1987 results about "Thermal break" patented technology

The invention relates to the technical field of cables, and discloses a multi-layer composite wrapped high-temperature-resistant anti-aging cable which sequentially comprises a conductor, an insulating cable core, a shielding layer, an outer insulating layer, a fireproof layer, a heat insulation layer, a buffer cushion layer, an armor layer, an anti-aging layer and an outer sheath layer from inside to outside. The fireproof layer is formed by alternately laminating synthetic mica tapes and ceramic boron silicone rubber tapes, a reliable fireproof barrier is formed, and the heat insulation layer is arranged to achieve efficient heat insulation and stable structure through cooperation of gradient pore nano aerogel, ceramic silicone rubber round rods and phase change capsules. The buffering cushion layer is combined with the composite layer, the aluminum oxide hollow ball array and the composite capsule, so that the mechanical buffering and auxiliary heat insulation functions are achieved; the armor layer is woven by stainless steel fibers, the mechanical protection capability is improved, and the anti-aging layer is of a double-layer structure composed of montmorillonite composite fluororubber and an anti-oxidation layer, so that thermal oxidation aging is delayed.

A panel system provides a prefabricated exterior building façade. Various wall claddings and clips for hanging wall claddings are discussed. Panel connector parts are disclosed for hanging wall cladding panels against a building wall. Panel connector parts are disclosed for hanging dual layers of insulating material against a building wall with a drainage cavity or gap defined between the dual layers. A wall cladding system includes: a building wall; a plurality of wall cladding panels each comprising insulating material and defining an external face, a rear face, and side edges, with adjacent of the wall cladding panels abutting one another along respective side edges; panel connector parts mounted on the building wall and mounting the plurality of wall cladding panels as a continuous thermal break layer against the building wall.

The invention provides a spacecraft quartz powder heat insulation tile which is prepared by adopting high-purity quartz powder (SiO2) as a main raw material and combining a high-temperature-resistant ceramic fiber reinforcement and a nano aerogel heat insulation layer through a high-temperature sintering process. The heat insulation tile has the following advantages: 1, the heat insulation tile has excellent high temperature resistance, and can tolerate 1600 DEG C high temperature for a long time and tolerate 1800 DEG C instantaneous thermal shock for a short time; 2, repeated use: the structure is stable, and high strength is still kept after multiple thermal cycles; light weight: the density is low (less than or equal to 0.5 g / cm < 3 >), and the load of a spacecraft is reduced; and 4, the thermal conductivity is low (less than or equal to 0.05 W / m.K), and heat transfer is effectively isolated. The method is suitable for thermal protection systems (TPS) of spacecrafts, such as thermal insulation of reentry capsules and rocket engine nozzles.

The invention discloses a multi-layer protection cable resistant to an extreme environment, and belongs to the technical field of cables. The cable is of a seven-layer composite structure design and sequentially comprises a conductor, an insulating layer, a shielding layer, a buffer layer, a waterproof layer, a heat insulation layer and a protective outer layer from inside to outside, and the conductor is made of high-purity oxygen-free copper; the insulating layer is made of a polyimide material and has high temperature resistance, low temperature resistance and excellent insulating property; the shielding layer is composed of a tinned copper wire woven mesh and a high-permeability permalloy foil, and electromagnetic interference is effectively shielded; the buffer layer is made of an elastic rubber material to relieve mechanical stress; the waterproof layer adopts a nanoscale fluorosilicone resin coating and has excellent waterproof performance; the heat insulation layer is made of ceramic fibers and aerogel, and efficient heat insulation is provided; and the protective outer layer is made of a high-strength and corrosion-resistant polyether-ether-ketone (PEEK) material. The cable has excellent high temperature resistance, low temperature resistance, corrosion resistance and electromagnetic interference resistance, is suitable for extreme environments, and ensures stable transmission of electric power and signals under extreme conditions.

