134results about How to "High degree of homogenization" patented technology

The invention discloses an electromagnetic current coupling field assisted hybrid melting-brazing method for a laser-TIG arc and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of plasma formed through ionization of laser, arc and a raw material metal, thereby improving the laser utilization rate. Under the electric field assisted comprehensive effect, the weld melting depth is increased, and the assistant effect on the melting bath of the liquid-state brazing filler metal for laser-arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, stabilizing the welding process, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

A nano-ceramic particle reinforced aluminum foam matrix composite material and a preparation method thereof relates to an aluminum foam matrix composite material and a preparation method thereof. The invention solves the problem that in the preparation method of the ceramic particle reinforced aluminum foam matrix composite material, ceramic particles are micron-sized, the uniform distribution of nano-ceramic particles can not be realized, and the existing ceramic particle reinforced aluminum foam matrix composite material has wide aperture and low compressive yield strength. The aluminum foam matrix composite material of the invention is prepared from aluminum or aluminum alloy powder, CaCO3 and nano-ceramic particles. The preparation method comprises the following steps: using a ball mill to process raw material powder and stearic acid, mixing powder, then placing the mixture in a graphite mould to perform vacuum hot press sintering and obtain a perform, performing forward extruding to obtain a semi-finished product, heating and foaming to obtain the finished product. The aperture of the aluminum foam matrix composite material is less than 1mm, and the compressive yield strength is 50-98MPa which is 2-20 times of that of the existing aluminum foam matrix composite material. By using the method of the invention, the nano-ceramic particles can be uniformly distributed in the aluminum foam matrix composite material.

The invention discloses an ultrasonic vibration and welding wire feed system composite welding method and a device thereof which are provided with a stable welding process, high quality of welding seams, controllable welding pool grain growth phenomenon after welding, and high welding quality in normal welding surroundings. The objective is achieved by following steps: transmitting cavitation effect and vibration effect to the welding pool during the welding wire and welding pool contacting process by broadcasting the ultrasonic in the welding wire feed system. The melt drop size at the terminal of the welding wire is controlled effectively by ultrasonic action during welding process, transition from melt drop to welding pool is more stable, and welding seam quality is further improved. Since ultrasonic is applied in the welding feed system during welding process, welding wire melt drop transition condition is affected, energy distribution status during welding process is improved, thereby refinement and homogenization degree of the joint, and mechanical property such as intensity are further enhanced.

The invention discloses an electromagnetic excited TIG arc melting-brazing hybrid welding method and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of a welding arc, and the assistant effect on the melting bath of the liquid-state brazing filler metal for arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

The invention discloses a laser projection system comprising a laser light source which emits laser beams of at least one color. The transmission light path of the laser beams includes a light homogenizing part which is used for receiving and homogenizing the laser beams; a light valve which is used for receiving the laser beams homogenized by the light homogenizing part and modulating the laser beams; a diffuse scattering phase plate which is arranged at the light incident surface side of the light homogenizing part and can increase the divergence angle of the beams; and a moving diffuser which is arranged at the light emergent surface side of the light homogenizing part and can greatly enhance the generation number of random phases, wherein the position of the moving diffuser is the object plane position of the light valve and the human eye integration effect is performed on the generated random phases so that the speckle effect of the projection frame can be weakened or eliminated to the greatest extent, and thus the speckle elimination effect and the display quality of the projection frame can be greatly enhanced.

The invention discloses a laser projection system, comprising a laser light source which is used for emitting laser beams of at least one color; a light homogenization component which is used for receiving and homogenizing the laser beams; a light valve which is used for receiving the laser beams homogenized by the light homogenization component and modulating the laser beams; a vibrating reflection-type phase plate which is arranged on a light incident surface side of the light homogenization component; and a motion diffuser which is arranged on a light emergent surface side of the light homogenization component. A position at which the motion diffuser is located is an object plane position of the light valve. The number of produced random phases can be greatly increased, according to the random phases, through integral action of human eyes, the speckle effect of a projection image can be reduced or eliminated to the greatest extent, and the speckle eliminating effect and the display quality of the projection image can be greatly improved.

