58results about How to "Improve resistance to reduction" patented technology

The invention provides a mercuric chloride low-mercury catalyst and a preparation method thereof. The catalyst adopts active carbon as a carrier to adsorb mercuric chloride, and the formula of the catalyst comprises 8.0 to 10.0 percent of mercuric chloride, 8 to 13 percent of rare earth chloride assistant A, 5 to 25 percent of alkaline earth metal chloride assistant B, 10 to 20 percent of assistant C, and the balance of active carbon. The preparation method comprises the following steps: firstly, soaking the active carbon in hydrochloric acid solution at low temperature for standby; simultaneously dissolving the mercuric chloride, the assistant A, the assistant B and the assistant C together, and soaking the active carton in the solution; performing low-temperature pre-drying on an intermediate product; continuously drying the catalyst; and finally pumping a product at vacuum into a storage silo, packaging and leaving factory. The catalyst can reduce resource consumption and the pressure of treating mercury pollution; simultaneously the production cost is reduced, the poisoning resistance, reduction resistance and loss resistance are greatly improved, the catalytic performance of the catalyst is fully guaranteed, the using time can be prolonged and the using consumption can be reduced; and the catalyst is suitable for polyvinyl chloride manufacturers.

The invention discloses a high-dielectric-constant X8R type MLCC medium material. 100 parts, by weight, of barium titanate are used as base materials which are added with, by weight, 0.5-1.5 parts of niobium zinc compound, 1.5-2.5 parts of MBi4Ti4O15, 0.3-0.75 part of zirconic oxide, 3-4 parts of flux glass powder, 1-2 parts of silicon zinc compound, 0-0.2 part of manganic carbonate and 0-0.2 part of one or more of oxides of Er, Yb, Dy, Ho and Nd. M is one or more of Sr, Ca and Ba. According to the high-dielectric-constant X8R type MLCC medium material, a proper amount of niobium zinc compounds are added to easily form a core-shell structure. The core-shell structure can facilitate stability of the medium temperature of a medium material and reduce the temperature coefficient of capacitance of the material.

The invention relates to base metal copper electrode slurry and a preparation method of a capacitor from the same. The base metal copper electrode slurry comprises the following components (wt%): 30-65 wt% of spherical copper, 10-30 wt% of sheet copper, 1.52-10 wt% of glass powder, 2-15 wt% of inorganic non-metallic additive, and 10.5-24 wt% of organic carrier, wherein the glass powder is a ZnO-B2O3-SiO2-Bi2O3 glass system; the inorganic non-metallic additive is one or more selected from CuO, Cu2O, ZnO and B2O3; and the organic carrier is polymer resin and a solvent. The base metal copper electrode slurry can be used in a ceramic disc capacitor and a semiconductor disc ceramic capacitor chip, the sintering temperature is 600-800 DEG C, and after sintering, the copper electrode slurry is converted to a copper electrode. The base metal copper electrode slurry has the characteristics of low cost, uniform material, uniform particle size distribution, high dispersibility, good forming process, and environmental friendliness.

The invention relates to a method for preparing styrene through ethylbenzene dehydrogenation under the condition of a low water ratio, which mainly solves the problem that a low-potassium catalyst has poor stability under the condition of low water ratio in the prior art. In the invention, ethylbenzene is used as a raw material, the raw material and a catalyst are in contact to react to produce styrene under the conditions that the reaction air speed is 0.2-3.0/h and the weight ratio of steam/ethylbenzene is 0.5-2.5, wherein the adopted catalyst is formed by adding at least two elements of IIA-IVA families into the iron- potassium-cerium-molybdenum system, and the roasting temperature of the catalyst is 800-950 DEG C. for the technical scheme for preparing styrene through ethylbenzene dehydrogenation better solves the problem, and can be used for the industrial production of ethylbenzene dehydrogenation under the condition of low water ratio.

The invention relates to a high dielectric constant X8R type MLCC medium material and a preparation method, the high dielectric constant X8R type MLCC medium material takes 100 weight parts of barium titanate as a base material, and the medium material comprises the following components by weight: 1.6-2.5 parts of niobium cobalt compound, 0.722-1.805 parts of titanium bismuth sodium compound, 1.25-2.0 parts of zirconium calcium compound, 1-3 parts of glass powder, 0.369-1.2 parts of one or a plurality of oxides of Ce, Yb, Dy and Ho and 0.1-0.25 part of manganese carbonate. The key and core of the present invention are characterized in that a proper amount of manganese carbonate, rare earth elements and a zirconium calcium compound are added, the rare earth element can be taken as a donor or an acceptor in the barium titanate dielectric ceramic material for doping and modifying, the movement of the intrinsic oxygen vacancy and the oxygen vacancy brought by other B site donor doping can be inhibited, the insulation resistivity of a material system, the ageing resistance and the reduction resistance of a material system can be increased, and the method provided by the invention can be used for making silver-palladium electrodes and nickel electrodes MLCC.

