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1629results about How to "Improve high temperature strength" patented technology

Rare earth-containing high strength heat resisting magnesium alloy and preparation thereof

The invention relates to a high strength heat-resistant magnesium alloy containing rare earths of the technical field of metallic materials and a preparation method thereof. The magnesium alloy comprises the following components according to the mass percent: Y with more than or equal to 3% and less than or equal to 16%, Gd with more than or equal to 0% and less than or equal to 10%, Ca with more than or equal to 0.3% and less than or equal to 5%, Zr with more than or equal to 0.1% and less than or equal to 1.5%, and one or a plurality of Nd, Si, Sb, Ti, Sn, Sr, Bi, Cd, Nd with more than or equal to 0% and less than or equal to 5%, Si with more than or equal to 0% and less than or equal to 5%, Sb with more than or equal to 0% and less than or equal to 5%, Ti with more than or equal to 0% and less than or equal to 5%, Sn with more than or equal to 0% and less than or equal to 5%, Sr with more than or equal to 0% and less than or equal to 5%, Bi with more than or equal to 0% and less than or equal to 5%, Cd with with more than or equal to 0% and less than or equal to 5%, and the rest is Mg and impurities. The magnesium alloy is obtained by using melting and the subsequent heat treatment. The magnesium alloy not only can serve as casting magnesium alloy but also can serve as the deformation magnesium alloy and has better predominant mechanical property compared with the WE series commercial magnesium alloy.
Owner:SHANGHAI JIAO TONG UNIV

Aluminum-carbon sliding tile and method of producing the same

The invention provides an aluminum-carbon sliding brick, which comprises the following compositions: 60 to 75 percent of aggregate, 15 to 30 percent of powder, 1 to 6 percent of carbon element materials, 2 to 7 percent of antioxidant and 3 to 20 percent of additive. The production method for the aluminum-carbon sliding brick comprises the following steps: firstly, the powder in the raw materials is premixed and prepared into mixed powder for standby; secondly, mixing is performed according to the feeding order of granular materials, a binder and the mixed powder; thirdly, the mixture is discharged and subjected to mechanical pressing; and fourthly, a green brick is dried and prepared into the aluminum-carbon sliding plate brick by an unfired technology or a light burning technology. The method adds nitride and spinel materials in the sliding brick to substantially improve the thermal shock stability of the sliding brick, so as to achieve the level of the aluminum-zirconium-carbon sliding brick; and because the addition of Al metals is adequately increased, air holes can be filled, and the method reduces the brittleness of materials, is favorable for green brick formation, and improves the volume density, the normal temperature strength and the high temperature strength, so as to improve the oxidation resistance of the sliding brick. The aluminum-carbon sliding brick produced by the method not only has good product quality and high strength but also has simple procedure and saves the sintering cost.
Owner:鞍山钢铁集团耐火材料有限公司

Copper and stainless steel dissimilar metal water adapter vacuum brazing technology method

The invention discloses a vacuum brazing technology method between copper and stainless steel dissimilar metal water connector, comprising processing each part of the water connectior, controling the processing precision and component assembly clearance; washing the part of water connectior; assembling water connections and putting in special fixture. Put the fixture in vacuum brazing furnace and carry out braze welding according to the following brazing technology: 1) take 35 minutes to make the furnace temperature to rise to 650 DEG C at a uniform speed; 2) continue to preserve heat for 20 minutes; 3) rise the furnace temperature at a uniform speed to 890 DEG C in 20minutes; 4) continue to preserve the heat for 20 minutes; 5) then rise the furnace temperature to 970 DEG C+-10 DEG C at a uniform speed in 15 minutes; 6) Continue to preserve heat for 5 minutes; 7) then stop heating and cool naturally; 8) on the next day take out the water connector from the fixture; 9) carry out the acceptance test by using the ultrasonic automatic testing device. The technical problem that the annular gap of the water connector is not fully filled and can be corroded is solved; the invention has the advantages of reliable method and high production efficiency, and can effectively improve the qualified rate of the products.
Owner:NUCLEAR POWER INSTITUTE OF CHINA

A Ni-Co-Cr-Al-W-Ta-Mo based high-entropy high-temperature alloy and a preparation method thereof

A Ni-Co-Cr-Al-W-Ta-Mo based high-entropy high-temperature alloy and a preparation method thereof are disclosed and belong to the field of high-entropy alloys. The chemical composition of the alloy isNiCoCr<c>Al<d>W<e>Ta<f>Mo<g>Rx, wherein R is one or two of Re and Ru. The method includes removing surface oxide skin of raw material metals by utilizing a mechanical-chemical combined process;cleaning the raw material metals by utilizing industrial ethanol and utilizing ultrasonic shaking; smelting the alloy by using a vacuum arc furnace; charging industrial argon when the vacuum degree is5*10<-2> Pa; after a master alloy is uniformly melted, injecting the alloy into a water cooling copper mould by utilizing a vacuum casting or suction casting device to obtain a high-entropy alloy rod; performing solution treatment at 1250 DEG C for 2-6 h; and then performing ageing heat treatment at 900 DEG C and 950 DEG C for 4-50 h. The disclosed alloy has excellent room-temperature and high-temperature strength, excellent resistance to high-temperature oxidation, and excellent creeping resistance, fatigue resistance and long-term tissue stability, is suitable for manufacturing hot end elements, such as blades and turbine discs, of aero-engines and gas turbines, and is used for engineering machines, special vehicles, coal, ore, railroads, and the like.
Owner:UNIV OF SCI & TECH BEIJING