The invention discloses a method for batch preparation of graphene quantum dots. The method is characterized by comprising the following steps: using graphite powder as a raw material; quickly obtaining large-batch unoxidized graphene quantum dots by liquid nitrogen impregnation ultralow temperature pretreatment and ultrasonic chemical stripping. According to the method disclosed by the invention, a liquid nitrogen impregnation ultralow temperature pretreatment technology is introduced and is combined with conventional ultrasonic processing, so that large-batch preparation of the graphene quantum dots is realized; according to the method, the condition that the graphene quantum dots are oxidized can be effectively avoided, and the activities such as conductivity of the graphene quantum dots is ensured to the maximum extent; in addition, by using the method, large-batch preparation of high-concentration graphene quantum dots can be realized; the method has the advantages of simple process, convenience in operation and low preparation cost.

The invention discloses a stirring device. The stirring device comprises a box body with an opening in the upper end, a stirring shaft and a stirring paddle, wherein the stirring shaft is connected with the stirring paddle, the stirring shaft comprises a first hollow cavity, and a water injection port is formed in the cavity wall of the first hollow cavity; the stirring paddle comprises a second hollow cavity, the second hollow cavity is communicated with the first hollow cavity, and a plurality of water outlet holes are formed in the cavity wall of the second hollow cavity. The stirring device disclosed by the invention can greatly improve the stirring uniformity.

The invention relates to a NaNbO3 phase containing Na2O-K2O-Nb2O5-SiO2 low dielectric loss energy storage glass ceramic material, the microcrystal glass material is prepared by mixing a glass phase and a crystal phase, fusing, cooling and molding, annealing, and conducting crystallization heat treatment; wherein the glass phase accounts for 20% according to mole percent, and the balance is the crystal phase; the crystal phase is prepared by heating and fusing Na2CO3, K2CO3 and Nb2O5 at the molar ratio of x:(1-x):1, wherein x is more than or equal to 0.7 and less than or equal to 1. The dielectric loss of the prepared potassium-sodium niobate based energy storage microcrystal glass material is low; the added Na2CO3 not only has an effect on regulating the composition of the crystal phase ofa potassium-sodium niobate system, but also has a certain effect on promoting the crystallization process, the NaNbO3 phase favorable for the high energy storage density is formed, and the high energy storage density glass ceramic material is finally obtained.

The invention discloses a method and a device for performing electric magnetization resistance welding-braze welding compounding on dissimilar materials. In the process of performing arc welding-braze welding on the dissimilar metal material, a brazed liquid solder molten pool is subjected to the reinforced booster action of electromagnetic stirring and electric magnetization by using the characteristic that a magnet exciting coil generates an external applied alternating magnetic field in a welding area to control a welding arc so as to promote ordered flow of the liquid solder, and rupture of membranes, wetting, spreading and diffusion of the liquid solder on the surface of the metal material with a higher melting point, promote the liquid solder and a base metal which is molten by the metal material with a lower melting point to be mixed fully, improve uniformity of compositions of a soldered seam, reduce the weld defects, optimize the compositions and the performance of the soldered seam, and improve the soldered joint; and the device has the advantages of simple structure, flexible application, lower cost, good effect, and easy implementation.

