759 results about "Bimetal" patented technology

The invention discloses a composite electrode material for removing uranium through photoelectrocatalysis and a preparation method and application of the composite electrode material, and belongs to the technical field of catalytic materials and wastewater treatment.The preparation method of the composite electrode material comprises the following steps that a ZIF-8 material, copper salt and ferric salt are mixed, and a first metal composite material is prepared; reacting the first metal composite material with a KOH solution to prepare a second metal composite material; carrying out carbonization treatment on the second metal composite material, and then carrying out acid treatment by using acid to obtain a bimetallic atom catalytic material; the preparation method comprises the following steps: dispersing a bimetallic atom catalytic material and a g-C3N4 material in a mixed solution containing phytic acid and a Nafion solution to obtain catalyst ink; and coating the catalyst ink on a substrate, and carrying out illumination drying to obtain the composite electrode material. According to the composite electrode material, under the synergistic effect of the bimetallic single atomic cluster catalyst and g-C3N4, respective advantages are fully exerted, and efficient deposition removal of uranium is achieved.

The invention relates to a method for preparing bimetallic core-shell structure composite powder based on an acoustic resonance technology, and belongs to the technical field of powder metallurgy. Adding the micron matrix metal powder and the nano coating layer metal powder into a mixing tank, replacing air in the mixing tank with protective gas or active gas, and setting the pressure of the gas in the tank and the temperature of the tank body; and then three-section acoustic resonance coating powder preparation is carried out, and the bimetal core-shell structure composite powder is obtained. According to the method, different metal powder is driven by acoustic resonance to do violent disordered movement, the outer layer of micron metal powder is evenly and tightly coated with nano metal powder under the combined action of electrostatic force and other physical force, and finally the core-shell structure bimetal coated powder is obtained. The method is simple, the preparation efficiency is high, the applicability is wide, the thickness adjustable range of the coating layer of the obtained bimetallic coated powder is wide, the obtained bimetallic coated powder is uniform and compact, the powder particle morphology can be effectively maintained, and pollution of other elements is avoided.

The present invention belongs to the technical field of thermal relay production, and specifically discloses an assembly device for thermal relays. The assembly device for thermal relays provided by the present invention comprises a thermal element transplanting device that realizes automatic assembly of the thermal element in the bottom shell, a clamping jaw assembly that clamps the first side and the second side of the bimetallic material, and a first positioning portion on the clamping jaw assembly that positions the first end of the bracket, thereby simultaneously clamping and positioning the bimetallic material and the bracket, and a second positioning portion that positions the conductive rod, thereby simultaneously clamping and positioning the bimetallic material and the conductive rod, thereby ensuring that the thermal element can be stably transported and installed; a thermal element position detection device that detects the position of the thermal element after the bottom shell is installed, and after the detection assembly abuts against the thermal element in the bottom shell, the position detection assembly can obtain the position of the detection assembly in the first direction, thereby determining whether the installation position of the thermal element in the bottom shell meets the installation requirements, with high detection accuracy and consistent detection of the product.

The invention relates to the technical field of dissimilar metal connection, in particular to a copper-steel bimetal piece with a complex inner runner and a preparation method thereof.The preparation method comprises the steps that a cooling runner is preprocessed through a copper alloy blank, and a primary copper alloy workpiece is obtained; the primary copper alloy part is cleaned, and a secondary copper alloy part is obtained; the stainless steel blank is subjected to surface treatment and cleaning, and a stainless steel workpiece is obtained; the secondary copper alloy workpiece and the stainless steel workpiece are assembled and then are arranged in a sheath; the sheath is heated and vacuumized and then is sealed and welded; carrying out hot isostatic pressing treatment on the sealed and welded sheath to obtain an intermediate part; and the steel ladle sleeve outside the middle part is removed, and the copper-steel bimetal part is obtained. According to the method, the phenomena of generation of brittle intermetallic compounds on the interface and grain coarsening are avoided, the connection strength is remarkably improved, interface metallurgical bonding and high-precision shape control of a cooling runner are synchronously completed in a single process, and the geometric precision of the copper-steel bimetal part is guaranteed.

