256 results about "Thermal expansion" patented technology

The invention provides a disc laser cutting, chamfering and splitting method, and relates to the technical field of glass product processing, and the method comprises the following steps: carrying out annular shape cutting on a to-be-processed glass raw material by using Bessel laser, and determining a mark point at the center of the to-be-processed glass raw material; according to the marking points, a camera is used for marking and positioning, and coordinate values of chamfering are obtained; performing laser chamfering on the current glass raw material according to the chamfering coordinate value to obtain a chamfered workpiece; the chamfered workpiece is sequentially moved below an outer ring heating block and an inner ring heating block, outer ring waste materials and inner ring waste materials sequentially and automatically fall off through the thermal expansion and cold contraction effect, and the finished annular glass piece is obtained. The problems of high glass processing cost, poor precision and environmental pollution in the prior art are solved.

The invention relates to the field of textile detection, and discloses a fabric flame retardance analysis method based on infrared thermal imaging sensing data, which comprises the following steps: performing non-contact temperature measurement on a fabric sample in a controlled heat shock disturbance field, acquiring an infrared imaging signal sequence, and performing energy projection rearrangement on the infrared imaging signal sequence; based on the discontinuous change of the energy flow density in the primary thermal behavior field, establishing a boundary disturbance model of a local overheating region, and comparing the morphological difference between a thermal expansion path and a radiation energy attenuation region; mapping the heat potential difference of each region in the critical response diagram into an energy constraint state inside the material, and deducing time bias distribution of energy conduction; introducing a spectrum equalization function under time offset distribution, and executing asymmetric compensation on local abnormal points of the infrared response data; and based on the decomposition threshold dynamic trajectory, calculating a flame-retardant response equilibrium rate and an energy flow retention rate, and forming a flame-retardant performance evaluation index. The method has the advantage of improving the accuracy of flame retardant detection.

The invention discloses a test device for measuring the compression strength of a composite material plate, which comprises an upper box body and a lower box body, a guide column is arranged between the upper box body and the lower box body, an upper clamping assembly is arranged at the lower end of the upper box body, a lower clamping assembly is arranged at the upper end of the lower box body, and the upper clamping assembly and the lower clamping assembly have the same structure and opposite installation directions. The upper clamping assembly or the lower clamping assembly comprises two wedge-shaped clamping block units which are oppositely arranged, and the end part of the test piece is clamped between the two wedge-shaped clamping block units. The invention also discloses a test method for measuring the compression strength of the composite material plate. The test device can stably work for a long time in high and low temperature environments, meets the test requirements of a compression test, adopts a split design, is rapid in clamping, can effectively resist bending and torsional deformation, improves the test efficiency and accuracy, keeps reliable clamping all the time in the test process, and is simple in structure and convenient to operate. And the problem of clamping failure caused by thermal expansion and cold contraction is effectively solved.

The invention provides a preparation method and application of ceramic slurry for high-temperature bonding of aluminum nitride ceramics, and relates to the technical field of high-temperature ceramic materials.The preparation method comprises the following steps that firstly, an organic carrier is prepared, a polymer binder, an organic solvent, a plasticizer and a dispersing agent are weighed according to the weight ratio and stirred at the temperature of 60-70 DEG C till complete dissolution and clarification are achieved for use; 2, an inorganic functional phase is prepared, aluminum nitride powder, yttrium oxide powder and alkaline earth metal oxide powder are weighed according to the weight proportion and placed in a ball milling tank to be evenly mixed, the obtained ceramic slurry serves as a bonding layer, the tolerable temperature can reach 1000 DEG C or above and is far higher than that of metal brazing filler metal, and the ceramic slurry is suitable for severe environments such as aerospace and high-temperature sensors. The main components of the bonding layer are consistent with the base material, and the thermal expansion coefficient is highly matched, so that the thermal stress can be greatly relieved, and the failure of the device caused by thermal fatigue in the temperature cycle is avoided.

The invention discloses a heat distribution pipeline heat preservation and energy saving device, and relates to the technical field of pipeline heat preservation, in particular to a heat distribution pipeline heat preservation and energy saving device which comprises a heat distribution pipeline and an outer pipe wrapping the heat distribution pipeline, and a rubber pipe capable of deforming is arranged between the heat distribution pipeline and the outer pipe. Through the thermal expansion and cold contraction characteristics of inert gas filled in the extrusion cavity and the arrangement that the first heat preservation cabin is communicated through the first communication opening, when the external environment temperature distribution is uneven, the inert gas in the extrusion cavity of the perpendicular incidence face expands to push the rubber pipe to deform; carbon dioxide in a first heat preservation cabin in a compressed area is transferred to the shady side through a first communication opening, a heat preservation gas layer on the shady side is promoted to expand and thicken, and meanwhile a main movable plate is driven to rotate around a limiting column so that the whole heat preservation structure can deviate. The purposes of dynamically adjusting the thickness of the heat-preservation air layer according to the environment temperature difference, strengthening the heat-preservation effect of the shady face and reducing heat loss are achieved.

