177 results about "Whisker" patented technology

The invention relates to the technical field of electrode paste, in particular to electrode paste for a submerged arc furnace and a preparation method of the electrode paste. Comprising three-level grain size distribution anthracite aggregate which is electrically calcined at high temperature and modified by a KH-550 silane coupling agent, a modified silicon carbide whisker and boron-doped graphene-like carbon nitride composite filler, a maleic anhydride-mediated compatible medium-temperature pitch-polyborosiloxane binder and a graphite powder-borax functional additive. A step-by-step mixing and two-stage sintering process is adopted in the preparation process, a covalent bond interface bridging structure is constructed through the coupling agent, the composite dispersing agent regulates and controls the multi-dimensional network distribution of the filler, and the process synergistically improves the compactness and the interface bonding force of the green body. The electrode paste is firm in interface bonding, can form a ceramic protective phase at a high temperature, has excellent conductivity and mechanical strength, and prolongs the service life of the electrode paste for the submerged arc furnace.

The invention relates to a core-shell structure whisker toughened hard alloy. The core-shell structure whisker toughened hard alloy comprises a hard alloy matrix and a core-shell structure whisker, the core-shell structure whisker comprises a tungsten core part and an outer tungsten carbide shell layer. According to the core-shell structure whisker toughened hard alloy provided by the invention, the core-shell structure whiskers are added into the hard alloy, and the obdurability of the hard alloy is improved by utilizing the obdurability of the tungsten core part; the outer tungsten carbide shell layer is utilized, the hardness of the whisker is improved, the carbon content of a hard alloy system can be balanced in the sintering process, the wettability between the whisker and a hard alloy matrix is improved, sintering densification is promoted, and the interface bonding force between the whisker and the hard alloy matrix is improved. And finally, the strength and toughness of the hard alloy are improved on the premise of not obviously reducing the hardness of the hard alloy.

The invention discloses a high-bending-resistance and low-dielectric-loss LTCC substrate preparation method and an LTCC substrate, and the method comprises the steps: mixing inorganic powder, an organic system and a solvent through ball milling, dissolving and stirring, and preparing a green ceramic chip through a tape casting technology; carrying out lamination, warm isostatic pressing, cutting, glue discharging and sintering on the green ceramic chip to obtain the LTCC substrate; the inorganic powder comprises sodium borosilicate glass, aluminum oxide and mullite whiskers. According to the invention, the sodium borosilicate glass is used as a glass phase, the mullite whisker and the alumina powder are used as ceramic phases, and the excellent mechanical properties and extremely low dielectric loss of the mullite whisker are utilized to modify the sodium borosilicate glass-alumina composite material. The problems that an existing sodium borosilicate glass-aluminum oxide LTCC composite material is low in bending strength and high in dielectric loss are solved.

The invention discloses a whisker-reinforced composite porous ceramic material as well as a preparation method and application thereof, which are based on a new process of combining silicon carbide and cordierite and are combined with factors such as silicon carbide particle size and sintering conditions to really realize effective combination of low thermal expansion characteristic of cordierite and high strength characteristic of silicon carbide. The invention aims to synchronously improve the thermal shock resistance and mechanical bearing capacity of a product so as to provide a DPF filter body material with better performance. Furthermore, in order to optimize the filtering performance, mullite whiskers grow in the composite matrix in situ, and a more efficient particulate matter trapping network is constructed, so that the mechanical reliability, the thermal stability and the filtering efficiency are synergistically improved.

The application discloses a zinc oxide whisker heating furnace and a control method thereof, and belongs to the field of zinc oxide whisker production equipment. The zinc oxide whisker heating furnace comprises a furnace body, a whisker collecting groove and a lifting mechanism connected with a furnace cover. A zinc wire winding mechanism is rotatably connected to the furnace cover. The top end of a connecting rod of the whisker collecting groove is provided with a clamping groove, and the middle part is provided with an annular groove. A silicon carbide connecting rod is connected to the zinc wire winding mechanism, and the silicon carbide connecting rod is matched with the clamping groove. A rotating table is fixedly connected to a supporting frame. The rotating table is fixedly provided with a first electric telescopic mechanism extending towards the furnace body. The first electric telescopic mechanism is fixedly connected with a second electric telescopic mechanism. The second electric telescopic mechanism is connected with a clamping jaw matched with the annular groove. A controller is connected with the lifting mechanism, the rotating table, the first electric telescopic mechanism and the second electric telescopic mechanism. The scheme can realize automatic taking out and installation of the whisker collecting groove, and manual taking out with the aid of tools or waiting for the whisker collecting groove to cool down is not needed, so that the safety of zinc oxide whisker production is ensured.