According to the production method of the hot-rolled copper-steel double-metal composite plate, copper is oxygen-free copper, and Cu is larger than or equal to 99.95%; the steel is low-alloy high-strength steel; the key process steps of the copper-steel composite plate comprise assembling, heating, rolling, cooling and finishing. By controlling the rolling temperature, the pass reduction rate, the cooling speed and other processes, the plate shape of the copper-steel rolled composite plate is obviously improved, the stability of the bonding surface is greatly improved, and therefore industrial production and application of the copper-steel bimetal rolled composite plate are achieved.

The invention discloses a production process of a novel copper-based alloy bimetallic synthesis material, and relates to the field of alloy materials.The production process comprises the steps that a copper-nickel alloy is selected as a base material, a titanium alloy is selected as a functional layer, and stress distribution of a bonding layer is designed and optimized through gradient component distribution; preparing a copper-nickel alloy liquid by utilizing vacuum induction melting, supporting and fixing a core rod through three points, and controlling temperature and flow velocity for pouring to form co-growth crystals; the surface of the base material is cleaned through a sand blasting process, a Cu-Ti nano coating is coated through a PVD technology, and a nanoscale convex-concave structure is formed; building a mathematical model of a temperature field and a component diffusion field, and optimizing and combining area temperature distribution and diffusion behaviors through simulation analysis; through gradient temperature control annealing treatment, residual stress is eliminated, and diffusion is promoted; the bonding performance is evaluated by combining shear strength and microhardness tests; and dividing the production process based on the modular design. The method can be widely applied to the industrial fields with high-temperature, high-strength and corrosion-resistant requirements.

The invention belongs to the technical field of coating material preparation, and particularly relates to a copper-titanium co-doped amorphous carbon coating and a high-throughput preparation method. The invention firstly provides a high-throughput preparation method, the method does not need to prepare a plurality of target materials with different metal contents, a plurality of deposition samples can be obtained only by preparing a plurality of matrixes once through ingenious arrangement of matrix sample positions and specific quality control index requirements, and then test screening is carried out in combination with the quality control index requirements. And the bimetallic-doped amorphous carbon coating with the optimal performance can be rapidly screened out with relatively low process cost for practical application.

The invention discloses a preparation method of a vibration and noise reduction bimetal composite pipe, relates to the field of metal pipe processing, and aims to solve the problem of poor vibration and noise reduction performance of a traditional composite pipe. The preparation method comprises the steps that a composite pipe blank is provided and sequentially comprises a titanium alloy pipe and a stainless steel pipe from outside to inside, the titanium alloy pipe and the stainless steel pipe are fixed through a base, and an annular columnar filling cavity is defined by the titanium alloy pipe, the stainless steel pipe and the base; the filling cavity is filled with metal particle materials, the metal particle materials are compacted through a pressing block, and the open end of the filling cavity is sealed and welded through a cover plate; hot rolling is conducted on the composite pipe blank, and a first composite pipe blank sequentially comprising a titanium alloy layer, a porous metal layer and a stainless steel layer from outside to inside is obtained; and cutting off the pipe section of the base and the cover plate to obtain the composite pipe. And the porous metal layer formed by the metal particle material has good energy absorption performance and excellent sound insulation and heat insulation performance, so that the prepared bimetal composite pipe finally achieves the purposes of vibration and noise reduction.

The invention discloses a bimetal composite pipe end welding device and method, and relates to the technical field of welding, the bimetal composite pipe end welding device and method comprise a base, a fixing plate and a welding mechanism, the fixing plate is arranged on the top of the base, the welding mechanism is arranged on the inner side of the fixing plate, and the welding mechanism is arranged on the inner side of the fixing plate. The welding mechanism comprises a first motor, cutting machines, a spring telescopic rod, a second welding machine mechanism and a protective barrel plug, the first motor is used for driving the cutting machines to conduct position adjustment according to the size of an actually-welded pipeline, and after the multiple cutting machines cut the outer layer of a section of double-layer pipeline, the argon arc welding machine mechanism on the mounting ring is driven to surround the outer side of the pipeline; the outer layer welding is completed according to the inner layer welding principle, overall welding of the bimetal composite pipe is achieved, the problems of weld cracks and air holes caused by traditional bimetal composite pipe welding are avoided, the welding quality is improved, the production cost is reduced, and the working time is shortened.

