39 results about "Beryllium-Aluminum Alloy" patented technology

The invention discloses a method for analyzing and detecting alloying elements in a beryllium-aluminum alloy. The method comprises the following steps: weighing a beryllium-aluminum alloy sample to be detected and 20% sodium hydroxide solution in the mass ratio of (0.1 to 5): 100, and putting into a polytetrafluoroethylene plastic beaker; dissolving at a low temperature; oxidizing by adding 30% hydrogen peroxide in a small amount drop by drop, and decomposing excessive hydrogen peroxide by heating after oxidizing; cooling to obtain a mixed solution; weighing the mixed solution, 50% hydrochloric acid and 50% nitric acid in the volume ratio of (5 to 10): (30 to 50): (10 to 20); acidizing and heating until the solution is absolutely clear; cooling and diluting the solution to the required volume with water; shaking the solution up to obtain the beryllium-aluminum alloy sample solution to be detected; then, plotting standard working curves; and finally detecting the samples. The method for analyzing and detecting alloying elements in a beryllium-aluminum alloy in the invention solves the problems of the determination of silver with higher content in the beryllium-aluminum alloy material and the influence thereof on other elements to be detected in the material in the analysis and detection using plasma emission spectra.

The invention relates to the field of beryllium aluminum alloy, and particularly discloses beryllium aluminum alloy and a preparation method thereof. The beryllium aluminum alloy comprises a berylliumaluminum alloy matrix and a colored anode oxide film positioned on the surface of the beryllium aluminum alloy matrix. The method comprises the following steps: S1, performing alkaline cleaning on aberyllium aluminum alloy precursor to be treated; S2, performing acid cleaning; S3, performing acid attack; S4, performing anodic oxidation; S5, performing hot water rinsing; S6, dyeing; S7, performing sealing, so as to obtain the beryllium aluminum alloy. The obtained beryllium aluminum alloy is higher in corrosion resistance, has good extinction function, and is more applicable to optical structure elements.

The invention relates to a preparation method of beryllium aluminum alloy, which aims to reduce the difficulty of preparation and improve production efficiency. The preparation method of the beryllium aluminum alloy in the present invention comprises three key steps of raw material mixing, cold isostatic pressing and hot isostatic pressing liquid phase sintering. Compared with other preparation methods of beryllium-aluminum alloys, the method of the present invention selects aluminum alloys containing alloy elements, which improves the wettability of liquid aluminum and solid beryllium during the preparation process of beryllium-aluminum alloys by liquid phase sintering, and has the advantages of low sintering temperature and short sintering time. The advantages of short length and high interface bonding strength can greatly improve the mechanical properties of beryllium aluminum alloy.

The invention discloses a beryllium-aluminum alloy sheet and a manufacturing method thereof. The manufacturing method comprises the sequential steps of manufacturing beryllium-aluminum alloy cast ingots, performing hot-pressing preforming on the beryllium-aluminum alloy cast ingots and performing hot-rolling forming on beryllium-aluminum alloy ingot blanks so that the beryllium-aluminum alloy sheet can be obtained. In the step of manufacturing the beryllium-aluminum alloy cast ingots, near-liquidus electromagnetic casting is adopted for manufacturing the beryllium-aluminum alloy cast ingots. The manufacturing method is a composite processing method combining near-liquidus electromagnetic casting, solid-state hot-pressing preforming and precision rolling. Near-liquidus electromagnetic casting is adopted in the step of manufacturing the beryllium-aluminum alloy cast ingots, formation of small and uniform non-dendritic structures is facilitated, and refining of alloy as-cast structures of beryllium-aluminum alloy is facilitated. Alloy dendritic structures of the cast ingots are further fragmented through hot-pressing performing, and the plastic deformation capacity of the alloy is improved. Finally, the sheet of the required thickness is obtained through a precision rolling method, and both the mechanical property and the composition of the produced beryllium-aluminum alloy sheet meet the requirements.

