19 results about "Beryllium Powder" patented technology

The invention provides a beryllium-titanium alloy injection molding feed and a preparation method thereof, and relates to the technical field of metal injection molding. The beryllium-titanium alloy injection molding feed is prepared by mixing composite beryllium-titanium alloy powder and a catalytic degreasing binder according to the mass ratio of (70-80): (20-30), the composite beryllium-titanium alloy powder is composed of, by mass, 40% of spherical beryllium powder, 30% of spherical titanium powder and 30% of irregular beryllium powder. The D90 of the spherical beryllium powder and the spherical titanium powder is 60-80 [mu] m, and the D90 of the irregular beryllium powder is 6-10 [mu] m; the catalytic degreasing binder is prepared from the following components in parts by mass: 76 to 84 parts of polyformaldehyde, 7 to 9 parts of high-density polyethylene, 5 to 7 parts of ethylene-vinyl acetate copolymer, 3 to 5 parts of paraffin, 0.1 to 1.5 parts of stearic acid, 0.1 to 1.5 parts of polyethylene glycol and 0.1 to 1 part of BASF antioxidant. The spherical powder and the irregular powder are reasonably proportioned, so that the powder stacking density and sintering compactness are improved, and meanwhile, the flowability is considered.

The invention discloses a method for in-situ self-generation of an aluminum oxide reinforced beryllium-aluminum alloy material and the beryllium-aluminum alloy material, and belongs to the technical field of alloy material reinforcement. The method comprises the following steps: S1, mixing beryllium powder and aluminum powder with high oxygen content in a mechanical mixer for 10-36 hours to obtain beryllium-aluminum mixed powder; s2, cold isostatic pressing treatment is conducted on the beryllium-aluminum mixed powder, and a beryllium-aluminum powder blank is obtained; s3, degassing the beryllium aluminum powder blank in a vacuum state; and S4, the degassed beryllium aluminum powder blank is subjected to hot isostatic pressing treatment. On the premise that the mechanical property of the beryllium-aluminum alloy material is guaranteed, the reliability and stability of the beryllium-aluminum alloy material are improved.

This invention discloses a beryllium-titanium alloy microsphere for neutron multiplication materials and its preparation method, belonging to the field of beryllium-titanium alloy technology. The preparation method includes: Step S1, ball milling and mixing beryllium powder and titanium powder at a predetermined mass ratio, followed by a first dry particle composite process to obtain beryllium-titanium spherical powder. Step S2, adding a polyvinyl alcohol binder to the beryllium-titanium spherical powder, followed by a second dry particle composite process to obtain beryllium-titanium granulated powder. Step S3, filling the beryllium-titanium granulated powder into multiple flexible spherical molds, then placing the multiple flexible spherical molds into a sleeve and performing cold isostatic pressing to obtain beryllium-titanium powder blank microspheres. Step S4, degreasing the beryllium-titanium powder blank microspheres under inert gas protection. Step S5, sintering the degreased beryllium-titanium powder blank microspheres to obtain beryllium-titanium alloy microspheres with a diameter of not less than 5 mm and a relative density ≥ 98%.

This invention proposes a molding device and a billet consolidation method for ultrafine beryllium powder, belonging to the field of beryllium powder billet consolidation technology. This invention employs composite silicone end plugs and cold isostatic pressing (COP) technology to prepare beryllium billets suitable for beryllium copper master alloys. It overcomes the technical problems of uneven powder loading, easy tearing of the casing, and sealing failure in existing COP technology when processing ultrafine beryllium powder. It provides a dedicated molding device and consolidation method capable of stably preparing high-density, defect-free ultrafine beryllium powder billets.

The invention discloses a zirconium boride reinforced beryllium-based composite material and a preparation method thereof, and belongs to the technical field of beryllium-based alloy treatment. The method comprises the steps that S1, zirconium boride powder and beryllium powder are mixed and then subjected to ball milling, and uniform composite powder is obtained; and S2, the uniform composite powder is subjected to cold isostatic pressing, primary sintering, secondary sintering and natural cooling in sequence, and the zirconium boride reinforced beryllium-based composite material is obtained. The zirconium boride reinforced beryllium-based composite material is large in relative density, good in room-temperature plastic deformation capacity, large in room-temperature tensile strength and high-temperature (gt; the strength retention rate at 500 DEG C is high, and the cost is low.