The present invention provides a detection device for the bonding strength of bimetallic sheets, which comprises: an intermediate ball die holder, a specimen clamping assembly, and a cutting tool. The intermediate ball die holder includes an upper template and a lower template arranged horizontally. The upper template and the lower template are movably connected through a movable connecting member, and the upper template can move up and down relatively. A positioning and fixing block is arranged on the upper end surface of the lower template, and the specimen clamping assembly is installed on the positioning and fixing block. The specimen clamping assembly is used for clamping the specimen. A cutting tool fixing block is arranged on the lower end surface of the upper template, and the cutting tool is installed on the cutting tool fixing block. The cutting tool is used for shearing the specimen. Taking the bimetallic material of steel back and copper alloy as an example, this detection device is applicable to detecting the bonding strength of bimetallic materials with a steel back layer thickness ≥ 2 mm and a copper alloy layer thickness ≥ 0.5 mm. The operation is simple, the influence of other external interference factors is reduced, the repeatability of the test results is good, and the measured data is more accurate and reliable.

The utility model relates to the technical field of saw blade repairing, and discloses a bimetallic strip saw blade tooth blade repairing device which comprises a fixing frame, a transverse electric sliding rail is fixedly arranged at the top of the fixing frame, a transverse electric sliding block is arranged in the transverse electric sliding rail, and an air cylinder is fixedly arranged at the bottom of the transverse electric sliding block. An oil storage tank is fixedly mounted at the tail end of a piston rod of the air cylinder, a grinding rod is fixedly arranged at the bottom of the oil storage tank, an oil separation plate is fixedly arranged in the oil storage tank, an oil discharge pipe is fixedly arranged at the bottom of the oil separation plate, an electromagnetic valve is arranged on the pipe wall of the oil discharge pipe, and an oil discharge port is formed in the bottom of the oil storage tank and located on one side of the grinding rod; a longitudinal electric sliding rail is fixedly arranged at the bottom of the fixing frame. According to the double-metal band saw blade repairing device, the double-metal band saw blade can be automatically polished, the repairing efficiency is improved, meanwhile, cutting oil can be automatically added, the tooth edge of the saw blade is effectively prevented from being abraded, and the repairing quality is improved.

The invention belongs to the technical field of bimetal part manufacturing, and particularly relates to a method for preparing aluminum-magnesium bimetal through a pulse electromagnetic composite field and a bimetal product, and the method comprises the following steps that a casting foam model is prepared according to the preset form of a workpiece, and a solid aluminum inlay and the casting foam model are assembled to form a composite model. And embedding the composite model into a sand box. During pouring, a pulsed magnetic field and a pulsed electric field are applied to the composite model in a vacuum environment. And cooling to obtain the aluminum-magnesium bimetal product. The invention further discloses the aluminum-magnesium bimetallic product prepared through the method. The method is suitable for manufacturing aluminum-magnesium bimetal castings with complex shapes, the process is simple, the bimetal interface is easy to control, the bimetal bonding performance is good, the alloy strengthening effect is good, grain refinement is effectively achieved, interface defects are overcome, and the method is suitable for producing various related parts in the fields of automobiles, spaceflight and the like.

A conduit coupling assembly for joining together two metal conduits includes a first fitting having a first end opposite a second end, wherein the first end is threadably attached to the conduit, and a first washer attached to the second end of the first fitting, wherein the first washer is non-metallic. The coupling may further include a second fitting in abutment with the first washer, a nut surrounding the first fitting and the second fitting, and a second washer disposed between the nut and the second fitting, wherein the second washer is non-metallic.