The invention discloses a modularized multipurpose gas flow heat exchange experiment section. The experiment section comprises a cooling ring cavity assembly, an experiment section heat exchange inner pipe, an inlet and outlet gas guide pipe, a heat insulation layer, a wall surface temperature thermocouple, a thermocouple fixing curved surface, an outer ring cavity fixing lantern ring, a fixing bolt and a flexible sealing material. An experiment section heat exchange inner pipe is a high-temperature-resistant alloy long pipe, working medium gas and a cooling medium are arranged inside and outside the pipe respectively, and a nanometer heat insulation layer and a gas circulation guide pipe are arranged in the two ends of the inner pipe so as to reduce unnecessary gas heat exchange; the wall surface temperature measuring thermocouple is fixed on the pipe wall in a silver brazing manner to realize accurate measurement of the wall surface temperature; in addition, the cooling ring cavity assembly is composed of an upper piece and a lower piece which are connected in a flange mode and filled with flexible materials for sealing. The experimental section can be used for carrying out flow heat exchange research on heating or cooling working conditions according to requirements in the use process, and meanwhile, each component is modularly mounted to realize flexible replacement and change, so that the reliability and the expandability are greatly improved.

The invention discloses a method for testing a polyurethane thermal insulation layer of a new energy automobile battery pack. The method comprises the following steps: simulating the operation condition of the battery pack, constructing a scenarized digital environment, and obtaining multi-condition multi-band data; arranging a virtual electrode array based on the data, applying an alternating current signal and collecting electrical information such as impedance and phase; and a three-dimensional impedance distribution map is generated through iterative inversion by combining a multi-physics field coupling model, and the defects of the polyurethane thermal insulation layer are identified and evaluated. According to the technical scheme, under the real working conditions of high and low temperature, fast charging, discharging and the like, the potential problems of cracks, delamination, bubbles and the like in the heat insulation layer can be accurately positioned, and the safety and the heat management efficiency of the new energy automobile battery pack are improved.

To provide a prefabrication method for a layered wall that can integrate tiles and a heat insulation layer without breakage.SOLUTION: A layered wall cantilevers a tile and a mold on both sides of a core concrete layer to form a structure which has rigidity like a core tube steel structure and also allows elastic deformation, a heat insulation layer is charged between the tile and core concrete layer and connected with a precast outer support rod to be completely cast, layer by layer, without inversion, wherein the title is not broken owing to inversion, sandwiched between the heat insulation layer with elasticity and a mold for another layered wall to be securely hardly broken during warehouse storage / transportation, and also securely hardly broken in crane assembly, the heat insulation layer is sandwiched inside to be securely hardly dropped or broken, and a wind leak and a cold bridge are evaded with the precast outer support rod. On casting the core concrete layer, operations to connect with an outer support tile layer, block the cold bridge, and block convection are completed, so that the method is simple and easy to operate.SELECTED DRAWING: Figure 1

The heat accumulating type electric heater comprises a shell and a heat accumulator, a heat preservation and insulation layer is arranged on the inner side of the shell, the shell comprises a first shell section and a second shell section, and the shell is horizontal; the first shell section comprises an inlet section and a diffusion section, and the diffusion section is arranged to be in a conical shape. The diameter of the second shell section is larger than that of the inlet section. The two ends of the diffusion section are connected with the inlet section and the second shell section respectively. The heat accumulator is made of high-temperature-resistant alloy and provided with a plurality of heat exchange holes and heating holes, the heat exchange holes and the heating holes penetrate through the heat accumulator, heating units are arranged in the heating holes, and each heating unit comprises a resistance wire. According to the invention, gas flow heating is realized by adopting resistor direct heating and heat storage, the gas purity is high, and the test accuracy is good. The shell is of a horizontal structure, the length of an outlet pipeline can be reduced, temperature loss can be reduced, the defect that the temperature field is uneven due to the fact that the temperature of the upper portion of the heat accumulator is too high and the temperature of the lower portion is too low in the heat accumulation process can be overcome, and the temperature control precision reaches + / -1 DEG C.

The invention relates to the technical field of wires and cables, and discloses a fire-resistant cable based on an overhead photovoltaic system, a braided ring in a fire-resistant flame-retardant layer is formed by winding flame-retardant crosslinked polyethylene fibers, air circulation is guaranteed by virtue of a large number of pores among ropes, and when the fire-resistant cable is burnt by flame, high-temperature gas enters the space of the braided ring, and then the braided ring is sealed. On the other hand, the liquid drainage rod is pulled through contraction traction force, the piston disc is promoted to extrude the flame-retardant liquid in the storage sleeve, after the liquid is sprayed out through the liquid drainage holes, one part of the liquid directly acts on a flame area for fire extinguishing and flame retarding, and the flame-retardant effect is achieved. Most of the materials are adsorbed and retained by the porous structure of the braided ring, are gradually decomposed at a continuous high temperature to release flame-retardant gas, and react with braided ring fibers to form a liquid-state and solid-state composite heat-insulating layer to fill tiny pores which are still remained after shrinkage, so that the integrity of a cable circuit at the initial stage of a fire disaster is guaranteed.