This invention discloses a method for laser additive manufacturing of beryllium-aluminum alloy and the obtained beryllium-aluminum alloy, comprising the following steps: A) Weighing pure beryllium powder with a purity of not less than 97 wt% and pure aluminum powder with a purity of not less than 99.5%, and mixing them in a beryllium-aluminum mass ratio of 60-65:35-40 to obtain a uniformly mixed beryllium-aluminum powder; B) Using the beryllium-aluminum powder as the powder feeding material, 3D printing the beryllium-aluminum powder into shape using a laser additive manufacturing process. The beryllium-aluminum alloy prepared by this invention exhibits a dense metallurgical structure, a hardness of 75-85 HV, and a tensile strength of 160-180 MPa, possessing high strength and toughness. The improved laser additive manufacturing process has advantages such as high material utilization, low production cost, and short manufacturing cycle, overcoming the shortcomings of the original laser additive manufacturing process.

The invention provides a preparation method of beryllium-titanium pre-alloyed powder, which comprises the following steps: preparing raw materials, mixing metal powder and a dispersing agent, adding weighed beryllium powder, titanium powder and the dispersing agent into a ball-milling tank, adding zirconium oxide balls as a ball-milling medium, pre-ball-milling for 20-40 minutes, and adjusting to enable the beryllium powder and titanium hydride powder to generate mechanical alloying reaction, thereby obtaining the beryllium-titanium pre-alloyed powder. The beryllium-titanium pre-alloy powder obtained after ball milling is formed, staged heating heat treatment is conducted, the beryllium-titanium alloy powder obtained after medium-temperature heat treatment is screened, a disc jet mill is started, the beryllium-titanium alloy powder is shaped, and the shape of the beryllium-titanium alloy powder tends to be nearly spherical; pre-alloyed powder is obtained; the beryllium-titanium pre-alloyed powder with high fluidity is prepared through mechanical alloying and medium-temperature heat treatment in combination with disc jet mill shaping, has good fluidity and component uniformity, and meets application of various forming processes such as powder metallurgy, injection molding and additive manufacturing.

The invention discloses a method for preparing a beryllium cast ingot by recycling beryllium cloth bag powder waste, and belongs to the technical field of material recycling, the method comprises the following steps: sequentially carrying out acid washing suction filtration, water washing suction filtration and absolute ethyl alcohol cleaning suction filtration on the beryllium cloth bag powder waste with the beryllium content greater than 90% to obtain wet beryllium cloth bag powder with the beryllium content greater than 96%; pressing the wet beryllium cloth bag powder into a cloth bag powder cake, and performing vacuum drying; after the vacuum-dried cloth bag pressed powder and beryllium beads are placed in a beryllium oxide crucible of a vacuum melting furnace, vacuum melting is conducted under the protection of argon, and beryllium cast ingots are obtained; and naturally cooling the beryllium cast ingot to room temperature, and washing with water. The pure beryllium cast ingot prepared through the method is low in impurity element content and high in purity, the raw material use requirement of pure beryllium powder metallurgy can be met, the amount of cloth bag powder waste capable of being recycled at a time is large, beryllium bead raw materials are saved, and the current situation that beryllium raw material supply is short is relieved.

This invention relates to the field of powder metallurgy, and particularly to a method and production equipment for preparing high-performance beryllium metal powder by atomization powdering, comprising the following steps: S1, feeding: placing the raw material into a melting crucible in the melting zone; S2, melting: heating and melting the raw material into a melt under vacuum conditions; S3, atomization and spheroidization: the melt flows downward through a guide pipe into the atomization zone, where a high-pressure inert gas is ejected from an annular nozzle to break the melt into fine droplets; the droplets fly within the atomization chamber, are cooled at the top, and then enter the lower part of the atomization chamber, falling along a spiral trajectory along a spiral plate set at the bottom of the atomization chamber, where the droplets shrink, spheroidize, and solidify; S4, classification and collection: the solidified powder enters the classification zone for particle size classification and collection, with coarse powder flowing back to the melting zone to mix and remelt with the raw material, and fine powder collected as the product. Through the coordinated operation of each step, high sphericity, narrow particle size distribution, low oxygen content, and batch stability of the beryllium metal powder are achieved.

The invention belongs to the technical field of beryllium aluminum alloy manufacturing, and relates to a preparation method of a silicon-added high beryllium aluminum alloy, which comprises the following steps: (S1) adding 10-20 [mu] m beryllium powder into a fluidized bed vapor deposition reactor, introducing a mixed gas of silane and hydrogen, and heating for silane deposition to obtain Si-coated Be core-shell powder; (S2) adding aluminum powder, magnesium powder, germanium powder and the Si-coated Be core-shell powder into a ball mill in an inert atmosphere, adding a liquid paraffin medium, and carrying out ball milling to obtain a precursor; and (S3) the precursor is sequentially subjected to cold isostatic pressing, hot isostatic pressing treatment, acid pickling treatment, solution treatment, quenching treatment and aging treatment, and then the high-beryllium aluminum alloy is obtained. Silicon is introduced into a bulk phase in a vapor phase silicon deposition mode, so that the doped silicon element is uniformly dispersed and anchored in the alloy bulk phase, the interface bonding strength of the alloy is improved, and meanwhile, the wear resistance of the alloy is also improved.