The invention relates to the field of gas sensing, and discloses a two-dimensional Cu-TCPP modified bimetallic MOF composite material and a preparation method and application thereof, a gas sensor and a preparation method and application thereof, the two-dimensional Cu-TCPP modified bimetallic MOF composite material comprises a Zn / Co-MOF material, and the surface of the Zn / Co-MOF material is modified with a Cu-TCPP nanosheet. According to the two-dimensional Cu-TCPP modified bimetallic MOF composite material, the characteristics of large surface area and high electron transmission efficiency of a two-dimensional material and the characteristics of porosity, high specific surface area, chemical tunability and the like of an MOF material are fused, and the catalytic activity of the material is enhanced through introduction of Cu-TCPP, so that the detection sensitivity of target gas is improved; resistance change detection of gas molecules is realized, and the gas molecules are converted into electric signals to be output and used for monitoring characteristic gas of dissolved gas in transformer oil.

The invention relates to the technical field of photocatalysis, in particular to a Ni / Ga bimetal doped g-C3N4 nanotube composite material as well as a preparation method and application thereof. The Ni / Ga bimetal doped g-C3N4 nanotube composite material with the nitrogen vacancy is formed by doping Ni and Ga bimetals into the g-C3N4 nanotube and calcining the g-C3N4 nanotube in the air atmosphere to introduce the nitrogen vacancy. Nitrogen vacancies and double metal doping synergistically improve the efficiency of photocatalytic hydrogen production, because the Ni / Ga double metal doped g-C3N4 nanotube composite material with the nitrogen vacancies has a wider visible light absorption range, a lower carrier recombination rate, a higher electron transfer rate and higher stability, the composite material further has higher hydrogen production efficiency.

The invention discloses a bimetal composite plate with an X90-grade composite layer made of nickel base alloy Inconel625 and a manufacturing method of the bimetal composite plate. The bimetal composite plate comprises the following chemical components in percentage by weight: base material components including C, Si, Mn, Cr, Ni, Mo, Cu, Nb, V, less than or equal to 0.05% of Al, Ti and the balance of Fe and inevitable impurity elements; the composite material comprises the following components: less than or equal to 0.08% of C, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 20.0-23.0% of Cr, 8.0-10.0% of Mo, 3.15-4.15% of Nb, less than or equal to 5.0% of Fe, less than or equal to 0.05% of Al, less than or equal to 0.05% of Ti and the balance of Ni and inevitable impurity elements. According to the invention, the components are comprehensively optimized, and proper rolling and tempering processes are matched to obtain the bimetal composite plate with yield strength not lower than X90 and excellent corrosion resistance for the oil and gas transmission line pipe.

The invention discloses an inorganic normal-temperature rapid-hardening coal-rock mass reinforcing and filling material, and relates to the technical field of mine reinforcement. The material comprises a liquid A and a liquid B, the liquid A is prepared from cement, fly ash, magnetic nano silicon dioxide, citric acid and a layered bimetal oxide-sodium hexametaphosphate compound; and the liquid B comprises water glass, superfine limestone and water. During use, the liquid A and the liquid B are mixed according to the volume ratio of 1: 1 and injected into a target area, and a 1.5 Tesla magnetic field is applied at the initial stage of grouting until the grout is initially set. Through the synergistic effect of the compound protection dispersing agent, the magnetic particles and an external magnetic field, the technical problems that an existing material is unstable in performance due to temperature change, nanoparticles are prone to agglomeration, and magnetic response is attenuated in an alkaline environment are effectively solved; the technical effects of rapid solidification, high strength and excellent durability in high-temperature, low-temperature and complex mine environments are achieved.

The invention discloses a preparation method of an iron-manganese bimetallic catalytic material by using copper slag. The preparation method comprises two steps of pretreating the copper slag and preparing the iron-manganese bimetallic catalytic material. The iron-manganese bimetallic catalytic material prepared by the method belongs to a porous material, is rich in pores and large in specific surface area, is rich in Fe < 3 + >, Mn < 3 + >, Mn < 4 + > and other active sites on the surface, has the advantages of high catalytic activity, good stability and environmental friendliness, and realizes reduction and high-value utilization of the copper slag. In addition, the prepared iron-manganese bimetallic catalytic material can be used for catalyzing persulfate to form an advanced oxidation system, and is suitable for degradation treatment of organic wastewater such as printing and dyeing wastewater, pharmaceutical wastewater, food wastewater and raffinate.