This invention belongs to the field of cable technology, specifically a thin-walled oxygen-barrier high-temperature resistant cable, comprising a conductor core and a thin-walled outer sheath. The conductor core has a high-temperature resistant insulation layer made of polyetheretherketone (PEEK) composite material on its outer side. Between the high-temperature resistant insulation layer and the thin-walled outer sheath, from the inside out, are sequentially arranged a ceramicized oxygen barrier layer and a flame-retardant reinforcement layer. The ceramicized oxygen barrier layer is a nano-modified ceramicized silicone rubber layer with a thickness of 0.05–0.15 mm, including an outer layer doped with silicon carbide whiskers and an inner layer doped with zinc borate. This invention prepares an ultra-thin ceramicized layer through gradient doping, resolving the contradiction between thin-walled design and oxygen barrier properties, and effectively improving the interfacial peel strength. This reduces the cable's outer diameter and bending radius, making the cable lightweight and suitable for high-dynamic applications.

The application discloses a method for dynamically and continuously preparing a high-strength and stable ultrathin tin-based protective layer on a copper wire and a copper wire with the high-strength and stable ultrathin tin-based protective layer. The method comprises the following steps: the copper wire enters a deposition chamber through a plurality of vacuum differential pressure sealing transition chambers, an ultrathin nanocrystalline coating is deposited by using a Sn-Ge alloy target with a mass fraction of Ge of 0.2-0.6 wt%, then the ultrathin nanocrystalline coating is treated by on-line bombardment processing in an adjacent vacuum chamber by using 20-80 eV Ar / N2 mixed low-energy plasma, and finally the copper wire is taken out through the plurality of vacuum chambers and is wound on a take-up reel, so that the preparation is completed. Through the synergistic effect of Ge element pinning nanocrystalline and plasma surface layer densification, the unity of coating structure stability, tin whisker inhibition and oxidation resistance is realized, the conductivity of the copper wire is not substantially reduced, the dynamic and continuous production is adapted, and the method has relatively high industrial practicability.

This invention discloses a fissure grouting material, its preparation method, and its application, belonging to the technical field of radiation protection engineering materials. By mass, its raw materials include: 45-60 parts barite sand, 25-35 parts sulfoaluminate cement, 8-20 parts borax, 2-5 parts boron carbide powder, 1-5 parts nano-gadolinium oxide, 5-15 parts lithium slag powder, 3-8 parts barium sulfate whiskers, 3-8 parts polymer emulsion, 0.5-1.5 parts water-reducing agent, 0.1-0.5 parts stabilizer, and 18-25 parts water. This invention provides high-density gamma-ray shielding through barite sand, achieves all-round neutron protection through a quaternary composite neutron absorption system, enhances the material's toughness and shielding effect through barium sulfate whiskers, and ensures high fluidity and interfacial bonding strength of the grout through the polymer emulsion. This material is particularly suitable for sealing and shielding fissures in the surrounding rock of radioactive tunnels, possessing advantages such as excellent shielding effectiveness, good construction performance, high volume stability, and long-term durability.

The application discloses a device for preparing a textured ceramic cutter and belongs to the technical field of ceramic cutting tools. The device is characterized in that a ceramic core rod is placed in a circular table cavity, long strip beta-silicon nitride whiskers are added into ceramic slurry of the ceramic core rod, the ceramic slurry slowly flows into the circular table cavity under the action of gravity, the circular table cavity slowly rotates and slowly moves away from the ceramic core rod, the movement of the circular table cavity relative to the ceramic core rod is oblique movement, the ceramic core rod slowly covers the surface slurry under the action of the oblique speed of the circular table cavity, and the long strip beta-silicon nitride whiskers mostly present the same movement direction under the movement, so that the effect of texturing the outer structure of the ceramic cutter is achieved.

