516 results about "Whisker" patented technology

The invention relates to the technical field of nano ceramic materials, and discloses a high-strength nano aluminum oxide ceramic product and a preparation process thereof.The preparation process comprises the following preparation steps that aluminum oxide powder, a composite binder, composite gel, a plasticizer and a solvent are mixed and subjected to ball milling, and composite slurry is obtained; placing the composite slurry in a mold, and performing mold pressing and drying to obtain a green body; and putting the green body into a high-temperature sintering furnace, carrying out high-temperature sintering, and cooling to room temperature to obtain the nano aluminum oxide ceramic product. Nano zirconium oxide and nano magnesium oxide are formed on the surfaces of the pretreated silicon carbide whiskers, and can form a solid solution with nano aluminum oxide in the sintering process to serve as a bridge of the silicon carbide whiskers and nano aluminum oxide particles, so that the binding force of the silicon carbide whiskers in a nano aluminum oxide ceramic matrix is remarkably enhanced; phosphoric acid and aluminum ammonium sulfate are firmly combined on the surfaces of nanometer aluminum oxide particles through carboxymethyl cellulose, and the situation that phosphoric acid and aluminum ammonium sulfate are not firmly combined with the nanometer aluminum oxide particles is avoided.

The invention relates to the technical field of ceramics, and particularly discloses a preparation method of a bamboo charcoal pot ceramic material, which comprises the following steps: weighing the following raw materials in parts by weight: 25-30 parts of bamboo charcoal powder, 20-25 parts of quartz powder, 10-15 parts of silicon carbide, 10-14 parts of a whisker readjustment-based bonding agent, 8-12 parts of albite, 7-11 parts of a magnesium oxide-doped modified filling agent and 5-10 parts of clay. According to the bamboo charcoal pot ceramic material disclosed by the invention, the bamboo charcoal powder is matched with the quartz powder, silicon carbide, albite and clay raw materials, and the impact resistance, the heat-conducting property and the wear-resisting property of the product are harmoniously improved by adding the continuous balance agent based on whisker readjustment and the filling agent modified by doped magnesium oxide and blending and matching the raw materials; and the product has remarkable cold and heat resistance and scrubbing stability.

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 power cables, and provides a medium-voltage fireproof cable, which comprises a conductor, and an insulating layer, an armor layer and a sheath layer which are sequentially arranged outside the conductor, the insulating layer comprises the following components in parts by weight: 70-80 parts of polyethylene, 5-10 parts of a flame retardant, 3-5 parts of a cross-linking agent, 1-2 parts of a plasticizer and 1-3 parts of an antioxidant; the sheath layer comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 8-16 parts of a flame retardant, 1-2 parts of a plasticizer, 1-3 parts of an antioxidant and 5-10 parts of filler; the filler comprises silicon dioxide, inorganic fibers and tetrapod-like zinc oxide whiskers. According to the technical scheme, the problem that the strength and the aging resistance of the cable in the prior art are poor is solved.

The invention belongs to the technical field of whisker material growth and ceramic substrate preparation, and discloses a preparation method of an aluminum nitride whisker and a high-strength and high-thermal-conductivity ceramic substrate, and the preparation method of the aluminum nitride whisker comprises the following steps: mixing aluminum powder serving as a raw material and ammonium salt serving as an inducer according to a mass ratio of (2: 1)-(1: 2); and carrying out heat preservation for 0.5-2 hours at the temperature of 800-1100 DEG C under the nitrogen and / or ammonia atmosphere condition, and carrying out nitridation reaction. According to the invention, a whisker and ceramic substrate synthesis method is improved, aluminum nitride whiskers with uniform morphology and length-diameter ratio are controllably synthesized through a rapid nitriding method, and the aluminum nitride whiskers and spherical aluminum nitride are sintered only by taking the aluminum nitride whiskers as an additive without the participation of additional sintering aids and reinforcers, so that the ceramic substrate is obtained. The high-strength and high-thermal-conductivity aluminum nitride ceramic substrate is obtained and has high mechanical strength and thermal conductivity.

