31results about How to "Atomic radius is large" patented technology

The invention discloses a seven-element high-entropy alloy coating prepared by laser cladding and a preparation method thereof, belonging to the technical field of alloy surface coating modification; the high-entropy alloy powders are Al, Co, Cr, Fe, Mo, V, Ti . The matrix material is Ti-6Al-l4V (TC4) titanium alloy, and the atomic fraction of each raw material in the high-entropy alloy powder is Al (10%-16%), Co (11%-15%), Cr (9%-16%) ), Fe (6%-15%), Mo (8%-17%), V (8%-15%), Ti (12%-16%), the sum of all components is 100%. by CO 2 The high-energy laser beam emitted by the laser clads the configured alloy powder on the surface of the substrate to form a high-entropy alloy coating. The substrate and the cladding layer are metallurgically combined to achieve the purpose of surface modification, thereby increasing the hardness of the titanium alloy. , wear resistance and corrosion resistance, thereby extending the service life of titanium alloys.

The invention relates to a compound manufacturing method of an acid leaching stirrer, which uses iron-based amorphous powder as a spraying material, adopts supersonic flame spraying technology to heat and accelerate the powder, and prepares a layer of 150-250 μm thick on the surface of the stirring shaft or blade Iron-based amorphous coating, the chemical ratio of iron-based amorphous powder by mass percentage: chromium 0-25%, molybdenum 0-10%, tungsten 0-5%, niobium 0-12%, lutetium 0-4%, 0-7% manganese, 0-5% boron, 0-4% carbon, 0-3% silicon, 0-2% rare earth elements, and the rest is iron; the service life of the prepared composite stirring shaft and blade is several times For traditional stainless steel products.

The invention provides a negative ion far infrared nanometer multifunctional material, which comprises the following ingredients in parts by weight: 1 to 86 parts of ore powder, 1 to 115 parts of rare earth powder and 1 to 200 parts of silica gel. The functional material provided by the invention has the advantages that on the basis of the prior art, the functional material capable of obviously improving the capability of generating negative ions of ore and rare-earth salts through air ionization is provided; on the other hand, the infrared ray releasing capability of the ore and the rare-earth salts can be obviously improved.

The invention discloses a Zn-Sb-Bi thin film material for multi-state phase change memory and a preparation method thereof, which is characterized in that the thin film material is composed of metal single substance Bi target and Zn 2 Sb 3 The alloy target is obtained by double-target co-sputtering in the magnetron sputtering coating system, and its chemical structure is (Zn 2 Sb 3 ) 100‑x Bi x , where 0≤x<14, among which the phase change material Zn is preferred 2 Sb 3 and (Zn 2 Sb 3 ) 96.8 Bi 3.2 It has higher crystallization temperature, larger crystallization activation energy and stronger ten-year data retention. Compared with traditional three-state GST phase change materials, the three-state phase change memory material has higher crystallization temperature and phase transition temperature. , and the crystalline resistance is larger, with 3 resistance states, while other Zn-Sb-Bi films with higher Bi content exhibit 4 resistance states, which can achieve higher multi-bit multi-value storage.

The invention discloses a high-performance rhodium-containing catalyst and a preparation method thereof. The catalyst of the present invention consists of a substrate and a catalyst coating coated on the surface of the substrate. The catalyst coating consists of catalytic materials and noble metals. The catalyst coating includes at least a rhodium catalyst layer, and can also include palladium, platinum or platinum-palladium mixed in a certain proportion. Catalyst layer; the preparation method of rhodium catalyst layer comprises: concentration of 10% by weight rhodium solution is concentrated to 40-100% under continuous stirring at 40-90° C., adding alcohols and reacting for 0.5-5h, the solution viscosity is 5-50Pa.s, Then add the alcohol amine solution to adjust the pH to 3.5-10.5, continue to stir for 5-60min, take out the rhodium solution and add it to the catalytic material to form a powder / slurry, and then coat it on the substrate to form a rhodium catalytic layer. The catalyst prepared by the invention is used for treating motorcycle tail gas or gasoline car tail gas, and has the advantages of easy-to-obtain raw materials, simple preparation process, low catalyst light-off temperature and good durability.

The invention discloses an aluminum-silicon-magnesium casting alloy mechanical property improving method. Light rare earth is adopted and cooperates with heavy rare earth to process alloy melt, and the iron content is 0.09-0.20 wt% of the alloy melt mass. According to the improving method, based on the difference, in the aspect of physicochemical property, between light rare earth elements and heavy rare earth elements as well as the influence on the alloy crystallization process, the method of utilizing the light rare earth and the heavy rare earth to be combined and modified to control the microstructure and mechanical property of alloy is provided, the light rare earth and the heavy rare earth give play to advantage separately, namely, the light rare earth is focused on enriching on thealpha-Al and Si crystal solidification front and being adsorbed on the surface of crystal, and achieves the effects of refining and modifying; and the heavy rare earth is focused on adsorbing or conducting solid solution on iron-rich Al-Fe and Al-Fe-Si group harmful compound, influencing the microstructure of the compound, impeding growth of crystal, and promoting the compound to be decomposed into short rod-like shape or granular shape at the high temperature; and the light rare earth and the heavy rare earth achieve mutual complementarity in the aspect of controlling the microstructure of the alloy, and substantially, the quite good modifying effect is achieved.

The invention provides a preparation method of sucrose-6-benzoate, which comprises the following steps: by using sucrose as a raw material, methyl benzoate as an esterifying reagent and an alkali carbonate as a catalyst, synthesizing sucrose-6-benzoate under vacuum distillation conditions; and by using the polar difference between the sucrose and the sucrose-6-benzoate, adding a low-polarity solvent to precipitate unreacted sucrose, thereby purifying the sucrose-6-benzoate. The method can enhance the yield and purity of the sucrose-6-benzoate and recycle the unreacted sucrose, has the advantages of environment-friendly technique, low facility request and high economical efficiency, provides a new way for synthesizing sucrose-6-benzoate, and is suitable for the demands for large-scale industrial production.