The present application belongs to the field of pipeline, disclose a kind of whisker reinforced double-wall corrugated pipe, by weight parts, including following raw material components: polypropylene 40~60 parts, polyethylene 40~80 parts, talcum powder 10~20 parts, stearic acid 1~5 parts, filler 15~20 parts, toughening agent 2~5 parts, lubricant 1~3 parts, antioxidant 1~5 parts, color masterbatch 5~10 parts, whisker 8~20 parts.The raw material of the present application is added in corrugated pipe, can be good to strengthen the use intensity of corrugated pipe, avoid rapid aging cracking.The present application further discloses a kind of whisker reinforced double-wall corrugated pipe production process, combination whisker corrugated pipe.

The invention discloses a preparation method of a SiC whisker reinforced niobium-based composite material, which comprises the following steps: 1) performing high-energy ball milling treatment on SiC whiskers and niobium alloy powder according to a formula ratio to obtain niobium alloy-SiC whisker composite powder; (2) forming and printing the niobium alloy-SiC whisker composite powder by adopting a laser directional energy deposition technology to obtain a SiC whisker reinforced niobium-based composite material; the method further comprises the step that the SiC whisker reinforced niobium-based composite material obtained in the second step is subjected to heat treatment. According to the method, impurity pollution in the ball milling process is avoided by adopting the agate ball milling tank, and alternate rotation is performed by adopting planetary ball milling, so that the risk of whisker breakage is reduced while uniform mixing of SiCw and niobium alloy matrix powder is ensured; and in combination with the rapid solidification characteristic of laser directed energy deposition (L-DED), whisker agglomeration and interface reaction are effectively inhibited, the high survival rate of SiCw in a niobium alloy matrix and tough interface construction are achieved, and then the mechanical property of the composite material is effectively improved.

The invention provides a high-toughness silicon carbide ceramic composite material and a preparation method thereof, and belongs to the technical field of ceramic composite materials. According to the method, the eutectic liquid phase is formed in situ through the yttrium-lanthanum double rare earth boride, and necessary conditions are created for subsequent reaction; in the environment, the TiBX-C precursor and the graphene quantum dot and silicon nitride composite powder are subjected to a synergistic reaction, and a multi-scale reinforced structure with titanium carbide / beta-silicon nitride whiskers and the like as a framework and boron carbide particles dispersed in the framework can be formed in the material; in the aspect of interface regulation and control, a carbon layer converted by the graphene quantum dots forms a relatively weak interface around the whiskers, so that the effects of pulling out the whiskers and the like are played, and formation of a two-dimensional boron nitride sheet layer is promoted to introduce a crack deflection effect; when the crack expands, the energy of the crack can be synergistically dissipated by particle pinning, crack deflection, whisker bridging, pulling out and other processes, so that the high toughness of the material is realized, and the material is suitable for the field of green special refractory ceramics.

The invention relates to the technical field of metal-based composite materials, in particular to a nanometer lanthanum hexaboride reinforced titanium-based composite material and a preparation method of the nanometer lanthanum hexaboride reinforced titanium-based composite material. The composite reinforcements are uniformly dispersed in the titanium alloy matrix; wherein the composite reinforcement is of a core-shell structure, the core of the core-shell structure is nano lanthanum hexaboride particles, and the shell layer of the core-shell structure is an in-situ reaction layer coating the outer surfaces of the nano lanthanum hexaboride particles; the in-situ reaction layer is a transition layer with components and a structure in gradient change, and the transition layer at least comprises a La / B-rich amorphous transition region and a TiB whisker layer which are distributed from inside to outside. According to the preparation method, low-energy mixing and spark plasma sintering are adopted, controllable in-situ reaction of nano LaB6 and Ti is induced, a LaB6 core and gradient reaction layer core-shell structure composite reinforcement is constructed, and nano La2O3 particles are separated out, so that reinforcement phase agglomeration is inhibited, interface bonding is improved, and the contradiction of strong plasticity inversion is solved.

