331 results about "Whisker" patented technology

The invention discloses a high-strength and high-toughness aluminum nitride ceramic and a preparation method thereof, and relates to the technical field of ceramics, a sol-gel method is adopted to coat the surface of aluminum nitride with a stable shell layer to form a core-shell structure, meanwhile, the low lattice mismatch rate of a core-shell interface is utilized to reduce thermal resistance, and toughness and thermal conductivity are both considered; according to the external magnetic field tape casting method, the magnetic dipole moment orientation principle is utilized, an external magnetic field is applied in the tape casting stage, the in-plane mechanical property is improved, and the fracture toughness is improved through the magnetism of aluminum nitride whiskers; a reinforcement is introduced to improve the mechanical property and corrosion resistance of the aluminum nitride ceramic material, multi-granularity powder is compounded, large-particle aluminum nitride powder is used as a sintering and heat-conducting framework material, and high activity provided by submicron particles is utilized to promote sintering, so that the sintering temperature of aluminum nitride can be remarkably reduced, and the performance is greatly improved; and the aluminum nitride substrate expands more application fields on a future packaging circuit.

The invention discloses a preparation method of a textured silicon nitride ceramic substrate, and belongs to the technical field of ceramic products. Beta-silicon nitride whiskers with the long diameter of 4-15 microns and the short diameter of 1-3 microns are added into silicon nitride ceramic slurry according to the design, and when the whiskers containing beta-silicon nitride pass through a scraper of a casting machine, the whiskers tend to be directionally arranged in the casting direction, so that a textured structure is generated in the silicon nitride ceramic substrate. The textured structure is beneficial to improving the three-point bending strength, the fracture toughness and the thermal conductivity in the horizontal direction of the ceramic substrate.

The invention relates to the technical field of titanium-steel composite plates, and particularly discloses a high-thermal-conductivity titanium-steel cold-rolled composite plate and a preparation method thereof.The preparation method comprises the steps that plasma etching treatment is conducted on a titanium plate, a TiB2-graphene heat conduction layer is arranged on the etched surface in a laser cladding mode, and an aluminum oxide whisker layer is deposited on a stainless steel plate through plasma electrolysis; the preparation method comprises the following steps: spraying nano-copper slurry on the surface of aluminum oxide whiskers, curing, carrying out composite rolling on a modified titanium plate and a stainless steel plate, and carrying out annealing and tempering treatment after rolling to obtain the high-thermal-conductivity titanium steel cold-rolled composite plate.

The invention relates to a nano silicon carbide whisker and a preparation method thereof, and the preparation method comprises the following steps: (1) carrying out acid process treatment on fly ash by using an acid solution, so that the content of key impurity elements in the fly ash accounts for 2-11% of the total mass of the treated fly ash, and obtaining acid-treated fly ash; (2) mixing the acid-treated fly ash with a first carbon source to obtain a mixture; and (3) covering the mixture with a second carbon source, roasting in a reducing atmosphere to obtain a roasted material which comprises a nano silicon carbide whisker layer and a total impurity layer positioned below the silicon carbide whisker layer, and removing the total impurity layer to obtain the nano silicon carbide whisker. According to the preparation method, the low-cost fly ash is taken as a raw material, the advantages of low preparation cost and relatively high product yield can be taken into account through the synergistic effect of moderate acid treatment, raw material position setting and roasting in the reducing atmosphere, and good morphology and relatively high purity of the nano silicon carbide crystal whiskers are ensured.

The invention relates to the technical field of functional board manufacturing, in particular to a damp-proof and wear-resistant composite board and a laminating process thereof. The composite material is prepared from 40-50 parts of dithiocar-bamate modified epoxy resin, 30-40 parts of nano silicon dioxide-carbon quantum dot modified polyurethane, 5-8 parts of a graphene-silane-metal organic framework compound, 2-4 parts of magnetic field oriented silicon carbide whiskers and 1-3 parts of self-repairing microcapsules. The modified epoxy resin is prepared from epoxy chloropropane and mercapto silane through a reaction, the graphene compound is embedded into the ZIF-8 nanoparticles, and the silicon carbide whiskers are directionally arranged through a 0.5-1T magnetic field during lamination; the plate is of a three-layer structure, covalent bonds are formed among layers through a silane coupling agent, and the plate has moisture-proof, wear-resistant and self-repairing functions. The composite material is low in water absorption rate, high in wear resistance frequency, high in microcrack repairing efficiency, high in interlayer bonding strength, capable of being stably used in high and low temperature environments, efficient in preparation process and suitable for the fields of high-end buildings, electronic equipment and the like, and the moisture-proof grade reaches IP67.

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 provides modified zirconium silicate whisker reinforced aluminum oxide ceramic as well as a preparation method and application thereof, and belongs to the technical field of new materials. The preparation method comprises the following steps: modifying the surface of alumina powder with a silane coupling agent with sulfydryl to generate zirconium silicate in situ, uniformly mixing the zirconium silicate with zirconium silicate whiskers which are treated by hydrogen peroxide and modified by phytic acid and tannic acid and a CeO2-Y2O3-MgO-SiO2 compound, and performing spark plasma sintering to obtain the modified zirconium silicate whisker reinforced alumina ceramic. The modified zirconium silicate whisker reinforced aluminum oxide ceramic prepared by the invention has better interface bonding force, excellent mechanical properties and good wear resistance, realizes ceramic densification, and has wide application prospects.

The invention relates to the technical field of corrosion-resistant materials for electrolytic baths, in particular to a corrosion-resistant material for an electrolytic bath and a preparation method of the corrosion-resistant material. The corrosion-resistant material for the electrolytic bath is prepared from the following raw materials in parts by weight: 100 parts of polypropylene, 18 to 22 parts of microcapsule coated calcium sulfate whiskers, 5 to 7 parts of polypropylene grafted maleic anhydride, 2 to 4 parts of boron nitride, 0.4 to 0.8 part of antioxidant and 0.4 to 1 part of lubricant. According to the corrosion-resistant material for the electrolytic cell, provided by the invention, the prepared corrosion-resistant material for the electrolytic cell has excellent corrosion resistance, good self-repairing capability and high comprehensive mechanical properties.

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 application relates to the technical field of ceramic materials, and provides a SiC-whisker-reinforced alumina ceramic material with whisker directional arrangement and a preparation method thereof. SiC whiskers are magnetically modified by being coated with cobalt, then the magnetically modified SiC whisker powder is mixed with Al2O3 ceramic slurry which has been ball milled, and sodium polystyrene sulfonate is added to the mixture for sufficient mixing in a dispersing machine. Then, an electric field and a magnetic field are simultaneously applied to the mixed solution, so that the SiC whiskers are turned under the action of the electric field and the magnetic field, and directional arrangement of the SiC whiskers in a certain direction is realized. The solution is immediately transferred into a freeze-drying machine to freeze and fix the directional arrangement, and then vacuum sublimation drying is carried out at low temperature, so that the Al2O3-Y2O3-SiC ceramic material with SiC whisker directional arrangement is prepared. w The mixed powder is subjected to hot-pressing sintering to prepare the SiC-whisker-reinforced alumina ceramic material with obvious whisker directional arrangement. The ceramic material can be used for preparing a ceramic cutting tool, and is used for high-efficiency cutting of a nickel-based high-temperature alloy.

The invention discloses a rotor coaxial heat dissipation structure, a fluorine-containing metal-based lubricating composition and application of cooperation of the rotor coaxial heat dissipation structure and the fluorine-containing metal-based lubricating composition in a motor rotor shaft, and the rotor coaxial heat dissipation structure and gradient functional coatings sequentially formed on the surface of the motor rotor shaft comprise a bottom layer used for leading out winding heat; the transition layer is used for solid lubrication and PFPE heat triggering slow release; the surface layer is used for reducing friction and repairing microcracks; a micro-pit array and a spiral flow guide groove which are machined through laser are formed in the outer portion of the surface layer. According to the invention, a gradient functional coating three-layer synergistic structure is adopted to construct a gradient framework of a bottom layer (a heat conduction band nano reinforced phase), a transition layer (oriented whiskers and slow-release lubrication) and a surface layer (magnetic response self-repairing), so that the problem that heat management, wear resistance and self-repairing functions of a traditional coating are difficult to be compatible is solved; and meanwhile, through the combined design of the laser micro-pit array (liquid storage and resistance reduction) and the spiral flow guide groove (strengthening the flowing of the cooling medium), the heat dissipation efficiency is cooperatively improved.

The invention discloses a method for preparing wave-absorbing integrated SiC / Si3N4 composite ceramic with high strength and toughness in a short period. Silicon nitride, silicon carbide, a sintering aid and other powder are mixed and dispersed for a short time through high-strength mechanical vibration, and the high-strength and high-toughness wave-absorbing composite ceramic is prepared after direct sintering. According to the preparation process, the preparation steps of ball milling, drying, sieving and the like are avoided, the preparation process period of the SiC / Si3N4 composite ceramic can be shortened from 1 week to 1 day, and the labor intensity is reduced; according to the preparation process, an organic solvent and a grinding medium do not need to be introduced, and pollution to samples and the environment is avoided; more importantly, the preparation process can effectively disperse the nano-powder and the whiskers, avoids the damage of a grinding medium to the powder such as particles and the whiskers, and enhances the strength and toughness of the ceramic material. The bending strength of the prepared SiC / Si3N4 composite ceramic can reach up to 1007 MPa, the fracture toughness reaches 11.63 MPa.m < 1 / 2 >, the minimum reflection loss of electromagnetic waves is-27 dB, and the wave absorbing bandwidth is 2.28 GHz.