The invention provides a casting method of a copper-steel double-metal cylinder body, and belongs to the technical field of pump body part machining, the casting method comprises the following steps: pre-treating a steel substrate and a copper alloy, and then heating and preserving heat together; cooling is conducted, cooling is conducted in four stages, the blowing direction of the first stage cooling, the blowing direction of the third stage cooling and the blowing direction of the fourth stage cooling are all from bottom to top, the blowing direction of the second stage cooling is from top to bottom, and solidification of the molten copper is completed after the third stage cooling; and after cooling is completed, tempering treatment is conducted, and the copper-steel double-alloy cylinder body is obtained. In the cylinder body casting process, the heated cylinder body is subjected to multi-stage cooling, the gas blowing directions of different cooling stages are controlled, rapid solidification of molten copper can be achieved, the situation that the molten copper fluctuates is avoided, the solidification defect is effectively controlled, and a compact copper layer is obtained; and through the final-stage cooling and tempering process control, the matrix structure of the steel matrix is regulated and controlled, tempered sorbite is formed, and the mechanical property of the cylinder body is improved.

The invention provides an MXene-derived bimetallic composite material as well as a preparation method and application thereof, and relates to the technical field of catalysts. In the MXene-derived bimetallic composite material provided by the invention, a 3D ordered pore structure provides a channel for organic pollutant molecules and H2O2 to transfer mass to a catalytic active center in the material; tiO2 and the MCuFe-MOF generate photo-induced electrons, a TiO2 / Ti3C2Tx Schottky junction and a MCuFe-MOF / Ti3C2Tx Schottky junction promote separation and transfer of charges, and Fe < 3 + > / Fe < 2 + > circulation is accelerated; the synergistic effect of a redox pair between iron and copper in the MCuFe-MOF is shown as a copper-iron bimetal oxide or a copper-iron bimetal organic framework and the like, interface electron transfer can be accelerated, rapid reduction of Fe < 3 + > and Cu < 2 + > is promoted, the Fenton reaction efficiency is improved, and the photo-Fenton catalytic activity is excellent.

The invention discloses preparation of a Tm-Cu-In < 2 > O < 3 > composite material, a gas sensor based on the Tm-Cu-In < 2 > O < 3 > composite material, a preparation method and application, and belongs to the technical field of gas sensor materials. Thulium chloride, copper sulfate, indium salt and an organic solvent are used as raw materials, In2O3 is doped with double metal elements Cu and Tm, a composite gas sensitive material is prepared, and a gas sensor based on the composite gas sensitive material is obtained. Compared with other In2O3-based H2S sensors, the gas sensor prepared by the invention has high sensitivity, high selectivity and good stability to H2S, and still has relatively high response in a high-humidity H2S environment, so that the gas sensor has excellent gas sensitivity to H2S gas in the environment. The sensor is simple in production process, low in energy consumption in the production process, low in cost and suitable for industrial batch production.

The invention discloses a double-metal gradient diffusion layer modified high-nickel ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: filtering and uniformly dispersing high-nickel ternary positive electrode material powder; introducing inert gas into the atomic layer deposition system, and raising the temperature to a target temperature; respectively preheating the metal precursors A and B to proper temperatures; the preparation method comprises the following steps: sequentially introducing a metal precursor A, precursor water, a metal precursor B and precursor water into a reaction chamber, alternately depositing according to a pulse-reaction-purging sequence, and repeatedly circulating the process to obtain the bimetallic oxide coated high-nickel ternary positive electrode material, and post-annealing treatment. According to the bimetal gradient diffusion layer modified high-nickel ternary positive electrode material prepared by the preparation method disclosed by the invention, the lithium storage performance of the high-nickel ternary material is greatly improved, excellent cycling stability and rate capability are obtained, the coating layer is accurate and controllable, the preparation process is simple, meanwhile, large-batch production can be realized, and relatively high application value is achieved.