The utility model discloses a double-conveying direct cooling plate with a spiral capillary channel, the direct cooling plate comprises a structure substrate and a heat exchange cover plate which is overlapped and fixed on the structure substrate, the heat exchange cover plate is provided with a groove, and the groove is sealed by the structure substrate to form a heat exchange flow channel; the groove face of the heat exchange cover plate is provided with a plurality of spiral capillary conveying grooves in the flowing direction of a flow channel, the depth of each capillary conveying groove is 0.1-0.5 mm, and the width of each capillary conveying groove is 0.1-0.3 mm. And the runner is provided with a heat insulation layer on one surface of the structural substrate. According to the direct cooling plate, the spiral capillary channel structure is introduced to the wall face of the flow channel, the contact area of cooling liquid and the wall face is increased, a second conveying mode except the flow channel is provided, and therefore the heat transfer efficiency is remarkably improved. Meanwhile, the design can effectively relieve the formation of an air plug and avoid the occurrence of a heat dissipation dead point so as to adapt to battery packs of different types and powers and meet the temperature control requirements of the battery packs.

The invention relates to the technical field of high-power femtosecond laser manufacturing, and discloses a high-power industrial femtosecond laser water cooling structure and a thermal stability optimization method thereof. Comprising the steps that an adjustable flow resistance valve driven by a shape memory alloy is arranged in a cooling water channel in a machine shell water cooling plate, and a temperature sensor is embedded in a key position of the machine shell water cooling plate; a paraffin-based or metal-based phase change material is filled at the bottom of the heat dissipation chute of the shell water cooling plate; an ultrathin uniform-temperature plate is embedded in the water-cooling plate of the casing, so that heat of local hot spots, such as heat near a reflecting mirror seat, on the water-cooling plate of the casing is quickly diffused to the whole water-cooling plate; bionic guide vanes are arranged in the cooling water channel; an aerogel heat insulation layer is additionally arranged between the machine shell water cooling plate and the outer shell, the machine shell water cooling plate and the outer shell are connected through a titanium alloy connecting piece with a low expansion coefficient, and a flow channel cover plate and the machine shell water cooling plate are flexibly connected through a metal corrugated pipe.

The invention relates to the field of tension and pressure sensors, in particular to a tension and pressure sensor with a compensation function, which comprises an elastic body, a strain gauge, a compensation gauge and a wiring terminal, the strain gauge and the compensation gauge are respectively arranged on the surface of the elastic body, the strain gauge, the compensation gauge and the wiring terminal are electrically connected through a plurality of high-temperature-resistant cables to form a bridge circuit, at least the strain gauge and the compensation gauge are respectively limited in the first heat insulation layer and the protection layer, and the first heat insulation layer is located between the elastic body and the protection layer. At least a first heat insulation layer used for protection, heat insulation, pressure resistance and sealing is used for wrapping a strain gauge and a compensating gauge which are packaged by a polyimide film and can resist the high temperature of 260 DEG C, so that the actual temperature of the strain gauge and the compensating gauge has a remarkable temperature difference with the current environment temperature; the actual temperature of the strain gauge and the compensating gauge is obviously lower than the environment temperature, so that the strain gauge and the compensating gauge are respectively in an ideal temperature range, and the force measurement precision of the pull pressure sensor is ensured.