The invention discloses a complex nitride and boride synergetic enhancement self-protection bead weld flux-cored wire. A mild-carbon steel strip is adopted as skin, a flux core is prepared from, by mass, 6%-45% of high carbon ferro-chrome, 3%-10% of TiN, 3%-10% of BN, 3%-10% of B4C, 3%-10% of TiB2, 3%-10% of ZrB2, 1%-3% of graphite, 0.5%-1% of 60-mesh cellulose powder, 0.5%-1% of 200-mesh cellulose powder, 1%-3% of 60-mesh aluminum magnesium alloy, 1%-3% of 200-mesh aluminum magnesium alloy, 2%-5% of 60-mesh silicomanganese, 2%-5% of 200-mesh silicomanganese and the balance iron powder, and flux core powder accounts for 50% to 54% of the total weight of the wire. According to the complex nitride and boride synergetic enhancement self-protection bead weld flux-cored wire, flux core components different in grain size are added, so that the good welding process performance is guaranteed; the flux core components and other alloy powder are reasonably matched, so that complex nitride and boride are dispersed through the wire in the welding process, the advantages of being high and even in hardness, good in wear resistance and the like are achieved, no slag basically exists on the surface of a weld bead, and slag removal is not needed during multilayer welding.

The invention discloses a zirconium-containing copper silver titanium solder alloy. The zirconium-containing copper silver titanium solder alloy comprises the following components by mass percent: 10-45% of Ag, 1-4% of Ti, 0.5-5% of Zr and Cu for the rest. A vacuum melting and argon shield casting mode is adopted, silver and copper are molten at first and then titanium and zirconium are added. The zirconium-containing copper silver titanium solder alloy can be used for directly soldering copper alloys, iron steel, ceramics and diamonds. The zirconium-containing copper silver titanium solder alloy has the advantages as follows: the cost is low; a connector is high in mechanical strength, has smooth surface, is stable in quality and is good in uniformity after the copper alloys are soldered by the zirconium-containing copper silver titanium solder alloy; and the joint clearances can be fully filled up. The zirconium-containing copper silver titanium solder alloy can replace the conventional copper silver titanium solder and is suitable for large-scale industrial application.

The invention discloses a glazing device for tile production equipment. The glazing device for tile production equipment comprises a spray gun, wherein the spray gun is provided with a nozzle; the nozzle comprises a first body (1), a second body (2), a connecting element (3), a fluid channel (4), a mixing oscillation cavity (5), an outlet part (6), a spiral rotor (7), a gas channel, wherein the fluid channel, the mixing oscillation cavity and the outlet part are sequentially arranged in the fluid flow direction, the glazing device is characterized in that the mixing oscillation cavity (5) is internally provided with the spiral rotor (7), the spiral rotor comprises spiral blades (71) and a rotating shaft, the spiral blades are arranged on the periphery of the rotating shaft, the two ends ofthe rotating shaft are connected with guide frames (10) through bearings (72), the two guide frames are positioned on the first body and the second body respectively. Through the design of the spiralrotor and air inlet holes, the glaze liquid/the liquid is atomized into smaller atomized spray in the mixed oscillation cavity, the atomization refinement degree is high, the atomization is uniform and stable, the glaze spraying yield is improved, and the raw material utilization rate is improved.

The invention relates to a method for regulating and controlling the homogenization degree of a polyacrylonitrile preoxidized fiber. The method comprises the steps of dipping a polyacrylonitrile fiber into xylene at the room temperature, carrying out oscillation for 5-15 minutes in an ultrasonic oscillation instrument, removing an oil agent from the surface of the PAN fiber, carrying out dipping modification on the polyacrylonitrile fiber by virtue of a 0.5%-4% boric acid solution for 0.5 second to 6 minutes, heating the boric acid-modified polyacrylonitrile fiber in air from the room temperature to 260-340 DEG C at a heating speed of 5 -9 DEG/min, and carrying out pre-oxidation for 10-30 minutes. The method has the advantages that the homogenization degree of the PAN preoxidized fiber can be regulated and controlled and the strength of carbon fibers can be increased.

