98results about How to "Dense grain" patented technology

The invention discloses a high-plasticity cast aluminum alloy and an extrusion casting preparation method thereof, belonging to the technical fields of metal materials and metallurgy. The alloy comprises the following components in percentage by weight: 7.5-13.5% of Si, 0.5-0.8% of Mg, 0.2-0.5% of Mn, 0.1-0.4% of Ti, 0.01-1.5% of RE, 0.6-1.3% of Fe, at most 100 ppm of P, 100-600 ppm of Sr and the balance of Al. The RE is one or more of Gd, Y, Nd, Sm, Er, Yb and La. After the high-plasticity cast aluminum alloy is subjected to extrusion casting and solid solution+artificial aging treatment, the elongation percentage delta of the alloy is greater than or equal to 22%. The alloy has the advantages of excellent casting performance and low cost. The method has the advantages of simple technique, high production efficiency and obvious progress, and widens the application range of the Al-Si cast aluminum alloy.

The invention discloses a high-plasticity cast aluminum alloy and a gravity casting preparation method thereof, and belongs to the fields of metal materials and metallurgy. The high-plasticity cast aluminum alloy is prepared from the following components in percentage by weight: 7.5 to 13.5% of Si, 0.5 to 0.8% of Mg, 0.2 to 0.5% of Mn, 0.1 to 0.4% of Ti, 0.01 to 1% of RE, not greater than 0.4% of Fe, not greater than 100ppm of P, 100 to 600ppm of Sr, and the balance of Al, wherein RE is one or some of Gd, Y, Nd, Sm, Er, Yb and La. After gravity casting, solid solution treatment and artificial aging treatment, the high-plasticity cast aluminum alloy has the elongation delta of being not less than 18%. The prepared alloy is outstanding in casting performance, low in cost, simple in process, high in production efficiency, and obvious in progress, and the applicable scope of Al-Si cast aluminum alloy is expanded.

A dissimilar steel welding method for martensite heat-resisting steel and austenitic heat-resisting steel includes the following steps that (1) according to technical requirements of a friction welding machine, a martensite heat-resisting steel tube and an austenitic heat-resisting steel tube are respectively installed and clamped through a fixture of the friction welding machine and cannot shake, and the center line of the martensite heat-resisting steel tube and the center line of the austenitic heat-resisting steel tube are kept in the same horizontal line; (2) at a first-level pressurization stage, the rotation speed is 1200-1800 revolutions per minute, friction pressure is 25-75 MPa, and friction time is 4-6 seconds; (3) at a second-level pressurization stage, the rotation speed is 1200-1800 revolutions per minute, friction pressure is 100-200 MPa, and friction deformation is 4-8 mm; (4) at an upset forging stage, upset forging pressure is 150-250 MPa, and upset forging time is 4-6 seconds; (5) partial heat treatment needs to be carried out on a welded joint between the martensite heat-resisting steel tube and the austenitic heat-resisting steel tube after welding, so that residual stress is eliminated. The method has the advantages that quality of the joints is high, the method is suitable for welding of heterogeneous materials, production efficiency is high, production cost is low, energy is saved, and environment is protected.

The invention relates to the technical field of metal surface hardening treatment and in particular relates to high-hardness cobalt-based alloy powder for laser cladding and a preparation technology of the high-hardness cobalt-based alloy powder for laser cladding. According to the technical scheme, the high-hardness cobalt-based alloy powder for the laser cladding is prepared from the following components in percentage by weight: 1.2-1.55% of C, 28-31% of Cr, less than or equal to 3% of Fe, less than or equal to 0.5% of Mn, less than or equal to 1% of Mo, less than or equal to 3% of Ni, 0.7-1.5% of Si, 3.5-6.5% of W and the balance of Co. The preparation technology of the high-hardness cobalt-based alloy powder for the laser cladding comprises the following steps: a, preparing the components, and smelting; b, slagging and deoxidizing the smelted components obtained in the step a; c, preparing the components obtained in the step b into powder; d, collecting the powdery components obtained in the step c; and e, sieving the cooled powdery components obtained in the step d. By adopting the technical scheme, the high-hardness cobalt-based alloy powder, which hardly cracks, is hardly oxidized, is extremely low in porosity, has good self fluxing performance, is used for the laser cladding, and a preparation technology of the high-hardness cobalt-based alloy powder are provided.