The invention provides a doped yttrium hydride neutron moderation material and a preparation method and application thereof, and belongs to the technical field of radiation shielding materials. At least one of samarium, europium and gadolinium is doped in yttrium hydride in the form of hydride, and the mass ratio of metal yttrium to metal gadolinium to metal europium to metal samarium is controlled, so that the neutron moderation effect of the neutron moderation material can be improved. According to the invention, at least one of gadolinium hydride, europium hydride and samarium hydride is mixed with yttrium hydride under the protective atmosphere, so that the mass content of each element in the doped yttrium hydride neutron moderation material can be accurately controlled. According to the invention, the mixture is sintered and molded, and the sintering parameters of sintering and molding are controlled, so that the components of the mixture are sintered in a compact state, cracks generated by thermal expansion and cold contraction can be reduced, and the doped yttrium hydride keeps high density and has fewer cracks and defects.

The invention discloses a high-temperature-resistant epoxy resin-based mold prepreg as well as a preparation method and application thereof, and belongs to the technical field of resin-based composite materials. The preparation method comprises the following steps: mixing and stirring the epoxy resin A and the heat-conducting filler, and grinding to obtain a premix I; mixing and stirring a curing agent and epoxy resin B to obtain a premix II; mixing and stirring the premix I and the premix II to obtain a mixture; and coating release paper with the mixture, covering the release paper with fiber cloth, and carrying out hot-pressing impregnation to obtain the high-temperature-resistant epoxy resin-based mold prepreg. The invention also discloses the high-temperature-resistant epoxy resin-based mold prepreg prepared by the method and application of the high-temperature-resistant epoxy resin-based mold prepreg in preparation of a composite material mold. The prepreg prepared by the method has excellent high temperature resistance, low thermal expansion coefficient and high heat conductivity coefficient, and the service life of a composite material mold can be greatly prolonged.

The invention provides a polyurethane composite material as well as a preparation method and application thereof, and relates to the field of polyurethane materials. The polyurethane composite material comprises the following components or is formed by the following raw materials in parts by weight: 100 parts of a polyurethane prepolymer; 10 to 40 parts of modified whisker; 5 to 20 parts of modified nanofiber; the modified crystal whiskers are crystal whiskers modified by a first isocyanate modifier and a first free radical modifier, and the chain extender is modified by a second isocyanate modifier and a second free radical modifier; the modified nanofiber is a nanofiber modified by a first diisocyanate type modifier and a second free radical type modifier. According to the polyurethane composite material provided by the invention, grafted and modified whiskers and nanofibers are introduced and directly react with polyurethane to form a molecular-level interpenetrating network, so that the linear thermal expansion coefficient of the polyurethane material is remarkably reduced, and meanwhile, the mechanical property of the polyurethane material is improved.

The invention relates to the technical field of thermal barrier coatings, in particular to a gadolinium oxide and aluminum oxide co-doped modified YSZ: Dy thermal barrier sensing coating material as well as a preparation method and application thereof. The invention provides a thermal barrier sensing coating material. The chemical composition of the thermal barrier sensing coating material is Y Gd Al < c > Zr < d > DeyOf, wherein a is equal to 0.01 to 0.04, b is equal to 0.15 to 0.35, c is equal to 0.40 to 0.60, d is equal to 0.35 to 0.70, e is equal to 0.01 to 0.02, and f is equal to 1.50 to 1.70. The temperature measurement upper limit of the thermal barrier sensing coating material is 1200 DEG C, and the average thermal expansion coefficient is increased by 18% at the room temperature of 1200 DEG C, so that the thermal shock resistance of the thermal barrier sensing coating is effectively improved, and the service life of the thermal barrier sensing coating is prolonged.

Provided is a glass which can replace a Li2O-Al2O3-SiO2-based crystallized glass and which has a low coefficient of linear thermal expansion and excellent light transmittance. A glass characterized by containing, in mass%, 45 to 80% of SiO2, 10 to 30% of Al2O3, 0 to 12% of B2O3, and 0 to 5% of Li2O.

