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2023 Vol. , No. 5
Published: 2023-10-20
RESEARCH AND TECHNOLOGY
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One step synthesis of highly ordered L10-FePt nanoparticles induced by Pb
FePt nanoparticles with face centered tetragonal phase (L10) structure have the characteristics of large Magnetocrystalline anisotropy, good biocompatibility and high catalytic activity, and have broad application prospects in the fields of information storage, military, catalysts, permanent magnets and biomedicine. The research shows that the addition of precious metals or transition metal elements such as Au, Ag, Cu can simplify the preparation process, significantly reduce the disorder order transition temperature of L10 FePt nanoparticles, and induce the one-step synthesis of highly ordered L10 FePt nanoparticles. In this paper, we doped the third metal element Pb, and directly synthesized L10 FePt nanoparticles with uniform composition, no agglomeration, high order and good magnetic properties through wet chemical method. The results showed that the ordering degree s and coercivity Hc of L10 FePt nanoparticles increased with the increase of reaction temperature. The best synthesis temperature is 360℃, and L10 FePt nanoparticles with the best magnetic properties can be prepared. At this time, the atomic composition of the nanoparticles is Fe62Pt15Pb23, and the coercivity after pickling is Hc=8622.4 Oe. Therefore, L10 FePt nanoparticles with high order and good dispersion can be directly synthesized by a reasonable synthesis process and the induction of the third element. The one-step synthesis process of Pb elements is expected to achieve the controllable preparation of L10-FePt nanoparticles.
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Effect of Forging Process on Microstructure and Properties of Ti-22Al-25Nb Alloy Large-Sized Bars
Ti-22Al-25Nb alloy of φ400mm large-bar was produced by three-dimensional reversing forging process, the limit deformation of three-dimensional reversing forging is studied；the difference of the microstructure and mechanical properties of the bar produced by different times of three-dimensional reversing forging in the B2+α2+O three phase zone is analyzed. The results show that :the limit deformation of Tab.3 Room temperature tensile properties of Ti-22Al-25Nb alloy bar after three three-dimension reversing forging reversing forging is 50%；when the number of three-dimensional reversing forging reaches 3 after forging in B2+α2+O three phase zone, the Ti-22Al-25Nb alloy of φ400mm large-bar can be prepared with good microstructure uniformity、excellent mechanical properties and flaw detection result.
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Recent Progress of MXene and its Composites in Cathode Materials of Aqueous Zinc-ion Batteries
Aqueous zinc-ion batteries are one of the promising electrochemical energy storage devices. It has the advantages of easy preparation, environmental friendliness, high safety and large specific capacity. Due to the unique structural characteristics and physical/chemical properties, MXene shows the ability to enhance the electrochemical performance of electrodes. It has been considered a potential electrode material for rechargeable batteries due to the excellent conductivity, rich chemical composition, controllable surface chemistry and adjustable layer spacing. In this review, the recent progress of MXene and its composites in cathode materials of aqueous zinc ion batteries is summarized, and the unique advantage of MXene materials for zinc ion storage is discussed. Finally, the challenges and prospects of MXene materials in zinc ion batteries have also been outlined.
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Simulation analysis of temperature field of sintered NdFeB vacuum sintering furnace based on Fluent
Taking the SRVS-50G vacuum sintering furnace as the research object, the temperature field of the sintered NdFeB vacuum sintering furnace was simulated and analyzed based on the Fluent finite element analysis software. The transient temperature distribution of the vacuum sintering furnace under no-load conditions was simulated, and the simulation results were compared with the experimental data, and the difference between the two was found to be within 15%. On this basis, the effects of heating power and heating body width on the temperature distribution characteristics and heating efficiency of the heating system were further studied. The results show that choosing the appropriate heating power and heating body width can properly improve the heating efficiency and the temperature uniformit.
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In situ synthesis of Ni3S2@MoS2 on the Surface of La-Nd-Y-Ni A5B19 hydrogen storage alloy and its electrochemical properties
As the anode material of Ni-MH batteries, the hydrogen storage alloy largely determines the performance of Ni-MH batteries. The corrosion or oxidation layer on its surface not only causes the cycle life of the alloy electrode to be greatly decayed, but also has a great impact on the high-magnification performance, thus limiting the application of NiMH batteries in the fields of high power and extreme environments. Based on the above reasons, researchers prepared the active layer of transition metal sulfide with high electrocatalytic activity as well as good electrical conductivity and strong bonding on the surface of alloy electrode by various methods, which can significantly improve the electrochemical performance of alloy electrode. Based on the research of the group, a new La-Y-Ni annealed alloy La0.25Nd0.2Y0.55Ni16.1Co1.5Mn0.9Al0.9 of type A5B19 was prepared, and Ni3S2@MoS2 was successfully grown in situ on the alloy surface by hydrothermal treatment at different temperatures. The effects of Ni3S2@MoS2 on the phase composition, hydrogen storage properties and electrochemical properties of the alloy were investigated by XRD, SEM/EDS, XPS and electrochemical methods. The results showed that the activation performance of the alloy electrode decreased with the increase of hydrothermal treatment time, and the cycle life and high multiplicity performance improved to different degrees, and the cycle life S100=92% was the highest improvement at 120℃ treatment compared with S100=85.9% at untreated condition, and the high multiplicity performance HRD1800=65.8% at 160℃ treatment (HRD1800=37.3% under untreated condition), which reached the maximum. The in situ growth of Ni3S2/MoS2 on the surface of the hydrogen storage alloy not only improves the corrosion resistance of the alloy surface, but also enhances the high-magnification discharge performance of the alloy electrode. This new cost-effective sulfidation method makes it possible to apply Ni-MH batteries in high power areas and extreme environments.