A dissimilar metal welding method for martensite heat-resisting steel and high-temperature nickel base alloy includes the following steps that (1) according to technical requirements of a friction welding machine, a martensite heat-resisting steel tube and a high-temperature nickel base alloy tube are respectively installed and clamped through a fixture of the friction welding machine and cannot shake, and the center line of the martensite heat-resisting steel tube and the center line of the high-temperature nickel base alloy tube are kept in the same horizontal line; (2) at a first-level pressurization stage, the rotation speed is 1200-1500 revolutions per minute, friction pressure is 20-50 MPa, and friction time is 1-3 seconds; (3) at a second-level pressurization stage, the rotation speed is 1200-1500 revolutions per minute, friction pressure is 50-100 MPa, friction deformation is 1-4 mm, and friction time is shorter than 10 seconds; (4) at an upset forging stage, upset forging pressure is 100-200 MPa, and upset forging time is 2-4 seconds; (5) partial heat treatment needs to be carried out on a welded joint between the martensite heat-resisting steel tube and the high-temperature nickel base alloy tube after welding, so that residual stress is eliminated. The method has the advantages that quality of the joints is high, the method is suitable for welding of heterogeneous materials, production efficiency is high production cost is low, energy is saved, and environment is protected.

This invention discloses an anti-rust phosphor solution formula of a metal and its technology method, the formula is composed of the following materials: XMn(H2PO4)2íñYfe(H2PO4).4H2O is 20-100g/lú¼Mn(NO3)2íñ6H2O is 20-100g/lú¼Zn(NO3)2íñ6H2O is 100-200g/lú¼Ni+2 is 0.5-10g/lú¼exterior active formula is 0.5-20g/l, water takes up 2/3 of the whole chemical, there also has some proper crap irons. The technology method as followsú‘Firsly, preparing solution by the formula; secondly, adjusting the acid proportion of the solution; thirdly, doing the pretreatment on the surface of the metal; fourthly, phosphating; fifthly, ost-treatment, oiling. The phosphor film crystal grain made in this invention is dense, symmetrical, the film is thin, the phosphor coating is symmetrical and dense, and the color is plentiful.

The invention discloses a hub extrusion forming method. A hub is produced and manufactured in a pre-forging and final forging two-step extrusion forming mode. In the pre-forging stage, a rim and an inner rim portion of the hub are extruded and formed through downward reverse extrusion motion of a pre-forging upper male die, and an outer rim and wheel arm parts of the hub are extruded and formed through the downward extruding motion of a final forging upper die in the final forging forming stage. The hub producing and manufacturing process by adopting the forming method is simple, the production efficiency is high, the forming pressure is smaller, the near-net forming material utilization rate is high, and the hub mechanical performance is more excellent.

The invention relates to a lamina wear-resisting phosphorization agent and a preparation method thereof. The phosphorization agent has the following components and contents: 45-50g/l of manganous salt, 1-2ml/l phosphoric acid, 2-4g/l of nickel nitrate, 2-10g/l of nitrate of lime, 0.5-2g/l of zinc nitrate, 3-5g/l of scrap iron, 1-3g/l of citric acid, moderate amount of manganese carbonate for adjusting free acidity and the balance of water; total acidity of the phosphorization stands at 45-50 points, free acidity stands at 6.5-7.5 points and the proportion of the total acidity to the free acidity is 6:1 to 7:11.When the phosphorization agent is prepared, 40-45g/l of manganous salt is weighed and placed in water of 70 DEG C to be dissolved; water is supplemented after the manganous salt is completely dissolved; then the mixed solution is heated to boiling state and then cooled to 70 DEG C before adding 3-5g/l of scrap iron for carrying out reaction for 30-45min; then 0.5-2.0ml/l of phosphoric acid is added; sampling analysis is carried out and acidity of the solution is adjusted; then 2-4g/l of nickel nitrate, 2-10g/l of nitrate of lime, 0.5-2g/l of zinc nitrate are added; sampling analysis is carried out and acidity of the solution is adjusted again; after testing is passed, 1-3g/l of citric acid is added to obtain the phosphorization agent.