The invention provides a welding method of cast beryllium-aluminum alloy. The welding method of the cast beryllium-aluminum alloy comprises the following steps that (1) the surface of a cast beryllium-aluminum alloy material is dipped in absolute ethyl alcohol, oil dirt attached to the surface of the cast beryllium-aluminum alloy material is cleaned, and the cast beryllium-aluminum alloy materialis cleaned up with deionized water; (2) preparation is conducted before welding, wherein beryllium-aluminum welding wires are prepared by means of wire cutting, and welding of sample sheets and welding of sample rods are conducted; (3) the welding initial current is 5-10 A, the arc extinguishing current is 10-20A, the welding current is 100-150A, the welding speed is 0.5-2 cm/s, and the argon flowof a spray nozzle is 5-20 L/min; (4), heat treatment is conducted on welding samples, and the temperature is 550-600 DEG C and kept for 4-6 h; (5) the sample rod completing heat treatment is machinedto be a mechanical sample. By the adoption of the welding method of the cast beryllium-aluminum alloy, the combination degree between a weld joint and the matrix is good, macroscopic cracks are avoided, and the mechanical performance index of the welded material is 0.9-1 time that of the welded matrix material.

The invention discloses a beryllium-aluminum-zirconium-series multi-element alloy and a preparation method thereof which aim at solving the problems that at present, a method that a beryllium-aluminumalloy is prepared by adopting powder hot isostatic pressing is complicated in technology and very high in cost and greatly limits application of the beryllium-aluminum alloy. The beryllium-aluminum-zirconium-series multi-element alloy is prepared and formed by adopting the following raw materials of, by weight, 54-80% of metal beryllium, 17-45% of metal aluminum, 0.2-2% of metal zirconium and 0.1-1.0% of add element. In the beryllium-aluminum-zirconium-series multi-element alloy and the preparation method thereof, based on an existing beryllium-aluminum alloy, the metal zirconium and other alloying elements are added, a beryllium-aluminum alloy base material is prepared firstly, then a pre-alloying beryllium-aluminum-zirconium-series multi-element alloy is prepared through a vacuum induction smelting method, and then the beryllium-aluminum-zirconium-series multi-element alloy is obtained through subsequent remelting. According to the beryllium-aluminum-zirconium-series multi-element alloy and the preparation method thereof, by conducting multi-element alloying of zirconium and other elements on the beryllium-aluminum alloy, an equiaxed crystal alloy with the refined structure andthe uniform size can be obtained, structure defects and composition segregation are reduced, and alloy plasticity is improved, so that alloy mechanical properties are greatly improved, and the excellent comprehensive performance is achieved.

The invention relates to the field of beryllium aluminum alloys and particularly discloses a beryllium aluminum alloy and a preparation method thereof. The beryllium aluminum alloy comprises a beryllium aluminum alloy matrix and a nickel-phosphorous alloy layer on the surface of the beryllium aluminum alloy matrix. The preparation method of the beryllium aluminum alloy comprises the steps of performing treatments on a beryllium aluminum alloy precursor including, S1, alkali washing, S2, acid pickling, S3, acid etching, S4, first zinc immersion, S5, zinc removal, S6, second zinc immersion, S7,alkaline nickel preplating and S8, acid chemical nickel-phosphorous alloy plating. The preparation method of the beryllium aluminum alloy can well plate nickel-phosphorous alloy on the surface of theberyllium aluminum alloy. The plated layer on the surface of the beryllium aluminum alloy is glossy, uniform, continuous in surface and free from peeling, falling-off, local roughness and the like.

The invention discloses a preparation method for an ultrafine-grained beryllium-aluminum alloy and a product thereof, belongs to the field of non-ferrous metal alloy preparation, and aims at solving the problems that the microstructure of a beryllium-aluminum alloy prepared through a casting method presently is basically presented as thick columnar dendrites, and a beryllium-aluminum alloy with uniform and fine crystalline grains and good performance is difficultly obtained. According to the preparation method disclosed by the invention, mixing and dissolving for alloy components are realizedthrough pre-alloying, rapid cooling for a melt is realized under the condition of a low superheat degree, and finally the novel ultrafine-grained beryllium-aluminum alloy with fine and compact beryllium crystalline grains, uniformly-sized microstructure and equiaxed grains is obtained, so that the mechanical property and the structure uniformity of the beryllium-aluminum alloy are greatly improvedcompared with an alloy in a slowly-cooled state, and meanwhile, segregation is greatly eliminated and the formation of pin holes is suppressed. On the basis of improvement for the preparation method,the beryllium-aluminum alloy disclosed by the invention is more excellent in mechanical property and microstructure, so that more application needs of the special beryllium-aluminum alloy material can be met.