The application discloses a fire-resistant smoke exhaust air duct and a preparation method thereof, and comprises a metal layer and a connecting layer arranged on the inner side of the metal layer; the metal layer is composed of a plurality of metal sheets which are fixedly connected through welding; the connecting layer comprises a separation groove and a filling fabric; the separation groove is composed of a plurality of concave hexagonal structures, and the filling fabric is uniformly filled in the separation groove; the filling fabric is made of glass fiber and ceramic fiber, and ceramic whiskers / dendrites are connected to the surface of the filling fabric; the surface of the ceramic whiskers / dendrites is attached with microcapsules which have a structure that chitosan is a shell layer and a carbonate material is a capsule core; thus, the connecting strength of the outer metal layer is effectively improved, the occurrence of cracking and loosening is reduced, the filling of the filling fabric and the microcapsules effectively improves the fire suppression, and the spread of the fire is avoided.

A powder metallurgy transmission plate material for a clutch, comprising in percentage by mass: 55%-65% of high-purity atomized iron powder, 8%-12% of electrolytic copper powder, 4%-8% of nickel hydroxide powder, 1.5%-4% of ferromolybdenum powder, 1%-3% of chromium powder, 0.3%-1.5% of lanthanum powder, 1.5%-3.5% of nano silicon carbide particles, 0.8%-2% of carbon fiber, 0.5%-1.5% of whisker-like alumina, 0.3%-1% of cellulose nanocrystals, 0.5%-2% of rare earth oxides, 2.3%-6% of a lubricating agent and 0.5%-1.8% of a binder. A transmission plate prepared by using the material component ensures the reliability and durability of the transmission plate in a complex mechanical environment, prolongs the service life of the transmission plate, and reduces safety risks. Also comprised is a preparation method for a powder metallurgy transmission plate material for a clutch.

The application provides a whisker-based insulating anticorrosive paint and a preparation method thereof, and belongs to the technical field of insulating materials. The insulating anticorrosive paint comprises component A and component B. According to weight parts, component A comprises 60-80 parts of organic silicon modified copolymer, 0.5-2 parts of dispersing agent, 0.5-5 parts of defoaming agent, 0.1-1.0 parts of adhesion promoter, 0.1-1.0 parts of film forming aid, 1-3 parts of rheological aid and 20-40 parts of filler; component B comprises 95-99 parts of curing agent and 1-5 parts of defoaming agent. The boron nitride whisker is hydroxylated and modified and grafted into the long chain structure of tetramethyl dihydroxy disiloxane, and then polymerized with the epoxy resin to obtain the organic silicon copolymer, so that the dispersibility of the boron nitride in the coating system and the flexibility of the coating system are effectively improved. The insulating anticorrosive paint adopts the brushing or spraying mode, and the film thickness can reach the millimeter level in one time, so that the high voltage resistance requirement of the coating is realized.

The invention belongs to the field of novel materials, and discloses an amorphous whisker material and a preparation method thereof, and the method comprises the steps of Fe-Cr-B cast steel hot dip coating of Al-Ga-Si alloy, diffusion heat treatment and ZnCl2 molten salt corrosion. Fe-Cr-B cast steel is subjected to Al-Ga-Si alloy hot dipping-diffusion heat treatment, then a periodic lamellar structure formed by alternately arranging Cr-(Al, Ga)-B MAB phase solid solutions and FeAl3 is generated on a (Cr, Fe) 2 / Al-Ga alloy melt solid-liquid interface, and after the cross section is subjected to polishing treatment, amorphous Al (Ga) solid solution whiskers can spontaneously grow on the Cr-(Al, Ga)-B MAB phase solid solutions; and then the plating layer of the periodic lamellar structure is immersed in ZnCl2 fused salt at the temperature of 450-750 DEG C for a certain time (0.5-2 h) and then taken out, and after the cross section is polished, amorphous (Al, Ga) 2O3 solid solution whiskers can be spontaneously grown on the Cr-(Al, Zn, Ga)-B MAB phase solid solution. According to the invention, a plurality of MAB phase solid solutions are prepared through a simple process, and different types of amorphous whiskers can spontaneously grow.