TiAl alloy and preparation method thereof

The invention belongs to the field of TiAl intermetallic compounds, and relates to forging TiAl alloy which is mainly applied to manufacturing of aero-engine blades, can be used for a long time at thetemperature being 700-800 DEG C, and is high in plasticity, high in strength, high-temperature-resistant and fatigue-resistant and a preparation method of the forging TiAl alloy. The TiAl alloy is added with beta stable elements such as Cr, Nb, Ta, W and Mo, and is further added with a small amount of interstitial elements such as B and Si. The forging TiAl alloy is characterized in that the TiAlalloy comprises the following components in percentages by atoms: 42-47% of Al, 3-6% of Nb, 1-2% of Cr, 0.1-0.5% of Ta, 0-0.2% of W, 0-0.2% of Mo, 0-0.2% of B, 0-0.2% of Si and the balance of Ti andinevitable impurities, wherein O content is less than or equal to 0.1 wt%, N content is less than or equal to 0.015 wt%, H content is less than or equal to 0.01 wt%, and Fe content is less than or equal to 0.08 wt%. After the various beta stable elements are combined and matched, the total adding amount is calculated according to a [Nb] equivalent formula and requires to be controlled between 6 and 11. The TiAl alloy can work at the temperature being 700-800 DEG C for a long time, can be used for manufacturing parts such as aero-engine compressor blades and low-pressure turbine blades, can also be used for manufacturing high-temperature-resistant structures such as supersonic aircrafts, and can be used for a short time at the temperature being 900-1000 DEG C.
Owner:AVIC BEIJING INST OF AERONAUTICAL MATERIALS

Preparation method of titanium carbide-based cermet powder material for thermal spraying

The invention provides a preparation method of a titanium carbide-based cermet powder material for thermal spraying, which belongs to the field of powder materials for thermal spraying. The method comprises the following steps of: firstly, weighting titanium powder, graphite powder/soot carbon, and other metal components in a proportion to prepare raw material powder; putting the raw material powder into a ball mill pot for ball milling, briquetting the mixture to form a block after the mixing is finished, placing in a self-propagating high-temperature synthesis reactor, igniting the block after the air in the reactor is removed so that the whole block is ignited to undergo a self-propagating reaction; starting a mechanical pump to vacuumize after the reaction is finished, and cooling reaction products to room temperature with the reactor so as to obtain a loose porous titanium carbide-based cermet block; and finally, after the cermet block is taken out, removing contaminants on the surface of the cermet block, and then crushing and screening residual products to obtain titanium carbide-based cermet powder for thermal spraying in different grain sizes. The preparation method in the invention has the characteristics of short synthesis time, energy saving, environmental protection, low price, and the like, and is suitable for industrial production.
Owner:UNIV OF SCI & TECH BEIJING

Light-weight corundum-magnesia alumina spinel refractory material and a preparation method of same

The invention relates to a light-weight corundum-magnesia alumina spinel refractory material and a preparation method of same, wherein porous corundum-magnesia alumina spinel ceramic material granules are used as an aggregate, wherein ceramic material being 3-5 mm in granular size accounts for 10-18 wt%, ceramic material being 1-2.8 mm in granular size accounts for 25-30 wt%, and ceramic material being 0.1-0.8 mm in granular size accounts for 15-20 wt%; a substrate includes 12-18 wt% of porous corundum-magnesia alumina spinel ceramic material fine powder with nano-scale pore diameter, 12-20 wt% of corundum fine powder, 2-5 wt% of magnesite fine powder and 3-8 wt% of alpha-Al2O3 micropowder. The preparation method includes the steps of: 1) placing the aggregate in a vacuum stirrer, vacuumizing the stirrer, and adding a magnesium chloride solution which accounts for 3-8 wt% of the total weight of the aggregate and the substrate, stirring the mixture, and turning off the vacuumizing system; 2) adding the substrate, stirring the materials, shaping and drying the materials, and performing temperature maintenance at 1450-1650 DEG C, cooling the material to produce the refractory material. In the refractory material, diameters of pores are nano-scale, so that the refractory material is low in heat conductivity and high in strength, has high anti-medium erosion performance and excellent thermal shock resistance.
Owner:WUHAN UNIV OF SCI & TECH
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