47results about How to "High low temperature strength" patented technology

The invention relates to austenitic stainless steel which is high in low temperature strength, low temperature toughness and low temperature non-magnetism as well as better in neutron irradiation resistance, can be used in a magnet support structure of a nuclear fusion reactor, and comprises the components by mass percent: 16.00-22.0% of Cr, 8.00-12.00% of Ni, 1.00-3.00% of Mo, 0.06-0.25% of N, 0.010-0.040% of C, 1.00-4.00% of Mn, less than or equal to 1.00% of Si, 0.01-0.10% of Nb, 0.01-0.10% of Ta, 0.030-0.10% of Co, less than or equal to 0.03% of P, less than or equal to 0.005% of S, 0.0005-0.0018% of B, and the balance of Fe and unavoidable impurities; and furthermore, the value of Val (Cr-Ni) is less than 20.5, and Val (Cr-Ni)= 3* (Cr+Mo)+4.5*Si-2.8*Ni-1.4*Mn-84*(C+N).

The invention discloses a preparation method of an artificial core in a petroleum geology research. The preparation method comprises the following steps: during the process of cementing quartz sand and epoxy resin through a cementing agent, introducing a nano porous material and a metal thin sheet, performing curing under pressure, soaking a core in acid or alkali or leaching the core to form slits, finally flushing the artificial core with distilled water, and drying. By the adding of polyethylene glycol and citric acid, the artificial core has high surface wettability, and the surface property is closer to natural core. According to the preparation method, the slits, micron-level pores and nano-level pores of the artificial core can be quantitatively controlled, so that the prepared artificial core is extremely high in similarity with the natural core and can meet simulation and test on such physical properties as sound wave, transfusion and conductivity of the core in the petroleum geology research, thus providing an experimental support for oil-gas exploration development.

The present invention relates to method of preparing mineral bonding material and its composite materials with phosphate and aluminum-silicon material at relatively low temperature. Under relatively low temperature, aluminum-silicon material with reaction activity is made to produce bonding reaction with phosphate to obtain one kind of amorphous solid Al-Si-P mineral bonding material. The Al-Si-P mineral bonding material may be used as basic material to prepare various composite materials with different performance via adding bauxite, silicon powder, flyash, mineral slag, fiber, etc. The said composite materials may be formed through casting or pressing, and the materials have excellent endurance, high mechanical strength and good high temperature performance.

The invention discloses a 0.5mm sensitivity double-skip-bucket type rainfall sensor. The bottom of a cylindrical rain container is provided with a base; the base of the rain container is provided with a lower water collector, a large skip bucket, an upper water collector, a small skip bucket and a funnel from bottom to top in turn; each water collector is arranged on a vertical plate; and an anti-blocking device is arranged above the funnel. The upper small skip bucket is designed to be a symmetric slope container, the lower large skip bucket is designed to be a labyrinthic container, the centers of gravity of a left bucket chamber and a right bucket chamber of each skip bucket are symmetric, and the skip bucket swings in a balanced way, so that stable performance is guaranteed during impact of heavy rains, and the sensor has high measuring accuracy. A hydrophobic layer has high flushing resistance and high surface hardness, and is environment-friendly and safe. Error is not influenced by raininess, and instant rainfall can be measured. Stable work and accurate measuring data of the rainfall sensor are guaranteed. Failed components can be easily approached during maintenance, and the failed components are easy to disassemble and replace, so that the manufacturing cost and the field maintenance cost are reduced.

A method for producing a sintered ore (50a) which comprises forming, on the surface of a nucleus particle (51) containing an iron ore, a first coating layer (52) using an iron-containing substance and optionally an SiO2-containing material, and subsequently a second coating layer (53) using limestone and a solid fuel based material, to prepare a granulated particle (50), and then sintering the granulated particle (50), wherein the iron-containing substance used for forming the first coating layer (52) has a porosity of 20 % or less or has a porosity of 20 % or less and a content of Al2O3 of 2.1 mass % or less, and wherein the iron ore for the nucleus particle has a porosity higher than that of the iron-containing substance used for the first coating layer (52) or has a porosity and/or a content of Al2O3 higher than that or those of the iron-containing substance.