The invention provides a fine-grained silver-based electrical contact material and a preparation method thereof. The method comprises the following steps of 1, carrying out smelting and insulating onmetal silver and copper or silver and nickel so as to obtain the molten metal; 2, rapidly cooling the molten metal into a blank so as to inhibiting the grain growth in the alloy structure; 3, pullingout the blank to form a wire; 4, carrying out heat treatment on the wire; 5, performing large-plastic deformation on the heat-treated wire to obtain the fine-grained silver-based electric contact material. According to the fine-grained silver-based electrical contact material and the preparation method thereof, the horizontal continuous casting and large-plastic deformation technologies are combined, the prepared silver-based electric contact material has the advantages of being fine in crystal grain, compact in structure and good in mechanical property, the electric performance is greatly improved, and the material can be widely applied to a self-control switch, a thermostat, a thermostat, a baking machine, a baking oven timer, a computer and the like.

The invention discloses fen-flavor liquor as well as a preparation method and device thereof and belongs to the technical field of liquor. The fen-flavor liquor comprises raw materials in parts by weight as follows: 40-50 parts of rice, 3-8 parts of sorghum, 3-8 parts of glutinous rice, 3-8 parts of maize, 3-8 parts of millet, 3-8 parts of sago, 3-8 parts of oat, 3-8 parts of chickpeas, 3-8 parts of lotus seeds, 3-8 parts of lily bulbs, 3-8 parts of buckwheat, 180-320 parts of mountain spring water and 0.2-1 part of distiller's yeast. The invention further discloses the preparation method and device of the fen-flavor liquor. The fen-flavor liquor is prepared from 11 kinds of grain as basic raw materials, is fully transparent, milk white, soft and fragrant, has effects of cooling and moisturizing the throat, clearing the lung, realizing sweet aftertaste for a long time and the like and cannot cause headaches if a person drinks too much of the liquor; besides, the preparation method and device are simple, have the broad market prospect and are suitable for large-scale production.

The invention relates to a method for preparing a spherical molecular sieve. The method comprises the steps: (1) preparation of small-particle nuclei: adding a molecular sieve fine powder raw material and water to a stirring granulator, and performing stirring and granulation so as to obtain the small-particle nuclei with a particle diameter of 0.5-2.0 mm; (2) preparation of molecular sieve spherical particles: adding the small-particle nuclei, the molecular sieve fine powder raw material and water to a coating granulator so as to form the molecular sieve spherical particles; and (3) preparation of the finished product: performing sieving, drying and calcination on the molecular sieve spherical particles so as to obtain the spherical molecular sieve product. Compared with the prior art, the method has the advantages of a high pelletization rate of nuclei, energy saving, environmental protection and a simple preparation process, and the molecular sieve particles are compact, and has a rounded appearance and smooth appearance.

The invention discloses a ternary precursor preparation system which comprises a blending system, a synthesis control system, an aging system, a washing filter pressing system and a drying system, wherein the blending system comprises a mixed salt preparing kettle and an additive solution preparation tank; the synthesis control system comprises a reaction kettle, an alkali storage tank and an ammonium hydroxide storage tank; the reaction kettle communicates with the mixed salt preparation kettle; the alkali storage tank communicates with the reaction kettle through the ammonium hydroxide storage tank; the aging system comprises an aging kettle; the aging kettle communicates with the reaction kettle and the additive solution preparation tank respectively; the aging kettle is internally provided with a stirring device; the aging kettle is further provided with a jacket; the washing filter pressing system comprises a filter press and a mother liquid transfer tank; the aging kettle communicates with the sealed filter press and the mother liquid transfer tank respectively; and the drying system comprises a hot air circulation baking oven for drying a washed and filtered product. By adopting the system, precursor granules which are dense in granule, good in sphericity and narrow in particle size distribution can be prepared.

The invention relates to a method for promoting the granulation of flocculent activated sludge by applying nano magnet. The method comprises the following steps: mixing the flocculent activated sludge, the nano magnet and sewage; promoting the granulation of the flocculent activated sludge by interaction between the nanodots and the flocculent activated sludge; performing the granulation process at room temperature according to a cycle, and sufficiently aerating within each cycle. According to the method disclosed by the invention, the granulation process of the activated sludge can be effectively shortened; by adding a small amount of the nano magnet, the granulation time of the sludge can be effectively shortened and the cost is low; in addition, obtained particles are denser and better in stability. The method disclosed by the invention has the advantages of simple process, mild reaction conditions, safety and no toxicity to environment and facilitation for engineering application; the method can be performed at normal temperature and normal pressure.