A method of integrating a first substrate having a first surface with a first insulating material and a first contact structure with a second substrate having a second surface with a second insulating material and a second contact structure. The first insulating material is directly bonded to the second insulating material. A portion of the first substrate is removed to leave a remaining portion. A third substrate having a coefficient of thermal expansion (CTE) substantially the same as a CTE of the first substrate is bonded to the remaining portion. The bonded substrates are heated to facilitate electrical contact between the first and second contact structures. The third substrate is removed after heating to provide a bonded structure with reliable electrical contacts.

The invention relates to the technical field of functional material preparation, in particular to a high-low-temperature-resistant high-performance packaging composite material for a vehicle energy storage system and a forming process of the high-low-temperature-resistant high-performance packaging composite material. 30-50 parts of a heat-conducting filler; 5-10 parts of a high and low temperature resistant modifier; 3-8 parts of a toughening agent; 0.5-2 parts of a catalyst; 1-3 parts of an auxiliary agent; a three-dimensional heat conduction network is formed in the composite material, the heat conduction coefficient is larger than or equal to 3.5 W / (mK), the low-temperature tensile strength at-40 DEG C is larger than or equal to 15 MPa, the high-temperature tensile strength at 150 DEG C is larger than or equal to 12 MPa, the volume resistivity is larger than or equal to 1 * 10 < 14 > omegacm, and the thermal expansion coefficient is smaller than or The material is excellent in thermal conductivity, balanced in high and low temperature resistance and mechanical property, good in aging resistance and barrier property, optimized in forming process and high in performance consistency, and provides reliable guarantee for safe and stable operation of a vehicle energy storage system.

This invention belongs to the field of glass technology and relates to a high-temperature resistant structural glass material, its preparation method, and its applications. The glass is composed of the following components by mass percentage: 60%-70% silicon dioxide, 5.5%-11% boric acid, 0.1%-5% aluminum hydroxide, 0%-3% potassium nitrate, 5.5%-13% potassium carbonate, 0%-12% sodium carbonate, 0.1%-4% calcium carbonate, 0%-2% calcium fluoride, 0%-1% lithium carbonate, 0%-2% basic magnesium carbonate, 0.1%-1% titanium dioxide, 0%-2% zirconium dioxide, and 0%-1% cerium dioxide; the total mass percentage of potassium nitrate, potassium carbonate, sodium carbonate, and lithium carbonate does not exceed 22%. This structural glass possesses a high softening temperature, a suitable coefficient of thermal expansion, high-temperature resistance, thermal shock resistance, and processing performance, making it suitable as a structural material for optoelectronic devices.

The present invention discloses a low-expansion glass-ceramic, a preparation method, and applications thereof. The low-expansion glass-ceramic comprises the following components by weight: 56-67% SiO2, 18-27% Al2O3, 3.1-7.0% Li2O, 0.1-0.5% MgO, 0.1-0.9% ZnO, 1.0-2.9% P2O5, 1.0-2.9% TiO2, 1.0-2.9% ZrO2, 0.5-4% Gd2O3, 0.6-1.5% SnO2, and 0.1-0.4% CaF2. The low-expansion glass-ceramic prepared by the present invention has excellent properties such as a low thermal expansion coefficient and good visible light transmittance. The low-expansion glass-ceramic prepared by this method can be used in the field of extreme ultraviolet lithography.

Provided is a glass substrate that reduces errors in the correction of thermal deformation.　This glass substrate has a rectangular main surface (MS1). When the main surface is divided into nine equal parts in a direction perpendicular to a first side (S1) and divided into nine equal parts in a direction perpendicular to a second side (S2), thereby dividing the main surface into a group of 81 rectangular regions (A11-A99), the rectangular regions, in the group of 81 rectangular regions, the centers of which are located on a diagonal line of the main surface passing through a first vertex (P1) that is an intersection point of the first side and the second side, satisfy expression (1A), where TZ11、TZ22、TZ33、TZ44、TZ55、TZ66、TZ77、TZ88、and TZ99 are zero crossover temperatures in ˚C, at which the thermal expansion coefficient of the glass substrate becomes 0 ppb / K, starting from the closest to the first vertex. (1A): (TZ11+TZ99)-(TZ22+TZ88)＜0.00

A glass includes silica, alumina, boria, and yttria. The glass may have high fracture toughness, often greater than 1 MPa·m1 / 2, as well as high Vickers hardness, on the order of 800 kgf / mm2 or greater. Furthermore, Applicants find that, due to surprisingly large high-temperature coefficient of thermal expansion (e.g., over 35 ppm / °C at about 875°C) and high elastic modulus (e.g., >120 GPa) the glass may be particularly suitable for thermal tempering, which may strengthen a corresponding article comprising the glass.

