40results about How to "Low thermal diffusivity" patented technology

The invention relates to a method for preparing a high-hardness abrasion-resistant powder metallurgic roller sleeve, which is characterized in that the method adopts powder metallurgic technology for manufacture, and comprises the following steps: firstly, powder mixing, namely mixing iron powder, carbon powder, chromium powder or ferrochrome powder and a lubricant, and guaranteeing that the total composition comprises the following components in percentage by weight: 0.3 to 2 percent of carbon, 0.3 to 4 percent of chromium, not more than 2 percent of unavoidable impurities, and the balance being iron; secondly, forming, wherein the density after forming is more than 6.8g/cm; thirdly, sintering; fourthly, machine processing; fifthly, quenching; sixthly, cold treatment; and seventhly, tempering. Compared with the prior art, the method has the advantages that the product mainly comprises the iron, the carbon and the chromium and does not comprise noble metal element such as nickel, molybdenum and tungsten, so that the cost is low; the mechanical properties such as the tensile strength, the hardness and the microhardness of the product are superior to those of products obtained by casting technology; and both the thermal diffusivity and the thermal conductivity of the product are lower than those of the products obtained by the casting technology.

The invention discloses a preparation method for a high-performance thermal barrier coating and specifically discloses a 4YSZ (4mol% Y2O3 stabilized ZrO2) thermal barrier coating and the preparation method of the 4YSZ thermal barrier coating. The 4YSZ powder which is of a fine nano-structure, uniform ingredients and a pure tetragonal phase structure is prepared utilizing a sol-spray pyrolysis synthetic process, and the 4YSZ powder is subjected to spray drying granulation, screening and atmospheric plasma spraying (APS) in sequence to prepare the coating. The high-performance thermal barrier coating prepared by the invention is of a pure tetragonal phase nano-structure with uniform ingredients, compared with a traditional YSZ casting, the high-performance thermal barrier coating has the advantages of being low in thermal diffusion coefficient, good in high temperature phase stability and thermal shock resistance, simple in preparation process and low in cost and the like; and the high-performance thermal barrier coating is more conducive to improving the efficiency and working temperature of a turbine engine, and the service life of the engine is prolonged.

Disclosed are a method and system for removing scratches from a planar panel of translucent or transparent material, such as glass, without removal from its frame. A heat source supplying a controlled amount of heat is moved across the surface of the planar panel at a controlled velocity and at a controlled distance from the surface so as to progressively melt a thin surface layer at portions of the surface heated by the moving heat source. The melted material re-flows under surface tension to smooth scratches in the surface layer. Movement of the heat source is repeated over different portions of the surface until all scratched areas have been treated. The treated panels have a smooth surface with scratches removed, and have good optical and structural qualities.

The invention belongs to the technical field of a functional material, and relates to a novel heat dissipation insulating composite material and a preparation method therefor. Specifically, the novel heat dissipation insulating composite material consists of graphite, aluminum and ceramic, and adopts a sandwich structure, wherein a ceramic sheet layer is positioned in the middle, and graphite/aluminum composite sheet layers are positioned on the two sides; and the graphite/aluminum composite sheet layers consist of a graphite sheet layer with pores and aluminum for filling the pores. Integral forming of the graphite, metal aluminum and ceramic is realized by a high-pressure forging method to form the brand new composite material; the composite material has high thermal conduction, high insulativity and enhanced mechanical strength; and raw materials are low in coat, and the preparation method is simple and easy to implement, so that the composite material has high market competitiveness.

ARFID tag includes an inlet in which an antenna for communication and a circuit chip performing radio communication with the antenna are electrically connected to each other. The RFID tag further includes a thermal storage section which encloses the inlet, which is made of a nonmetal, and which prevents thermal diffusion into the inlet and a thermal insulating section which encloses the thermal storage section, which prevents thermal conduction to the thermal storage section, and which has higher thermal diffusivity than thermal diffusivity of the thermal storage section and lower thermal conductivity than thermal conductivity of the thermal storage section.