The application provides a preparation method of a tin-zinc-cerium composite material, comprising the following steps: A) ball milling tin powder, zinc powder and cerium powder under a protective atmosphere to obtain initial mixed powder; B) vacuum drying the initial mixed powder to obtain mixed powder; and C) forming the mixed powder by using a rapid forming process under a protective atmosphere to obtain the tin-zinc-cerium composite material. The application adopts the rapid forming process, a high cooling rate inhibits the precipitation of the zinc phase of the tin-zinc alloy, reduces the mechanical collapse of the formed piece caused by brittleness, and the introduction of cerium can effectively inhibit the oxidation of zinc, thereby improving the wettability in the soldering process. Meanwhile, cerium can also improve the creep resistance, thereby inhibiting the growth of alloy whiskers, so that the tin-zinc-cerium composite material has wide application prospects in the fields of low-temperature soldering technology and high-end chip pin densification.

The invention relates to the technical field of blanket processing, in particular to a production process of a tinned copper wire, which comprises the following steps: S1, removing oil by using an alkaline degreaser sodium hydroxide of 40 g / L, sodium carbonate of 30 g / L and lauryl sodium sulfate of 5 g / L, and carrying out ultrasonic cleaning for 5 minutes at the temperature of 60 DEG C, and S2, pickling by using a dilute sulfuric acid solution of 10%, and soaking for 2 minutes at normal temperature until the surface of the copper wire is bright yellow. The quality of a plating layer is remarkably improved, a methanesulfonate system plating solution (Sn 20-40 g / L and methanesulfonic acid 80-120 mL / L) is adopted to replace a traditional fluoroborate system, the plating solution is environmentally friendly, free of toxicity and high in stability, a special brightener is added, the current density (3-8 A / dm), the temperature (25-35 DEG C) and the linear speed (10-30 m / min) are controlled, it is ensured that the plating layer is fine in crystallization and uniform in brightness, tin whiskers or pores are avoided, and the plating layer quality is improved. A silane coupling agent (KH-550) is used for passivation (the concentration is 2%), a compact silicon oxide protective film is formed, the corrosion resistance is improved, the service life of the product is prolonged, and pretreatment is efficient and accurate.

The invention discloses dielectric adjustable graphene / ceramic composite aerogel and a preparation method thereof, and belongs to the technical field of functional composite materials. The preparation method comprises the following steps: S1, mixing a reduced graphene oxide dispersion liquid with a silicon carbide whisker dispersion liquid, and carrying out ultrasonic treatment and centrifugation to obtain a composite precipitate; s2, performing directional freezing treatment on the composite precipitate, inducing to form a three-dimensional communicated porous structure, and then performing freeze drying to prepare a graphene / ceramic composite aerogel precursor; and S3, performing chemical vapor infiltration on the graphene / ceramic composite aerogel precursor to prepare the silicon carbide protective layer. The preparation method is simple, and the prepared material has excellent performances such as light weight, high strength, dielectric adjustability and high-temperature oxidation resistance, has application prospects in the fields of aerospace thermal protection and the like, and solves the problems that in the prior art, SiC whiskers are damaged in the preparation process, and the service life of the SiC whiskers is prolonged. The mechanical property, the dielectric property and the high-temperature oxidation resistance of the composite aerogel are insufficient, and the like.

This invention provides a sandwich-toughened ceramic-based fuel element and its additive manufacturing method, belonging to the field of nuclear reactor fuel technology. The element includes an outer shell and an inner shell, with an annular gap between them forming a sandwich space containing a silicon carbide whisker toughening structure. The method includes: additively manufacturing a double-layer shell, the geometry of which can be flexibly designed; preparing the sandwich toughening structure, which can be formed by injecting SiC whisker slurry into the sandwich space and solidifying it, or by generating self-grown whiskers in situ within the sandwich space through heat treatment of a Si and C raw material system; subsequently performing chemical vapor infiltration pretreatment; completing fuel loading and opening end sealing; and further performing enhanced CVI densification treatment. This invention introduces a sandwich toughening structure without significantly increasing the structural complexity of the element, effectively improving the fracture toughness, crack resistance, structural stability, and service stability of SiC-based fuel elements.

