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

The present invention relates to silico fluorene copolymer and its application. The silico fluorene copolymer is copolymer of 2, 7-silico fluorine and narrow band gap monomer, and has absorption spectrum with absorption side band greater than 500 nm and absorption band side expanded to red light and near infrared region. It is prepared through copolymerizing 2, 7-silico fluorine and narrow band gap monomer containing hetero N and/or S atoms. It may be applied in making polymer solar cell, FET, etc. It has high mobility, high long-term stability and high energy converting efficiency.

The invention discloses a preparation method and application of 2,1,3-benzoselenadiazole derivative. The derivative is TPE-Se-TPE, TPA-Se-TPE or TPA-Se-TPA, i.e., tetraphenyl ethylene (TPE) and/or triphenylamine group (TPA) are respectively introduced on a 4 position and a 7 position of the 2,1,3-benzoselenadiazole derivative. The prepared 2,1,3-benzoselenadiazole derivative has the advantages that the phenomena of aggregation and quenching can be effectively avoided, the properties of aggregation, induction and luminescence are achieved, and the luminescence efficiency of the material can be obviously enhanced, so that the 2,1,3-benzoselenadiazole derivative can be applied to an organic electroluminescence device as a luminescent layer.

The invention discloses a method for carrying out epitaxial wafer and silicon wafer bonding by indium (In). The method comprises the steps as follows: an indium (In) layer is deposited on the silicon wafer where a gold (Au) layer is evaporated, and the gold (Au) layer is evaporated on the epitaxial wafer where a reflecting mirror layer is deposited; the two wafers (the indium (In) layer in the middle) face relatively and are put into a bonding machine for bonding, so as to prepare an LED (light-emitting diode) device with the advantages of high efficiency, high brightness, low resistance and steady performance. The epitaxial wafer and silicon wafer bonding is carried out by the method, the bonding area is compact and hole-free, the bonding strength is high, and the bonding rate can reach above 98%. The bonding area of a prepared substrate slice has no pollution layer, polycrystalline layer or oxide layer, so that the performance of the prepared light-emitting diode device is greatly improved.

The invention discloses a high-performance rhodium-containing catalyst and a preparation method thereof. The catalyst disclosed by the invention is composed of a matrix and a catalyst coating, wherein the surface of the matrix is coated with the catalyst coating; the catalyst coating is composed of a catalytic material and precious metals; and the catalyst coating at least comprises a rhodium catalyst layer and can further comprise palladium, platinum or a catalyst layer formed by mixing platinum and palladium at a certain ratio. A method for preparing the rhodium catalyst layer comprises the following steps: concentrating a rhodium solution with the mass percentage concentration of 10% until the mass percentage concentration is 40-100% while continuous stirring at the temperature of 40-90 DEG C; adding alcohol, and reacting for 0.5-5 hours, wherein the solution viscosity is 5-50 Pa.s; and adding an alkanolamine solution, regulating the pH value to be 3.5-10.5, continuously stirring for 5-60 minutes, taking out the rhodium solution and adding into the catalytic material so as to form powder/slurry; coating the matrix with the powder or slurry, thereby obtaining the rhodium catalyst layer. The catalyst prepared according to the preparation method is used for treating motorcycle exhaust or gasoline car exhaust, and has the advantages of readily available raw materials, simple preparation process, low initiation temperature and excellent durability.

The invention discloses a laser-cladding seven-element high-entropy alloy coating and a preparation method thereof, and belongs to the technical field of alloy surface coating modification. High-entropy alloy powder is prepared from Al, Co, Cr, Fe, Mo, V and Ti; a substrate is Ti-6Al-14V(TC4) titanium alloy, the atom fraction of each raw material in the high-entropy alloy powder is Al (10% to 16%), Co (11% to 15%), Cr (9% to 16%), Fe (6% to 15%), Mo (8% to 17%), V (8% to 15%) and Ti (12% to 16%), and the sum of all components is 100%. The high-entropy alloy coating is formed by cladding the prepared alloy powder on the surface of the substrate by a high-energy laser beam emitted from a CO2 laser, the substrate and a cladding layer are metallurgically combined to achieve the purpose of surface modification, thus the hardness, wear resistance and corrosion resistance of titanium alloy are improved, and the service life of the titanium alloy is further prolonged.

The invention relates to a composite manufacturing method of an acid leaching stirrer. Iron-based amorphous powder is taken as a spraying material, the supersonic flame spraying technology is adoptedto accelerate the heating of the powder, and an iron-based amorphous coating with the thickness of 150-250 [mu]m is prepared on the surface of a stirring shaft or a paddle. The iron-based amorphous powder is prepared from the following components in percentage by mass: 0-25% of chromium, 0-10% of molybdenum, 0-5% of tungsten, 0-12% of niobium, 0-4% of lutetium, 0-7% of manganese, 0-5% of boron, 0-4% of carbon, 0-3% of silicon, 0-2% of rare earth element and the balance of iron. The service life of the prepared composite material stirring shaft and paddle is several times longer than that of traditional stainless steel products.

