to the field of isogeometric topology optimization. The method comprises the following steps: constructing a multi-material interpolation model corresponding to a thermoelastic metamaterial, and obtaining multiple groups of density distributions corresponding to multiple solid materials and one density distribution corresponding to one solid material in a thermoelastic metamaterial design domain according to the multi-material interpolation model; obtaining a relation interpolation among the multiple groups of density distributions, and obtaining an elastic modulus and a thermal expansion coefficient according to the relation interpolation; calculating an equivalent elastic matrix corresponding to the thermoelastic metamaterial according to the elastic modulus, and calculating a thermal expansion coefficient matrix corresponding to the thermoelastic metamaterial according to the thermal expansion coefficient; performing discretization form processing on the calculation equations of the equivalent elastic matrix and the thermal expansion coefficient matrix through an isogeometric grid, constructing a constraint function according to the equivalent elastic matrix, constructing a target function according to the thermal expansion coefficient matrix, and calculating sensitivity information corresponding to the first design variable through the target function and the constraint function; updating the first design variable according to the sensitivity information until the thermal expansion coefficient meets a convergence condition, and acquiring a second design variable meeting the convergence condition through geometric topology design models such as a negative thermal expansion metamaterial; and performing optimization design on the thermoelastic metamaterial according to the second design variable. The problem that when a complex geometric structure is processed, a finite element method is difficult to guarantee efficient and high-precision design of the thermoelastic metamaterial is solved.

The invention belongs to the technical field of electronic packaging materials, and particularly relates to an epoxy resin composite material with a low thermal expansion coefficient, a cured product and application. The epoxy resin composite material with low thermal expansion coefficient, high thermal conductivity and good flowability is prepared by compounding the negative thermal expansion filler, the thermal conductive filler, the epoxy resin and the curing agent through the synergistic effect of the components, so that the epoxy resin composite material has good flowability and filling property during plastic packaging; the packaging operation can be better carried out, the packaging effect is improved, the working stability of electronic components is effectively improved, the working life is prolonged, and the packaging material has wide application prospects in the field of electronic packaging materials.

The utility model belongs to the technical field of propellers, and particularly relates to a ship propeller which comprises a propeller body, a propeller, a connecting rod and a wave suppression plate, a flange plate is fixedly connected to the top end of the connecting rod, a through hole is formed in the flange plate, a wiring channel is formed in the connecting rod, and two annular grooves are formed in the top end of the flange plate. The inner walls of the two annular grooves are fixedly connected with rubber sealing rings and annular wrapping bags correspondingly, and the annular wrapping bags are filled with negative thermal expansion filler. The negative thermal expansion filler and the rubber sealing ring are expanded at different temperatures, so that the sealing performance between the flange plate and the ship body flange is improved, and the sealing performance between the flange plate and the ship body flange can always keep stable high sealing performance in different periods; water is prevented from entering the ship body and the wiring channel due to a gap between the flange plate and the ship body flange, and the situation that the line and the propeller body are damaged due to water immersion is prevented.

The invention provides a diamond and negative expansion particle reinforced aluminum matrix composite and a preparation method, and belongs to the technical field of composites. The aluminum-based composite material is composed of a diamond phase and a negative thermal expansion phase which are dispersed in an aluminum matrix. The average particle size of the diamond phase is 10-1000 [mu] m, and the ratio of the average particle size of the diamond phase to the average particle size of the negative thermal expansion particles is 10-20; the particle size of the negative thermal expansion particles adjacent to the diamond phase is smaller than that of the negative thermal expansion particles away from the diamond phase. The diamond and negative expansion particle reinforced aluminum-based composite material with excellent thermophysical performance is obtained by regulating and controlling the volume fraction of the diamond and the negative expansion particles, the thermal expansion coefficient matched with a semiconductor material is prepared through a collaborative optimization strategy, and the diamond and negative expansion particle reinforced aluminum-based composite material is applied to the field of electronic packaging heat dissipation materials.

A deformation-driven additive manufacturing method for a low-interfacial-stress aluminum-steel composite structure comprises the steps that an aluminum alloy thin tube is filled with an adding phase with a low thermal expansion coefficient or a negative thermal expansion coefficient and aluminum-silicon powder used for enhancing the thermal plasticizing fluidity of a raw material wire according to the proportion, and after drying treatment, the raw material wire for adjusting the thermal expansion coefficient is manufactured; a continuous wire feeding friction stir additive manufacturing method is adopted, aluminum alloy raw material wires and adjusting raw material wires are synchronously fed according to the rate proportion changing layer by layer, deposition is driven through deformation, and an aluminum alloy composite transition layer with additive phase components changing in a gradient mode is formed; after the aluminum alloy composite material transition layer is completely prepared, the continuous wire feeding friction stir additive manufacturing method is continuously adopted, and continuous deposition is conducted on the aluminum alloy composite material transition layer to form an aluminum alloy deposition layer; and after deposition manufacturing of the component is completed, subtractive machining treatment is carried out, and a final product is obtained. The invention relates to the technical field of dissimilar material additive manufacturing.

