251 results about "Hardening effect" patented technology

The invention discloses a process for preparing Cu-Cr-Zr alloys applicable to contact lines. The process comprises the following steps that alloys comprising 0.30 to 0.50 percent of Cu, 0.10 to 0.15 percent of Cr, 0.01 to 0.02 percent of Zr and Si are melt in a vacuum induction furnace, wherein alloy elements, namely Cr, Zr and Si, are added by master alloys; fine casting-state crystal grains and oversaturated matrix tissues having secondary dendritic crystal spaces are obtained by controlling solidification velocity and cooling velocity; rolling in fit, drawing deformation and annealing thermal treatment to the fine casting-state crystal grains and oversaturated matrix tissues are carried out so as to control deformation degrees and parameters for the thermal treatment; and the strain-hardening effect and the precipitation strengthening effect are organically combined. Therefore, the alloys have the advantages of excellent tensile strength, electrical conductivity and high-temperature resistant softening capacity and lower cost under the conditions of simplified process and the simpler apparatus and components, and are applicable to industrial production.

The invention provides a preparation method for a rear-earth magnesium alloy. The preparation method comprises the following steps of: casting a magnesium melt, extruding and forming after solution treatment, then carrying out cold-rolling and ageing treatment to obtain the rear-earth magnesium alloy, wherein the rear-earth magnesium alloy comprises Mg, Nd, Gd, Y, Zn and Zr. Compared with the prior art, cold-rolling and ageing treatment is carried out after carrying out solution treatment, extruding and forming, so that a great number of beta phases and LPSO phases exist on a crystal boundary, the crystal boundary is pinned to prevent crystalline grains from growing in a transformation process, crystalline grains in the alloy are refined, and therefore, yield strength of the rear-earth magnesium alloy is improved; the rear-earth magnesium alloy has the LPSO phases with 14H structures, and is regularly distributed along extruding direction; stability of the boundary improves strength and toughness of the rear-earth magnesium alloy; moreover, high-density dislocation is introduced in cold-rolling, and nucleation of beta' phases in an ageing process is promoted, so that ageing hardening effect of the alloy is improved; meanwhile, the beta' phases can be more refined by the cold-rolling.

A surface acoustic wave device includes a transducer electrode formed on a substrate. In one aspect, the electrode has a plurality of layers. At least one of the layers is metal and another of the layers is a material for providing a hardening effect to the metal layer by reinforcement with Al₂O₃ precipitates. In another aspect, the electrode is electrically connected to a metal component that permits electrical connection of the surface acoustic wave device to an electrical device external to the surface acoustic wave device. The electrode has a metal portion of a first metallization. The component is of a second, different metallization. In other aspects, the surface acoustic wave device is made via a method to have such structural aspects.

The invention discloses a beam hardening correction method of CT projection data based on data dependency. The method is based on physics imaging model of medical X-ray, constructs a minimization solution problem between CT projection data, combines the minimization problem and obtains solution of intermediate parameter. For realizing more precise correction result, the method estimates reducing proportion of substance with high density in projection data according to primary correction construction result and CT reprojection. The invention is adaptable for realizing beam hardening correction function of various X-ray CT devices. Compared with the existing method only with water modeling correction, the method of the invention respectively considers differences of beam hardening effect of tissues with different density. Compared with the existing method of bone correction, the method of the invention can automatically adapted to different imaging subjects more flexibly and has better correction precision.

The invention relates to a surface metallurgy process of cobalt containing super-hard high-speed steel, which pertains to the surface metallurgical field. The invention is characterized in that: first, a double-layer glow discharging ion metallic cementation technique is used for filtering an alloying element on the surface of Fe-based material with lower cost so as to form a surface alloying layer; then, a carburizing treatment is carried out to form a surface high-speed steel alloying layer; thereafter, a thermal treatment is carried out to lead the surface high-speed steel alloying layer to have the excellent properties of the super-hard high-speed steel. The hardening characteristics of the super-hard high-speed steel is that fine and dispersed alloy carbide and intermetallic compound are precipitated to generate hardening, the surface hardness of the filtered workpiece reaches at 1000-1150HV after quenching and tempering treatment. The invention has the advantages that: since coarse primary carbide is not formed during the crystallizing process, formidable inhomogeneous carbide in the traditional production of smelting, forging-rolling high-speed steel is solved. Fine and dispersed carbide on the surface metallurgical high-speed greatly improves the hardening effect, saves a great deal of alloying elements, reduces the cost and is capable of being widely used for manufacturing cutting tools of various machine tools.

The invention discloses phenolic resin self-hardening sand and a preparation method thereof. The self-hardening sand is made of roughing sand, phenolic resin, a silane coupling agent, methyl formate, calcium carbonate, aluminic acid ester, ethylene glycol, bentonite and polyamides. The rough sand passing through a 250-mesh screen and the bentonite passing through a 300-mesh screen are mixed, then the phenolic resin, the silane coupling agent, the polyamide, the calcium carbonate, the aluminic acid ester, the ethylene glycol and the methyl formate are added in sequence, rapid stirring is carried out until the materials are mixed fully, and the stirring speed is 129 r/min. The preparation method is simple, the prepared phenolic resin self-hardening sand is small in gas generating amount and does not contain harmful elements of nitrogen, phosphorus, sulphur or the like, the hardening effect is good, and under the condition that the roughing sand is at ambient temperature, the hardening time is 15 to 20 min; the intensity is high, after hardening is conducted for 24 hours, the compressive strength is 7.4 to 8.5 MPa, compared with the self-hardening sand in the prior art, the occurrence rate of the heat crack phenomenon is reduced by 18 percent, and the phenolic resin self-hardening sand is especially suitable for casting of steel castings.

A magnesium alloy having high ductility and high toughness, and a preparation method thereof are provided, in which the magnesium alloy includes 1.0-3.5 wt % of tin, 0.05-3.0 wt % of zinc, and the balance of magnesium and inevitable impurities, and a preparation method thereof. Magnesium alloy with a relatively small tin content is added with zinc, and optionally, with one or more alloy elements selected from aluminum, manganese and rare earth metal, at a predetermined content ratio. As a result, the alloy exhibits superior ductility and moderate strength due to the suppression of excessive formation of precipitates and some precipitates hardening effect, respectively. Accordingly, compared to extruded material prepared from conventional commercial magnesium alloys, higher ductility and toughness are provided, so that the alloy can be widely applied over the entire industries including automotive and aerospace industries.

A CT machine able to automatically eliminate the false black image features that the hardening effect of ray beam and the scatter effect of bed plate are integrally processed to obtain a calibration table, and the calibration table is input to its computer for eliminating the false black image. Said processing procedure is also disclosed.

The invention discloses a preparation technology of a 6-series aluminum alloy friction stir welding member. The preparation technology mainly comprises the steps of on-line or off-line solution hardening, preageing, friction stir welding, peak-value artificial ageing and the like. According to the preparation technology of the 6-series aluminum alloy friction stir welding member, a 6-series aluminum alloy material is subjected to low-temperature preageing treatment after being subjected to solution hardening to enable the strength of aluminum alloy to keep low in a certain time, then frictionstir welding is conducted, forced cooling is conducted in a welded high-temperature area while welding is conducted to enable a solution hardening effect to be achieved, and peak-value artificial ageing is conducted on the overall member after welding is completed, so that it is guaranteed that the strength loss at the welded portion is low, and the ratio of the tensile strength of a weld joint tothe tensile strength of a base material is larger than or equal to 0.85.

The invention discloses a high-toughness and high-wear-resistant cold-work die steel, belonging to the field of tool and die steels. The steel comprises the following chemical components in percentage by weight: 0.8-1.5% of C, 0.5-1.5% of Si, less than or equal to 0.030% of S, less than or equal to 0.030% of P, less than or equal to 1.5% of Mn, 0.8-2.5% of Mo, 8.0-11.0% of Cr, 0.1-1.0% of V, less than or equal to 1.0% of N, and the balance of Fe and inevitable impurities. Compared with the prior art, the high-toughness and high-wear-resistant cold-work die steel disclosed by the invention keeps high wear resistance, and has higher toughness and bending strength and good comprehensive performances at the same time. Compared with a Cr12 type cold-work die steel, the high-toughness and high-wear-resistant cold-work die steel reduces the Cr content, and ensures that a material has higher toughness. Compared with a Cr8 type cold-work die steel, the high-toughness and high-wear-resistant cold-work die steel increases the Cr content, increases the wear resistance, and reasonably controls the C/Cr ratio, thus achieving the purposes of obtaining a better carbide distribution state than the Cr8 type cold-work die steel, and ensuring that the material has better toughness. The content of elements Mn and Si is increased so as to improve the hardness and enhance the wear resistance. By adopting relatively high Nb<+>V composite alloying, the effects of V in the steel are increased, and the secondary hardening effect is improved.

The invention discloses an oscillation control method for a micromechanical resonator and the micromechanical resonator. The micromechanical resonator comprises a substrate, and an oscillation structure and a driving structure which are arranged on the substrate. The driving structure is used for driving the oscillation structure of the micromechanical resonator to move in a reciprocating way, generating facilitating electrostatic force which is applied to the oscillation structure and facilitates reciprocating movement of the oscillation structure when the oscillation structure moves in the reciprocating way, and generating restricting electrostatic force which is applied to the oscillation structure and restricts reciprocating movement of the oscillation structure so that frequency deviation generated by the softening effect of an electrostatic spring and frequency deviation generated by the hardening effect of the electrostatic spring in reciprocating movement of the oscillation structure can be mutually cancelled, and thus the micromechanical resonator is controlled to work at the inherent frequency and work stability of the micromechanical resonator is enhanced.

The invention provides a non-solid-solution treatment short-process preparing method for a high-performance Cu-Cr-Ag alloy. A Cu-Cr-Ag alloy rod billet is prepared and obtained through up-drawing continuous casting, and the up-drawing temperature is 1200-1250 DEG C; multi-pass drawing is conducted; aging is conducted; and final drawing is conducted. The supersaturated solute atomic concentration is obtained through the fast-cooling process of up-drawing continuous casting, solid solution treatment is not conducted, solute atoms are promoted to precipitate directly through matching of subsequent drawing and the aging technology, the recrystallization degree is controlled synchronously to retain a certain machining hardening effect, and through strengthening mechanisms of solid-solution strengthening, aging precipitation phase strengthening and cold work hardening, and the purpose of preparing the high-strength and high-conduction softening-resisting Cu-Cr-Ag alloy can be achieved without solid solution treatment. The tensile strength of materials can reach 500-755 MPa, the conductivity is 70-85% IACS, the elongation is 1-14%, and the softening temperature can reach 550-600 DEG C. The short-process preparing method has the characteristics of the short process, high efficiency and low energy consumption, and the prepared Cu-Cr-Ag alloy can meet the practical application demand ofthe fields such as semiconductors and rail traffic.

The invention relates to the field of explosives and in particular relates to a rubber explosive for explosion hardening. The technical problems that the consistency is low, the low-temperature resistance is low, the explosive is difficult to form, the adhesiveness with the metal surface is low, the manufacturing process is toxic, large-scale production cannot be realized and the like existing in metal surface hardening at present are solved. The rubber explosive for explosion hardening is prepared by the following steps: (a) placing rubber in gasoline, and standing for 24 hours; (b) fully dissolving an adhesive in the gasoline; (c) preparing an additive mixing system, namely mixing the rubber, the adhesive, a plasticizer, a rubber accelerator and an oxidizing agent uniformly; (d) uniformly kneading the additive mixing system and the explosive into paste; (e) repeatedly pressing the explosive paste into sheets of the needed thickness; (f) naturally airing; and (g) cutting the explosive sheets into specific shapes, thereby obtaining the rubber explosive for explosion hardening. According to the formula, the low-temperature resistance and processibility of the explosive can be improved, and the explosion hardening effect of the explosive is guaranteed.

An anti-freezing alkali-free liquid accelerator and a preparation method thereof are disclosed. The accelerator is mainly prepared from water-soluble aluminium salt, polyaluminium salt, alkaline earthnitrate and/or carbonate, alkaline earth fluoride salt, alcamines organic matter and water. The preparation method comprises the following steps: firstly dissolving a part of water-soluble aluminiumsalt by the use of a part of water, heating and stirring, adding polyaluminium salt and alkaline earth nitrate and/or carbonate, heating and reacting, cooling, successively adding alkaline earth fluoride salt, alcamines organic matter and the rest of water-soluble aluminium salt, adding the rest of water, and filtering. After the accelerator with the dosage of 4% is added into cement, initial setting time of cement paste is less than or equal to 4 min, and final setting time is less than or equal to 8 min; and early strength and long-term strength are both high. The accelerator of the invention has good storage stability at room temperature, low temperature and high temperature. In the case of redissolving after freezing, almost no precipitate is precipitated out, and the rapid hardening effect is not attenuated. The method of the invention has advantages of simple process, low cost and zero emission, and is suitable for industrial production.