The invention relates to the technical field of cutting pick machining, in particular to a high-temperature-impact-resistant PDC cutting pick preparation technology, it is guaranteed that the purity and the granularity meet the requirements through selection of raw materials, for example, silicon carbide whiskers and multi-walled carbon nanotubes have high high-temperature resistance, the high-temperature thermal stability of polycrystalline diamond compacts is greatly enhanced through addition of the silicon carbide whiskers and the multi-walled carbon nanotubes, and the high-temperature impact resistance of the polycrystalline diamond compacts is improved through addition of the silicon carbide whiskers and the multi-walled carbon nanotubes; the preparation method comprises the following steps: preparing raw materials, removing impurities on the raw materials through pretreatment to ensure the surface activity so as to facilitate subsequent combination, then removing the surface adsorption phenomenon of the raw materials and avoiding possible oxidation reaction through wet ball milling, sieving and reduction, and then carrying out preliminary forming through low-pressure pre-pressing to discharge air in the raw material powder and improve the pressing density; according to the high-temperature and ultrahigh-pressure sintering process for the polycrystalline diamond compact with the SiCw / CNTs added, the density and the shape of a green body are ensured, and then the finished PDC cutting pick meeting the requirement is obtained through high-temperature and high-pressure sintering, step-by-step pressure relief and finish machining.

The invention relates to the technical field of interface optimization of composite materials, and discloses an interface optimization method of a hollow micron silicon oxide sphere-aluminum nitride whisker composite material, which is applied to a material compounding system comprising a dispersity sensor and an interface regulation and control system in a hot pressing mold. The method comprises the following steps: acquiring spherocrystal dispersion data and interface stress data through a sensor to generate a data set, constructing a dispersion matrix by a regulation and control system, determining material interface combination characteristics, namely processing the matrix, performing thermal field distribution modeling, calculating thermal field distribution gradient and combination prediction information, constructing a coupling regulation and control model, outputting topological distribution characteristics and updating the data set. And finally dynamically regulating and controlling the composite parameters according to the combined characteristics. The method realizes real-time monitoring and accurate regulation and control of the composite material interface, improves the interface bonding quality and the material performance, and is suitable for interface optimization in the composite material preparation process.

The invention relates to the technical field of oil and gas exploitation, discloses a low-density high-strength ceramsite proppant as well as a preparation process and application thereof, and aims to solve the technical problem that the density and the strength of an existing ceramsite proppant are mutually restricted. The proppant has a core-shell structure with an inner core and an outer shell. The inner core is formed by sintering a first material containing bauxite, clay, a composite pore-forming agent and a carbon-silicon precursor and is used for forming a loose and porous low-density structure, and silicon carbide whiskers are generated in situ in the loose and porous low-density structure for reinforcement. The shell is formed by sintering a second material containing bauxite, clay and zircon sand and is used for forming a compact and high-strength protective layer and generating zirconium oxide particles in situ in the protective layer for toughening. The preparation process comprises the following steps: preparing core-shell structure green pellets by a two-step method, and adopting a double-atmosphere program temperature control sintering process of medium-temperature reduction and high-temperature oxidation. According to the invention, through the combination of the structure zoning and the zoning in-situ enhancement technology, the prepared proppant has ultralow density and excellent crushing resistance.

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.

The invention relates to the technical field of ceramic materials, and provides a high-strength protective plate for a ceramic slurry pump and a preparation method of the protective plate. The invention discloses a high-strength ceramic protection plate for a slurry pump. The high-strength ceramic protection plate comprises the following raw materials in parts by weight: 85-95 parts of silicon carbide, 3-5 parts of modified silicon carbide whiskers, 4-6 parts of petroleum coke powder, 6-8 parts of a binder, 3-8 parts of a sintering aid, 3-5 parts of a dispersant and 50-60 parts of water. Wherein the modified silicon carbide crystal whiskers are obtained by modifying silicon carbide crystal whiskers with 3-amino-2-hydroxyacetophenone. According to the technical scheme, the problem that the strength of the ceramic slurry pump protection plate is insufficient in the prior art is solved.

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 invention relates to the technical field of chute lining plates, and discloses a high-wear-resistance chute lining plate and a preparation method thereof.The high-wear-resistance chute lining plate comprises a chute lining plate body, and the chute lining plate body comprises a ceramic layer and a buffer layer; in the ceramic layer, a matrix is prepared from 35wt% of alpha-Al2O3, and a toughening phase is prepared from 7wt% of zirconium oxide whiskers and 4wt% of TiCN nanoparticles; the buffer layer is hydrogenated butadiene-acrylonitrile rubber, and the acrylonitrile content is 34%. According to the preparation method disclosed by the invention, through a three-stage technical route of component gradient design, gel precision forming and interface reaction regulation and control, strengthening and toughening, high-temperature performance optimization and multi-scale enhancement of the alumina-based ceramic are realized: macro-scale (zirconia whisker) + mesoscale (TiCN nanoparticles) + micro-scale (NiCr metal phase) cross-scale synergy is realized; and in-situ reaction: vacuum sintering at 1850 DEG C is utilized to trigger TiCN / NiCr interface reaction, a TiC-NiCr metal ceramic transition layer is generated, and the mechanism compressive strength is improved through a metal ceramic composite material, so that the chute lining plate has better impact resistance and wear resistance effects.