The invention relates to a low-cost high-strength high-temperature-resistant fireproof coating material and a preparation method thereof. The coating material is characterized by comprising, by mass, 45 to 50% of grade-III high-alumina bauxite with a particle size of 5 to 1 mm, 10 to 15% of grade-I high-alumina bauxite with a particle size of 1 to 0 mm, 23 to 28% of grade-I high-alumina bauxite with a particle size of less than 180 meshes, 7 to 8% of pure calcium aluminate cement, 2 to 3% of silica micropowder, 2 to 3% of soft clay, 0.02 to 0.05% of an extra water reducer and 0.03 to 0.06% of an extra flocculating agent. According to the invention, through addition of the water reducer, water addition in construction of the coating material is greatly reduced, so the strength of the coating material is improved; through addition of the flocculating agent, water addition in construction of the coating material is not increased and the coating material with the water reducer is deprived of fluidity, so good coating properties are obtained; and through usage of early-strength cement with high content of a CA phase, the strength of the coating material is further improved.

The present invention relates to one kind of mineral bonding material prepared with phosphoric acid and alumina and silica material at relatively low temperature and its composite material. At relatively low temperature, alumina and silica material with reaction activity and phosphoric acid produce bonding reaction to form one kind of amorphous solid mineral bonding Al-Si-P material. The mineral bonding Al-Si-P material may be used as base material and added with bauxite, silica powder, flyash, mineral slag, fiber, etc to prepare various kinds of composite material with different performances. The composite materials may be cast or pressed to form optionally without needing of introducing alkali earth ions, and the prepared material has high durability, high mechanical strength and good high temperature performance.

The invention relates to a flow controlling water gap for production of mineral wool from blast furnace slag and a production process thereof, and belongs to the field of refractory materials. The flow controlling water gap is prepared from the following components: 3-6% of electrically-fused zirconia corundum with the granularity of 3-1mm, 20-25% of electrically-fused zirconia corundum with the granularity smaller than or equal to 0.088mm, 25-35% of green silicon carbide with the granularity of 1-0.5mm, 5-15% of green silicon carbide with the granularity of 0.5-0.21mm, 20-25% of green silicon carbide with the granularity of 0.21-0.088mm, 3-5% of fused quartz with the granularity of 0.5-0.21mm, 1-2% of fused quartz with the granularity of 0.21-0.088mm, 1-2% of expanded graphite with the granularity of smaller than or equal to 0.020mm, 2-3% of chrome green with the granularity of smaller than or equal to 0.020mm, 1-2% of silicon powder with the granularity of smaller than or equal to 0.010mm and 2-4% of plaenolic resin binder. The production process comprises the following steps: mixing, ageing a mixture, performing isostatic pressing forming, drying, sintering, performing flaw detection, performing glaze spraying and the like. The flow controlling water gap has excellent erosion resistance, heat shock resistance and oxidation resistance, and has the service life of more than 20 days, which is far longer than the service life of graphite water gap (about 4 days).

The invention provides high temperature resistant composite cement. The high temperature resistant composite cement is prepared from 48-72 parts of a portland cement clinker, 5-9 parts of gypsum, 11-17 parts of activated sludge, 12-33 parts of fly ash, 3-6 parts of limestone, 12-33 parts of electric furnace slag, 11-32 parts of granulated blast furnace slag, 2-4 parts of ceramic fibers and 2-5 parts of rubber powder. The high temperature resistant composite cement has the advantages of stable thermally recovered cement physical and chemical properties and easy engineering performance distribution. A preparation method of the high temperature resistant composite cement is simple, is convenient to operate and realizes a low cost, strong production controllability and good consistency of the product. The thermally recovered cement has high low temperature strength, prevents strength declining after high temperature treatment and has good high temperature resistance. Through use of phosphor slag and other slag, compressive strength reduction of aluminate cement in a hydration later period is solved and set cement compressive strength after treatment at a temperature more than 300 DEG C is guaranteed. Through use of ceramic fibers and rubber powder, the toughness of brittle aluminate cement is improved and downhole condition demands are satisfied.

The invention provides a powder core wire and a low-temperature-resistant high-entropy alloy prepared by electric-arc deposition of the powder core. The powder core wire comprises an aluminum belt anda powder core, wherein each of the aluminum belt and the powder core consists of Co, Cr, Fe, Ni and Cu in an equal atomic ratio being 1 to 1 to 1 to 1 to 1 to 1; and the thickness of the aluminum belt is 0.5 mm. The preparation method for the wire comprises the following steps of: (1) preparing the powder core; (2) spraying a deposited powder core; (3) performing cold-rolling; and (4) performingtube coiling and wire drawing. A prepared high-entropy alloy coating has high low-temperature-resistant strength, high low-temperature hardness and high low-temperature ductility.