The invention discloses pipeline steel for an acid environment, a bimetal metallurgy composite pipe and a preparation method of the bimetal metallurgy composite pipe, and relates to the technical field of manufacturing of pipes for oil and gas gathering and transportation. The pipeline steel for the acid environment comprises the following chemical components in percentage by mass: 0.07%-0.11% of C, 0.25%-0.37% of Si, 1.15%-1.35% of Mn, less than or equal to 0.012% of P, less than or equal to 0.003% of S, 0.01%-0.03% of Nb, 0.015%-0.03% of Al, 0.01%-0.025% of Ca, less than or equal to 0.005% of N, less than or equal to 0.002% of O, less than or equal to 0.00015% of H, less than or equal to 0.007% of O + H + N and the balance of Fe and inevitable impurities. The pipeline steel for the acid environment has enough strength, high toughness and good hydrogen sulfide stress corrosion resistance and hydrogen induced cracking resistance, and can meet the requirements of gathering and transportation of corrosive oil and gas.

The invention relates to the technical field of jaw crusher jaw plate machining, in particular to a bimetallic jaw crusher wear-resistant jaw plate surfacing method based on field data analysis, which comprises the following steps: S10, collecting field jaw plate operation data in real time, including wear depth distribution delta, working temperature T and impact frequency f; s20, a dynamic analysis model is constructed according to on-site jaw plate operation data, so that a comprehensive wear parameter Ke is calculated; s30, comparing the comprehensive wear parameter Ke with a set threshold value Kt; when the Ke is greater than the Kt, generating a three-dimensional surfacing thickness map, and dynamically adjusting the components of the welding wire; and S40, an automatic surfacing welding machine is adopted for executing layered surfacing welding work. According to real-time analysis of field data, the surfacing method for the jaw plate is adjusted in time, and the quality of the jaw plate is improved.

The invention discloses a preparation process of a dual-material tappet with both wear resistance and toughness, and relates to the technical field of engine tappet manufacturing, the preparation process comprises the steps of matrix pretreatment, gradient heating, infiltration compounding, diffusion heat preservation, subsection cooling and finish machining, and a wear-resistant alloy material comprises the following chemical components in percentage by weight: 3.2-3.6% of C, 0.4-0.6% of Ni, 2.4-2.5% of Si, 0.9-1.3% of Cr, 0.6-0.9% of Mn and the balance of Fe and inevitable impurities. Mo is equal to 0.4%-0.65%, and Slt is equal to 0.1%, Plt; 0.1%, with the balance being Fe and inevitable impurities. Compared with the prior art, the method has the advantages that the performance can be flexibly matched according to different engine requirements; the comprehensive performance of the working face is remarkably improved by adopting an infiltration composite process; the strength and the toughness of the matrix are improved; the double-metal bonding strength is consistent; the cost of the infiltration composite process is lower than that of brazing; the matrix in the semi-molten state and the wear-resistant material form metallurgical bonding, and the bonding strength is higher; the combined steel and the gradient cooling process jointly improve the impact resistance.

The invention belongs to the technical field of metallurgy, and particularly relates to a method for preparing an aluminum-iron composite material based on microtexture.The method comprises the steps that S1, an iron matrix is obtained and pretreated; s2, the iron matrix is placed in deionized water; s3, preparing a microstructure on the surface of the iron matrix; and S4, the iron matrix is adopted for liquid-solid composite casting to prepare the aluminum-iron composite material. On one hand, the micro-texture prepared in deionized water is more uniform, the roughness is reduced compared with that of the micro-texture prepared in air, and the wettability of an aluminum alloy melt when the aluminum alloy melt makes contact with an iron matrix is well improved; and on the other hand, when the micro-texture is prepared in the deionized water, the deionized water can effectively enable slag generated when the surface of the iron matrix is subjected to laser etching not to be deposited in the micro-texture any more, so that the interior of the micro-texture is more uniform and smoother, the filling rate of an aluminum alloy melt is effectively increased, and the problem of interface cracking after aluminum-iron bimetal solid-liquid compounding is solved.