The invention discloses a high-performance special ceramic material and a preparation process thereof, and the preparation process comprises the following steps: proportioning tungsten carbide, ternary boride, titanium nitride, molybdenum, nickel, silicon, cobalt and other raw materials with nano silicon carbide whiskers according to a ratio, carrying out ball milling treatment, adding a forming agent, and continuing ball milling and granulation; and then, carrying out compression molding on the ceramic powder, carrying out liquid phase sintering in a CO atmosphere, and cooling to room temperature to obtain the high-performance special ceramic material. The Mo3NiB3 ternary boride is introduced, so that the hardness and impact resistance of the ceramic material can be improved, the interface bonding force between a ceramic matrix and a reinforcing phase is enhanced, and the bending strength is improved; the nano silicon carbide whiskers are subjected to nickel plating treatment, so that the interface bonding force can be improved, microcracks are reduced, and the strength and toughness of the ceramic material are enhanced; by optimizing the sintering process and adopting a staged heating mode, grain growth can be controlled, and the density and mechanical properties of the ceramic material are effectively improved.

The invention discloses a diaphragm as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The diaphragm comprises a base membrane and a coating coated on at least one side surface of the base membrane, the coating comprises an inorganic adhesive and inorganic particles; the coating contains crystals formed by an inorganic adhesive; the crystals at least comprise needle-shaped crystal whiskers, part of the crystals jointly form a crystal whisker group, and the rest of the crystals are located among the inorganic particles; the inorganic adhesive comprises M2O.nSiO2 with the mass being 1%-35% of the mass of inorganic particles in the coating, M comprises at least one of Na, K and Li, and n is larger than or equal to 1 and smaller than or equal to 4. The diaphragm has good stability and durability at a high temperature, has relatively high peel strength, wettability, ionic conductivity, puncture strength and air permeability, and can ensure that the battery still can operate safely and efficiently at a high temperature. The preparation method of the diaphragm is simple, is easy for industrial large-scale preparation, and has a relatively good industrial prospect.

The invention belongs to the technical field of transmission sheet materials, and aims to solve the problems that the service life of a clutch is affected and even potential safety hazards are caused due to poor comprehensive performance of an existing transmission sheet material for the clutch under the working conditions of high temperature, high stress and the like. In order to achieve the purpose, the invention provides a powder metallurgy transmission sheet material for a clutch and a preparation method of the powder metallurgy transmission sheet material. The powder metallurgy transmission sheet material for the clutch comprises, by mass, 55%-65% of high-purity atomized iron powder, 8%-12% of electrolytic copper powder, 4%-8% of hydroxyl nickel powder, 1.5%-4% of ferromolybdenum powder, 1%-3% of chromium powder, 0.3%-1.5% of lanthanum powder, 1.5%-3.5% of nanometer silicon carbide particles, 0.8%-2% of carbon fibers, 0.5%-1.5% of whisker-shaped aluminum oxide, 0.3%-1% of cellulose nanocrystals, 0.5%-2% of rare earth oxide, 2.3%-6% of a lubricating agent and 0.5%-1.8% of a binding agent. The comprehensive performance of the transmission piece for the clutch is greatly improved, the reliability and durability of the transmission piece in a complex mechanical environment are guaranteed, the service life is prolonged, and the safety risk is reduced.

The invention discloses an additive manufacturing method of high-toughness alumina whisker toughened zirconia ceramic, and relates to a forming method of whisker toughened zirconia ceramic. Based on a photocuring additive manufacturing technology and an ultra-fast high-temperature sintering technology, fast additive manufacturing of the high-toughness alumina whisker toughened zirconia ceramic is achieved. The steps of pre-dispersing, freeze-drying and non-contact stirring are matched, so that the photo-cured ceramic slurry with good alumina whisker dispersion and good printability can be prepared on the premise of not damaging the whiskers; the non-reactive diluent added in the resin formula serves as a thermoplastic resin solvent and can be discharged at a low temperature, so that uniform pore channels are formed in a matrix, subsequent discharge of pyrolysis gas of resin is facilitated, and generation of defects is reduced; the added thermoplastic polyimide is resistant to high temperature and can be reserved to a sintering stage, the high-temperature toughness of the green body is improved, and the semi-degreased green body is prevented from being broken in the ultra-fast high-temperature sintering process.

