6results about How to "Uniform phase" patented technology

The utility model discloses a system for continuously producing methylated melamino-formaldehyde resin, which comprises a raw material storage tank A and a raw material storage tank B. The raw material storage tank A is connected with a micro-channel reactor A. A discharge port of the micro-channel reactor A is connected with a precooling pipe. A discharge port of the pre-cooling pipe and a discharge port of the raw material storage tank B are respectively connected with the micro-channel reactor B, and a discharge port of the micro-channel reactor B is connected with the receiving storage tank. According to the utility model, the reaction is continuously carried out in the micro-channel reactor, the raw material can be a high-solid-content raw material, the energy consumption and the raw material consumption are low, the quality difference of products among batches is small, and the production cost is reduced.

The invention discloses a primary phase change magnetic refrigeration alloy material and a preparation method thereof, the chemical formula of the alloy material is La0. 9Pr0. 1Fe12B6, and the alloy material has magnetocrystalline coupling and magnetoelastic coupling properties at the same time. The preparation method comprises the following steps: 1, preparing raw materials according to the chemical formula of the alloy material, and melting the prepared raw materials in a tungsten electrode non-consumable electric arc furnace to obtain an alloy ingot sample; and secondly, the ingot casting sample is subjected to heat treatment, and the La0. 9Pr0. 1Fe12B6 alloy material is obtained. According to the invention, the chemical formula of La1-xPrxFe12B6 is reasonably designed, the primary phase change magnetic refrigeration La1-xPrxFe12B6 alloy material with a lower critical magnetic field of magnetic field induced variable magnetic phase change is realized, and the material also has double coupling properties of magnetocrystalline coupling and magnetoelastic coupling.

The invention discloses a carbon-ceramic composite material, a preparation method thereof and a carbon-ceramic brake disc, and the preparation method of the carbon-ceramic composite material comprises the following steps: uniformly mixing silicon carbide, carbon fiber and an auxiliary agent to obtain carbon-ceramic prefabricated powder; placing the carbon-ceramic prefabricated powder in a mold of a direct-current rapid sintering device, and applying a first preparation operation means to obtain a to-be-sintered sample; starting a heating system of the direct-current rapid sintering device, heating to a first temperature, applying a second preparation operation means to the to-be-sintered sample, gradually heating to a second temperature, and keeping the temperature for a period of time; and closing the heating system, and naturally cooling to obtain the carbon-ceramic composite material. The preparation method provided by the invention is simple in preparation process, low in cost and short in time consumption, and the finally prepared carbon-ceramic composite material is uniform in phase distribution, good in mechanical property and beneficial to wide application.

The invention provides an ytterbium-doped iron selenium tellurium superconducting material and a preparation method and application thereof, the superconducting material comprises an iron element, an ytterbium element, a selenium element and a tellurium element, and the molar ratio of the iron element to the ytterbium element to the selenium element to the tellurium element in the superconducting material is (0.5-1.5): (0.01-0.1): (0.1-1): (0.1-1). A solid-phase sintering process is adopted, the sintering procedure is improved, the total sintering time is shortened to about 60 hours, and the preparation efficiency of the superconducting material is improved. And the prepared superconducting material is good in uniformity and high in density. In addition, the doping of the ytterbium element can promote the phase formation of the FeSeTe tetragonal phase and make the phase formation more uniform, improve the superconductive upper transition temperature, reduce the superconductive transition temperature width, and improve the superconductive performance of the superconductive phase body.

The application relates to the technical field of all-solid-state battery negative electrode materials, in particular to a high-entropy alloy negative electrode material and a preparation method and application thereof. The application provides a high-entropy alloy negative electrode material which comprises base elements and additive elements; the base elements comprise P and Ge, and a solid solution is formed between the P and the Ge; the additive elements comprise Zn and Al, and further comprise two or more than two of Si, Sn, Sb and Cu. The high-entropy alloy negative electrode material has high specific capacity, rate performance and long cycle stability.

The application discloses a Pd-Cu-M / alpha-Si3N4 supported metal catalyst and a preparation and application thereof. The preparation method comprises the following steps: step 1): dissolving palladium acetylacetone, copper acetylacetone and acetylacetone salt of metal M in a solvent to prepare a precursor solution, adding an alpha-Si3N4 carrier, and fully stirring to obtain a suspension; the metal M is a rare earth metal element; step 2): transferring the suspension obtained in step 1) into a polytetrafluoroethylene-lined steel autoclave, sealing in an induction heating electric furnace for heating, and cooling to room temperature; step 3): centrifuging the suspension cooled in step 2) to collect the solid, washing and drying the solid, and obtaining the Pd-Cu-M / alpha-Si3N4 supported metal catalyst after the drying is completed. The application provides the application of the catalyst in a low-temperature hydrogen catalytic oxidation reaction, and the catalyst has high hydrogen conversion rate and excellent stability.