The invention discloses a high-thermal-conductivity aluminum-based composite material with an adjustable thermal expansion coefficient and a preparation method, and belongs to the field of composite materials. The material comprises a negative thermal expansion reinforcing body, a high thermal conductivity reinforcing body and an aluminum matrix, the total volume content of the negative thermal expansion reinforcing body and the high thermal conductivity reinforcing body accounts for 10-70 vol.%, the volume content of the negative thermal expansion reinforcing body accounts for 5-65 vol.%, the volume content of the high thermal conductivity reinforcing body accounts for 5-65 vol.%, and the balance is the aluminum matrix. The negative thermal expansion reinforcer is one or a combination of more than two of a ceramic material, an intermetallic compound and an alloy, and the average linear expansion coefficient or the volume expansion coefficient of the ceramic material, the intermetallic compound and the alloy is negative when t DEG C is greater than-100 DEG C and less than 300 DEG C; the high-thermal-conductivity reinforcer is one or a combination of more than two of inorganic non-metallic materials with the thermal conductivity higher than that of the aluminum matrix; and the aluminum matrix is one or a combination of more than two of aluminum alloy or pure aluminum in which the mass percentage of aluminum is more than 50%. The solid-phase sintering technology is adopted, and the volume fraction is accurately controlled.

The present invention relates to the field of ceramic technology, and specifically to a high thermal shock alumina composite ceramic and a preparation method thereof, comprising the following raw materials in parts by weight: 65-95 parts of an Al2O3-ZrO2 / ceramic fiber or whisker composition, 100-200 parts of deionized water, 8-12 parts of a plasticizer, and 2-15 parts of a low thermal expansion coefficient base material. The present invention reduces the thermal expansion coefficient of the alumina ceramic by adding ZrO2 / ceramic fiber or whisker to alumina, introducing ceramic fiber or whisker binary toughening while introducing ZrO2 phase change toughening, and introducing a unit with a lower thermal expansion coefficient or a negative thermal expansion coefficient. High-energy ball milling improves the uniformity of the powder interface, thereby improving the thermal shock resistance of the alumina composite ceramic. The method for preparing the ceramic is simple to operate, has high production efficiency, and low production cost. The ceramic round tube made of the alumina composite ceramic can meet the high thermal shock resistance requirements and can be widely used in environments with sudden temperature changes.

The present invention provides a negative thermal expansion material which has excellent negative thermal expansion properties and exhibits a gentle volume reduction with temperature rise as compared with a conventional zinc phosphorus composite oxide such as Zn2P2O7.　The present invention specifically provides a negative thermal expansion material which is characterized by being a composite of a zinc phosphorus composite oxide represented by general formula (1): ZnxMyPz1Ot1(1) and a metal pyrophosphate salt represented by general formula (2): AwPz2Ot2 (2), wherein the composite has a core-shell structure. It is preferable that a core contains the zinc phosphorus composite oxide represented by the general formula (1), and a shell contains the metal pyrophosphate salt represented by the general formula (2).

The invention belongs to the field of inorganic nonmetals, discloses a wide-temperature-range inorganic negative thermal expansion material and a synthesis method thereof, and requests to protect application of a Mn2V2O7 material as a negative thermal expansion material. The Mn2V2O7 material can be prepared on the basis of a solid-phase reaction method. The negative thermal expansion performance of the Mn2V2O7 material is disclosed for the first time, the negative thermal expansion temperature range is large and is 69-497 DEG C, the negative thermal expansion coefficient reaches-4 * 10 <-6 > DEG C <-1 >, and the Mn2V2O7 material is a wide-temperature-range inorganic negative thermal expansion material. The Mn2V2O7 material does not contain Hf, Dy, Lu, W and other rare metal elements, has a large negative thermal expansion temperature interval, and can be compounded with organic matters, metals, ceramics and the like to adjust the thermal expansion coefficient of the Mn2V2O7 material.

The invention provides a method for applying strain to a semiconductor material and a product. The method mainly comprises the following steps: S1, obtaining a semiconductor material donor and a negative thermal expansion substrate; s2, bonding the semiconductor material donor to the negative thermal expansion substrate at a first temperature; and S3, stripping the first semiconductor layer on the semiconductor material donor from the semiconductor material donor at a third temperature. According to the method for applying the strain to the semiconductor material, the optical and electrical properties of the semiconductor material can be adjusted, and the application range of the semiconductor material is widened.

The invention provides a method for applying stable strain to a semiconductor material and a product. The method mainly comprises the following steps that S1, a semiconductor material donor and a negative thermal expansion substrate are obtained, and the negative thermal expansion substrate has the property of positive thermal expansion or low thermal expansion in a first temperature interval and a third temperature interval and has the property of negative thermal expansion in a second temperature interval between the first temperature interval and the third temperature interval; s2, bonding the semiconductor material donor to the negative thermal expansion substrate at a first temperature in a first temperature interval; s3, stripping the first semiconductor layer on the semiconductor material donor from the semiconductor material donor at a second temperature in the first temperature interval; and S4, enabling the product subjected to the step S3 to work at the temperature of a third temperature interval. According to the method for applying the stable strain to the semiconductor material, the strain stability of the semiconductor material can be kept at the working temperature, and the strain control cost is reduced.

The invention provides an electric heating shock-resistant leading edge and a using method thereof.The electric heating shock-resistant leading edge comprises an outer side skin, a leading edge heating layer, a leading edge inner skin, an energy absorption structure layer, an energy absorption inner skin, ribs and a control module which are sequentially arranged in a stacked mode from outside to inside, the energy absorption structure comprises a Z-shaped body and a supporting body, one end of the supporting body is connected with the end of the Z-shaped body, the other end of the supporting body is connected with a bent portion of the Z-shaped body, the Z-shaped body is connected to the front edge inner skin, the supporting body is made of negative thermal expansion materials, and a probe is arranged at the position, corresponding to the supporting body, of the rib and comprises a pressure sensor and a distance monitor. And the probe and the front edge heating layer are electrically connected to the control module. The electric heating deicing function of bird impact resistance and automatic control of the front edge structure is achieved, the temperature control reliability is improved, the structural weight is reduced, and the technical problems of temperature control, bird impact resistance, structural weight reduction and the like are solved.

A bearing having a bearing surface with a groove, the bearing positioned adjacent to a shaft, the groove facing the shaft, and a negative thermal expansion (NTE) material positioned in the groove, the NTE material at least partially filling the groove.

The invention provides a composite material for forming a stress release layer, a preparation method of the composite material, an integrated co-fired piezoelectric ceramic actuator and a preparation method of the integrated co-fired piezoelectric ceramic actuator. The method for preparing the composite material for forming the stress release layer comprises the following steps: carrying out ball milling treatment on Bi2O3, Fe2O3, Pb3O4 and TiO2 to obtain precursor powder; the precursor powder is subjected to heat treatment, and BiFeO3-PbTiO3 ceramic powder is obtained; and mixing the BiFeO3-PbTiO3 ceramic powder with the inner electrode metal slurry to obtain the composite material. The internal stress of the actuator is effectively regulated and controlled by utilizing the negative thermal expansion characteristic of the BF-PT ceramic. The elasticity of the inner electrode metal ensures the stress slow-release capability of the inner electrode metal and the outer electrode metal serving as a composite material of a stress release layer, and meanwhile, an effective water vapor barrier is constructed due to the high density of the inner electrode metal.

The invention belongs to the technical field of three-dimensional micro-nano manufacturing and energy storage, and discloses a three-dimensional self-curling micro supercapacitor and a controllable preparation method thereof.The method comprises the steps that a double-layer film substrate is prepared, the double-layer film substrate comprises a conductive function layer with the negative thermal expansion coefficient on the top layer and a magnetic film substrate with the positive thermal expansion coefficient on the bottom layer, a high remanence material and a magnetocaloric material are uniformly distributed in the magnetic film substrate; preparing a patterned interdigital electrode on the surface of the conductive functional layer; preparing a positive electrode on one side of the interdigital electrode and preparing a negative electrode on the other side of the interdigital electrode on the surface of the conductive functional layer to obtain the composite planar micro supercapacitor. Bending and deforming the composite planar micro supercapacitor in a magnetic field to obtain a self-curling structure; and adding a liquid crystal electrolyte into the self-curling structure to obtain the three-dimensional self-curling micro supercapacitor. The projection area of the device is further reduced, the space utilization rate of the device is improved, and the energy density of the device in unit area is further improved.