The invention discloses a multi-channel high-precision three-dimensional microcalorimeter, and belongs to the technical field of microcalorimeters, the multi-channel high-precision three-dimensional microcalorimeter comprises a support block, a furnace body is arranged above the support block, a heat insulation layer is arranged in the furnace body in sequence, a heating cylinder is arranged in the heat insulation layer, a heat uniformizing block is arranged in the heating cylinder, and the heat uniformizing block is arranged in the furnace body. The device comprises a heat uniformizing block, a heat measuring cavity is formed in the heat uniformizing block, a heat uniformizing block temperature sensor is arranged at the circle center of the heat measuring cavity, a plurality of heat measuring channels are arranged in the heat measuring cavity around the circle center of the heat uniformizing block at equal intervals, the distances between every two adjacent heat measuring channels are the same, and three-dimensional thermopiles are arranged on the outer walls of the heat measuring channels in a sleeving mode. The number of the heat measuring channels is at least three. According to the multi-channel high-precision three-dimensional microcalorimeter, multiple channels are arranged, multiple groups of experiments, especially comparative experiments, can be carried out at the same time, the experiment efficiency can be greatly improved, and the research and development progress of scientific researchers is accelerated.

The invention belongs to the field of photoelectric co-packaging, and particularly relates to a photoelectric co-packaging temperature control framework based on an embedded glass-based micro-channel. Independent lower-layer heat dissipation is carried out on a heat-sensitive component optical interconnection chip through an embedded glass-based micro-channel technology, an electric interconnection heat dissipation channel continues to use existing upper-layer heat dissipation, mutual isolation of two heat dissipation channels in the whole common packaging body is achieved, heat dissipation partition is achieved from a new dimension, and thermal crosstalk is avoided; the whole common packaging body dissipates heat at the upper layer and the lower layer, so that the effective heat dissipation area is greatly increased, and the heat dissipation capability of the packaging body is greatly improved; and the guidance quality of the heat dissipation channel is better through material selection and additional arrangement of the heat insulation layer. And a metal film temperature sensor can be additionally arranged, so that the temperature of a component can be monitored in real time, heat management regulation and control can be performed in a targeted manner, the temperature rise of a heating device and the heat contact efficiency between the micro-channels are balanced, and more efficient heat dissipation is realized.

The invention relates to the technical field of phase change energy storage and heat management, and provides a heat insulation-heat conduction integrated phase change composite material and a preparation method thereof. The preparation method comprises the following steps: S1, preparing heat-conducting layer precursor mixed slurry; s2, preparing a heat insulation layer precursor mixed solution; s3, respectively pouring the two solutions into customized molds, directionally freezing and freeze-drying; s4, carrying out thermal imidization; and S5, partially impregnating the phase-change material, and packaging the phase-change material in a skeleton of the heat-conducting layer aerogel by adopting a physical adsorption method. The calcium ion regulator is introduced into the heat insulation layer precursor solution, so that the pore diameter structure of the polyimide aerogel can be regulated and controlled, and the calcium ion regulator can be used as a bridge to connect the heat insulation layer and the heat conduction layer, so that the integrated design of the material is realized.

The present invention relates to the field of cable technology, and discloses a flame-retardant and wear-resistant charging pile cable and a preparation method thereof. The charging pile cable prepared by the present invention comprises a cable core, a heat insulation layer, a shielding layer, and an outer sheath layer. The outer sheath layer is made of thermoplastic polyurethane elastomer as the main raw material, with the addition of maleic anhydride grafted POE, reinforcing fillers, and composite flame retardants and other functional additives, so that the cable has excellent flame retardant and wear resistance. Among them, the reinforcing filler utilizes the synergistic effect between hexagonal boron nitride and polyimide containing siloxane segments and long-chain fluorocarbon structures to improve the wear resistance of the outer sheath layer. The composite flame retardant has higher flame retardant efficiency than traditional inorganic flame retardants.

An apparatus for sampling landfill gas from a landfill flowing through a pipe. The apparatus may comprise: an enclosure configured to receive a section of the pipe; a gas sampling port in the section of the pipe; at least one sensor device disposed in a region of the enclosure, the at least one sensor being coupled to the section of the pipe through the gas sampling port; and thermal insulation positioned to retain heat from the section of the pipe in the region of the enclosure. A method of operating a landfill gas recovery system. The method may comprise: flowing gas from a well riser pipe through a sampling subsystem to a collection system; and heating a portion of the sampling subsystem with the gas flowing from the well riser pipe to the collection system.