The utility model discloses a zipper machine for conveying high-temperature materials, and relates to the technical field of material conveying equipment, the zipper machine comprises a conveying groove body and a driving unit, a transmission shaft is rotatably arranged in the conveying groove body, the driving unit is used for driving the transmission shaft to rotate, and extension shafts are coaxially and fixedly arranged at the two ends of the transmission shaft; the two sides of the conveying groove body communicate with supporting sleeves, the extending shafts on the corresponding sides are sleeved with the supporting sleeves, the ends, away from the conveying groove body, of the supporting sleeves communicate with sealing covers, the distance between the sealing covers and the conveying groove body is not smaller than 300 mm, and oil seals are arranged in the sealing covers and used for sealing gaps between the extending shafts and the supporting sleeves. The extension shaft is sleeved with a bearing, and the outer ring of the bearing is fixedly connected with the sealing cover. The influence of heat transferred by high-temperature materials on the bearing and the oil seal can be effectively reduced, the problem that lubricating oil needs to be frequently filled due to high-temperature evaporation is solved, and meanwhile structural thermal deformation and damage caused by thermal expansion are prevented.

The application discloses a flue gas heat exchanger pipe connecting structure capable of preventing heat stress from causing leakage. The structure comprises a heat exchange pipe, which is connected with a flue wall in a soft manner to eliminate the influence of heat stress between the heat exchange pipe and the flue wall. An expansion joint is arranged on the heat exchange pipe in the flue to provide a buffer space for the deformation of the heat exchange pipe caused by thermal expansion and contraction in the axial direction. The heat exchange pipe and the flue wall are connected in a soft manner by using a fixing nut, an elastic gasket and a fixing ring, and the gasket is made of polytetrafluoroethylene material. The axial and radial deformation of the heat exchange pipe caused by thermal expansion and contraction is effectively absorbed while the sealing is considered, so as to offset the influence of heat stress between the heat exchange pipe and the flue wall. The heat exchange pipe and the expansion joint are welded in the flue, and the expansion joint provides a buffer space for the deformation of the heat exchange pipe body caused by thermal expansion and contraction in the axial direction, so that the influence of heat stress on the connecting point of the flue gas heat exchanger and the flue wall can be further inhibited.

The invention provides a method for solving crazing defects of a composite material product, which comprises the following steps: a) controlling the temperature of liquid resin to be within a preset range in the process of applying the liquid resin to the inside and the surface of a solid material component of the composite material product; b) in the pre-curing process of the composite material, controlling the actual heating rate of the liquid composite material to be within a preset range; and c) in the post-curing / heat treatment process of the composite material, controlling the actual temperature of the composite material to be within a preset range. By controlling the infiltration, permeation and adsorption process of the liquid-state base material, the liquid-state base material reaches the optimized infiltration and adsorption state on the molecular level on each interface of different materials and different combined structures; and meanwhile, local stress concentration caused by the difference of thermal expansion and cold contraction multi-mode response of the material is controlled to be lower than a critical value for inducing craze formation, so that the craze whitening phenomenon of a composite material product is solved.

Closure arrangement (10) for covering and closing openings in buildings, roofs, walls, in particular for weather protection, for pergolas, for canopies, for doors, gates and the like, comprising at least one profile arrangement (5, 5'), wherein the profile arrangement (5, 5') has at least one hollow chamber (50, 51) and at least one connecting element (3) and / or at least one connecting device (4), wherein the profile arrangement (5, 5') has at least one structural layer (6), wherein the at least one structural layer (6) has at least a portion of a polymeric material, wherein the profile arrangement (5, 5') has at least one reinforcing insert (7), preferably fully embedded in the structural layer (6), characterized in that the profile arrangement (5, 5') has a bending stiffness about the x-axis of approximately 17 to 29 × 10 9 N / mm 2 , preferably about 18 to 22 × 10 9 N / mm 2according to DIN EN ISO 178-2019-08, the profile arrangement (5,5') has a linear coefficient of thermal expansion α of approximately 12 to 64 × 10 -6 / K, preferably 16 to 30 × according to DIN EN ISO 11359-2:2021-11, having the material of the at least one structural layer (6) comprising microhollow spheres consisting of a plastic shell filled with a gas.

