1637results about How to "Improve high temperature strength" patented technology

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.

The invention discloses a new high-resistance electrical heating alloy material and a preparation method thereof. The material comprises the following components by weight percent: 0.01-0.06% of C, 1.0-1.5% of Si, 0.1-0.6% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 20-23% of Cr, 74.0-78.0% of Ni, 0.1-0.25% of Al, 0.2-1.0% of Fe, 0.01-0.2% of Ti, 0.2-0.8% of Zr and the balance of inevitable impurities. The preparation method comprises the steps of smelting, forging, wiring, annealing, rinsing, drawing and the like. Compared with Cr20Ni80, the prepared new high-resistance electrical heating alloy material has better oxidation resistance and is an electrical heating alloy material with low thermal expansion coefficient, good high temperature strength, long service life and high resistivity.

The invention discloses a quickly vitrified fireproof cable material and a preparation method thereof. According to the weight parts, the raw material of the ceramic fireproof cable material comprises 60-70 of ethane-vinyl acetate copolymer, 30-40 of polyethylene, 50-100 of ceramic filler, 0.5-2.5 of coupling agent, 80-100 of flame retardant A, 10-20 of flame retardant B, 1-2 of lubricant and 1-3 of antioxidant. The preparation process of the cable material comprises the steps as follows: surface disposing of the ceramic filler, compounding, mixing, granulating, drying and the like. The fireproof cable material is polymer-based composite material and has the same behaviors (namely excellent processability and convenient construction) with normal extrusion cable insulation material under normal environment, and can be vitrified within 10 minutes under the temperature of 750 DEG C or higher; the ceramics can ensure that the normal running time of the line under the temperature of 750-950 DEG C for more than 90min.

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.

The invention relates to a magnesium-zirconium brick with high erosion resistance and thermal shock resistance for an RH furnace and a production technology thereof. The brick comprises the following components by weight percent: 76-90% of MgO and 5-21% of ZrO2; and the firing temperature of the brick is 1680-1840 DEG C. The production technology comprises the following steps: pretreating magnesia and zirconia, synthesizing the magnesia and zirconia into magnesium-zirconium sand; crushing synthesized magnesium-zirconium sand and fused magnesia to 5-3mm, 3-1mm and 1-0mm particles; homogenizing under strong force and mixing the granular materials, 150-200 mesh magnesia and magnesium-zirconium sand powder, 200-250 mesh zirconia powder, additives CaO and Y2O3 and binder paper pulp water liquid and performing compression moulding; baking at 120 DEG C for 24-72 hours; and heating to 1680-1840 DEG C and maintaining the temperature for 3-5 hours. The linear change of the finished brick is within the range of + / -0.5%; and after being baked, the brick has no surface chap defect caused by the phase change of zirconia and has excellent refinery cinder erosion resistance and thermal shock resistance.

The invention discloses a high-resistance electrothermal alloy material, which comprises the following components in percentage by weight: 0.02 to 0.08 percent of C, 0.75 to 1.6 percent of Si, 0.1 to 0.5 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, 20 to 23 percent of Cr, 0.1 to 0.5 percent of Al, 0.2 to 0.8 percent of Y, 0.2 to 1.0 percent of Fe, and the balance of Ni and inevitable impurities. The preparation method for the high-resistance electrothermal alloy material comprises the following steps of: smelting; forging; coiling; annealing; rinsing; mold drawing, and the like. Compared with Cr20Ni80, the high-resistance electrothermal alloy material has higher antioxidation performance, and is an electrothermal alloy material with small thermal expansion coefficient, high high-temperature strength and processability, long service life and high resistivity.

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.

The invention relates to an organic silicon modified epoxy resin coating and a preparation method thereof. The coating consists of a coating main agent A component and a curing agent B component, wherein a coating main agent consists of substrate resin, a pigment-filler, a solvent and an aid; the substrate resin is obtained by modifying epoxy resin E-20 by using a methyl phenyl organic silicon low polymer; the using amount of the substrate resin accounts for 50-55 percent of the weight of the coating main agent; the weight ratio of the methyl phenyl organic silicon low polymer to the epoxy resin E-20 is (11-20):(15-16); the curing agent is polyamide; and the weight ratio of the coating main agent to the curing agent is 100:(7-12). The method comprises the following steps of: undergoing a condensation copolymerization reaction on hydroxyl, amino and alkoxyl in organic silicon resin with hydroxyl in epoxy resin; and grafting organic silicon -Si-O-group into the epoxy resin to obtain the modified epoxy heat-resistant coating with high heat resistance, high corrosion resistance and high paint film property.