The invention provides a bifunctional interface lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The bifunctional interface lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based layered oxide core particle, an inner negative thermal expansion inorganic layer coating the surface of the lithium-rich manganese-based layered oxide core particle, and an outer fast lithium ion conducting layer coating the outer side of the inner negative thermal expansion inorganic layer. Through the synergistic effect of inner and outer coating layers, mechanical regulation and control and chemical / ion regulation and control are simultaneously realized on the particle size. Compared with a scheme which only adopts an inert coating, a single lithium ion conductive coating or a single negative thermal expansion coating, the method has the advantages that the thermal-chemical-mechanical coupling failure problem of a positive electrode / solid electrolyte interface in the all-solid-state battery can be more comprehensively solved, relatively low interface impedance, smaller voltage attenuation and higher cycling stability are realized, the preparation process is simple, and the preparation cost is low. The method is suitable for large-scale production.

The invention provides a layered adjustable metal-based composite material and a preparation method, and belongs to the technical field of configurable metal-based composites.The metal-based composite material comprises ceramic metal mixing layers and metal layers which are alternately arranged, the single-layer thickness of the ceramic metal mixing layers is 100-1000 microns, and the single-layer thickness of the metal layers is 100-1000 microns; the ceramic-metal mixed layer is formed by mixing ceramic-based negative thermal expansion powder and first metal powder, the volume ratio of the ceramic-based negative thermal expansion powder in the ceramic-metal mixed layer is 20%-70%, and the metal layer is made of second metal powder. According to the ceramic-based negative thermal expansion powder, the ceramic-based metal mixing layers and the metal layers are alternately stacked, the ceramic-based negative thermal expansion powder has a wide negative thermal expansion temperature zone, the application range of the prepared product is widened, the prepared product is higher in density and few in interface reaction, and the heat conduction capacity of the prepared product is further improved.

A modified lithium iron phosphate, a preparation method therefor and a use thereof. The preparation method comprises the following steps: (1) mixing a zirconium salt, a tungstate and a solvent, to obtain a mixed salt solution, adjusting the pH, then adding lithium iron phosphate and performing a heating reaction; (2) separating a slurry obtained by the heating reaction into a solid and a liquid, and subjecting the obtained solid to a one-step sintering treatment, to obtain a first sintered material; (3) mixing an organic carbon source, a lithium source and the first sintered material, and performing a second sintering treatment, to obtain a modified lithium iron phosphate. A material having a negative thermal expansion effect is used as a coating layer, which is then coated with an electrically conductive material, causing pores to appear during a second coating process due to the negative thermal expansion effect, which is conducive to the embedding of organic matter and improves bonding tightness between the two layers of coatings. The pores generated during the negative thermal expansion process are conducive to the entry of lithium ions, which can better generate lithium tungstate and lithium zirconate from the tungsten oxide and zirconium oxide generated by decomposition.

The invention aims to provide a negative thermal expansion material with excellent negative thermal expansion performance. The negative thermal expansion material according to the present invention is characterized by containing a copper-vanadium composite oxide powder represented by general formula (1) in which Al atoms are solid-solved, in the formula CuxMyVzOt (1), M represents a metal element having an atomic number of 11 or more other than Cu, V and Al, x represents 1.60 < = x < = 2.40, y represents 0.00 < = y < = 0.40, z represents 1.70 < = z < = 2.30, and t represents 6.00 < = t < = 9.00 (where 1.00 < = x + y < = 3.00), and in the case where the negative thermal expansion material contains the element M, x represents a metal element having an atomic number of 11 or more. The number of moles of Al atoms in terms of atoms > the number of moles of M atoms in terms of atoms.

The invention provides a Mn-Fe-Ni-Si-Cu-based negative thermal expansion material as well as a preparation method and application thereof, and belongs to the technical field of negative thermal expansion materials. The negative thermal expansion temperature range of the Mn-Fe-Ni-Si-Cu-based negative thermal expansion material provided by the invention covers the high-temperature and low-temperature ranges (120K-896K), and the high-temperature and wide-temperature-range negative thermal expansion effect is shown; good mechanical properties are achieved; the material has extremely high thermal and mechanical stability, and has important significance for developing high-temperature precision mechanical devices based on zero expansion. The Mn-Fe-Ni-Si-Cu-based negative thermal expansion material disclosed by the invention is low in raw material cost and simple in preparation method.