The invention discloses a ceramic channel used in a cryogenic liquid helium environment and a preparation method thereof. The method includes the following steps of mixing ceramic powder with an organic solvent to obtain a mixture, conducting cold isostatic pressing and high-temperature sintering on the mixture to obtain the ceramic channel, and connecting the ceramic channel and a metal connectorin a sealing mode. The ceramic powder is yttria-stabilized zirconia powder in which the molar percentage of yttria is 2 to 3%. According to the method, a zirconia ceramic material is used to replacecommon fiber and epoxy resin materials to make the liquid helium channel, so that the strength, toughness, corrosion resistance and radiation resistance of the channel are all significantly improved,and the service life is greatly prolonged. The shortcomings that the fiber and the epoxy resin materials are prone to ageing and lead to deterioration of airtightness are overcome, and the requirements of a full superconducting tokamak device for the liquid helium channel can be met.

The invention discloses an evanescent mode water-based paint for a large alloy steel casting. The evanescent mode water-based paint comprises the following components in parts by weight: 30 45 parts of quartz powder, 7 17 parts of zircon powder, 5 10 parts of talcum powder, 10 15 parts of bauxite, 15 parts of synthetic mullite, 2 4 parts of perlite particles, 4 6 parts of sodium bentonite, 2 4 parts of sodium carboxymethyl starch, 1 3 parts of cassava starch, 0.5-1.5 parts of refractory fiber, and 1 3 parts of mica powder. The evanescent mode water-based paint for the large alloy steel castingovercomes the casting defect that there air holes in the surface due to poor air permeability of the paint and improves the low-temperature strength, high-temperature strength and high-temperature air permeability of a coating, thereby enabling the large alloy steel casting to meet the requirements for mass production.

The invention discloses a lightweight high-strength refractory castable which comprises the following raw materials in percentage by weight: 25-35% of lightweight high-strength microporous alumina aggregate, 25-35% of alumina hollow spheres, 3-5% of floating beads, 5-8% of kyanite powder, 5-8% of calcined bauxite fine powder, 5-8% of silica powder, 6-9% of alpha-Al2O3 micro powder, 5-10% of alumina cement, 3-5% of refractory fibers, 0.1-0.3% of a composite water reducing agent and 0.02-0.05% of a water-based silicon polyether defoaming agent. The refractory castable can effectively reduce the water-cooling heat loss of a high-temperature water-cooling furnace roller of a thin slab continuous casting and rolling tunnel type heating furnace, improve the heat efficiency of the heating furnace and prolong the service life of a heat insulation layer of the furnace roller, and has the characteristics of stable performance, light volume weight, good mechanical property and excellent heat insulation performance and thermal shock resistance stability.

The invention relates to a formula of a micro-silicon powder pellet adhesive. A novel high-temperature adhesive is obtained by adding starch, lignin, polyacrylamide, a silane coupling agent, sodium silicate and sodium hydroxide according to a certain proportion. The novel high-temperature binder, broken silica and water are added into micro-silicon powder according to a certain proportion, uniformly mixed, pressed and formed in ball pressing equipment, dried and then measured in low-temperature and high-temperature strength. According to the binder disclosed by the invention, the low-temperature strength and the high-temperature strength of the micro-silicon powder pellets are improved, and the micro-silicon powder pellets are used as industrial silicon raw materials, so that the silicon recovery rate can be improved, and the production cost is reduced.

The invention discloses a method for local remelting reinforcement of an aluminum alloy part. The method comprises the following steps that a, two kinds of powder, namely pre-feeding powder and alloy powder added with alloy elements is prepared; and b, the aluminum alloy part is subjected to laser remelting, specifically, b1, the pre-feeding powder is conveyed to the position, needing to be remelted, of the aluminum alloy part, and a covering layer is formed; and b2, an annular laser beam is adopted for laser heating, an alloy powder pipe is arranged in the center of the annular laser beam, the annular laser beam is focused in the remelting area for heating, after a molten pool is formed, in-light powder feeding is carried out through the alloy powder pipe, alloy powder is fed into the molten pool, alloy elements in the alloy powder are rapidly fused into molten liquid of the molten pool, and a remelting part is obtained. According to the method for local remelting reinforcement of the aluminum alloy part, powder is fed in laser light, and reinforcing elements such as iron, chromium, copper and nickel in the alloy powder are molten into a remelting area, so that the strength, especially the high-temperature strength, of the remelting part is greatly improved.