The invention relates to a ceramizable heat-preservation fireproof coating comprising the following preparation raw material components in parts by weight: 5 to 30 parts of high-temperature-resistant silicon resin, 35 to 75 parts of heat-preservation filler, 5 to 15 parts of other functional fillers, 2 to 5 parts of auxiliaries and 50 to 500 parts of a diluting solvent. According to the coating, high-temperature-resistant silicon resin is used as a matrix, and the heat-preservation filler and other functional fillers are added, so that the mechanical property, high-temperature resistance, weather resistance and other properties of the coating are improved, and the coating can be subjected to ceramization reaction at the high temperature of 500 DEG C or above, so that the coating can bear high-temperature heating of 1400 DEG C and cannot be burnt through for a long time; and moreover, the coating has relatively low thermal diffusivity, can provide better heat preservation capability when the temperature is rapidly changed, has a good protection effect when being applied to the field of lithium ion batteries, and effectively solves the problems existing in a protection material in the prior art.

The invention discloses a flame-retardant temperature-regulating environment-friendly non-woven fabric and a preparation method thereof. The preparation method comprises the following steps: graftingamino and nano-silver on the surface of a modified carbon nanotube, introducing the modified carbon nanotube into a non-woven fabric base material, grafting sulfydryl and hydroxyl on a temperature-regulating capsule to modify the modified temperature-regulating capsule, respectively preparing a cationic flame-retardant coating and an anionic flame-retardant coating, sequentially coating thenon-woven fabric base material with a modified temperature-regulating capsule coating, the cationic flame-retardant coating and the anionic flame-retardant coating, and adsorbing polyelectrolyte or nanoparticles with opposite charges between the coatings by utilizing intermolecular force between the coatings and the non-woven fabric base material. Thus, the non-woven fabric with flame-retardant and temperature-regulating functions is constructed within a nanoscale range, a core material in the prepared non-woven fabric temperature-regulating capsule is not prone to leakage, the adhesive force betweenthe coatings is good, the non-woven fabric is more washable, meanwhile, the non-woven fabric has a certain antibacterial function, and market requirements can be met.

The invention provides yttrium-doped zirconium oxide (YSZ) powder having a multistage nano structure. The powder has a flower-like structure, wherein the flower-like structure is a multistage nano structure formed by the self assembly of laminated polycrystalline structures; the inside is formed by the stacking of multiple layers of folded laminated polycrystalline structures; the maximum integral particle size of the flower-like structure does not exceed 15 mu m. The invention also provides a preparation method and application of the powder. According to the invention, the YSZ power having specific morphology is obtained and can be used in the field of thermal barrier coatings.

Disclosed is a method of manufacturing a thermoelectric material having high thermoelectric conversion performance at a wide temperature range. The method of manufacturing a thermoelectric material according to the present invention comprises the following steps: forming a mixture by mixing copper and selenium according to the following chemical formula 1: Cu_xSe; and forming the mixture by heat treating the mixture. In chemical formula 1, 2<x<=2.6. The thermoelectric material can include an induced nano DOT (INDOT) as a copper containing particle. Here, INDOT represents a particle with a diameter, for example, between 1 nanometer and 100 nanometers which is spontaneously generated during a thermal material formation process. This nano DOT, that is INDOT, can exist on a grain boundary of a semiconductor.

The invention discloses a nanofiber-based biomedical non-woven fabric and a preparation method thereof. Firstly, phase-change temperature-adjusting microcapsules are added into nuclear layer liquid offirst fibers, a large number of hydrophilic groups are introduced into the nuclear layer liquid to prepare fibers A with super-hydrophilic performance, and alkali liquor is used for preparing multiple holes in the surfaces of the fibers A, so that the binding force of the fibers A and antibacterial capsules is increased; and a spinning solution is modified through an electrochemical method, modified ceramic with anti-radiation and anti-bacterial capacity is added, second fibers with super-hydrophobic performance are obtained, and a first non-woven fabric and a second non-woven fabric are bonded through a bonding agent to obtain the biomedical non-woven fabric which has the phase change temperature adjustment capacity, the moisture absorption capacity, the anti-bacterial capacity, the blood repelling capacity and the anti-radiation capacity, while the wearing comfort of medical staff is improved, invasion of microorganisms and pathogens can be effectively resisted, and high practicability is achieved.