The invention provides a process for the production of a composite structural part which can withstand high thermal stress, consisting of at least one graphite part and at least one metal part made of a hardenable copper alloy. In accordance with the invention, the metal part is bonded, by a hot isostatic press process, with the graphite part, which has a layer made of copper or a copper alloy on the bonding surface. In this way, it is possible to use copper-chromium-zirconium alloys with more complex composite structural part constructions and with thin-wall parts of the metal component, without the good mechanical characteristics of the copper-chromium-zirconium alloy being destroyed.

The invention provides a method for preparing a nanoscale silicon carbide copper alloy material. A nano silicon carbide copper alloy material which is 5-10% of total volume is evenly distributed in a copper alloy material; and the performance of the alloy material is further promoted by utilizing high hardness, high abrasive resistance, good self-lubricating property and high-temperature and high-strength performance of the nano silicon carbide. The invention also provides the nanoscale silicon carbide copper alloy material prepared by the method for preparing the nanoscale silicon carbide copper alloy material. The nanoscale silicon carbide copper alloy material comprises the following components in percentage by total volume: 5-10% of nanoscale silicon carbide (SiC) and 90-95% of copper alloy material ZQAL9-4. The novel nano alloy material prepared by the preparation method has high strength, hardness, abrasive resistance and corrosion resistance. Thus, the service life of an aerospace high-strength pressure product, wear part products of petroleum engineering equipment, and anticorrosion product parts of marine engineering equipment is prolonged.

Disclosed is a hollow cast ceramic core, which comprises substrate material 80-85% and Mullite 20-15%, wherein the substrate material comprises quartz glass powder 60-80% and silica dioxide porous material 40-20%. Its manufacturing process consists of proportioning, mixing the core material with plasticity agent and right amount of oleinic acid, melting, mixing, press forming, sintering, and carrying out high temperature reinforcement and low temperature reinforcement treatment.

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.

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.

The invention discloses neodymium iron boron magnetic materials and a preparation method of the neodymium iron boron magnetic materials. The neodymium iron boron magnetic materials comprise, by weight, 27-34.5 % of neodymium (Nd), 4.5-5.75 % of praseodymium (Pr), 0.45-0.575 of gadolinium (Gd), 2-4% of boron (B), 0.08-0.16 % of niobium (Nb), 0.01-0.02 % of hafnium (Hf), 0.01-0.02 % of wolfram (W) and 0.045-0.0575 % of scandium (Sc), and the rest is ferrum (Fe). The neodymium iron boron magnetic materials have uniform textures and strong structures, and can not only improve tenacity performance of the materials but also improve magnetic performance to some extent. The preparation method of the neodymium iron boron magnetic materials fully utilizes praseodymium-neodymium waste materials to directly produce raw materials for alloy, is flexible in composition proportion, qualified in quality control, capable of reducing cost and simple in technology, and fully utilizes waste powder materials with high oxygen content.

The present invention relates to a minicar engine cylinder cap low-pressure casting aluminium alloy, and its main chemical components are Si, Cu and Mg, in particular Cu and Mg control is better, and its harmful impurity element control is serious, and after said alloy is undergone the processes of modification treatment by means of modification agent and (T6) heat treatment, its tensile strength QbMPa is greater than or equal to 300, HB is about 110, and said alloy has enough strength and rigidity and good size stability, and said alloy can meet the requirements for miniature car engine cylinder cap low-pressure casting process and mechanical working process.

A surface-coated cutting tool which has excellent chipping resistance and wearing resistance in high-speed cutting processing such as high-speed gear cutting processing, high-speed milling processing,and high-speed drilling processing. The surface-coated cutting tool comprises a tool base, e.g., a cemented carbide base, cermet base, or high-speed tool steel base, and at least a hard coating layerformed on a surface of the tool base and having a multilayer structure composed of a thin layer (A) and a thin layer (B) alternating therewith. The thin layer (A) is constituted of an (Al,Cr,Si)N layer satisfying the empirical formula ¢AlXCrYSiZ!N (wherein 0.2 <= X <= 0.45, 0.4 <= Y <= 0.75, 0.01 <=Z <= 0.2, and X+Y+Z=1 in terms of atomic ratio), and the thin layer (B) is constituted of an (Al,Ti,Si)N layer satisfying the empirical formula ¢AlUTiVSiW!N (wherein 0.05 <= U <= 0.75, 0.15 <= V <= 0.94, 0.01 <= W <= 0.1, and U+V+W=1 in terms of atomic ratio).

The invention relates to a high-performance magnesium-aluminum-chromium composite spinel brick for RH refining furnace dip pipes and non-ferrous smelting furnaces. The high-performance magnesium-aluminum-chromium composite spinel brick is characterized by comprising the following raw materials: 14.0-20.0 parts of low-chromium fused magnesium chromium sand (6-8% of Cr2O3, at least 78% of MgO), 71.6-82.0 parts of high-purity fused magnesite, 2.0-4.4 parts of nano Cr2O3 powder, 2.0-4.0 parts of uf-Al2O3 micropowder and 2-4 parts of binder. The manufacturing method comprises the following steps: mixing, molding, drying, firing and the like. The magnesium-aluminum-chromium composite spinel brick provided by the invention has the advantages of high sintering tendency, high crystal compactness, low porosity (at most 10%), high compressive strength (at least 100 MPa), high thermal shock stability (at least 18 times by 1100 DEG C water cooling) and the like. The Cr2O3 content of the product isat most 6%, thereby reducing the Cr2O3 content in the brick, lowering the production cost and finally effectively reducing the environmental pollution of waste magnesium-chromium bricks after use.

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.

A steam turbine comprising a rotor shaft integrating high and low pressure portions provided with blades at the final stage thereof having a length not less than 30 inches, wherein a steam temperature at first stage blades is 530° C., a ratio (L / D) of a length (L) defined between bearings of the rotor shaft to a diameter (D) measured between the terminal ends of final stage blades is 1.4 to 2.3. This rotor shaft is composed of heat resisting steel containing by weight 0.15 to 0.4% C, not more than 0.1% Si, 0.05 to 0.25% Mn, 1.5 to 2.5% Ni, 0.8 to 2.5% Cr, 0.8 to 2.5% Mo and 0.15 to 0.35% V and, further, the heat resisting steel may contain at least one of Nb, Ta, W, Ti, Al, Zr, B, Ca, and rare earth elements.

The invention provides a coarse-grained hard alloy and a preparation method of the coarse-grained hard alloy, which mainly includes WC, Co accounting for 8.0 to 11.5 weight percent and TaC accounting for 0.4 to 0.6 weight percent; the average grain size of the WC in the coarse-grained hard alloy is 3.2 to 4.0Mu m, and the bending resistance strength is 2600 to 3100 MPa and the hardness Hv30 is 1100 to 1320. The preparation materials adopt the coarse-grained WC powder close to single crystal, with Fsss size 11.0 to 15.0Mu m and Hcp value 4.50 to 5.38 KA / m, TaC powder and Co powder; the vacuum sintering temperature is 1450 to 1520 DEG C, the ratio of TaC to Co is equal to to 0.045 to 0.055. The invention well matches the alloy strength and micro-harness, improves the over-all performance, thermal shock resistance and thermal plastic deformation resistance of the coarse-grained hard alloy.

The invention discloses a high-end packaging silver alloy bonding wire. The high-end packaging silver alloy bonding wire is characterized by comprising 0.0001%-20% of gold, optional one or more than one of 0.0001%-20% of palladium, 0.0001%-20% of platinum, 0.0001%-0.015% of germanium, 0.0001%-0.015% of calcium and 0.0001%-1% of aluminum, and the balance silver. The invention further discloses a method for manufacturing the high-end packaging silver alloy bonding wire. The high-end packaging silver alloy bonding wire has the advantages of high strength and low hardness and long-arc degree.

