33results about How to "Avoid mechanical performance degradation" patented technology

The invention provides a steel bar with high weather resistance, low cost and seawater corrosion resistance and a production process. The steel bar comprises the following elementary compositions of,by weight, 0.04%-0.10% of C, 0.10%-0.50% of Si, 0.5%-1.6% of Mn, 0.03% or less of P, 0.02% or less of S, 2%-4% of Cr, 0.3%-0.5% of Cu, 0.2%-0.6% of Ni, and the balance Fe and inevitable impurities. According to the steel bar, the mechanical property meets the requirement of the steel bar for corrosion resistance, the aging strain is low, and the corrosion rate is lower than 70% that of common steel bars. The technical path of the process comprises a 70-ton ultrahigh-power electric furnace, LF ladle refining, deoxidation and alloying after steel discharging, argon blowing, continuous casting of165 square billets at four streams by four machines, a heat accumulating type stepping heating furnace, 18 non-twist tandem mills, controlled-rolling and controlled-cold cooling, finishing, packagingand storage.

The invention belongs to the field of aluminum alloy materials and discloses a high-strength corrosion-resistant aluminum alloy. The high-strength corrosion-resistant aluminum alloy comprises the following components: 1.3-1.8% of Mg, 1.5-2.0% of Si, 0.7-0.9% of Mn, 0.1-0.4% of Cu, 0.3-0.8% of Zn, 0.1-0.3% of Fe, 0.08-0.2% of Cr, 0.1-0.3% of other alloying elements and the balance Al; the other alloying elements comprise Ni, V, Ti, Zr, and a combination of rare earth elements, with a ratio being (0.2-0.4): (1.6-1.8): (0.4-0.6): (1.4-1.6): 0.2; the ratio of Zn to Fe is 3:1; and the rare earth elements comprises Gd, La, Eu, with Gd accounting for 60% or more of the total amount of the rare earth elements. The aluminum alloy of the invention improves the strength and mechanical properties by improving the material formula, and is mainly used for manufacturing some aluminum alloy parts which require corrosion resistance and certain high strength.

The invention discloses a bentonite based composite sealing rod, and belongs to the technical field of building materials. The developed bentonite based composite sealing rod comprises modified bentonite, a water absorbent resin, poly-allylamine, a rubber compound, a tackifying resin, a plasticizer and an antiager. In the preparation process, the rubber is plasticated firstly to obtain a plasticated rubber, then the plasticated rubber, the modified bentonite, the water absorbent resin, the plasticizer, the antiager, the tackifying resin and the poly-allylamine are mixed, extracted and formed to obtain the bentonite based composite sealing rod, wherein the modified bentonite is prepared by mixing and ball-milling the bentonite, isocyanate and a coupling agent.

The invention belongs to the field of an aluminum alloy material and discloses high-strength weldable aluminum alloy. The high-strength weldable aluminum alloy comprises the following components: 0.4to 1.2 percent of Mg, 0.7 to 1.4 percent of Si, 0.2 to 0.7 percent of Mn, 0.05 to 0.2 percent of Cu, 0.1 to 0.5 percent of Zn, 0.4 to 0.6 percent of Fe, 0.05 to 0.15 percent of Cr, 0.1 to 0.3 percentof other alloy element and the balance of Al, wherein other alloy element comprises combination of Ni, V, Ti, