1723results about How to "Inhibition of segregation" patented technology

The invention discloses a ferric powder composite block preparing technology, which is characterized by the following: separating fine ferric ore individually; preparing ball; blending rough particle with ferric powder and other raw materials; paving on the traditional sintering machine; inserting high-alkaline sintering ore of acid ball ore.

The invention relates to a high abrasion-proof laser cladding nickel-base alloy powder and a preparation method of the alloy powder. The high abrasion-proof laser cladding nickel-base alloy powder is characterized by comprising matrix alloy powder, hard carbide particles and a bonding agent; and the combined powder comprises 50-98% of matrix alloy powder, 1-45% of WC or TiC or mixed powder of WC and TiC, and 1-5% of bonding agent. The preparation method comprises the following steps of: preparing the matrix alloy powder, adding the carbide particles into the prepared matrix alloy powder, adding the bonding agent into the mixture, stirring, ball milling, combining the powder, drying, crushing and screening. The high abrasion-proof laser cladding nickel-base alloy powder not only is high in hardness, but also has excellent wear resistance and corrosion resistance, thus being especially suitable for laser cladding of alloy workpieces with high surface hardness and high wear resistance. Furthermore, the phenomenon of segregation caused by great differences among the specific gravities of all components in the processes of storage, transportation and using can be effectively prevented.

The invention relates to high-strength weather resisting steel with Cu2-xS dispersed precipitates, which comprises the following chemical components in percentage by weight: 0.04-0.08% of C, 0.20-0.40% of Si, 0.4-1.0% of Mn, 0.03-0.12% of P, not more than 0.2% of S, 0.01-0.06% of Al, 0.20-0.80% of Cu, 0.40-0.6% of Cr, 0.12-0.40% of Ni, 0.001-0.006% of Ca and the balance of Fe and inevitable impurities. The welding cold crack sensitivity coefficient Pcm is not more than 0.18%. A manufacturing method comprises the following steps of: acceleratedly cooling both sides of a cast belt formed by continuous casting by using a gas and adopting a thin belt continuous casting production technology, wherein the cooling rate is 150-200 DEG C / s; performing the entire double-roller continuous casting process in a closed chamber filled with protective atmosphere; and arranging one to two stands for online hot rolling, wherein the thickness of a finished steel belt reaches 0.6-2 mm. The desulfurization procedure in steel making process can be omitted, and the steel making cost is reduced. The segregation of copper elements is inhibited, meanwhile, a large quantity of dispersed Cu2-xS precipitates can be formed to achieve the effect of dispersion strengthening.

The invention relates to gold potassium citrate for gold plating and a preparation method thereof. The gold potassium citrate is used to substitute for gold potassium cyanide in acidic and neutral gold plating technology. The problem that the product coverage area is too wide when gold citrate is used in the gold plating technology is solved. The technical scheme is that the gold potassium citrate is the mixed crystal of gold potassium cyanide and citric acid potassium salt and the chemical composition of the gold potassium citrate is KAu (CN)2 (K3C6H5O7. k1C6H8O7) k2, wherein KAu (CN)2 is gold potassium cyanide, K3C6H5O7.k1C6H8O7 is citric acid potassium salt which is mixed by potassium citrate K3C6H5O7 and citric acid C6H8O7, k1 is the molar ratio of potassium citrate to citric acid, is more than or equal to zero and is less than or equal to three, and k2 is the molar ratio of citric acid potassium salt to gold potassium cyanide, is more than or equal to one point three and is less than five. The method is mainly suitable for the acidic and neutral gold plating technology.

The invention discloses high-strength high-tenacity non-quenched-and-tempered round steel, and relates to the technical field of non-quenched-and-tempered steel. The high-strength high-tenacity non-quenched-and-tempered round steel is prepared from the following chemical components by mass percent: 0.27%-0.33% of C, 0.40%-0.70% of Si, 0.10%-0.30% of Cr, 1.30%-1.65% of Mn, 0.065%-0.100% of S, 0.005%-0.040% of Al, 0.06%-0.020% of V, 0.010%-0.040% of Ti, 0.0120%-0.0250% of N, the balance of Fe and unavoidable impurities, wherein manganese equivalent Mneq is 1.70%-2.10%. The high-strength high-tenacity non-quenched-and-tempered round steel is capable of increasing a free-cutting element S with low cost, forming dispersed distribution of a sulfide and a V (N, C) compound, through continuous uniform cooling rolling and temperature control cooling after rolling, a high-tenacity non-tempering steel bar with a good mechanical property is obtained, wherein rolled metal ballistic work reaches 190 J or more.

The invention provides oxide particle reinforced laser cladding high-wear resistance nickel-base alloy powder and a preparation method thereof. The powder is characterized by comprising basal body alloy powder, oxide hard particles and binding agent, and is proportioned as follows: 50-98 percent of basal body alloy powder, 1-45 percent of one of Al2O3, Cr3C2 and ZrO2 or combined mixture powder of more than two thereof, and 1-5 percent of binding agent are prepared to combined powder. The preparation method comprises the technique steps of preparation of basal body alloy powder, addition of oxide particles, addition of binding agent, stirring and ball milling, powder combination, drying, crushing and screening. The oxide particle reinforced laser cladding alloy powder has higher hardness and toughness, has excellent wear resistance and corrosion resistance, and is particularly suitable for laser cladding of alloy workpieces with higher surface hardness and high wear resistance; and the powder can effectively prevent segregation caused by great difference among specific gravities of all components in the process of storage, transportation and use.

The invention discloses a blast furnace chute multi-ring burden distribution, which comprises firstly calculating the distance from the center of furnace burden from the center of a blast furnace after furnace burden fell into an xy plane, secondly deciding largest and smallest burden distribution angles in theory, thirdly deciding the actual burden distribution angles of outer ring and inner ring of ores and coke, fourthly deciding the burden distribution ring number of ores and coke, determining the burden distribution angle of middle ring of ores and coke and the angel difference of adjacent rings, and sixthly determining the burden distribution rings of each ring in ores and coke. The process largely enriches the regulating method on the upper portion of the blast furnace, changes coal gas distribution, effectively increases the coal gas usage of the blast furnace, reduces coke ratio, realizes the stable and long term operation of the blast furnace, has strong loading material capacity, can eliminate furnace burden gravity segregation and the existing of pile top, much reasonably distributes furnace burden, is beneficial for strengthening smelting, and improves the press amount relationship and further increases the air quantity of the blast furnace.

The invention relates to a high abrasion-proof laser cladding cobalt-base alloy powder and a preparation method of the alloy powder. The high abrasion-proof laser cladding cobalt-base alloy powder is characterized by comprising matrix alloy powder, hard carbide particles and a bonding agent; and the combined powder comprises 50-98% of matrix alloy powder, 1-45% of WC or TiC or mixed powder of WC and TiC, and 1-5% of bonding agent. The preparation method comprises the following steps of: preparing the matrix alloy powder, adding the carbide particles into the prepared matrix alloy powder, adding bonding agent into the mixture, stirring, ball milling, combining the powder, drying, crushing and screening. The high abrasion-proof laser cladding cobalt-base alloy powder not only is high in hardness and toughness, but also has excellent wear resistance and corrosion resistance, thus being especially suitable for laser cladding of parts with high impact resistance and high abrasion-proof property. Furthermore, the phenomenon of segregation caused by great differences among the specific gravities of all components in the processes of storage, transportation and using can be effectively prevented.

The invention discloses a direct vat set modifier of a cast asphalt mixture and is characterized in that the modifier is composed of the following components, by weight, 30-80 parts of a styrenic thermoplastic elastomer, 10-20 parts of plastic, 1-10 parts of rubber powder, 1-5 parts of a packing powder, 5-40 parts of fuser oil, 5-30 parts of a dispersing auxiliary agent and 0.1-5 parts of a crosslinking auxiliary agent. The invention also discloses a preparation method of the modifier and an asphalt mixture prepared from the modifier. The material can be directly put into a mixing plant cylinder to produce modified asphalt concrete. The produced asphalt concrete completely satisfies engineering needs. In comparison with a traditional SBS modification process, the method provided the invention has the following advantages: the step of producing modified asphalt in a traditional method is saved; production equipment of modified asphalt is save; there is no need in hot storage of modified asphalt; performance attenuation and separation of modified asphalt under hot storage condition are avoided; and positive contributions are made to low temperature and fatigue performance of the asphalt mixture.

The invention relates to a method for indirect extrusion casting by utilizing the filling of electromagnetic force and a device thereof. In the method, electromagnetic force is utilized to introduce liquid metal into an extrusion chamber to fill part of a mould cavity by a transmission pipeline; when the liquid metal in the mould cavity reaches a preset quantity, the transmission of the liquid metal is stopped; and an extrusion punching head ascends to push the liquid metal to fill the part which is not full in the mould cavity and continuously ascends to extrude and shape the liquid metal, and the liquid metal in the transmission pipeline flows back to a thermal insulation furnace under the function of reverse electromagnetic force. The invention has simple and convenient method, high automatization degree, good stability and skillful structural design of a special device. The liquid metal is transmitted and filled by a sealed transmission pipeline, and oxidation and air suction are reduced; the flow speed and the flow rate are controllable, and the quantification of extrusion casting is realized; at the time of extrusion shaping, the liquid metal in the transmission pipeline flows back, and the production efficiency is enhanced; and the friction and the abrasion of the extrusion punching head and the extrusion chamber are reduced, and the service lives of the extrusion punching head and the extrusion chamber are enhanced.

The invention discloses continuous casting crystallizer casting powder for large circular blank abrasion resisting high manganese steel. According to the continuous casting crystallizer casting powder for the large circular blank abrasion resisting high manganese steel, cracks are reduced by adopting low carbon amount and high viscosity, reducing thermal stress inside blank shells and increasing powder consumption amount. The alkalinity of the casting powder is 0.8-1.1, the cracks caused by uneven heat transmission are avoided; through the adoption of 8-12% of Na2O, 6-8% of F- and 3-4.5% of Li2O, weak coldness and even heat transmission of the upper portion in a crystallizer are achieved, inclusion absorbing effects are improved, and the cracks are reduced; through the adoption of 2-8% of MnO, lattice vibration and conduction heat transmission are weakened, and the crystallization properties of the casting powder and the casting blank quality are improved. Raw materials of the continuous casting crystallizer casting powder for the large circular blank abrasion resisting high manganese steel are easy to obtain, and production cost is low. Through field testing, the casting power is good in spreadability and good in air permeability and can be smelted stably and be free of caking, the consumption amount of the casting powder is around 0.3-0.42kg per ton of steel, the consumption cost is relatively low, and the qualified rate of the first grate casting blanks is improved significantly.

The invention relates to a preparation method of anode material vanadium-lithium phosphate powder for lithium ion battery, belonging to the technical field of battery material. The preparation method provided in the invention is implemented by homogenizing raw materials followed by secondary drying to obtain a precursor, heating at 550-1000 DEG C in non-oxide atmosphere to prepare vanadium-lithium phosphate powder. In the method, the precursor homogenized on micro-scale is prepared by secondary drying, raw materials can be mixed on molecular level of the solution, all the elements are uniformly mixed, thus avoiding composition segregation, ensuring super close contact among raw materials, overcoming the defect of incomplete contract of raw materials in solid phase technique and greatly reducing reaction activation energy; the whole process dispenses with procedures of grinding, pre-treating, crushing and the like, the prepared material has higher specific discharge capacity and capacity retention rate, and the method is simple in technique, continuous in operation and easy for industrial production.