The invention relates to the technical field of new energy automobile charging cables, and discloses an oil-cooled high-power liquid-cooled charging pile cable and a preparation process thereof, and the oil-cooled high-power liquid-cooled charging pile cable comprises a first main core cable, a second main core cable, a thermal insulation layer wrapping the peripheries of the first main core cable and the second main core cable, and a sheath layer wrapping the thermal insulation layer. A liquid cooling oil outlet pipe is arranged in the center of the first main core cable, a conductor wraps the outer side of the liquid cooling oil outlet pipe, an insulating layer wraps the outer side of the conductor, a liquid cooling oil supply pipe is arranged below the outside of the first main core cable, and the liquid cooling oil supply pipe and the liquid cooling oil outlet pipe form a closed loop. A filling layer is arranged outside the liquid cooling oil supply pipe and the first main core cable, and the liquid cooling oil outlet pipe is used for cooling the conductor. According to the oil-cooled high-power liquid-cooled charging pile cable, the overall heat dissipation effect is better and stable, the corresponding weight is light, and the experience of a charging user is improved.

The present invention discloses a heat-insulating, sun-proof and self-cleaning multifunctional glass and a preparation method thereof, wherein the multifunctional glass comprises a modified glass substrate and a photochromic heat-insulating layer and a surface functional protective layer sequentially compounded on the surface of the modified glass substrate; the surface functional protective layer comprises a super-hydrophobic nanostructure layer and a self-cleaning functional layer sequentially arranged from the inside to the outside; the photochromic heat-insulating layer is a photothermal response layer with a gradient doping distribution of tungsten oxide nanoparticles, wherein the doping density of the tungsten oxide nanoparticles close to the side of the modified glass substrate is low, and the doping density of the tungsten oxide nanoparticles far from the side of the modified glass substrate is high; the super-hydrophobic nanostructure layer is mainly composed of fluorosilane-modified SiO2 nanoparticles; the self-cleaning functional layer is a TiO2 film deposited on the surface of the super-hydrophobic nanostructure layer by plasma enhanced chemical vapor deposition. Compared with the prior art, the glass of the present invention has multiple functions such as excellent heat insulation, sun protection and self-cleaning.

The invention discloses a preparation method of a tinned copper core fluorinated ethylene propylene insulated cable for aerospace, and relates to the technical field of aerospace cable preparation methods. The preparation method comprises the following steps: S1, preparing a nickel-plated copper core; s2, preparing a heat insulation layer; s3, a composite insulating layer is prepared, the composite insulating layer is composed of a first insulating layer, a second insulating layer and a third insulating layer from inside to outside, the first insulating layer is a fluorinated ethylene propylene layer, the second insulating layer is a polyimide / fluorinated ethylene propylene composite layer, and the third insulating layer is a polyether-ether-ketone layer; s4, preparing a shielding layer; and S5, preparing a protective layer. The invention provides the preparation method of the tinned copper core fluorinated ethylene propylene insulated cable for aerospace, the insulated cable prepared by the preparation method has high performance and high reliability in an extreme aerospace environment, and all key requirements of electrical performance, radiation resistance, mechanical strength and wear resistance are comprehensively met.

The invention relates to the technical field of thermal control of spacecrafts, and particularly provides a high-thermal-stability temperature control structure of a space camera main system, which comprises a first thermal insulation layer, a second thermal insulation layer, a third thermal insulation layer and a truss, and is characterized in that the first thermal insulation layer covers the inner wall of the space camera main system and has high solar spectrum absorptivity and high infrared spectrum emissivity; the second heat insulation layer wraps the outer wall of the space camera main system and has low solar spectrum absorptivity and low infrared spectrum emissivity; a truss is further installed on the outer side of the space camera main system in the circumferential direction, a third heat insulation layer is arranged on the truss, and the third heat insulation layer has the low solar spectrum absorption rate and the high infrared spectrum emissivity. The multi-stage thermal insulation structure is utilized to improve the inhibition capability of the camera main system temperature control structure on the influence of the external thermal environment, and the influence of external heat flow change on the temperature stability of the camera main system is effectively reduced.

The invention relates to the technical field of cables, and discloses a flame-retardant wear-resistant charging pile cable and a preparation method thereof. The charging pile cable prepared by the invention comprises the cable core, the heat insulation layer, the shielding layer and the outer sheath layer, the outer sheath layer is prepared by taking a thermoplastic polyurethane elastomer as a main raw material and adding functional aids such as maleic anhydride grafted POE, a reinforcing filler and a composite flame retardant, so that the cable has excellent flame retardance and wear resistance; wherein the reinforcing filler utilizes the synergistic effect between hexagonal boron nitride and polyimide containing a siloxane chain segment and a long-chain fluoroalkyl structure, so that the wear resistance of the outer sheath layer is improved; compared with a traditional inorganic flame retardant, the composite flame retardant is higher in flame retardant efficiency.

