1575results about How to "Small grain size" patented technology

The invention relates to a catalyst which is used for wet air oxidation technique and the preparation method in the field of environmental protection technology. The catalyst uses Gamma-Al2O3 as a vector and the oxide of transition metal Mn or Mn and rear earth element M or the oxide of the M as active components, wherein, M is one or two kinds in La and Ce and the loading of each metal relative to Gamma-Al2O3 vector is 5wt to 8wt percent. The catalyst takes Gamma-Al2O3 as the vector, is cleaned and roasted to be a consistent weight; the obtained Gamma-Al2O3 vector is immersed into the metallic salt solution of the rear earth element M and the transition metal Mn; the loading of each metal relative to the vector is 5wt to 8wt percent; the mixture after being immersed and dried is roasted in air to get the catalyst used in the wet air oxidation. The invention does not use expensive precious metal materials and greatly reduces the cost of the catalyst; at the same time, the catalytic activity of the catalyst is enhanced; the operation condition is improved; and the reaction time is shortened.

The invention discloses a five-element transition metal oxide high-entropy material for a lithium-ion battery. The high-entropy material is a five-element spinel type oxide high-entropy material formed by five transition metal positive ions, the chemical formula of the high-entropy material is (Cr0.2Fe0.2Mn0.2Zn0.2M0.2)3O4, wherein M is a divalent metal positive ion Co2+ or Ni2+. According to theinvention, a high-entropy oxide material with a spinel structure and different chemical compositions is regulated and controlled by changing the variety of divalent transition metal positive ions, sothat the electrochemical performance of the high-entropy oxide material is customized, and a nanocrystalline powder material with large specific surface area, small grain size and uniform chemical composition and microstructure is prepared through a combustion synthesis method. The five-element transition metal oxide high-entropy material for the lithium-ion battery has the advantages of large initial charge specific capacity, stable reversible specific capacity, good rate capability and good cycling stability.

The invention discloses a semi-aromatic transparent polyamide material and a preparation method thereof, belonging to the field of high-molecular materials. The material consists of a random copolymer of semi-aromatic amide salt and aliphatic amide salt and necessary auxiliaries; the intrinsic viscosity is 1.0-2.2dl / g, and the degree of crystallinity is less than 15%; the semi-aromatic amide salt is selected from amide salt 9T, amide salt 9I, amide salt 10T and amide salt 10I; and the aliphatic amide salt is selected from amide salt 610 and amide salt 1010. The preparation method comprises the following steps: adding the semi-aromatic amide salt, aliphatic amide salt and auxiliaries into a polymerization kettle; adding water which is 0.3-1.0 times the total mass of the semi-aromatic amide salt and aliphatic amide salt; in a protective gas atmosphere, stirring and heating to 160-210 DEG C within 1-2 hours, and performing constant-temperature pre-polymerization for 1-3 hours; heating to 240-300 DEG C, increasing pressure to 1-3MPa, and maintaining the pressure for reaction for 1-3 hours; slowly degassing to normal pressure within 1-4 hours; continuously stirring at constant temperature for 1-4 hours; and discharging after the reaction.

The invention discloses a preparation process of a sputtered rotary molybdenum-sodium-alloy tubular target. The preparation process comprises the following steps of: (1) preparing materials, wherein used powder comprises molybdenum powder and sodium molybdate powder, the physical property of the powder is as follows: the Mo content of the molybdenum powder is at least 99.95% with the granularity of 3-5 microns, and the sodium molybdate content of the sodium molybdate powder is at least 99.0% with the granularity of 20-40 microns; (2) blending the powder: weighing the molybdenum powder and the sodium molybdate powder proportionately, controlling the mass percentage content of the molybdenum powder to be 90-99% and that of the sodium molybdate powder to be 1-10%; (3) carrying out mechanical alloying: synthesizing nanometer molybdenum-sodium alloy powder; (4) filling into a die; (5) carrying out cold isostatic pressing; (6) sintering; (7) forging; (8) performing vacuum annealing; and (9) mechanically processing to obtain the sputtered rotary molybdenum-sodium-alloy tubular target. A produced molybdenum-niobium-alloy tubular target has characteristics of uniform elements, no segregation, fine grain size and high purity, completely meets requirements of CIGS (Copper Indium Gallium Selenide) photovoltaic cells and increases the use efficiency of the cells.

The invention provides CIGS powder, a CIGS target, a CIGS film and a preparation method thereof. The CIGS powder has a pure CuInxGa1-xSe2 phase, wherein x is more than 0 and is less than 1; and the CIGS target has a homogeneous CuInxGa1-xSe2 phase, and is obtained from the CIGS powder through cold isostatic pressing or compression molding and then sintering. The method for preparing the CIGS film comprises the steps of: depositing a layer of film by the CIGS target through a magnetron sputtering method, and then performing heat treatment on the film. The relative density of the CIGS target reaches over 95 percent, and the CIGS target has uniform components, has the homogeneous CuInxGa1-xSe2 phase, and has low production cost and steady performance. The preparation technology for the CIGS film greatly simplifies the prior process, and improves the utilization rate of raw materials and production efficiency.

The invention discloses a soft magnetic ferrite material and a preparation process thereof. The soft magnetic ferrite material comprises the following components: 52 to 55 mol of Fe2O3, 39 to 42 mol of Mn3O4, 5-8 mol of ZnO, 0.1 to 0.6 mol of additive 1, 0.1 to 0.2 mol of additive 2 and 0.006 to 0.06 mol of ZrO2, wherein the additive 1 is one or more of SnO2, CaCO3 and V2O5; and the additive 2 isone or more of Nb2O5, K2CO3, CaCO3, Ta2O5, SnO2 and V2O5. The soft magnetic ferrite material prepared by the process overcomes defects of the prior art and has the advantages of high frequency, high saturation magnetic flux density and low magnetic loss.