The application discloses a neutron detection structure with flat energy response, which comprises a cylindrical uranium-235 fission chamber detector, a cylindrical moderator body with a cylindrical cavity for accommodating the cylindrical uranium-235 fission chamber detector, wherein the thickness of the moderator body in the radial direction from the inner cylindrical surface of the cylindrical cavity to the outer cylindrical surface of the moderator body is L, and the thickness of the moderator body in the axial direction from the inner end plane of the cylindrical cavity to the outer end plane of the moderator body is also L; wherein the moderator body is made of graphite material, and the thickness L is in the range of 22cm to 25cm; or the moderator body is made of beryllium powder and deionized water with a volume ratio of 4:1, and a curing agent is added for casting forming, so that the beryllium powder is uniformly fixed in the matrix, and the thickness L is in the range of 7cm to 8cm. The application adopts a symmetrical cylindrical geometric configuration, eliminates the directionality of the traditional long counter, and realizes excellent energy response flatness through the selection and matching of the moderator material and the key thickness parameter.

This invention discloses a beryllium oxide-coated intermediate package and its preparation method, relating to the field of intermediate package coating preparation technology. The preparation method includes: step S1, preparing a first mixture with phosphoric acid and deionized water, then adding beryllium oxide powder and an antifoaming agent to obtain a beryllium oxide dispersion; step S2, immersing the sandblasted intermediate package in the beryllium oxide dispersion for 2-3 coating treatments; and step S3, calcining the coated intermediate package to obtain an intermediate package with a beryllium oxide coating of 1.5-2.0 mm thickness. This invention first uses phosphoric acid as a binder to prepare the beryllium oxide dispersion, and then obtains a beryllium oxide-coated intermediate package by repeatedly coating the inner wall of the inexpensive intermediate package with the beryllium oxide dispersion followed by calcination. This method can resist the thermal shock of molten beryllium metal and ensure the purity of the beryllium powder.

This invention discloses a fully equiaxed crystal additive manufacturing method for beryllium aluminum alloy, comprising the following steps: Step 1: Preparation of pre-alloyed aluminum powder, in which pure aluminum is mixed with alloying element particles and spherical pre-alloyed aluminum powder is prepared by inert gas atomization; Step 2: Preparation of mixed powder, in which the pre-alloyed aluminum powder obtained in Step 1 is mixed with beryllium powder to obtain beryllium aluminum alloy mixed powder; Step 3: Laser additive manufacturing, in which the mixed powder is used as raw material and laser additive manufacturing is performed under a protective atmosphere to obtain a beryllium aluminum alloy with a fully equiaxed crystal structure. The preparation method of this invention eliminates the adverse effects on performance caused by columnar crystal epitaxial growth, significantly improving the comprehensive mechanical properties of the beryllium aluminum alloy, specifically its yield strength, tensile strength, and elongation.

This invention relates to the field of powder metallurgy technology, specifically to a method for preparing beryllium-titanium alloy microspheres using a hot pressing process. Step 1: Raw material briquetting: Beryllium powder and titanium powder are weighed according to a mass ratio of (6-7):(3-4), mixed in a mixer, and briquetting. Step 2: Block processing: The briquetting blocks are removed, crushed in a crusher, and then ball-milled to obtain pre-treated powder. The pre-treated powder is then loaded into a mold. Step 3: Hot pressing sintering: The mold is placed in a hot press furnace, and a vacuum is drawn until the vacuum degree is less than 6.0 × 10⁻⁶. ‑3 Pa, heating at a rate of 2.5-4.5℃ / min to 1000-1100℃ and holding for 2-3 hours, cooling to 600-650℃, pressurizing to 30-50 tons and holding for 2-3 hours, then allowing natural cooling to room temperature; Step 4, demolding and processing: demolding is performed using a demolding machine, and the demolded blank is then machined to obtain beryllium titanium alloy microspheres with a relative density ≥98%. This invention improves the tap density and mixing uniformity of beryllium titanium mixed powder, and solves the problems of low powder filling rate and component segregation.