The invention relates to the field of polytetrafluoroethylene tubes, in particular to a particle and whisker synergistically enhanced polytetrafluoroethylene tube and a preparation method thereof, which are used for solving the problems of low mechanical strength, poor wear resistance and insufficient thermal deformation resistance of a pure polytetrafluoroethylene tube. The preparation method comprises the following steps: ultrasonically dispersing polytetrafluoroethylene micro powder, stirring, adding polyimide resin, stirring, sequentially adding stainless steel coated graphite particles and silicon carbide whiskers, continuously stirring to obtain mixed powder, loading the mixed powder into a mold, maintaining the pressure, taking out a tube blank, sintering the tube blank in a sintering furnace, cooling, grinding and drying to obtain the polytetrafluoroethylene tube. The polyimide resin remarkably improves the tensile strength, the heat conductivity coefficient and the corrosion resistance of the pipe; the stainless steel coated graphite particles can effectively improve the tensile strength, the heat conductivity coefficient and the corrosion resistance of the polytetrafluoroethylene tube; the polytetrafluoroethylene tube has the comprehensive performance of high strength, high wear resistance and thermal deformation resistance.

The invention relates to the technical field of ceramic membranes, in particular to a silicon carbide whisker surface modified aluminum oxide particle ceramic membrane and a low-temperature in-situ synthesis method thereof. The silicon carbide whisker surface modified alumina particle ceramic membrane is prepared from the following raw materials in percentage by mass: 70 to 90 weight percent of alpha-Al2O3 powder, 5 to 15 weight percent of silicon source, 5 to 15 weight percent of carbon source, 1 to 5 weight percent of sintering aid and 0.1 to 1 weight percent of catalyst. On one hand, the initial synthesis temperature of the SiC whiskers is reduced by adopting the combined catalyst, and the method adapts to a low-temperature sintering schedule of an aluminum oxide ceramic flat sheet membrane. On the other hand, a low-temperature in-situ synthesis method for modifying the aluminum oxide particles on the surfaces of the silicon carbide whiskers is adopted, the aluminum oxide particles are wrapped by the SiC whiskers to form a core-shell structure, and the hydrophilicity and chemical stability of the aluminum oxide ceramic membrane are improved.

The invention discloses an iron-copper alloy-based friction plate and a preparation method thereof. The iron-copper alloy-based friction plate comprises the following raw materials in percentage by weight: 70-80% of iron-copper alloy powder, 7-15% of a friction reinforced phase composite material, 2-7% of a friction auxiliary material, 8-15% of a solid solution strengthening material, 0.7-1.5% of graphite and 0.5-1% of a lubricant, the friction reinforced phase composite material is a mixture of silicon dioxide, silicon carbide and aluminum oxide; the friction auxiliary material is a mixture of silicon-aluminum whiskers, calcium silicate whiskers, manganese-zinc alloy powder and carbon fiber powder; the solid solution strengthening material is zinc-tin-phosphorus alloy powder. The preparation method comprises the following steps: preparing materials; performing compression molding; sintering is performed; and machining and surface treatment. According to the invention, the raw material formulas cooperate with each other and cooperate with each step of the preparation method, so that the prepared product is good in wear resistance and stable in friction coefficient.

The invention discloses a method for synergistically improving modulus, obdurability and heat resistance of an aluminum-based composite material by utilizing a silicon carbide whisker network and an intragranular rare earth covering precipitated phase, and belongs to the field of aluminum-based composite materials. The problems that according to an existing silicon carbide whisker reinforced aluminum matrix composite, the segregation behavior of rare earth elements on various interfaces such as a reinforcement body / matrix and a precipitated phase / matrix cannot be accurately regulated and controlled while homogenization and refinement of a matrix structure are difficult to achieve, and a multi-stage reinforced structure with high thermal stability cannot be constructed are solved. The method comprises the following steps: 1, preparing a silicon carbide whisker precast block; 2, preparing an alloy melt; 3, extruding and infiltrating to prepare an aluminum-based composite material; and 4, a tandem heat treatment-hot extrusion-heat treatment synergistic process. The method is used for synergistically improving the modulus, obdurability and heat resistance of the aluminum-based composite material by utilizing a silicon carbide whisker network and an intragranular rare earth covering precipitated phase.