The invention discloses a novel method for anodic oxidation of a beryllium aluminum alloy material, and belongs to the field of alloy materials. The method is composed of the following steps that (1),the surface of the beryllium aluminum alloy is treated in a machining manner so as to improve the surface smoothness, and then is repeatedly washed with deionized water to be clean; (2), the beryllium aluminum alloy material subjected to the surface treatment is soaked with an organic solution for 5-10 minutes to remove oil; (3), a chemical oil removal process is carried out on the beryllium aluminum alloy material, and the duration time is 10-15 seconds; (4), chemical polishing is carried out on the surface of the beryllium aluminum alloy by utilizing an acidic solution, wherein the polishing time is 10-15 seconds; (5), a proper cathode and anode area ratio is determined, a proper rack is selected to fix an anode, a proper interelectrode distance is selected to fix the positions of the two poles, and then an anodic oxidation process is started; and (6), hole sealing is carried out by adopting a potassium dichromate solution after the oxidation process is finished. According to the method, anodic oxidation is carried out on the surface of the beryllium aluminum alloy, so that the corrosion tendency of the beryllium aluminum alloy is prevented and reduced, and the corrosion resistance and the surface performance of the beryllium aluminum alloy are improved.

The invention relates to the field of beryllium aluminum alloys and particularly discloses a beryllium aluminum alloy and a preparing method thereof. The beryllium aluminum alloy comprises a berylliumaluminum alloy base body and a chemical oxide film located on the surface of the beryllium aluminum alloy base body. The method includes the steps that firstly, a beryllium aluminum alloy precursor needing to be treated is subjected to alkaline washing; secondly, acid pickling is conducted; thirdly, acid etaching is conducted; fourthly, chemical oxidizing is conducted; and fifthly, the berylliumaluminum alloy is obtained after hot washing. The chemical oxidization time ranges from 5 min to 7 min, and the temperature ranges from 25 DEG C to 30 DEG C; oxidation liquid used in chemical oxidization is chromic anhydride and sodium fluoride, and the prepared beryllium aluminum alloy has high corrosion-resisting performance and electric conduction performance.

The invention discloses a method for improving ductility of casting a beryllium aluminum alloy. The method comprises the following steps that (1) polishing is carried out on the surface of a casting,and when impurities in the surface is removed, the casting is put into a hot isostatic pressing furnace; (2) an initial pressure is stamped into the furnace, wherein temperature is heated to 500 DEG Cwith a heating rate which is less than or equal to 5 DEG C/min and kept for 30 minutes; (3) the temperature is continuously heated to 590 +/-10 DEG C at the same heating rate, a hot isostatic pressing treatment pressure is enabled to be 110-130 MPa, and the treatment time is 150-180 minutes; and (4) after the treatment is completed and the temperature is cooled to 200 DEG C with the heating ratewhich is less than 5 DEG C/min, and power-off and the cooling are carried out. According to the method, a medium used for the hot isostatic pressing is argon, the performance of a beryllium-aluminum alloy phase interface is improved after the casting is treated through the hot isostatic pressing, the strength and the ductility rate of the alloy are improved, certain casting defects in a casting product after the treatment are improved, and the compactness of the alloy is further improved; and the strength of the alloy treated by the hot isostatic pressing is increased by about 10%, and the ductility rate is improved by 60% or above.

Provided is a method for quantitative determination of beryllium content in a beryllium-aluminum alloy by using a molecular imprinting method. The method is characterized in that beryllium-pyrrole/graphite imprinting electrodes are used as working electrodes, calomel electrodes are used as reference electrodes, and platinum filament electrodes are used as three-electrode systems of counter electrodes. Under the condition that potential of hydrogen (pH) is equal to 1-4, temperature ranges from 20 to 80 DEG C, and scanning speed ranges from 30 to 600mv/s, coefficient of variation (CV) curves in sulfuric acid beryllium standard solution of different densities are measured so as to obtain linear response relation, determination limits and the like. Compared with other electrodes, current intensity is improved by one magnitude, and measuring sensitivity is greatly improved.

The invention discloses a release agent used for precision casting of a beryllium-aluminum alloy and a preparation method of the release agent. The release agent comprises, by weight, 70-80% of deionized water, 4.7-6.0% of sodium silicate, 10.0-13.0% of aluminum oxide, 2.0-3.5% of silicon oxide, 0.8-1.3% of sodium dihydrogen phosphate, 0.4-0.7% of disodium hydrogen phosphate, 1.5-2.5% of calcium chloride, 0.8-1.2% of graphene oxide and 1.0-1.8% of sodium tetraborate. The release agent has the advantages of simple ingredients and preparation, scientific component ratio and non-toxic harmless raw materials and can be stored for a long time for later use. The release agent can effectively achieve isolation between the beryllium-aluminum alloy and a die shell wall for protection, ensures fastand easy release from a die, does not affect the surface quality of an alloy part and a die shell and is conducive to repeated use of the die shell as well as the precision casting process of the beryllium-aluminum alloy, thereby greatly improving the working efficiency and reducing the alloy melting-casting cost.