The invention provides a thermal management photovoltaic glass pane comprising a photovoltaic glass, a thermal insulation layer coated on a front surface of the photovoltaic glass wherein the thermal insulation layer comprises a passive radiation cooling coating material; the sound insulation and heat insulation module comprises vacuum glass, hollow glass or a combination of the vacuum glass and the hollow glass, and the vacuum glass, the hollow glass and the combination are adhered to the rear side of the photovoltaic glass. The photovoltaic glass module not only optimizes solar power generation through a specific thermal management design, but also minimizes heat transfer and noise invasion into a building, keeps a quiet and stable internal environment, and minimizes the influence of an external environment.

The present disclosure relates to structure of a coil, a method of winding a coil and a transformer. The present invention also relates to a method for production of the medium voltage instrument transformer primary coils insulation. A method of winding a coil comprising steps of winding a layer of a wire on an insulation other than epoxy resins such that the layer of the wire pushes an excess adhesive towards an edge of the coil and placing the layer of insulation on the layer of the wire, wherein steps a) and b) are performed at least once. A coil suitable for being used in transformers comprising at least one layer of a wire, wherein the wire ends with a terminal on each end, wherein the terminal is placed such that it may be connected to, at least two layers of an insulation, wherein the layer of the wire is placed between two of the at least two layers of the insulation, wherein the layer of insulation is a tape with one or both sides coated with an adhesive comprising a carrier, preferably a film, even more preferably made of PET, PVC, PP, PEN, paper or paper composite, adhesive layers, preferably acrylic, silicone or rubber, or the insulation is thermally activated adhesive tape, or the layer of insulation is an adhesive tape. A transformer comprising a first coil, a second coil and a core placed inside of the at least two coils, wherein the first coil is the coil according to the present invention, and preferably the second coil is also the coil according to the present invention.

The invention discloses a sodium ion secondary battery with a multi-cavity packaging structure and a thermal runaway protection method thereof, the sodium ion secondary battery comprises a main cavity, a thermal runaway pressure relief channel arranged on one side of the main cavity and a composite protection layer arranged on the outer wall of the main cavity, and the thermal runaway pressure relief channel is filled with a phase change material and a fire extinguishing medium storage bag. The auxiliary cavities are respectively four peripheral sub-cavities and one central sub-cavity, and an independent sodium ion battery cell unit is packaged in each peripheral sub-cavity and each central sub-cavity. The internal temperature of each sub-cavity is monitored through a temperature sensor, an electric isolation module is triggered to cut off a circuit of the sub-cavity, meanwhile, perfluorohexanone gas in a fire extinguishing medium storage bag is released, and a basalt fiber woven layer is activated to be unfolded to form cooling fins. A four-stage thermal runaway protection system is constructed through multi-cavity physical isolation, thermal diffusion delaying of a double-layer thermal insulation layer, cooperative fire control of a phase change material and a fire extinguishing agent, dynamic heat dissipation of a composite protection layer and active response of intelligent sensing and shape memory alloy.

The invention provides a device and method for exciting liquid oxygen phase change blasting through combustion of a non-static flammable adsorbing material, the device comprises a flexible pipe cavity filled with liquid oxygen, a liquid filling pipe, a flammable medium and a grounding wire are arranged in the flexible pipe cavity, and the flexible pipe cavity is composed of a base material layer, a heat insulation layer and an anti-static layer. Static electricity is eliminated by arranging the grounding wire and the anti-static layer; the heat insulation layer is arranged to reduce heat loss; by using the combustible medium prepared from agricultural and forestry wastes, the cost is reduced, and resource reutilization is realized; and through the special design of the liquid filling pipe, the combustible medium quickly and uniformly absorbs liquid oxygen, and the rock breaking efficiency is improved. The problems of electrostatic potential safety hazards, poor heat insulation performance and high combustible medium cost in an existing liquid oxygen blasting technology are solved, and the method has the comprehensive advantages of being safe, efficient, economical and environmentally friendly.