The application provides a high-thermal-conductivity and high-elastic-modulus beryllium-aluminum alloy and a preparation method thereof, and belongs to the technical field of alloy manufacturing. The preparation method comprises the following steps: S1, beryllium powder, aluminum powder and graphene derivatives are loaded into a three-dimensional mixer for intermittent mixing to obtain mixed powder; S3, the beryllium-aluminum alloy blank is placed into a vacuum furnace for high-temperature vacuum primary degassing treatment; S4, after the high-temperature vacuum primary degassing treatment, the beryllium-aluminum alloy blank is shaped and then placed into a steel ladle for secondary degassing and vacuum welding sealing; and S5, after the vacuum welding sealing, the beryllium-aluminum alloy blank is placed into a hot isostatic pressing device for hot isostatic pressing treatment, and then the ladle is removed by using nitric acid to obtain the beryllium-aluminum alloy. The beryllium-aluminum alloy has low alloy density, good mechanical properties, high elastic modulus and high thermal conductivity.

The present application relates to powder metallurgy equipment technical field, especially to a kind of special atomization powdering system and powdering method for preparing metal beryllium powder.The atomization powdering system includes powdering main body mechanism and auxiliary mechanism, and the powdering main body mechanism includes the melting system, atomization system and powder collecting system connected in sequence from top to bottom;The auxiliary mechanism includes vacuum system, gas supply system and cooling system.The atomization system includes atomization chamber and atomization nozzle, and the atomization nozzle is arranged in the central top of atomization chamber, and the inside of atomization chamber is provided with ultrasonic standing wave unit along the direction of droplet flight, and the inner wall of atomization chamber is provided with cooling assembly;Vacuum system is communicated with melting system;Gas supply system is communicated with melting system and atomization nozzle.The metal beryllium powder prepared by the system optimization of high-temperature metal beryllium melt flow, protective gas flow adjustment and powder cooling has the comprehensive advantages of high sphericity, high purity and low oxygen content.

The invention discloses a high-strength beryllium-aluminum-magnesium alloy and a preparation method thereof, and belongs to the technical field of beryllium alloy materials. The preparation method comprises the steps that aluminum blocks and magnesium blocks are mixed and then sequentially subjected to vacuum melting and atomization, and aluminum magnesium alloy powder is obtained; the beryllium powder and the aluminum magnesium alloy powder are intermittently and mechanically mixed according to the intermittent time of 1.5-2 h, and mixed powder is obtained; putting the mixed powder into a rubber sheath in a vibrating manner, continuously vibrating for 25-30 minutes, and sequentially performing sealing treatment and cold isostatic pressing treatment on the rubber sheath to obtain a beryllium-aluminum-magnesium blank; and the beryllium-aluminum-magnesium blank is sequentially subjected to vacuum sintering, degassing and hot isostatic pressing, and the beryllium-aluminum-magnesium alloy is obtained. The beryllium-aluminum-magnesium alloy is good in mechanical property and high in load deformation resistance, and application of the beryllium-aluminum-magnesium alloy in different fields is met.

The invention relates to the technical field of metal processing, in particular to a jet mill for preparing metal beryllium powder, which comprises a flat jet mill, a crushing cavity, a motor, a vibration assembly, a vibration plate, a traction assembly and a traction wheel, a crushing cavity is formed in the flat jet mill; a feeding hole, an air inlet and a discharging hole are formed in the crushing cavity, and a spraying ring is mounted in the crushing cavity; a motor is fixedly installed at the bottom end of the smashing cavity, a vibration assembly is arranged above the motor, a vibration plate is arranged above the vibration assembly, and the motor drives the vibration plate to vertically vibrate in a reciprocating mode through the vibration assembly. A traction assembly is arranged above the vibration assembly, a traction wheel is arranged on one side of the traction assembly, and the vibration assembly drives the traction wheel to rotate in one direction through the traction assembly to pull airflow. Efficient conveying of the metal beryllium powder is achieved through reciprocating motion, and the phenomenon that the metal beryllium powder is accumulated in the smashing cavity, and consequently the wall bonding phenomenon is caused is avoided; and the normal work of the flat jet mill is influenced.

The invention discloses a high-beryllium aluminum alloy material and a preparation method thereof, and belongs to the technical field of alloy material preparation. Beryllium powder, nickel particles, germanium powder and silicon particles are mixed and then subjected to vacuum melting, and beryllium alloy melt is obtained; carrying out gas atomization treatment on the beryllium alloy melt to obtain beryllium alloy powder; beryllium alloy powder, aluminum powder and the modified alloy refiner are mixed and subjected to ball milling to obtain mixed metal powder, and the mixed metal powder is pressed at high pressure to obtain a high-beryllium aluminum alloy blank; and sintering the high-beryllium aluminum alloy blank at high temperature to obtain the high-beryllium aluminum alloy material. Beryllium powder, nickel particles, germanium powder and silicon particles are subjected to vacuum melting and gas atomization treatment to obtain beryllium alloy powder, and the beryllium alloy powder, aluminum powder and a modified alloy refiner are mixed and then subjected to high-pressure pressing and high-temperature sintering treatment in sequence to obtain the high-beryllium aluminum alloy material with good mechanical properties.