The invention discloses a Zn-Sb-Bi thin film material used for a multi-state phase change memory, and a preparation method of the thin film material. The thin film material is characterized in that the thin film material is obtained from an elementary metal Bi target and a Zn<2>Sb<3> alloy target in a magnetron sputtering film coating system through dual-target co-sputtering; the thin film material has the chemical structural formula of (Zn<2>Sb<3>)<100-x>Bi<x>, wherein x is greater than or equal to 0 and less than 14, wherein the preferable phase change material Zn<2>Sb<3> and (Zn<2>Sb<3>)<96.8>Bi<3.2> have relatively high crystallization temperature, relatively high crystallization activation energy and relatively high retentivity of data of ten years; and compared with a three-state phase change memory material and the conventional three-state GST phase change material, the thin film material has the advantages of high crystallization temperature and high phase conversion temperature, higher crystalline state resistance and has three resistance states, while the other Zn-Sb-Bi thin film with higher Bi content represents four kinds of resistance states, so that higher multi-bit and multi-valued memory can be realized.

The invention discloses a production method for an environmentally friendly, cheap and stable ceramic colorant which is a ferrosilicon red ceramic colorant. The key point of the method is: lanthanum carbonate is introduced into a formulation and is used to effectively and completely enwrap ferric oxide together with silicon dioxide through high-activity lanthana decomposed from the lanthanum carbonate at a temperature of 900 DEG C and the property of having a greater atomic radius of the lanthanum carbonate, thereby enabling the ferric oxide to show stable colors without impacts from ambient surroundings. In addition, the ferrosilicon red ceramic colorant adapted to different temperatures is manufactured through changing the processing conditions.

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.

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 discloses a preparation method of a rare earth permanent magnet material, which comprises the following steps: arranging rare earth bromide powder on the surface of a sintered magnet, and carrying out heat treatment on the magnet and the powder at a temperature lower than the sintering temperature of the magnet so as to carry out rare earth diffusion. According to the method, Br witha large atomic radius is used for replacing an F or O element, rare earth bromide is used as a novel grain boundary diffusion source, the surface of the sintered magnet is coated with the novel diffusion source, and rare earth elements are diffused into the magnet through tempering treatment; the rare earth bromide has the characteristics that the rare earth bromide is easy to decompose, the atomic radius of the bromine element is large, the bromine element is easily volatilized into the environment and only slightly diffuses into the magnet, the influence on the microstructure of the magnetis small, rare earth elements are easier to diffuse into the magnet, the diffusion depth is large, and the coercive force of the magnet is obviously improved; and meanwhile, the temperature stabilityand the corrosion resistance of the magnet are improved.

The invention discloses a conduction cavity type electroluminescent material and a preparation method and an application thereof. A molecular structure general formula of the conduction cavity type electroluminescent material is shown as the following formula (I), wherein D is an electron-donating group, and R is a C1-C12 linear chain or alkyl with a branched chain. The conduction cavity type electroluminescent material is prepared by the copolymerization of an anthracene structural unit, a selenophen structural unit and a truxene structural unit, so that the conduction cavity type electroluminescent material is stable in structure and excellent in thermal stability and cavity transmission performance, enhances fluorescence emission, and has great application prospect in the field of photoelectricity. The conduction cavity type electroluminescent material is simple in preparation technology and easy to operate and control, reduces the production cost, and is suitable for industrial production.

The invention belongs to the technical field of abrasion-resistant materials, and particularly relates to an abrasion-resistant clamping plate and a preparation method thereof. The abrasion-resistantclamping plate is prepared from the following chemical components in percentage by weight: 1.5-2.9% of carbon, 0.4-0.8% of silicon, 0.4-0.85% of magnesium, 0.4-1.0% of manganese, 14-17% of chromium, 0.5-1.0% of molybdenum, 0.1-0.22% of nickel, 0.05-0.20% of titanium, 0.005-0.04% of phosphorus, 0.005-0.04% of sulfur, and the balance of iron. The abrasion-resistant clamping plate is reasonable in formula, easy to manufacture and long in service life, and has quite high strength, toughness, abrasion resistance and impact resistance, the frequency for replacing the clamping plate in a factory is decreased, and the labor intensity is lowered.

The invention belongs to the technical field of wear-resistant materials, and particularly relates to a moving spraying nozzle ring and a preparation method thereof. The moving spraying nozzle ring isprepared from the following chemical components in percentage by weight: 1.5-2.9% of carbon, 1.2-2% of silicon, 0.6-0.9% of copper, 0.4-1.0% of manganese, 14-17% of chromium, 0.05-0.2% of molybdenum,0.1-0.2% of nickel, 0.05-0.20% of boron, 0.005-0.04% of phosphorus, 0.005-0.04% of sulfur, and the balance of iron. A formula is reasonable, manufacturing is easy, the service life is long, quite high strength, toughness, wear resistance and impact resistance are achieved, the frequency of replacing a clamping plate in a factory is reduced, the labor intensity is lowered, raw materials are easy to obtain, a production method is simple, and energy is effectively saved.