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Research on Residual Stress of Ceramic Thermal Barrier Coating System during Thermal Spraying
Thermal barrier coatings (TBCs) technology is one of the core technologies to solve the service of aviation engine and gas turbine at high temperature. It can not only hinder thermal fuel gas, but also avoid oxidation, corrosion, erosion of foreign material on the blade caused by damage. Therefore, an in-depth study of the factors of thermal stress in the TBCs preparation is of great significance for the design, preparation and strength evaluation of TBCs, and plays an important role in the safety service of aero-engine and gas turbine. This paper reviews the research progresses in the last five years on the stress problem in the preparation of TBCs thermal spraying, including the influence of preparation technology such as spray parameter, bond coat (BC) temperature and roughness, thermal treatment, laser surface remelting on thermal stress in the point of views of theory, experiments and analysis.
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Analysis and research on preparation of W@Ce(OH)4 core- shell composite powder by electroless plating
In order to determine the use of electroless plating method for the preparation of Ce(OH)4 with W particles as the core and Ce(OH)4 as the shell The feasibility of the core shell structure of W@Ce(OH)4 and the reaction pathway of Ce(OH)4. In this study, NaOH was added dropwise to a mixed aqueous solution of Ce(NO3)3-6H2O and polyethylene glycol containing high-purity tungsten powder. The above feasibility and reaction pathway were analyzed by combining experimental observation, microstructure analysis of powder and sintered body. The results show that the electroless plating method can be successfully prepared W@Ce(OH)4 core-shell structure. When the aqueous solution of NaOH is not dripped, even after 24 hours, there is no sign of reaction in a mixed aqueous solution with a weak acidic pH (about 5.63), and Ce(OH)4 shells cannot be formed. After dropping the NaOH aqueous solution dropwise, signs of reaction gradually appear in the aqueous solution. As the amount of NaOH drops increases, the color of the W particles in the mixed solution changes from the original gray to white and eventually to yellow. Ce(OH)4 shell is formed on the surface of W particles by first reacting Ce3+with OH- to form Ce(OH)3 precipitation, which is then formed by reacting with dissolved oxygen and water.
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Architecture of Material data infrastructure and Its Application
Material data is the basis of digital material R&D, and the construction of material data infrastructure is the key to effectively use material data and accelerate material R&D. At present, there are many data infrastructure materials in the world, and the opening and sharing of data has gradually become an international consensus. In this paper, we analyzed the main challenges and countermeasures faced by the construction of materials data infrastructure, and puts forward the general infrastructure and key technologies of distributed materials data infrastructure. Based on this architecture, we designed the platform deployment at three levels: edge, enterprise and industry, and built some examples of material data infrastructure, demonstrating the functions of the platform and its role in digital R&D of materials.
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Current situation and development trend of automotive chip technology
Through multiple surveys on the application market of automobile chips and the capabilities of chip manufacturers, and through the collection and summary of the national chip incentive policies, combined with the technical characteristics of the four types of automobile chips and the quality characteristics of the car gauge chips, the article summarizes the lack of capabilities of the domestic automobile chip industry chain, as well as the current formation of two- super-multiple-strong competition patterns, including the problems of the car gauge chips in the steady development. Therefore, effective countermeasures and suggestions are also put forward.
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Simulation Analysis of Gas Quenching Cooling Temperature Field and Flow Field of Sintered NdFeB Vacuum Sintering Furnace Based on Fluent
Taking the SRVS-50G vacuum sintering furnace as the research object, based on the Fluent finite element analysis software, the temperature field and flow field of the sintered NdFeB vacuum sintering furnace were simulated and analyzed during the gas quenching and cooling process. This article studies the effects of cooling inlet wind speed and outlet quantity on the cooling uniformity and cooling efficiency of vacuum sintering furnace. The results show that increasing the inlet air speed can improve cooling efficiency, but the cooling uniformity is reduced. The appropriate inlet wind speed should be selected according to the specific product temperature uniformity requirements. In terms of the number of air outlets, the number of air outlets is 4, which is the best in terms of cooling uniformity and cooling efficiency.
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Research on surface waviness of IF steel
Microstructure of IF steel was observed by OM with different annealing temperature and different work roll conditions in hot dip galvanizing(HDG) process, surface morphology was observed by OM and SEM with different work roll process, its Wsa with different annealing temperature and different work roll process were tested. The results show that the annealing temp. have no effect on the surface morphology, work roll roughness have effect on the surface morphology. When the annealing temperature increases, the grain size becomes big. Decrease the annealing temperature above the recrystal temperature, it can avoid the grain to grow up for recrystal grain, and the grain size is small and uniform. When the annealing temp. is 820 ℃, work roll roughness is 1.6?m, Wsa value is more better.
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Frictional and wear properties of Ni-P-SiC composite coating
In order to improve the wear resistance and service life of journal, the basic research on the surface coating of metal materials and its tribological properties was carried out. Ni-P-SiC composite coatings with SiC particles up to 14.66 wt% were prepared by a process combination of electrophoretic deposition and chemical coating. The composite coating layers in coating state and after heat treatment were examined and dry friction and water-lubricated friction tests were performed. The results showed that the hardness and dry friction wear resistance of the composite coating layer increased and then decreased as the heat treatment temperature increased, which was related to the recrystallization of the base metal. Both the coating state under water-lubricated conditions and the composite coating after heat treatment can achieve a low friction state with a friction coefficient as low as 0.015.
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EXPERT FORUM
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Preparation of Transition Metal Carbides from Polyoxometalate Precursors
Zicheng XIAO
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