The invention relates to a beryllium aluminum alloy discharging plasma sintering preparation method, which comprises the following steps of mixing beryllium powder and aluminum alloy power according to the design ingredient proportion; charging the mixed materials into a soft mold; making the materials into a cold pressing blank through cold isopressing; charging the cold pressing mold into a graphite mold; then, putting the graphite mold into an SPS furnace body; performing vacuum pumping and pressurization; performing discharging plasma sintering. Compared with other preparation methods, themethod has the advantages that the work procedure is simple; the sintering temperature is low; the sintering time is short; the tissue is fine and uniform; the mechanical performance is good. The beryllium aluminum alloy powder metallurgy process is simplified; the production efficiency is improved; in addition, the method is hopeful to be applied to the field of aerospace. The beryllium aluminumalloy can select a polynary aluminum alloy system; the beryllium aluminum alloy meeting different service condition requirements can be prepared according to the characteristics of the aluminum alloyin different series.

The invention discloses a preparation method of a beryllium oxide/aluminum oxide double-phase particle composite reinforced modification layer on the surface of a beryllium-aluminum alloy. A mode of pre-sintering ternary premixed composite powder of micron metal aluminum powder, nano aluminum oxide powder and nano beryllium oxide powder on the surface of the beryllium-aluminum alloy is adopted, and electron beam remelting and subsequent heat treatment are combined to obtain an alloy surface modification layer with high hardness and gradient distribution of strengthening phase particles. By adopting the technical route, adverse effects caused by the use of metal beryllium powder and cracking failure of the surface modification layer can be avoided, metallurgical bonding between the modification layer and an alloy matrix is realized, and the structural stability of the surface modification layer is ensured. The method is simple, convenient and feasible in process route, can effectively meet the requirement for the thermophysical property of a surface coating when the cast beryllium-aluminum alloy is used as an electronic encapsulating material, and has a good practical engineering application prospect.

The invention discloses a special composite slag removing agent for beryllium aluminum alloy refining, a preparation method and a slag removing method. The slag removing agent comprises the followingcomponents in parts by weight: 30-50 parts of sodium tetraborate, 2-8 parts of AlB12 intermediate alloy, 2-5 parts of hexachloroethane, 7-10 parts of sodium hexafluorisilicate, 2-6 parts of sodium fluoroaluminate, 1-5 parts of sodium fluoride, 5-12 parts of potassium chloride, 6-13 parts of beryllium chloride, 2-5 parts of lithium chloride, 2-5 parts of sodium carbonate, and 1-3 parts of clay. Theslag removing agent achieves excellent high-temperature stability and reliability under the vacuum condition, and is excellent in adhesiveness after melting, high in spreadability, quick in slag collection, easy incrustation of slag skin and excellent in slag removing and refining effect. Through the synergistic effect of all the components, oxides in melts, magnesium-contained impurities and hydrogen achieve excellent slag removing and absorbing effects; and meanwhile, the slag skin can effectively cover the surfaces of the melts, so that the temperature loss can be effectively reduced, thesplashing of the melts is inhibited, and new melting slag and secondary oxidation are prevented.

The invention provides a multilayer piezoelectric substrate provided with a beryllium aluminum alloy film, comprising a piezoelectric substrate layer and a conductive layer which are sequentially arranged, wherein the conductive layer is a beryllium aluminum alloy film. According to the multilayer piezoelectric substrate in the invention, beryllium aluminum alloy is adopted as a sputtering film, beryllium is a hexagonal crystal system and is easy to combine with the piezoelectric substrate layer with the same lattice structure, aluminum in the alloy can serve as a sound transmission material,thereby improving the sound transmission efficiency, so that the problem of poor bonding due to the fact that the lattice structures are different between the aluminum film and the piezoelectric substrate is solved by utilizing beryllium; moreover, both the alloy film and the aluminum film are metal films, and the alloy film and the aluminum film are combined by means of metal bonding, so that thebonding state is good, and the films are not easy to fall off.