The invention relates to the technical field of additive manufacturing, in particular to novel martensitic heat-resistant steel and a method for manufacturing a thin-walled elbow of a seamless steel pipe. The novel martensitic heat-resistant steel comprises the compositions of, by weight, 0.05-0.15% of carbon, 0.1-0.4% of silicon, 0.3-0.6% of manganese, 8.0-12.0% of chromium, 1.5-1.9% of tungsten,0.1-0.8% of molybdenum, 0.1-0.3% of vanadium, 0.1-0.3% of tantalum, 0.05-0.3% of lanthanum hexaboride and the balance iron. The thin-walled elbow of the seamless steel pipe prepared by the novel martensitic heat-resistant steel by adopting laser-CMT composite additive manufacturing is compact in structure, the alloy structure comprises lath martensite and dispersed carbide, crystal grains are fine and uniform, and no columnar crystal texture is generated; and due to the addition of LaB6 to the novel martensitic heat-resistant steel, the LaB6 reacts with O to form LaBO3, and then the LaBO3 decomposes into La2O3 and B2O3 which can be used for deoxidation and slag formation of a micro-melting bath in the additive manufacturing process, the formability and manufacturability are improved, theforming structure is improved, and the mechanical properties of formed parts are improved.

The invention discloses a coating solution of a coating electrode and a preparation method of the coating electrode. The coating solution is a solution composed of chloro-iridic acid, tantalum pentachloride, alpha-hydroxy acid, glycol and n-butyl alcohol, the volume ratio of the glycol to the n-butyl alcohol is 1 to 1, the concentration of the chloro-iridic acid is 30-38 g/L, and the mass percentof the chloro-iridic acid to the tantalum pentachloride to the alpha-hydroxy acid is 55-62 to 34-40 to 3-7. The preparation method of the coating electrode comprises the steps that a titanium plate isput into a sodium carbonate solution to be boiled, washed thoroughly with deionized water and dried; the titanium plate is put into an oxalic acid solution to be boiled, taken out to be washed thoroughly and dried; and a brush is used for coating the titanium plate with the coating solution, drying and hot air oxidation are carried out, after cooling, the processes are carried out repeatedly, after heat treatment, the coating solution is cooled to the normal temperature, and the coating electrode is prepared. The coating surface of the coating electrode prepared from the coating solution through the preparation method has no obvious cracks, the area of a plane region is large, the plane region is smooth, most crystal grains grow on the plane region, the coating is compact in bonding, thefortified life is obviously prolonged, and the performance is remarkably improved.

The invention discloses a lithium-cerium-tantalum codoping niobic acid-bismuth-calcium based piezoceramic material and a preparation method thereof. The lithium-cerium-tantalum codoping niobic acid-bismuth-calcium based piezoceramic material is characterized by being expressed by a general formula Ca1-x(Li,Ce)x/2Bi2Nb2-yTayO9, wherein x is greater than or equal to 0.02 and is less than or equal to 0.15, y is greater than or equal to 0.01 and is less than or equal to 0.3, x expresses the molar fractions of lithium and cerium on the site A, and y expresses the molar fraction of tantalum on the site B. The preparation method of the piezoceramic material comprises the following steps: preparing a niobic acid-bismuth-calcium (CNB) ceramic powder material by adopting a solid phase method, wherein the doping amounts of the lithium and cerium (Li, Ce) on the site A and the tantalum (Ta) on the site B in the niobic acid-bismuth-calcium (CNB) ceramic powder material are different; and then preparing the lithium-cerium-tantalum codoping CBN based piezoceramic material by pelleting, tabletting, discharging rubber, sintering, silvering and polarizing. The results show that the crystal particles of the lithium-cerium-tantalum codoping CBN based piezoceramic material obtained by preparation at a relatively low sintering temperature of 1100 DEG C are relatively compact and uniform, the sintering activity and compactness of ceramics are improved, and the sintering effect is relatively good; the piezoceramic performance of the piezoceramic material is greatly improved, and the dielectric loss of the piezoceramic material is reduced.