The invention relates to a preparation method of high-melt strength polypropylene resin with long-chain branched structure characteristic. According to the preparation method, polymerization reactions are carried out section by section based on MgCl2/ TiCl4 type high-efficiency Ziegler-Natta catalysts. The preparation method comprises the following steps of carrying out propylene homo-polymerization, generating a homo-polypropylene matrix framework-linear polypropylene resin matrix, introducing alpha, omega-alkadiene monomer to carry out copolymerization, generating co-polypropylene in which the long chain is branched and some parts are interlinked, and evenly dispersing the co-polypropylene in which the long chain is branched and some parts are interlinked into a linear polypropylene resin-based polypropylene resin body to obtain the high-melt strength polypropylene resin with the long-chain branched structure characteristic. The preparation method is simple in polymerization technique, the high-melt strength polypropylene resin with the long-chain branched structure characteristic has good particle morphology, and the polymer melt has relatively strong strain hardening effect once being stretched.

The invention relates to a precision investment casting water glass binder shell CO2 gas hardening technology which comprises the following steps of: (1) placing a shell to be hardened in a fully-sealed hardening chamber; (2) starting a vacuum pump to keep the sealed chamber in a vacuum state; (3) introducing CO2 gas into the hardening chamber and starting a fast dehumidifying system so that a coating layer on the shell surface is subjected to chemical reaction and physical dehydration effect together with the CO2 gas to finish the hardening of the shell; and (4) closing a CO2 gas inlet valve and starting a sucking pump to suck the CO2 in the hardening chamber back to a storage tank for circular use. Compared with the traditional technology, the technology provided by the invention has the advantages: 1, the hardening operation environment is good, harmful substances are not discharged in roasting, and thus the technology is an environmentally-friendly production technology; 2, the hardening effect is good, and the phenomenon of halfway hardening of the shell is avoided; and 3, the consumption of CO2 gas is low, and the material cost of the shell hardening agent is reduced.

The invention provides an alkali-free liquid concrete accelerator. The alkali-free liquid concrete accelerator comprises the following components by mass: 35-65 parts of aluminum salt, 3-25 parts of inorganic nano material, 0.5-15 parts of first fluorine substance, 0.5-5 parts of water reducer, 0.5-10 parts of second fluorine substance, and 20-50 parts of water; the first fluorine substance comprises one or a mixture of more of fluoride, fluosilicate and borofluoride; the second fluorine substance is fluosilicate. The provided alkali-free liquid concrete accelerator has a good fast hardening effect, the conservation rate of long-term strength of the concrete is high, and the alkali-free liquid concrete accelerator is suitable for spraying the concrete.

The invention relates to an enhanced cover-type story-adding structure and a hardening method thereof and belongs to the seismic hardening field. A newly-added cover-type story-adding framework is adopted and comprises a cover framework inner column and a cover framework outer column, as well as a cover framework bream arranged therebetween; strip-shaped steel plates are arranged on the upper surface and the lower surface of the cover framework beam; the newly-added cover-type story-adding framework and an original structure are connected through adding the strip-shaped steel plates and end anchoring, so that the novel and new structures are connected more closely and the structural stability is enhanced. Meanwhile, the part of the original structure transverse wall, not meeting the shock-resistant requirement, is hardened through steel pull rods at firstly, and anchor plates at the two ends are connected with the newly-added cover-type story-adding framework in an anchoring manner. By adopting the structure and the method which are provided by the invention, the hardening effect is enhanced, the two structural systems are adopted for bearing together, so that the anti-seismic property is improved on the whole.

The invention discloses an age hardenable Mg-Zn-Cr-Bi-Zr alloy and a preparation method thereof. The alloy comprises the following components in percentage by mass: 4-10% of Zn, 0.1-0.5% of Cr, 0.1-1.0% of Bi, 0.3-0.5% of Zr, and the balance of Mg. The preparation method of the alloy comprises the following steps: preheating a prepared alloy burden, feeding CO2/SF6 mixed gas as a shielding gas for smelting, and carrying out diffusion annealing on the obtained Mg-Zn-Cr-Bi-Zr as-cast alloy material for 48 h at a temperature of 380 DEG C; carrying out wire cutting on the obtained object, so that a sample for aging heat treatment and a platy tensile sample are obtained; carrying out solid dissolving on the samples; and aging the obtained product for 0-400 hours at a temperature of 160 DEG C, so that the age hardenable Mg-Zn-Cr-Bi-Zr alloy is obtained. According to the invention, a Mg-Zn-Cr-Bi-Zr alloy which has a relatively thin as-cast structure and is good in age hardening effect, thermal stability and mechanical properties and low in cost can be prepared.

The invention provides a construction method of a paving type high wear-resistant alloy floor. The invention improves the construction technology of the original alloy floor. The finished floor not only ensures the overall aesthetics and applicability, but also has the effects of hardening, compacting, sealing, and dustproof, achieving high wear resistance and high durability. Scratch resistance, high impact resistance, high cleanliness and other properties.