The invention discloses a powder metallurgy brake pad matched with a carbon-ceramic disc and a preparation method of the powder metallurgy brake pad. The components comprise iron powder, copper powder, flake graphite, graphene, ferrous sulfide powder, spherical chromium powder, molybdenum powder, ferrochrome powder, ferromolybdenum alloy powder, silicon carbide and titanium dioxide. The prepared iron-based brake pad is formed through the steps of powder mixing, pressing and sintering under oscillation pressure, and has the outstanding advantages that (1) the iron powder is high in strength, wide in source and low in price; (2) the graphene is uniformly distributed in the matrix and reacts with iron to generate pearlite, so that the strength of the matrix is further improved, and the friction coefficient stability and wear resistance at high temperature are improved; and (3) spherical hard particles are well combined with the interface of the iron matrix, and the damage to the carbon ceramic disc is small. The copper-based brake pad prepared through the method can be matched with the carbon ceramic disc to provide a stable and high friction coefficient and lower abrasion loss at a high speed, the service life of the brake disc is prolonged, and the copper-based brake pad is easy to prepare, low in cost and applicable to a high-speed railway train brake system with the speed of 350km/h or above.

The invention discloses an anti-skid anti-icing night visible asphalt pavement material and a preparation method thereof. The asphalt pavement material comprises the following components in parts by mass: 50-65 parts of steel slag coarse aggregate, 20-30 parts of steel slag fine aggregate, 10-15 parts of waste glass fine aggregate, 3-5 parts of filler containing a phase change material and 3.8-5.1 parts of modified asphalt. The preparation method comprises the following steps: mixing coarse and fine aggregates, and then respectively heating the coarse and fine aggregates, the filler containing the phase-change material and the modified asphalt; then putting the heated mixed aggregate into a stirring pot which is preheated in advance for stirring, and then sequentially and respectively adding the heated modified asphalt and the filler containing the phase-change material for stirring. The asphalt pavement material has good skid resistance and wear resistance, the thermal performance of the pavement is improved, and the icing resistance of the pavement is improved; meanwhile, the night visibility of the asphalt pavement is enhanced, the preparation process is simple, the cost is low, the source is wide, and high-added-value utilization of the steel slag and the waste glass is realized.

The invention discloses an open-type thermal buffering device and method. The open-type thermal buffering method comprises the steps that materials with anisotropic thermal diffusivity are subjected to stretching and transformation; and the stretched plate-type materials are subjected to annular deformation, and thermal diffusivity after the coordinate of the plate-type materials is transformed isobtained. According to the open-type thermal buffering device and method thereof, acute change of the exterior temperature can be smoothed, the average temperature of the outside world is quickly achieved, and the open-type thermal buffering device is not isolated with the outside world and can communicate with the outside world; and the open-type thermal buffering device is a passive device, energy saving and environmental protection are achieved, both thermal sources and cold sources are taken from the external environment, and the open-type thermal buffering device and method can be widelyapplied to the condition that periodic thermal pulses ate converted into uniform thermal flow.

Disclosed is a thermoelectric material with excellent thermoelectric conversion performance. The thermoelectric material includes a matrix having Cu and Se, a Cu-containing particle, and an Ag-containing structure.

The invention discloses a titanium alloy casting benching method. During the line drawing, the correction needs to be strictly carried out according to the processing reference, other processing surfaces are considered, and the wall thickness after the processing needs to be uniform; when casting defects are discovered, remediation measures need to be taken for remediation; during the shaping, generally, large surfaces are knocked, and meanwhile, the force cannot be too strong; during the hole drilling, the feeding quantity needs to be small, the feeding speed needs to be uniform, when the cutting resistance is increased or the cutting chip shape and color abnormity is discovered, a drill bit needs to be replaced in time, or the cutting edge needs to be ground again; a screw tap trimming and grinding method is adopted, the screw tap calibration part is trimmed to be narrow, the bottom hole diameter is increased by 0.1mm, the uniform and slow manual tapping is adopted, the sufficient cooling liquid is maintained, and qualified titanium alloy parts are processed. The titanium alloy casting benching method has the advantages that the cutting chip bonding is reduced, the tapping difficulty is reduced, the durability of the drill bit is improved, the quality of the processed parts is improved, the dimension precision is ensured, the processing efficiency is effectively improved, and the production cost is reduced.

An in-situ synthesis process for preparing complex-phase TiN/O'-Sialon material features that the cheap TiO2 is used as the reinforcing phase, which reacts on other raw materials in clacination procedure to self-grow TiN in situ, and the complex-phase TiN/O'-Sialon material is synthesized by one step. Its technological steps include sieving, precalcining, proportioning, wet grinding, ultrasonic vibration, drying, die pressing, isostatic pressure shaping and high-temp. calcining. Its advantages include excellent comprehensive performance, uniformly distributed small TiN particles having good compatibility with base phase, low cost and simple process.