A narrow-distribution small-particle-size nickel-cobalt-aluminum hydroxide serves as a precursor of a nickel-cobalt-lithium aluminate battery positive electrode material active substance, an inner core of secondary spherical particles of the precursor is aluminum hydroxide, a crystal grain cation layer framework of an outer shell layer contains nickel-cobalt-aluminum elements, and the mole percentof nickel is 85-98%; and secondary spherical particles of the precursor have the characteristic of narrow distribution, K90 is (D90-D10)/D50 and is less than or equal to 0.90, D50 is 2.0-6.0 [mu]m, and the energy density and the cycle performance of the battery can be further improved when the secondary spherical particles are used as a positive electrode material of the lithium battery. The invention discloses a preparation method of the narrow-distribution small-particle-size nickel-cobalt-aluminum hydroxide. On one hand, the defect that a precursor synthesized by a solid phase method cannot achieve atomic-level uniformity is overcome, and on the other hand, aluminum hydroxide flocculent precipitate generated in the synthesis process of a conventional liquid phase method is also overcome, so that the precursor with a core-shell structure, good sphericity, compact particles, stable structure and high consistency is obtained.

The invention discloses doped cobaltosic oxide; the morphology of the doped cobaltosic oxide is single-crystal particles or single-crystal-like aggregates, the primary grain size is 200-500 nm, and the half-peak width of the 311 crystal face is 0.2-0.6. The preparation method comprises the steps: adjusting the pH value of a reaction kettle base solution to 7.1+/-0.05; adding a mixed salt solution containing cobalt and doped elements and an ammonium bicarbonate solution into a reaction kettle for reaction, and controlling the pH value of a reaction system to be 7.1+/-0.05; standing and clarifying the slurry overflowing from the full liquid level of the reaction kettle, removing the supernatant, controlling the solid content of the slurry, returning the slurry to the reaction kettle for reaction, and stopping feeding until the reaction reaches the target particle size; and washing, drying, sieving and calcining the obtained material to obtain the doped cobaltosic oxide. The doped cobaltosic oxide has a monocrystal or monocrystal-like aggregate morphology, the compaction density is obviously higher, and a guarantee is provided for synthesis of a lithium cobalt oxide positive electrode material with high energy density.

The invention discloses a super-stain-resistant ceramic tile color-retaining glaze, a stain-resistant ceramic tile and a preparation process of the stain-resistant ceramic tile. The super-stain-resistant ceramic tile color-retaining glaze is prepared from the following components in percentage by weight: 20 to 25 percent of potassium feldspar, 15 to 20 percent of albite, 6 to 15 percent of kaolin,0.5 to 3 percent of talc, 6 to 10 percent of quartz, 2 to 3 percent of zinc oxide, 2.5 to 3 percent of boron-zirconium frit, 10.5 to 20 percent of attapulgite and 5 to 9 percent of calcium phosphate;wherein the mass ratio of the boron-zirconium frit to the attapulgite to the calcium phosphate is 1: (3-6): (2-3). According to the invention, attapulgite with a layered structure is added; both theglaze and agreen body contain a large amount of bound water; during firing, the glaze discharges water; more air holes are generated in the drainage process; formed capillary channels are used for allowing gas generated in the sintering process of carbonate raw materials in the subsequent glaze to escape; the glaze continues to be heated, the components are further molten to fill and level up thecapillary channels, pores in the surface of the ceramic tile are reduced, gas generated during firing is discharged along the capillary channels, the pores of the ceramic tile are obviously reduced, the surface is smooth, and the stain-resistant effect of the super-stain-resistant ceramic tile color-retenting glaze is enhanced.

The invention discloses a high-toughness aluminum sheet strip for a new energy automobile and a production method of the high-toughness aluminum sheet strip. The high-toughness aluminum sheet strip for the new energy automobile comprises, by weight percentage, 0.01-0.08% of Si, 0.06-0.12% of Fe, 0.001-0.02% of Cu, 0.45-0.5% of Mn, 4.1-4.3% of Mg, 0.005-0.02% of Cr, 0.002-0.005% of La, 0.002-0.005%of Ce, 0.01-0.018 % of Ti and the balance Al. The production method of the high-toughness aluminum sheet strip comprises the steps of smelting, casting, milling, soaking, heating, hot rough rolling,hot finish rolling, cold rolling, annealing, finishing and the like. The prepared aluminum sheet strip has excellent properties such as high strength, high toughness, high elongation and high indentation resistance, is smooth in surface, free of orange peels and free of cracking when the stamping depth is 300 mm and can be widely applied to inner plates and outer plates of automobiles.