The invention relates to a heat insulation spray coating, belonging to the field of fireproof materials. The heat insulation spray coating comprises the following components in parts by weight: 38-58 parts of waste lightweight clay bricks, 3-9 parts of raw perlite, 10-20 parts of cement, 20-30 parts of flint clay powder, 5-8 parts of Guangxi mud, 1-3 parts of talc powder and 0.5-2 parts of additional aluminum borate whiskers. The heat insulation spray coating disclosed by the invention can be used for rapid construction in use, is practical, does not need special maintenance, has good acid resistance and reduction resistance, is good in service performance, and is suitable for occasions requiring heat insulation or occasions with strong reducing properties.

The invention relates to a catalyst for low-water ratio ethylbenzene dehydrogenation, which mainly solves the problem that in the prior art, low-potassium catalyst has poor stability under the condition of low-water ratio. The invention adopts the technical scheme that ferrate is added into a ferrum-potassium-cerium-tungsten-magnesium catalytic system, so that the problem is well solved. The catalyst can be applied in industrial production of styrene prepared through ethylbenzene dehydrogenation under the condition of low-water ratio.

The invention discloses a composite oxide shown in the following chemical formula: Ce1-x(LnA1-yLnBy)xO2-x/2, wherein LnA and LnB are different rare earth elements which are respectively selected from a group comprising the elements of Sm, Gd, Pr, Nd, Y, Sc, Yb, La, Dy and Ho, x is greater than 0 and less than or equal to 0.2, and y is greater than 0 and less than or equal to 0.5. The invention provides a manufacturing method of a solid electrolyte which has high ionic conductivity and reduction resistance in a lower temperature range. The invention further discloses a sintering body and a solid electrolyte which are formed by the composite oxide and a manufacturing method of the composite oxide. According to the invention, the solid electrolyte formed by the composite oxide has high ionic conductivity and reduction resistance at low temperature.

The invention relates to a method for improving the structural stability of a BaCo0.7Fe0.2Nb0.1O3-Delta oxygen permeation membrane material, which belongs to the technical field of oxygen permeation membranes. The method is characterized in that Sr element is doped into the BaCo0.7Fe0.2Nb0.1O3-Delta base material with a perovskite structure, and the obtained oxygen permeation membrane material has a chemical formula of Ba1-xSrxCo0.7Fe0.2Nb0.1O3-Delta, wherein x is equal to 0.05-0.4. The oxygen permeation membrane material provided by the method remarkably improves the phase structure stability of the BaCo0.7Fe0.2Nb0.1O3-Delta base material under the condition of high temperature and low oxygen partial pressure, and the improved oxygen permeation membrane material can be applied within wider oxygen partial pressure range and under larger oxygen concentration gradient.

A BME ceramic dielectric capacitor ceramic material is prepared from BaTiO3, CaZrO3, rare earth oxide, Er2O3, MnO2, BaCO3, Co2O3, ZnB2O4 and Li2SiO3, the materials are matched in a certain proportion and subjected to ball milling, drying, prilling, circular slice green body pressing, organic matter discharging, sintering and the like. The rare earth oxide is one or several of Yb2O3, Ho2O3, Dy2O3, Sm2O3 and Y2O3. An X7R type MLCC material with excellent performance can be sintered at the reducing atmosphere, the preparation technology is simple, the formula design is simple and adjustable, the sintering technology is easy to control, the material is suitable for large-scale production, the uniformity of the material is good, the material has a high dielectric constant, a low dielectric loss and good high-temperature insulation resistance and insulation strength, the production cost of MLCC can be effectively reduced, and the application range of the material is enlarged.

The present invention provides a dielectric ceramic composition which can solve problems, involved in a conventional piezoelectric ceramic for an actuator using a tungsten bronze type composite oxide, i.e., a problem that the specific permittivity is so low (less than 2000) that the piezoelectric ceramic is unsuitable as a dielectric ceramic material for laminated ceramic capacitors, and a problem that, although Mn has the effect of improving the degree of sintering, since the specific permittivity is lowered with increasing the amount of Mn added, the conventional piezoelectric ceramic, when used as a dielectric ceramic material for laminated ceramic capacitors, poses a problem. The dielectric ceramic composition is composed mainly of a tungsten bronze type composite oxide represented by a compositional formula (K1-yNay)Sr2Nb5O15, wherein 0 = y < 0.2, and contains 0.1 to 40 parts by mole, based on 100 parts by mole of the main component, of Mn as an auxiliary component.