The invention discloses a carbon curing coating with electromagnetic wave absorption and radiation refrigeration functions and a preparation method of the carbon curing coating. The coating comprises a bottom coating and a surface coating, the bottom coating is prepared from the following solid raw materials: calcium silicate minerals with carbon curing activity, reduced graphene oxide modified nano Fe3O4 powder, nano TiO2 powder, SiC crystal whiskers, PVA (Polyvinyl Alcohol), silica fume and hydroxypropyl methyl cellulose; the surface coating is prepared from the following solid raw materials: calcium silicate minerals with carbon curing activity, nano TiO2 powder, nano BaSO4 powder, superfine hollow glass beads, SiC whiskers, PVA (polyvinyl alcohol), silica fume and hydroxypropyl methyl cellulose. The coating disclosed by the invention can realize synergism of functions of electromagnetic wave absorption, radiation refrigeration, high strength, high weather resistance, self-cleaning, low-cost manufacturing and the like, can be widely applied to outer wall panels of buildings and outer surfaces of containers of open-air electronic equipment, and has remarkable environmental benefits and popularization values.

The apparatus for isolating and detecting tin whiskers includes a substrate having a plurality of pads for connecting to electronic components disposed on the substrate, and a shield disposed on a surface of the substrate. The shield includes a plurality of cavities aligned over the plurality of pads. A plurality of sensing components, each associated with one of the plurality of cavities, are configured to detect electrically conductive growth from a corresponding pad of the plurality of pads. A plurality of circuit connections are each configured to connect one of the sensing components to a detection circuit. The detection circuit is configured to receive one or more sensing signals from one or more of the sensing components and detect electrically conductive growth from the corresponding pad based on the one or more sensing signals.

The application discloses a rotor coaxial heat dissipation structure and a manufacturing method thereof. The rotor coaxial heat dissipation structure is formed on the surface of a motor rotor shaft in sequence and comprises a gradient functional coating, which comprises a bottom layer for leading out winding heat, a transition layer for solid lubrication and PFPE heat-triggered slow release, and a surface layer for friction reduction and micro-crack repair. The surface layer is externally provided with a laser-processed micro-pit array and a spiral flow guide groove. The application adopts a three-layer collaborative structure of the gradient functional coating, constructs a gradient architecture of the bottom layer (a nano-enhanced phase for heat conduction) - the transition layer (directional whisker + slow-release lubrication) - the surface layer (magnetic response self-repairing), and solves the problem that the functions of heat management, wear resistance and self-repairing of a traditional coating are difficult to be compatible. Meanwhile, the combined design of the laser micro-pit array (liquid storage and drag reduction) and the spiral flow guide groove (strengthening the flow of cooling medium) cooperatively improves the heat dissipation efficiency.

The invention relates to the field of circulating fluidized bed boilers, in particular to a high-toughness high-plasticity wear-resistant coating for a circulating fluidized bed boiler and a preparation method of the high-toughness high-plasticity wear-resistant coating, and aims to solve the problems that a lining protective coating for a traditional circulating fluidized bed boiler is insufficient in toughness, easy to peel off and easy to wear. The long-period operation requirement of the circulating fluidized bed boiler is difficult to meet. According to the high-toughness and high-plasticity wear-resistant coating, tabular corundum, activated aluminum oxide, potassium silicate, silicon powder and nano silicon dioxide are used as main raw materials, an aluminum source and a silicon source are provided, mullite whiskers can be formed after sintering, and the strength and toughness of the material are remarkably enhanced; after the modified carbon nanotubes and the boron-silicon-doped phenolic resin are added, the mechanical property of the material can be further improved, so that the circulating fluidized bed boiler can meet stricter operation requirements when the inner wall of the circulating fluidized bed boiler is coated with the high-toughness and high-plasticity wear-resistant coating.

The invention discloses a porous mullite ceramic with a fiber structure and a preparation method thereof, and belongs to the field of preparation of porous ceramic materials. Research finds that aluminum-doped modified silica sol and AlF3 have a synergistic effect in the aspect of improving the mechanical property of the mullite porous ceramic, and the aluminum-doped modified silica sol is fused and enriched at a precursor contact point during sintering to form liquid-phase bridging; alF3 is decomposed at a high temperature to generate gaseous fluoride, so that anisotropic growth of mullite whiskers is promoted, and a three-dimensional interlocking network is formed. The mullite precursor can optimize the pore structure distribution, the porous mullite preparation method provided by the invention solves the problem that the pore structure is difficult to regulate and control flexibly in the traditional freezing casting process, the mechanical property of the porous ceramic is greatly improved, and the high porosity and the structural strength are superior to those of the porous ceramic prepared by freezing casting in the prior art.