The invention discloses a rare earth-contained heat-resistant magnesium alloy and a preparation method thereof, belongs to the technical field of magnesium alloy preparation. The heat-resistant magnesium alloy disclosed by the invention comprises the following materials by weight: 2 to 8 percent of Sm, 0.5 to 6 percent of Gd, 0.1 to 2 percent of Zn, 0.1 to 1.5 percent of Zr, and Mg and inevitable impurity elements in balancing amount, wherein the total weight of the impurity elements is equal to or smaller than 0.02 percent. By adding ally elements (Sm, Gd and Zn) to replace Y and Nd of WE series alloies, and adjusting corresponding heat treatment processes to ensure that the prepared magnesium alloy has excellent indoor temperature intensity, high-temperature strength and plasticity, the indoor temperature intensity, high-temperature strength and plasticity of the magnesium alloy prepared according to the preparation method are more excellent than those of the conventional WE series commercial magnesium alloies; the preparation method of the magnesium alloy prepared according to the preparation method is lower than that of the conventional WE series commercial magnesium alloies. The process is simple; industrialized application is facilitated.

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.

Disclosed are high low-temperature impact toughness thick steel plates for hydrogen-contacting equipment and a production method thereof. The production method includes the steps: firstly, smelting and casting; secondly, heating plate blanks at 1070-1210 DEG C and rolling the plate blanks according to a compression ratio of 2.7-6.4; thirdly, normalizing within an austenitization temperature range; fourthly, accelerated cooling with water for 4-15 minutes; and fifthly, tempering at 700-750 DEG C; and sixthly cooling, wherein the steel plates comprise, in weight percentage, 0.10-0.15% of C, 0.50-0.60% of Si, 0.40-0.60% of Mn, not more than 0.010% of P, not more than 0.003% of S, 1.25-1.50% of Cr, 0.45-0.65% of Mo, 0.08-0.18% of Cu, 0.07-0.17% of Ni, 0.020-0.045% of Al, not more than 0.003% of Sn, not more than 0.003% of Sb, not more than 0.003% of As, 0.0020-0.0070% of N, the balance of Fe and unavoidable impurities, low-pressure section water flow of a pressure quenching machine is 18-38m<3> / min, top-to-bottom water volume ratio of each steel plate is 1:1.0-1.3, and the surface temperature of the steel palate at an outlet of the pressure quenching machine is not more than 120 DEG C.

The invention relates to the technical field of powder metallurgy and particularly relates to a ceramic part and a production method thereof. The production method comprises (1) mixing granulation: putting ceramic powder into a mixer, heating the ceramic powder, adding a binder into the ceramic powder, carrying out mixing, and carrying out granulation through an extruder to obtain feed, (2) injection molding: placing the feed in an injection molding machine and carrying out injection molding to obtain an injected blank, (3) degreasing: placing the injected blank into an air furnace, carrying out hot degreasing, carrying out heating pre-sintering, carrying out furnace cooling and taking out a blank, and (4) sintering: putting the blank in a sintering furnace, carrying out sintering, and carrying out grinding and polishing to obtain a ceramic part. Through powder injection molding process and final degreasing and high temperature sintering, a fine ceramic part having a complex shape is obtained, the product has high compactness and good uniformity and is obtained by one step molding, the operation and control are simple, product quality is stable, production efficiency is high, a production cost is low and large-scale industrial production is realized.

The invention relates to a dry vibration material of environmental protection type and a preparation method thereof; the invention is characterized in that vibration material of intermediate dry type is grain composition formed by manually cleaning and crushing waste magnesia-carbon bricks, waste aluminium-magnesia carbon or the mixture thereof in steelmaking plants. Inorganic silicate is selected as adhesive; metal Al powders, Si powders and SiC powders are added as compound anti-oxidant; borax and silicon powders are selected as medium-temperature agglutinant. The dry vibration material prepared banishes the conventional phenolic resin as adhesive, and meets the requirement of environmental protection. The service life is expanded from 12 hours to over 20 hours; the invention is vibration material of intermediate dry type with strong practicality, easy preparation and rich material.