The invention discloses an aging test system and a batch aging test method thereof, and relates to the field of chip aging test. The system comprises at least two test boxes, a plurality of grooves are formed in the outer surface of the top of each test box and coated with heat insulation layers, and two through holes are formed in each groove; a heating module is arranged in the test box; each aging test board comprises a first board surface provided with a measurement and control module; the second plate surface is provided with two parallel interface modules which are electrically connected with the measurement and control module through pins, and each interface module is connected with a test seat for inserting a chip to be tested; the interface module is embedded in the test groove and abuts against the heat insulation layer, and the test seat penetrates through the through hole and is placed in the cavity of the test box. Each output end of the temperature adjusting module is connected with the two test boxes through a conveying pipeline; the controller is electrically connected with the heating module, the measurement and control module and the temperature adjusting module. The service life of the aging test board can be effectively prolonged, and the reliability of the temperature cycle aging test is improved.

The application discloses a kind of low thermal conductivity high reflectivity five-element co-doped ceramic laser protection coating and preparation method thereof, belong to high-energy laser protection technical field.The protective coating includes the adhesive layer and the reflective heat insulation layer of laminated arrangement, adhesive layer is arranged on the surface of base material, reflective heat insulation layer is arranged on the surface of adhesive layer;Wherein, adhesive layer is formed by spraying one of Ni-Al self-bonding powder, Ni-Mo-Al, NiCrAlY, CoCrAlY and NiCoCrAlY;Reflective heat insulation layer is the ceramic coating of five-element co-doped ZrO2, in ceramic coating, base element is ZrO2, doping component is:Y2O3, Gd2O3, Yb2O3, TiO2 And Ta2O5, after doping, material is single cubic phase structure at 25 ℃-1600 ℃.By multiple oxide doping to ZrO2, the coating can maintain cubic phase at room temperature while having lower thermal conductivity and higher reflectivity, can solve the problems of oxidation reflectivity reduction of metal material, mass loss of ablation material and insufficient heat insulation capacity of heat insulation material in laser protection field, prolong service life.

The invention belongs to the technical field of stealth materials, and relates to a radar-infrared compatible stealth composite material and a preparation method thereof, after an infrared shielding reflecting layer and a wave-absorbing heat-insulating layer with laser etching patterns are prepared respectively, the infrared shielding reflecting layer and the wave-absorbing heat-insulating layer are assembled together through glue, and the radar-infrared compatible stealth composite material with a double-layer structure is obtained. According to the invention, the shape of the periodic unit is redesigned, and the periodic unit is matched with the size of the periodic unit and the laser etching gap, so that the infrared emissivity is further reduced while the radar wave transmissivity is further improved. Furthermore, the aerogel is adopted as a wave-absorbing and heat-insulating layer of the composite material, the low heat conductivity coefficient of the aerogel can effectively prevent heat transfer, the upper surface temperature of the material is remarkably reduced, infrared signal radiation is inhibited, the infrared stealth effect of the composite material is improved, meanwhile, the function of attenuating radar waves transmitted from the top layer is achieved, and the infrared stealth effect of the composite material is improved. And efficient radar-infrared compatible stealth performance is realized.

The invention relates to the technical field of cable manufacturing, and discloses a low-carbon environment-friendly low-voltage fireproof cable which sequentially comprises a cable core, a metal heat transfer layer, a ceramic halogen-free low-smoke heat insulation layer, a metal fire blocking layer and a halogen-free low-smoke outer sheath layer from inside to outside. The cable core comprises a plurality of insulating wire cores and a ceramic halogen-free low-smoke flame-retardant material filled in external gaps of the insulating wire cores, each insulating wire core sequentially comprises a conductor, a high-temperature-resistant mica layer and an insulating layer from inside to outside, the high-temperature-resistant mica layer is tightly coated on the surface of the conductor, and the insulating layer is coated on the surface of the insulating layer. The insulating layer is made of a ceramic silicone rubber material, and the ceramic halogen-free low-smoke flame-retardant material and the ceramic halogen-free low-smoke thermal insulation layer both contain inorganic filler capable of forming a ceramic hard shell at high temperature. According to the cable, by adopting a combined structure of the high-temperature-resistant mica layer and the ceramic silicone rubber insulating layer, the fireproof grade of the cable is improved.