33results about How to "Stable phase structure" patented technology

The invention discloses a zirconium cladding surface resistant to high temperature and oxidation ZrCrFe/AlCrFeTiZr composite gradient coating preparing technology. Ultrahigh vacuum multitarget co-sputtering technique is adopted, a ZrCrFe/AlCrFeTiZr composite gradient alloy resistant to high temperature and oxidation protecting coating is prepared on the surface of a zirconium alloy base body, and the zirconium cladding surface resistant to high temperature and oxidation ZrCrFe/AlCrFeTiZr composite gradient coating preparing technology comprises the steps of predepositional treatment, bias voltage anti-splash washing and ZrCrFe/AlCrFeTiZr composite gradient alloy coating deposition. The preparing process of the composite coating is divided into two steps, the first step is to prepare ZrCrFe gradient transition layer coating, in a deposited ZrCrFe transition layer, the atomic percentage content of Zr element is changed from the gradient of 100 at%-35 at% in the thickness direction, the atomic percentage content of Cr element is changed from the gradient of 0 at%-33 at% in the thickness direction, and the atomic percentage content of Fe element is changed from the gradient of 0 at%-33 at% in the thickness direction; the second step is to prepare a AlCrFeTiZr high-entropy alloy coating, in a deposited AlCrFeTiZr high-entropy alloy coating, the atomic percentage content of Al element is controlled in 0.5 at%-1.0at %, and the atomic percentage of other elements is between 10 at%-35 at%. Bonding force of the coating prepared by the technology is excellent, the surface is dense and uniform, and the coating has excellent performance such as high strength, resistance to high temperature and oxidation and irradiation resistance.

The invention discloses a preparation method of a composite ceramic powder material used for an environmental barrier coating. The composite ceramic powder is composed of single phase BSAS (1-xBaO-xSrO-Al2O3-2SiO2, x is more than 0 and less than 1). The obtained BSAS composite ceramic powder has the advantages of easiness for ingredient control, high purity, high crystallinity and low synthesis temperature. The composite ceramic powder can be used for plasma spraying after being subjected to ball milling, agglomeration, pelletizing and high-temperature heat treatment, so that the environmental barrier coating is prepared on the surface of a C/C-SiC composite material, the coating can be used for effectively improving high-temperature water oxygen corrosion resistance performance of a C/C-SiC matrix, is applicable to surface high-temperature protection of other silicon substrate materials, can be used for solving the problem of high-temperature water oxygen corrosion of a silicon substrate composite material and has an important application value.

The invention discloses a preparation method of a high-strength and high-toughness high-entropy alloy, and relates to the technical field of alloy material production. The preparation method comprises the following specific steps that high-entropy alloy powder prepared from the components in atomic percent: 27%-30% of Mn, 8%-12% of Co, 8%-12% of Cr, 0.4%-1.3% of C and the balance of Fe is prepared; the high-entropy alloy powder is subjected to ball milling treatment and then pre-pressed, the pressure ranges from 300 MPa to 500 MPa, the pressure is maintained for 200 seconds to 300 seconds, and a pre-pressed block of the high-entropy alloy is obtained; the pre-pressing block is subjected to vacuum annealing, vacuum hot pressing sintering and cold rolling deformation; and the high-entropy alloy sheet subjected to cold rolling deformation is subjected to constraint carbon distribution treatment at the temperature of 400-550 DEG C, and free carbon elements are diffused. The C-containing unequal-atom FeMnCoCrC high-entropy alloy prepared through the method has excellent strength and plasticity combination, and meanwhile, the problems that a high-entropy alloy prepared through a traditional technology is uneven in component and unstable in structure are solved.

The invention discloses an Mn-Al-CNTs type alloy as well as a preparation method and an application method thereof, relating to a manganese-based alloy. The components of the Mn-Al-CNTs type alloy based on atomic percentage are as follows: Mn50+xAl50-y(CNTs)y-x, wherein the limited ranges of x and y are as follows: x is not less than 1 and not more than 3, y is not less than 4 and not more than 5, and y-x is not less than 1 and not more than 3; the preparation method of the Mn-Al-CNTs type alloy comprises the following steps of: preparing cast alloys after raw materials preparation, melting and smelting, and then preparing final Mn-Al-CNTs type alloy products after treatments of solution and annealing; and the application method of the Mn-Al-CNTs type alloy is as follows: preparing the Mn-Al-CNTs type cast alloy into an annealing Mn50+xAl50-y(CNTs)y-x type alloy thin strip magnet. The invention further improves the magnetization intensity and the coercive force of the Mn-Al type alloy so as to further improve the permanent magnetism performance and the machining property of the Mn-Al type alloy materials.

The invention provides a novel CO sulfur-tolerant shift catalyst and a preparation method thereof, and a carrier of the catalyst is titanium dioxide; active ingredients comprise molybdenum and cobalt or/and nickel; and auxiliaries which refer to at least one compound of magnesium, calcium, zinc, zirconium, cerium and lanthanum also can be added in the carrier. The invention further provides the preparation method of the novel CO sulfur-tolerant shift catalyst. The catalyst has high shift activity and particularly has high low-sulfur activity and stable structure; furthermore, the catalyst has very high activity without performing prevulcanization before use, thereby simplifying the operation procedure; when the sulfur content in raw material is low (50ppm), sulfur does not need to be supplemented additionally; in addition, the catalyst further has excellent performances of anti-hydrate phase change and anti-sulfation, and can greatly expand the application range of the CO sulfur-tolerant shift catalyst.