The invention discloses a high-performance low-expansion heat-resistant purple sand tea set with a far infrared radiation function, and belongs to the technical field of ceramic tea sets, the tea set adopts an inner-outer double-layer composite structure, the inner layer is a low-expansion enhancement layer, and raw materials comprise 58-73% of purple sand raw ore, 2-3% of rare earth, 10-20% of surface hydroxylation cordierite micro powder, 5-15% of mullite particles and 2-5% of a sintering aid; the outer layer is a far infrared radiation functional layer and comprises the following raw materials: 30-40% of far infrared radiation powder, 30-40% of purple sand fine powder and 10-15% of a high-temperature binder; a quartz sand transition layer is arranged between the inner and outer layers. According to the high-performance low-expansion heat-resistant purple sand tea set with the far infrared radiation function, through the inner layer hydroxylation cordierite micro powder modification technology, the interface bonding strength of cordierite and a purple sand matrix is improved, and the framework supporting effect of mullite particles is matched, so that the thermal expansion coefficient of the inner layer is reduced, and the thermal shock resistance is improved; the problem of temperature difference cracking is solved.

The application discloses a preparation method of aluminum silicon carbide material based on plasma deposition, which comprises the following steps: 1) particle grading; 2) preliminary coating; 3) thermal spray coating; 4) plasma deposition; and 5) hot isostatic pressing of the rough blank, and finally aluminum silicon carbide is obtained. The application discloses a preparation method of aluminum silicon carbide material based on plasma deposition, and aluminum silicon carbide material with high silicon carbide volume fraction, low porosity, high thermal conductivity and adjustable thermal expansion coefficient is obtained.

A deodorization floor drain comprises a filtering section and a deodorization section, a water inlet is formed in the upper end of the filtering section, a water outlet is formed in the deodorization section, the deodorization section is connected to the lower end of the filtering section, the water inlet and the water outlet are communicated through the deodorization section, and the deodorization section is provided with a deodorization structure. The filter section and the deodorization section which are integrally formed have no connecting gap, compared with a traditional floor drain component connected in a splicing mode, the problem of water leakage caused by untight connection does not exist, and due to the fact that the floor drain component is of an integral structure, the floor drain component is more convenient to install, and the floor drain component is more attractive in appearance. The polymer material is integrally formed, so that the floor drain has better mechanical performance and can bear certain pressure and impact force, the integrally formed floor drain cannot cause dislocation among parts due to thermal expansion and cold contraction of the material or long-term water flow scouring, and the service life of the floor drain is greatly prolonged.

The invention discloses a silicon-carbon material and a preparation method and application thereof. The silicon-carbon material comprises a carbon material core and a coating layer which at least covers part of the surface of the carbon material core, the coating layer comprises silicon dioxide, and the carbon material core comprises sp2 hybrid carbon; a C-O-Si covalent bond is arranged between the carbon material core and the coating layer. Therefore, the silicon-carbon material disclosed by the invention has the advantages of high carbonization rate, low dielectric constant, high mechanical strength, low thermal expansion coefficient and the like, and shows excellent comprehensive performance.

The utility model relates to a Teflon lining anti-corrosion pipe fitting, and belongs to the technical field of pipeline corrosion prevention, the Teflon lining anti-corrosion pipe fitting comprises a drainage pipe, the left side and the right side of the drainage pipe are each provided with a connecting flange for prolonging the service life of the drainage pipe and improving the connecting stability of the drainage pipe, and four locking grooves are formed in the drainage pipe. According to the Teflon lining anti-corrosion pipe fitting, the stainless steel layer can provide good supporting performance for the whole pipeline, the Teflon layer fixed to the inner side can remarkably improve the corrosion resistance of the pipeline, good high-temperature resistance is achieved, and finally, the connecting effect is guaranteed through the connecting flange, and meanwhile the service life of the pipeline is prolonged. The thermal expansion and cold contraction effect of the drainage pipe can be matched in a slight telescopic mode, the overall high-temperature-resistant effect of the pipe fitting is further improved, the upper limit of the applicable temperature interval is greatly improved, the requirement for alternate conveying of cold and hot materials on the same pipeline can be met, the industrial production flexibility is widened, and the production cost is reduced. And moreover, the daily maintenance frequency and cost are reduced, and the increase of economic benefits is indirectly promoted.