The invention provides a deposition ring, a deposition assembly and deposition equipment capable of improving deposition uniformity of a thick film. The deposition ring comprises a central part, an inner circular ring and an outer circular ring which are concentrically arranged at intervals in sequence from inside to outside; the inner circular ring is connected with the center part through a plurality of first supporting rods arranged at intervals and connected with the outer circular ring through a plurality of second supporting rods arranged at intervals. The deposition ring further comprises a plurality of connecting rods arranged at intervals, one ends of the multiple connecting rods are connected with the outer circular ring, and the other ends of the multiple connecting rods extend in the direction away from the deposition ring and are used for slidably connecting the deposition ring with an external structure. By means of the optimized structural design, when the deposition ring is used for thin film deposition equipment, the thin film deposition uniformity can be remarkably improved, heat distribution on the surface of a wafer can be improved, and surface defects such as whiskers can be reduced. By adopting the deposition equipment with the deposition ring, the film deposition uniformity can be improved under the condition that process steps are not increased, the yield of the equipment is favorably improved, and the production cost is reduced.

The utility model discloses a liquid level float switch, which comprises a shell, a liquid level switch, a liquid level switch and a liquid level switch, the anti-reverse groove is formed in the shell; the fixing frame is inserted into the anti-reverse groove, and a storage area is arranged in the fixing frame; the steel balls are arranged in the storage area; the ballasting iron sand is arranged in the shell; the microswitch is arranged at the top of the fixing frame, and a cable of the microswitch sequentially penetrates through the ballasting iron sand and the bottom of the shell; the waterproof cover covers the fixing frame and the microswitch and is inserted into the ballasting iron sand; the epoxy resin fixes the waterproof cover, the ballasting iron sand, the fixing frame and the shell together. According to the utility model, the transparent special-shaped positioning waterproof cover is additionally arranged, so that water and gas can be prevented, a short-circuit fault caused by tin whiskers can be prevented, the top of the waterproof cover can be prevented from pressing a circuit through the positioning design of the waterproof cover, and the installation consistency is realized. And the problem of switch failure caused by reverse installation of the float switch is also solved.

The invention relates to the technical field of insulators, and provides a high-strength insulator and a preparation method thereof.The high-strength insulator is prepared from, by weight, 20-30 parts of aluminum oxide, 10-15 parts of kaolin, 6-10 parts of aluminum nitride, 15-20 parts of mullite, 5-10 parts of mica powder, 3-6 parts of titanium dioxide and 10-15 parts of modified silicon nitride whiskers; the modified silicon nitride whiskers are obtained by modifying silicon nitride whiskers with rare earth oxide. According to the technical scheme, the problem of low insulator strength in the prior art is solved.

The invention provides a whisker-based insulating anticorrosive coating and a preparation method thereof, and belongs to the technical field of insulating materials, the insulating anticorrosive coating comprises a component A and a component B. The component A comprises, by weight, 60-80 parts of an organosilicon modified copolymer, 0.5-2 parts of a dispersant, 0.5-5 parts of an antifoaming agent, 0.1-1.0 part of an adhesion promoter, 0.1-1.0 part of a film forming aid, 1-3 parts of a rheological aid and 20-40 parts of a filler; and the component B comprises 95-99 parts of a curing agent and 1-5 parts of a defoaming agent. According to the invention, the boron nitride whisker is subjected to hydroxylation modification and grafted into a long-chain structure of tetramethyl dihydroxy disiloxane, and then is subjected to a polymerization reaction with epoxy resin to obtain an organosilicon copolymer, so that the dispersity of boron nitride in a coating system and the flexibility of the coating system are effectively improved; the one-time film forming thickness of the insulating anticorrosive paint can reach the millimeter level by adopting a brush coating or spray coating mode, so that the requirement of high voltage resistance of the coating is met.

The invention belongs to the technical field of inorganic non-metallic materials, and discloses a method for microwave synthesis of silicon carbide whiskers from a porous precursor, which comprises the following steps: mechanically stirring and mixing a silicon source and a carbon source according to a carbon-silicon molar ratio of (3-25): 1, and obtaining the porous precursor by adopting a certain forming process and a certain pore-forming process; the porous precursor is wrapped with quartz powder and placed in a microwave sintering furnace to be sintered, a sample is subjected to heat preservation for 15-25 min at the temperature of 900-1350 DEG C, and the three-dimensional silicon carbide whiskers are prepared. A silicon source and a carbon source are mixed and molded in the form of a porous precursor and then are subjected to microwave heating, in the microwave heating process, excited microwave plasmas enter pores in a three-dimensional multidirectional form, gas in the pores is quickly accumulated under the action of buried powder, the air pressure is quickly increased, the plasmas are promoted to generate an instantaneous gas-phase reaction, and the pore-forming effect is improved. And the three-dimensional silicon carbide crystal whiskers with good crystal development are formed by virtue of sufficient space in the holes.

The invention relates to the technical field of metal processing, and provides high-strength anti-seismic support steel and a preparation method and application thereof.The high-strength anti-seismic support steel comprises a steel matrix and a reinforcing phase, and the steel matrix is prepared from, by weight, 0.35%-0.5% of C, 0.01%-0.03% of Si, 0.4%-0.7% of Mn, 0.001%-0.005% of S, 0.001%-0.004% of N, 0.02%-0.05% of Al, 0.001%-0.02% of Cu, 0.2%-0.5% of V, 0.01%-0.05% of Ti, 0.2%-0.8% of Cr, 0.3%-0.7% of Mo, 0.01%-0.1% of Nb, 0.005%-0.15% of Bi, 0.001%-0.01% of Dy and the balance Fe and inevitable impurities; the reinforcing phase is nitrogen-containing compound crystal whiskers. According to the technical scheme, the problem of low strength of an anti-seismic support in the prior art is solved.

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 discloses a high-thermal-conductivity insulating electric power engineering material and a preparation method thereof, and relates to the technical field of insulating material preparation. The composite material is prepared from 40-60 parts of polyimide resin, 20-30 parts of boron nitride nanosheets, 10-15 parts of alumina micro powder, 5-10 parts of a silane coupling agent, 3-8 parts of a plasticizer, 2-5 parts of an antioxidant, 1-3 parts of carbon nanotube whiskers, 1-2 parts of graphene quantum dots and 0.5-1 part of rare earth yttrium oxide. The diameter-thickness ratio of the boron nitride nanosheet is 100-200, the particle size of the alumina micro powder is 1-5 [mu] m, the diameter of the carbon nanotube whisker is 5-20 nm, the length is 1-5 [mu] m, and the particle size of the graphene quantum dot is 2-10 nm; all the raw materials are synergistically matched, so that the material is expected to have high thermal conductivity and excellent insulating property and is suitable for the field of electric power engineering. The material has high thermal conductivity and excellent insulativity, the thermal conductivity coefficient is not lower than 5 W / (m.K), the volume resistivity is not lower than 1015 omega.cm, and the breakdown field strength is not lower than 30 kV / mm.

The invention relates to the technical field of silicon carbide ceramics, in particular to a preparation method and a sintering device of a large-sized pressureless sintered silicon carbide ceramic tubing, and the preparation method comprises the following steps: uniformly mixing beta-type silicon carbide whiskers, graphite powder, boron carbide, a sintering aid, a dispersing agent, a binder and silicon carbide micro powder, then adding water, and stirring to prepare pug with the water content of 32-38%; pugging is conducted till pug with the water content being 8%-11% is obtained, and then the pug obtained after pugging is sealed and aged at the room temperature; carrying out extrusion molding on the aged pug through a vacuum extruder to obtain a ceramic tube blank; the ceramic blank pipe is fed into drying equipment to be dried; and sintering the ceramic blank tube in a nitrogen atmosphere at 1900-2150 DEG C to obtain the silicon carbide ceramic tube. By adding the beta-type silicon carbide whiskers, the silicon carbide micro powder, the sintering aid and other substances, the toughness and strength of the silicon carbide ceramic pipe can be enhanced, the wall thickness of the pipe can be reduced on the premise of keeping the same strength level, thermal resistance can be reduced, and the heat exchange efficiency of a heat exchanger can be improved.