The invention relates to the technical field of powder metallurgy preparation of refractory metal materials, and specifically discloses a preparation method of a powder metallurgy refractory multi-principal-element high-entropy alloy. The preparation method of the powder metallurgy refractory multi-principal-element high-entropy alloy specifically comprises the following steps: step S1, refractory metal element powder is sieved through a 300-mesh sieve and mixed in a multi-element powder mixing mode, so that a mixture is obtained; the mixture comprises at least four elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W; the atomic percent of each element in the mixture is 5%-35%; and the total percentage is 100%; step S2, pressing forming is carried out, and a pressed blank is obtained; and S3, vacuum high-temperature solid-phase sintering is carried out to obtain a sintered block. The preparation method of the powder metallurgy refractory multi-principal-element high-entropy alloy has the advantages that the components are easy to regulate and control, the production efficiency is high, and near-net forming is achieved; the prepared powder metallurgy refractory multi-principal-element high-entropy alloy is stable in structure and performance and low in cost; and the powder metallurgy refractory multi-principal-element high-entropy alloy has remarkable advantages in research and development of high-performance powder metallurgy refractory multi-principal-element high-entropy alloy and flexible batch production of products of various shapes and varieties.

The invention discloses a composite molybdenum-based catalyst. The composite molybdenum-based catalyst consists of an active component Mo and an auxiliary agent K, wherein molar percentages are as follows: 66.7-96.8% of Mo and 3.2-33.3% of K; Mo exists in a composite form of any two or three phases of a metallic state, oxide and carbide. The invention further discloses a preparation method of the composite molybdenum-based catalyst. The preparation method comprises the following steps: firstly, raising the temperature by using a controlled program to reduce and carbonize MoO3 powder; secondly, impregnating by a wet impregnation method; finally, grinding, tabletting and granulating the powder. The composite molybdenum-based catalyst has the benefits as follows: during CO hydrogenation reaction, the composite molybdenum-based catalyst has high catalytic activity and olefin selectivity, the CO single-pass conversion rate being higher than 80% and the olefin-paraffin ratio (O/P) being higher than 4.0, a product mainly comprises light hydrocarbons (C1-C5), C2-C4 olefins account for more than 49% of the total hydrocarbon content and the C5+ selectivity is lower than 15%; before and after the CO hydrogenation reaction, composite molybdenum-based catalyst is stable in phase structure and is suitable for long-term operation. The preparation method of the composite molybdenum-based catalyst is simple in preparation process and easy to control conditions and has relatively high repeatability.

The invention provides a phase change heat storage material. The phase change heat storage material is prepared from, by weight, 3-80% of inorganic salt, 30-50% of heat conduction oil, 3-80% of organic wax, 1-35% of water and 2-30% of a surfactant, wherein a mixture of diaromatic hydrocarbon ether and biphenyl is preferably selected as the heat conduction oil. By introducing a certain amount of heat conduction oil into the phase change heat storage material, the heat storage capacity of the material can be significantly improved, so that the material is higher in heat storage density which isup to 260 kJ/kg, larger in heat conductivity coefficient and more sensitive to the ambient temperature; moreover, the particle size of microemulsion particles in the obtained phase change heat storagematerial is larger and more uniform, and therefore the material is more stable to store.

The invention relates to an environment-friendly high-tech powder material for a ceramic roller. The powder material is prepared from the following raw materials in parts by weight: 100 parts of high-purity fused quartz powder, 20-50 parts of aluminum-doped zinc oxide, 25-35 parts of lanthanum strontium manganese oxide, 10-18 parts of titanium diboride, 20-30 parts of boron carbide, 5-8 parts of carbon black and 8-15 parts of aluminum oxide. The preparation method comprises the following steps: weighing the raw materials in parts by weight according to the formula, putting the raw materials into a planetary ball mill for ball milling for 4-5 hours, and drying to obtain a mixed powder; and then putting the mixed powder into a plasma activation calcining furnace to be calcined for 1 to 2 hours so as to obtain the environment-friendly high-tech powder material for a ceramic roller. The powder material disclosed by the invention is a novel functional ceramic powder material and can be used as a powder material for a dielectric and piezoelectric multiphase quartz ceramic roller; and the multiphase quartz ceramic roller disclosed by the invention has the advantages of high temperature resistance, water vapor resistance, good dielectric property and piezoelectric property, stable phase structure, good uniformity, high compactness and stable and superior performance, and has great production benefits and practical values.

The invention discloses a zirconium pyrophosphate-based mixed conductor hydrogen permeation membrane material with a layered structure and capable of being operated at medium and low temperatures as well as a preparation method and application of the zirconium pyrophosphate-based mixed conductor hydrogen permeation membrane material. The chemical general formula of the mixed conductor hydrogen permeation membrane material is Zr<1-x> MxP2O<7-delta>, wherein M is one of Mg and Cu; and delta is a non-stoichiometric ratio, x is greater than or equal to 0 and less than or equal to 0.5, and delta is greater than or equal to 0 and less than or equal to 1. As the zirconium pyrophosphate-based compound has a stable phase structure in a wide temperature range (200-600 DEG C), the mixed conductor hydrogen permeation membrane material still keeps a local layered structure after being sintered at high temperature, and a rapid proton transfer channel formed between layers further increases the hydrogen permeation amount of the membrane material. The zirconium pyrophosphate-based mixed conductor hydrogen permeation membrane material with the layered structure prepared by the preparation method disclosed by the invention shows very high hydrogen permeation quantity and good chemical stability at medium and low temperatures.

This disclosure provides new heat sealable, barrier laminate packaging structures used for beverage component pouches or cartridges, including new structures and chemical compositions of the pouch made to contain the beverage base, component, or component concentrate. These structures and compositions used for heat sealable, barrier laminate packaging balance good heat sealability with improved performance for flavor scalping, oxygen permeability, and/or undesirable moisture ingress or egress, which affect the stability and useful life of the pouch or cartridge and its contents.