The invention belongs to the technical field of EBSD sample preparation of heterogeneous materials, and particularly relates to an EBSD sample preparation method of an Al7075 / Al6061 bimetal composite cast ingot. According to the method, mechanical grinding and polishing and argon ion polishing are combined for EBSD sample preparation, during mechanical grinding and polishing, aluminum oxide polishing paste is selected for rough polishing, aluminum oxide or chromium oxide polishing paste is selected for fine polishing, and finally cerium oxide polishing paste is selected for fine polishing, so that crystal lattices with complete and distortionless sample surface layers are obtained as far as possible, and the defects such as trailing are reduced to the maximum extent; the optimal surface characteristics are provided for subsequent argon ion polishing, and meanwhile, the calibration rate of an Al7075 / Al6061 bimetal composite cast ingot EBSD sample prepared through the method is not lower than 90% in combination with the optimal argon ion polishing process parameters.

The invention provides a preparation method of a composite pipe, the composite pipe and a processing device of the composite pipe, relates to the technical field of composite pipes, and aims to solve the problem that in the prior art, a bimetal composite pipe only has compressive strength and cannot give consideration to vibration reduction and sound absorption performance, so that the application range of the bimetal composite pipe is small. The preparation method of the composite pipe comprises the steps that the metal pipe, the hollow balls and the metal base material are provided; the melting point of the metal tube and the melting point of the hollow ball are both larger than that of the metal base material. Melting the metal substrate to obtain a liquid metal substrate; the liquid metal base material and the hollow ball are injected into the rotating metal pipe through centrifugal casting, so that the liquid metal base material and the hollow ball are located on the inner wall of the metal pipe, and a composite structure with the hollow ball is obtained; and the composite structure with the hollow balls is cooled, so that the liquid metal base material is solidified, and the composite pipe with the hollow balls is obtained.

The invention relates to a hot rolling composite process for improving the strength of a low-alloy high-strength steel / nickel-based alloy bimetal composite plate, and belongs to the technical field of materials. Firstly, a welded assembly is subjected to heat preservation for 2-4 h at the temperature of 1250 DEG C, large-deformation rolling is adopted at the temperature higher than 1000 DEG C after discharging, the rolling reduction of each pass is larger than or equal to 20%, and in the stage, a composite plate is rolled to be 70% or above of the target thickness; and when the temperature is 900-1000 DEG C, rolling to a target thickness by adopting small deformation, and then cooling to room temperature in air. Effective metallurgical compounding of the bimetallic material can be realized by using the hot rolling compounding process, the obtained bimetallic compound interface is flat and straight and has no metallurgical defects such as pores and cracks, the interface of a sample subjected to three-point bending is still well compounded, and cracks are not generated macroscopically and microcosmically. According to the hot rolling composite technology, the back stress strengthening effect of a composite interface can be fully exerted, meanwhile, the proportion of dynamic recrystallization grains in the nickel-based alloy is reduced, and the strength of a nickel-based alloy layer is improved.

The invention discloses a dust-free environment purification method for biological pharmacy. Comprising the following steps: constructing three layers of metal filter screens, realizing particle interception through a conical micro-column array, an Al2O3 / TiO2 composite ceramic layer and a diamond-like carbon film, fixing lysozyme by adopting a crystal face regulated ZIF-8 crystal, and realizing dual inactivation of microorganisms by combining dielectric barrier discharge of a spiral plasma channel. The electrostatic adsorption HEPA filter paper adopts a BaTiO3-graphene quantum dot composite electret substrate, and a TiO2 / graphene heterojunction catalytic layer is decomposed by a Pt-Co bimetallic nanocluster and a photocatalysis-plasma-ozone-thermocatalysis quadruple oxidation system; and 0.1 mu m organic aerosol triggers graded reverse pulse cleaning based on differential pressure integration and a particle concentration threshold value, and the honeycomb flow guide structure drives a shutter and a gradient density sintering metal flow guide plate through piezoelectric ceramics to maintain laminar flow uniformity. According to the scheme, the limitation of a traditional technology is broken through, the purification efficiency of 0.1 micron particles is improved, and a high-stability solution is provided for a biopharmaceutical clean room.