30results about How to "Achieve practical purposes" patented technology

An in-situ EXAFS characterization method for the crystallization kinetics of amorphous alloys belongs to the field of nanocrystalline material preparation technology. It uses Fourier transform and structural function derivation, and uses a specific JMA equation for segmental fitting to analyze crystals. Kinetics, making the analysis more accurate and reliable.

The invention discloses a method for preparing nano-powder with a core-shell structure assisted by in-situ co-precipitation with surfactants. The preparation process is as follows: Weigh the nitrates of barium, strontium and magnesium according to the precise stoichiometric ratio and dissolve them in water to prepare A solution, and press Accurate stoichiometric ratio Weigh butyl titanate and dissolve in ethanol-oxalic acid solution to prepare B solution, weigh a certain amount of surfactant and dissolve in hot water-alcohol to prepare C solution, slowly drop ammonia into A, B and The co-precipitation reaction was carried out in the mixed solution of C, and the pH of the reaction system was controlled to be 2. After the precipitate was filtered, washed, heat-treated and ground, Ba1-nSrnTiO3@MgO core-shell nanopowder with high crystallinity was obtained. The preparation process of the invention is simple, the cycle is short, and the cost is low, and the obtained nano-composite powder has good dispersibility, uniform particle size, high crystallinity and coating structure, which can achieve the purpose of practical application.

The method for measuring the kinetic curve of the ordering process of metallic glass in situ by synchrotron radiation belongs to the field of nanocrystal preparation technology, and mainly solves the problem of dynamic characteristics of the ordering process of metallic glass, including: in-situ synchrotron radiation of ordering metallic glass Determination; atomic structure distribution calculation; data dynamics fitting; ordered dynamics feature analysis. This method can accurately and reliably measure and analyze the kinetic characteristics of the ordering process, so as to guide the production and preparation process of nanocrystalline materials and achieve the purpose of practical industrialization.

A method for characterizing the ordering process of metallic glasses by using EXAFS, comprising: measurement of EXAFS absorption spectrum of ordered metallic glasses; calculation of atomic structure distribution; data dynamic fitting; analysis of ordering dynamics characteristics. This method can accurately and reliably measure and analyze the kinetic characteristics of the ordering process, so as to guide the production and preparation process of nanocrystalline materials and achieve the purpose of practical industrialization.

The invention relates to a composite preparation method for a fine crystal titanium alloy, which comprises the following steps of: performing cold isostatic pressing and vacuum sintering on hydrogenated dehydrogenation titanium alloy powder, then performing first heating high-temperature isothermal forging by adopting medium strain rate over a transformation point to close internal holes of the powdery alloy, improve the compactness of the alloy and improve the plasticity of the alloy, performing second heating low-temperature isothermal forging by adopting medium strain rate below the transformation point to further compact and thin the powdery titanium alloy, and finally performing thermal treatment to obtain the high-compactness fine crystal powdery titanium alloy. According to the preparation method, the preparation period of common forged titanium alloy is effectively shortened, the loss of raw materials is reduced, near net shape precision forgings can be simultaneously formed, the prepared powdery titanium alloy has no component segregation, the compactness is more than 99 percent, the equiaxial tissues are uniform and fine, the size of alpha phase is less than 2 microns, and the mechanical property is excellent.

The invention relates to a method for preparing nano (1-x)Ba1-nSrnTiO3-xMgO complex-phase powder in situ by coprecipitation. A preparation flow comprises the following steps: weighing nitrates of barium, strontium and magnesium into water according to an accurate stoichiometric ratio to prepare a solution A; weighing butyl titanate according toan accurate stoichiometric ratio and dissolving into an ethanol-oxalic acid solution to prepare a solution B; slowly dropwise adding ammonia water into a mixed solution of the solution A and the solution B and carrying out a coprecipitation reaction; controlling the pH value of the reaction system to be 2-10; and carrying out filtering, washing, heat treatment and grinding on precipitate to obtain the nano (1-x)Ba1-nSrnTiO3-xMgO complex-phase powder. The preparation process is simple, short in period and low in cost; and the obtained nano complex-phase powder has good dispersity, uniform grain diameter and high degree of crystallization and can be put into practice.