The invention discloses a high-temperature-resistant and corrosion-resistant aluminum alloy material and a preparation process thereof, and relates to the technical field of aluminum alloy materials. The high-temperature-resistant and corrosion-resistant aluminum alloy material is prepared by carrying out micro-arc oxidation treatment on aluminum alloy, carrying out plasma spraying on a corrosion-resistant spray coating and carrying out heat treatment. The aluminum alloy comprises the following raw material components in percentage by weight: 0.05%-0.15% of silicon, 0.1%-0.2% of iron, 1.2%-1.5% of copper, 0.7%-0.9% of manganese, 2.5%-3.8% of magnesium, 10.2%-12.4% of zinc, 0.02%-0.04% of titanium, 0.08%-0.15% of zirconium, 0.2%-0.4% of scandium, 0.5%-0.8% of silicon nitride whiskers, 0.5%-1% of an aluminum-coated graphene material and the balance of aluminum.

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 a low-temperature sintered self-reinforced mullite whisker porous ceramic and a preparation method thereof. According to the preparation technology disclosed by the invention, the sintering temperature is successfully reduced while the toughening performance of the material is remarkably improved, which has an extremely important influence on reduction of the production cost and optimization of the material performance. The porous ceramic with an in-situ mullite whisker skeleton is prepared by combining an in-situ whisker generation method, a pore-forming agent adding method and a sintering aid method. The optimal synthesis process of the mullite ceramic is obtained by accurately regulating and controlling the raw material ratio, the sintering temperature and the pore-forming agent type. In addition, growth of mullite crystal nucleuses is promoted through the synergistic effect of the sintering aid and the whisker catalyst, and low-temperature sintering of the mullite ceramic is achieved. The invention aims to explore and realize an optimization method for low-temperature sintering, toughening and strengthening, so as to promote the development and application of the porous mullite ceramic in a plurality of application fields such as sound absorption, heat preservation, filtration and catalyst carriers.

The invention discloses stable zirconia high-toughness ceramic and a preparation method thereof.The stable zirconia high-toughness ceramic comprises a base material, a reinforcing phase and an interface transition zone, the base material is Y2O3-ZrO2 nano powder, the reinforcing phase comprises compact layers and porous layers which are alternately distributed, the compact layers enable alumina whiskers to be radially distributed in the radial direction, and the porous layers enable the alumina whiskers to be evenly distributed in the radial direction; a crystal whisker-nano particle-matrix three-stage toughening network is formed, a porous layer contains beta-Si3N4 crystal whiskers generated in situ, and an interface transition region is a ZrO2-beta-Si3N4 eutectic layer. According to the invention, the whisker is added, the fracture energy is consumed through the pull-out effect, the nano-particles inhibit crack propagation through the pinning effect, the matrix phase change is toughened, the fracture toughness of the ceramic is improved, and the crack propagation path is prolonged by 3-5 times. On the other hand, the sintering temperature is reduced, so that energy consumption is reduced.

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 belongs to the technical field of composite ceramics, and discloses a synergistically reinforced silicon nitride composite ceramic, and a preparation method and application thereof, the raw materials comprise the following components by mass: 40-90 parts of alpha-Si3N4; 8-15 parts of a sintering aid; 0.1 to 15 parts of nano TiN; 0.1 to 12 parts of SiCw (silicon carbide w); in the sintering aid, the mass ratio of Al2O3 to Y2O3 to CaF2 is (5-10): (1-5): (0.5-3). According to the invention, the nano TiN particles and directionally arranged SiCw are creatively added, and freeze drying and hot pressed sintering technologies are combined, so that the problem that strength and toughness of Si3N4 ceramic are difficult to synchronously improve in the prior art is solved, and the defect of poor toughening effect caused by random distribution of a whisker toughening phase in a matrix is overcome. By accurately regulating and controlling the microstructure, uniform dispersion and directional arrangement of a reinforcement phase are realized, the toughening potential of the whisker is fully exerted, and the comprehensive mechanical property of the Si3N4 ceramic is remarkably improved.

The invention discloses a fine whisker nickel-cobalt-manganese hydroxide precursor and a preparation method thereof, the product morphology can be regulated and controlled by regulating and controlling the temperature and the pH value of the particle size in the growth reaction stage on the premise of not introducing compressed air, the precursor product with fine whisker morphology and large specific surface is prepared, and the repeatability and controllability are good. And meanwhile, the lithium ion battery prepared from the precursor has excellent chemical properties, the first discharge capacity at 0.2 C is up to 207.4 mAh / g, and the first efficiency is up to 89.2%.

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.