The invention discloses a high-strength and high-plasticity hollow aluminum profile and a preparation method thereof, and belongs to the field of aluminum profile preparation. The high-strength and high-plasticity hollow aluminum profile comprises the following raw materials of, in percentage by weight (wt%), 2.0-4.0 of Mg, 2.0-4.0 of Cu, 0.4-0.8 of Si, 0.4-1.0 of Gu, 0.8-1.0 of As, 0.2-0.6 of Ti,0.4-1.0 of Mn, 1.0-3.0 of Fe, 0.4-0.6 of Cr, 0.4-0.6 of Zn, 0.6-0.8 of Li, and the balance aluminum and inevitable impurities. By controlling the content of elements in aluminum alloy components, strengthening phases such as Al2Cu, Al2CuMg, Mg2Si and MgZn2 are formed in an aluminum alloy, the strengthening phases act synergistically, so that the effects of deoxidizing and refining grains are achieved, the obvious strengthening effect on the aluminum profile is achieved, the cracking sensitivity of a material is effectively reduced, the mechanical properties such as plasticity, toughness and fatigue resistance of the aluminum profile and the good machining performance are improved, and the performance requirement of the aluminum profile for alternate transportation can be met.

The invention relates to a system device for adding rare earth into a continuous casting tundish and an adding method, belonging to the field of ferrous metallurgy. In the invention, a powder spraying tube is arranged between a tundish and a powder spraying pot, one end of the powder spraying tube is connected with a powder spraying pot, the other end is arranged at the slit of a slit-type air brick arranged at the lower part of the tundish, and argon is adopted to spray rare earth powder to the slit of the air brick by the powder spraying tube and then enters the tundish. In the invention, high-pressure powder airflow is utilized to intensively stir molten steel, thus shortening alloying time, greatly improving dynamical condition of metallurgy reaction, promoting homogenized degree of rare earth elements in steel, improving yield of alloy, having strong reproducibility and accurate sprayed elements, and controlling the components of smelt steel within a narrow range. The invention also solves the problem of environmental pollution, and has the advantages of saved investment, portable equipment, easy operation and the like.

The invention relates to a KNN-based (sodium potassium niobate-based) energy storage microcrystalline glass material with ultralow dielectric loss and a preparation method. The microcrystalline glass material is prepared from a glass phase and a crystal phase through mixing, fusing, cooling and molding, annealing, carrying out crystallization heat treatment, wherein according to mol percent, the glass phase accounts for 20 percent to 50 percent and the balance is the crystal phase; the crystal phase is composed of K2CO3, Na2CO3, Nb2O5 and BaCO3 at a mol ratio of (3-x) to (3-x) to 6 to 2x and x is more than 0 and less than or equal to 2.5. The KNN-based energy storage microcrystalline glass material prepared by the preparation method has extremely low dielectric loss; BaO is introduced, has the effect of adjusting the composition of the crystal phase of a sodium potassium niobate system and also has a certain promotion effect on a devitrification process and devitrification is accelerated by rare-earth metal ions; the BaO can also generate a pinning effect, and adverse impacts, caused by interface polarization, on breakdown and worsening are weakened; finally, the microcrystalline glass material with a high dielectric constant is obtained.

The invention provides a powder feeding device capable of realizing powder gradient change and for laser cladding. The powder feeding device comprises a top end cover, a powder mixing bin, a powder storage bin, a powder storage bin base and a fixing seat, wherein the top end cover is provided with a plurality of powder feeding holes and arranged at one end of the powder mixing bin, and a rotatingpowder mixing device is arranged in the powder mixing bin. The rotating powder mixing device is connected to a motor through the top end cover, and a first powder feeding portion and a first powder discharging hole are formed in the powder storage bin base. A first powder disk arranged on the fixing seat is connected to a second powder disk through a hollow tube, a second powder feeding hole formed in the first powder disk is connected to the first powder feeding portion, and a second powder discharging hole formed in the second powder disk is connected with the first powder discharging hole.The first powder feeding portion communicates with the bottom of the powder storage bin, a first screen is arranged at the bottom of the first powder feeding portion, and a micro oscillator is arranged on the first screen. The powder feeding device capable of realizing powder gradient change and for laser cladding can solves the problems that in existing powder feeding, clogging of a powder feeding pipe and a laser cladding head is prone to occurring, the powder utilization rate is low, and real-time gradient change of various kinds of powders cannot be realized in the cladding process.