The application discloses a SiO2-coated negative thermal expansion film and application thereof, and belongs to the technical field of temperature measurement. 12 :Nd 3+ The precursor solution is calcined to obtain the negative thermal expansion film, and then SiO2 solution is added dropwise on the negative thermal expansion film to obtain the SiO2-coated Yb2W3O 12 :Nd 3+ The SiO2-coated negative thermal expansion film is loaded on the opal template. 12 :Nd 3+ As a matrix, the SiO2 coating does not affect the luminescence of the negative thermal expansion film, and makes the Yb2W3O 12 :Nd 3+ The luminescence of the film in the near infrared is significantly enhanced. In addition, compared with the negative thermal expansion material film without the SiO2 coating, the negative thermal expansion material film is more sensitive to temperature.

The present invention relates to the technical field of lithium-ion batteries, and particularly provides a positive electrode sheet and a preparation method therefor, and a lithium-ion battery comprising the positive electrode sheet. The positive electrode sheet comprises a positive electrode active material layer, and the positive electrode active material layer comprises a positive electrode material, a negative thermal expansion material, a conductive agent, and a binder, wherein the characteristic value J of the positive electrode sheet satisfies: 0.001≤J≤0.005. wherein J=R(F) / ρ, R(F) represents the peak intensity ratio between the main peak (F) of the negative thermal expansion material and the (003) characteristic peak of the positive electrode material in the XRD pattern of the positive electrode sheet, and p represents the surface density of the positive electrode sheet, with a unit of mg / cm2.

The invention relates to the technical field of preparation of magnesia-calcium bricks, and provides a thermal expansion compensation magnesia-calcium brick and a preparation process thereof. The magnesia-calcium brick adopts a three-layer gradient structure design and comprises a porous layer, a transition layer and a compact layer, and negative thermal expansion composite particles, neutral thermal expansion adjusting particles and thermosensitive expansion particles are introduced into the formula of each layer to jointly form a thermal expansion compensation system. The bonding strength between layers is enhanced through a mechanical meshing structure of the dovetail grooves and the dovetail protrusions, and interlayer stripping is effectively avoided. The preparation process comprises the steps of raw material surface modification, layered burdening, mold design and charging, segmented temperature control sintering, coordinated cooling and the like. The problems that a traditional magnesia-calcium brick is not matched in thermal expansion and prone to cracking are effectively solved, the thermal shock resistance and structural stability of a brick body are remarkably improved, and the service life of the brick body is remarkably prolonged.

The application discloses a kind of superhigh temperature self-adaptive insulated cable of composite and preparation method thereof, which uses carbon nanotube fiber bundle as conductor, multiple layer aerogel-ceramic nanofiber composite felt as insulator, stress buffer layer formed by negative thermal expansion coefficient material is arranged between layers, and the outer sheath is chemical vapor infiltration SiC carbon fiber braided sleeve.The cable of the application has the advantages of ultra-light, high thermal stability, self-adaptive sealing and strong thermal shock resistance, and is suitable for extreme high temperature environment above 800 DEG C;The preparation method includes supercritical drying, pre-stretching winding and other key processes, to realize the high performance and reliability of the cable.

The application provides an isometric topology optimization method and device based on thermal elastic metamaterial design, and relates to the field of isometric topology optimization. The method comprises the following steps: constructing a multi-material interpolation model corresponding to the thermal elastic metamaterial, and obtaining a plurality of groups of density distributions corresponding to a plurality of solid materials in the thermal elastic metamaterial design domain according to the multi-material interpolation model, one solid material corresponding to one density distribution; obtaining the relationship interpolation between the plurality of groups of density distributions, and obtaining the elastic modulus and the thermal expansion coefficient according to the relationship interpolation; calculating the equivalent elastic matrix corresponding to the thermal elastic metamaterial according to the elastic modulus, and calculating the thermal expansion coefficient matrix corresponding to the thermal elastic metamaterial according to the thermal expansion coefficient; performing discrete form processing on the calculation equations of the equivalent elastic matrix and the thermal expansion coefficient matrix through the isometric grid, constructing a constraint function according to the equivalent elastic matrix, constructing an objective function according to the thermal expansion coefficient matrix, and calculating the sensitivity information corresponding to the first design variable through the objective function and the constraint function; updating the first design variable according to the sensitivity information until the thermal expansion coefficient meets the convergence condition, and obtaining the second design variable when the convergence condition is met through the isometric topology design model of the negative thermal expansion metamaterial; and optimizing the thermal elastic metamaterial according to the second design variable. The application solves the problem that the finite element method is difficult to guarantee the efficient and high-precision design of the thermal elastic metamaterial when dealing with complex geometric structures.