The application relates to a two-dimensional material heterojunction device and a preparation method thereof, and belongs to the field of two-dimensional materials. The preparation method processes an embedding electrode after etching a substrate by a reactive ion etching machine, guarantees that the electrode is basically consistent with the substrate in height, effectively improves surface flatness, is favorable for avoiding rupture of a heterojunction structure when a multilayer heterojunction structure is prepared, is favorable for forming a heterojunction structure with more layers, and greatly improves the success rate and device quality of the multilayer heterojunction device. The preparation method also controls a fitting speed in a dry transfer process by thermal expansion and cold contraction to reduce damage to materials in the fitting process, and greatly improves the success rate and device quality of the multilayer heterojunction device.

This utility model discloses a multicolor telescope body cladding, including a cladding tube. Support tubes are connected to both sides of the cladding tube. Sealing slots are provided on both sides of the cladding tube, outside the support tubes. Sealing components, including sealing caps, are installed on both sides of the cladding tube. This utility model utilizes the high resilience and wear resistance of the styrene-butadiene rubber (SBR) inner tube, which is less prone to deformation and cracking, thus improving fatigue resistance. The use of a polyethylene (PE) tube optimizes structural strength and weather resistance, reduces the impact of thermal expansion and contraction by dispersing stress, adapts to temperature differences from -40℃ to 60℃, and prevents aging and embrittlement. The use of a maleic anhydride-modified TPE tube achieves a balance between lightweight and impact resistance, and also has low-temperature resistance, preventing aging and embrittlement. The use of a nitrile rubber (NBR) outer tube enhances oil resistance, chemical resistance, and low-temperature toughness, effectively resisting sweat, oil stains, or extreme environmental corrosion, improving overall durability and sealing.

This invention relates to a method for preparing a silicon nitride wear-resistant coating on the surface of a graphite part. The method involves coating the graphite part with polynitrosilane, followed by drying and subsequent decoking and high-temperature ceramization treatments. The process is precisely designed as a multi-stage heating decoking and high-temperature ceramization process. By strictly controlling the heating rate and holding time, the method avoids coating shrinkage and cracking caused by rapid heating, as well as resource waste and increased internal stress caused by excessively slow heating. Simultaneously, the decoking temperature is optimized to prevent excessive decomposition and escape of polynitrosilane or residual small molecules. This effectively solves the coating cracking problem caused by the difference in thermal expansion coefficients between graphite and silicon nitride, thereby obtaining a dense, uniform, and crack-free silicon nitride coating.

The invention belongs to the field of solid electric heating energy storage boilers, and provides a preparation method of a high-temperature-resistant, low-expansion, high-heat-storage and high-resistance heat storage material, the heat storage material is designed based on the microstructure of the material, magnesia particles with the particle size being larger than or equal to 1 mm are selected as aggregate, and organic matter coating is conducted on the magnesia particles through a coating technology; then mixing and twisting 30-50 parts of coated magnesia particles, 40-50 parts of high-alumina bauxite, 4-6 parts of binding clay, 2-3 parts of a binding agent and 3-6 parts of an aqueous solution, bundling the mixed and twisted materials, forming a green body by adopting a mechanical pressing process, and performing high-temperature heat treatment to obtain the heat storage material. The prepared heat storage material is of a magnesia particle-annular pore-spinel / cordierite reaction layer-mullite gradient structure, so that the cooperation of low thermal expansion coefficient, high heat storage capacity and high thermal resistance of the material is realized; the chemical composition of the prepared heat storage material is as follows: 10%-50% of MgO, 50%-80% of Al2O3, 10%-40% of SiO2 and a small amount of impurities.

The application relates to the technical field of building detection, and discloses a building outer wall crack detection device which comprises a detection mechanism, a dynamic bearing mechanism and an auxiliary support assembly. The detection mechanism comprises a shell and an auxiliary support assembly arranged at the top of the shell. The dynamic bearing mechanism comprises a mounting plate, an adaptive assembly arranged on one side of the mounting plate and a damping gasket fixedly arranged on the other side of the mounting plate. The adaptive buffer structure of the dynamic bearing mechanism is adopted to automatically compensate the deformation of metal materials, so that the detection reference is long-term stable. The sealing and drying mechanism is provided with multiple protective barriers and a humidity sensing alarm system. The sealing and drying mechanism not only blocks the invasion of external pollutants, but also triggers an early warning when the sealing material is initially aged. The adjustable rigid structure of the auxiliary support assembly is matched with the flexible connection design, so that the support strength is guaranteed and the thermal expansion and cold contraction of the material can be adapted. The active protection system is formed, the material performance attenuation in the initial stage can be identified and warned, and the influence of the accumulation of hidden damage on the detection precision is avoided.