The invention relates to a novel tire shoulder separation-preventing agent. The tire shoulder separation-preventing agent comprises the following raw materials in percentage by mass: 15-50% of a heat stabilizer, 10-30% of reinforcing and hardening resin and 40-70% of a heat-conducting agent. The tire shoulder separation-preventing agent enhances the stability of a single-sulfur, bi-sulfur and multi-sulfur crosslink network in vulcanized rubber and has an excellent heat-conducting function, thereby enhancing reduction resistance of long-lasting high temperature aging resistance and saline water aging resistance of tire rubber and prolonging and improving the service life and the driving safety of a tire.

A compound having a high reduction resistance and being capable of sufficiently performing a function as an electronic conductive additive when added to a positive electrode active material as an electronic conductive additive is provided. In a method for producing a cobalt cerium compound including a step of depositing a hydroxide containing cobalt and cerium in an aqueous solution containing cobalt ions and cerium ions by changing the pH of the aqueous solution and thereafter performing a treatment of oxidizing the hydroxide, the ratio of the cerium ions contained in the aqueous solution containing the cobalt ions and the cerium ions is set to be more than 5% by atom and 70% by atom or less with respect to the sum of the cobalt ions and the cerium ions before the hydroxide is deposited.

The invention discloses a cerium-cobalt-coated nickel hydroxide composite material which is of a core shell type structure. A core is spherical nickel hydroxide, an outer coating layer is mainly hydroxide containing cerium and cobalt, the molar ratio of nickel hydroxide to cerium is 1:0.007 to 0.056, and the molar ratio of nickel hydroxide to cobalt is 1:0.025 to 0.125. A preparation method of the cerium-cobalt-coated nickel hydroxide composite material includes the steps that cerous salt and cobalt salt are dissolved, a complexing agent and a salt mixture solution are mixed and then complexed, the obtained mixed solution and precipitant are added to a solution containing spherical nickel hydroxide, cerium-cobalt even co-precipitation reaction is conducted, the coating layer is formed on the surface, washing, drying and oxidizing are conducted, and then the cerium-cobalt-coated nickel hydroxide composite material is obtained. The cerium-cobalt-coated nickel hydroxide composite material can serve and be used as a positive electrode energy storage material for improving the high-temperature performance of a nickel-metal hydride battery, and conductivity, reducibility resistance and high-temperature resistance of spherical nickel hydroxide can be remarkably improved.

A capacitor upper electrode and a wiring are electrically connected to each other by using a plug and a conductive layer formed below a capacitive element without using a plug that directly connects the capacitor upper electrode to the wiring provided thereon via an interlayer insulating film therebetween. Alternatively, the capacitor upper electrode is covered by a conductive hydrogen barrier film, and the capacitor upper electrode and the wiring are electrically connected to each other via both a plug connecting the wiring and the conductive hydrogen barrier film to each other and the conductive hydrogen barrier film.

The invention discloses an anti-reduction BME ceramic dielectric capacitor and a ceramic material for the capacitor. The ceramic material for the anti-reduction BME ceramic dielectric capacitor consists of the following raw materials: barium titanate, vanadyl oxalate, manganous nitrate, magnesium nitrate, strontium nitrate, rare earth nitrate A, rare earth nitrate B, chromic nitrate, barium nitrate, calcium bicarbonate, nano silicon dioxide and nano hafnium dioxide. By adding additives such as vanadyl oxalate, barium nitrate, calcium bicarbonate, nano silicon dioxide, nano hafnium dioxide and the like, the loss is reduced, the insulation resistance is improved, the dielectric withstand voltage is improved, and good electrical properties are obtained.

The invention discloses a dielectric material with a positive linear capacitance temperature change rate, and a preparation method thereof. According to the preparation method, [(1-x)BaTiO3-xBiyNazTiO3] is taken as a base material, and Nb2O5, RE2O3, MnCO3, and BiBO3 are added, wherein x=0.05-0.15, y=0.4=0.6, z=0.4-0.6, molar ratio of BaTiO3 to BiyNazTiO3 is (1-x):x, and RE is used for representing one or a plurality of elements selected from Sm, Er, or Ce. The dielectric material is suitable for preparing multilayer ceramic capacitors with a positive linear capacitance temperature change rate, and is low in dielectric loss; working temperature ranges from -55 to 150 DEG C, temperature stability is excellent (-15%<=delta C/C<=15%), and temperature changing accords with positive linear changing in the working temperature range. In the temperature range ranging from -55 to 150 DEG C, capacitance temperature compensating capacitors can be prepared from the dielectric material, compensating of negative effects caused by capacitor temperature increasing in functional circuits is realized, balancing of charge capacity in the whole temperature section is realized, and circuit stability and reliability are improved. The dielectric material possesses a promising industrialization prospect, and extremely high industrial application value.