This invention discloses a whisker-reinforced aluminum nitride ceramic substrate with high thermal conductivity and high toughness, and its preparation method. The substrate comprises the following components by mass fraction: 1.5wt%~4wt% AlN single crystal whiskers, 4wt%~6wt% composite sintering aid, and the balance being AlN powder; the AlN single crystal whiskers undergo oxide layer removal treatment, and have an aspect ratio of 10~30. The preparation method includes: mixing the raw materials, mechanically stirring and ultrasonically dispersing them, adding a dispersant, binder, and plasticizer, ball milling to form a slurry, casting, drying, degreasing, and sintering at 1800~1880℃ in a nitrogen atmosphere at normal pressure to obtain a dense substrate. This invention, through extremely low whisker addition combined with oxide layer removal treatment, eliminates interfacial thermal resistance, achieving a thermal conductivity ≥250W / (m·K) and fracture toughness ≥4.0MPa·m. 1 / 2 The synergistic improvement in bending strength (≥550MPa) and the process compatibility with existing casting-atmospheric pressure sintering production lines make it suitable for electronic packaging fields such as SiC / GaN power devices and IGBT modules.

The invention provides an electrostatic chuck and a reaction chamber, the electrostatic chuck comprises an insulating layer and a heating body arranged at the bottom of the insulating layer, and the electrostatic chuck further comprises a cooling structure which is arranged below the heating body and is spaced from the heating body, and the cooling structure is used for transmitting heat of the heating body out through cooling liquid. According to the electrostatic chuck provided by the invention, stable temperature control on the heating body can be realized in the technological process, so that whisker defects can be effectively reduced, and the product yield can be further improved.

This invention discloses an Al(OH)3 modified calcium sulfate whisker / epoxy resin thermally conductive composite material and its preparation method, belonging to the technical field of thermally conductive composite material synthesis methods. The method involves adding calcium sulfate whiskers to an aqueous solution of urea and aluminum sulfate octadecahydrate, and obtaining Al(OH)3 modified calcium sulfate whiskers through heating and stirring. These whiskers are then dispersed in a mixed solution of epoxy resin and a curing agent, and the Al(OH)3 modified calcium sulfate whisker / epoxy resin thermally conductive composite material is prepared by casting. The prepared thermally conductive composite material has a dense internal structure, significant thermal conductivity, and good insulation properties. It can effectively dissipate and conduct heat to maintain the normal operating temperature and performance of electronic components. When used in electronic products, it can effectively guide heat outwards, reducing the risk of overheating during electronic component operation.

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.

This invention provides a high thermal conductivity composite material, its preparation method, and its application. The high thermal conductivity composite material includes a mesh metal layer and an in-situ grown indium whisker layer on the surface of the mesh metal layer. This invention grows indium whiskers in-situ on the surface of the mesh metal layer. The mesh metal layer has high thermal conductivity, indium has a low melting point and good ductility, and indium whiskers are easier to adhere to heat-generating elements compared to indium grains. The in-situ grown indium whiskers on the surface of the mesh metal layer increases the contact area between the thermally conductive material and the heat-generating element, enabling the heat-generating element to effectively dissipate heat and effectively solving the heat generation problem caused by insufficient heat dissipation efficiency of the heat-generating element.

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 SiC-coated C nano whisker material as well as a preparation method and application thereof. The preparation method of the SiC-at-C nano whisker material comprises the following steps: putting a substrate material into a deposition cavity of laser chemical vapor deposition equipment, vacuumizing the deposition cavity to 10Pa or below, introducing H2 and carrier gas carrying a precursor, adjusting the deposition pressure to a target value, and stabilizing the deposition pressure; and starting laser to heat the substrate material, raising the temperature of the substrate material to a deposition temperature and starting deposition, after deposition is completed, sequentially stopping introducing the precursor and the carrier gas, stopping laser, then stopping introducing H2, vacuumizing the reaction chamber to be below 20Pa, and after the substrate material is cooled to room temperature, taking out the substrate material. The SiC-coated C nano whisker material prepared by the method has excellent electromagnetic shielding performance and flexibility, is simple in process, short in period and easy to scale, and has a wide application prospect in the field of electromagnetic shielding equipment.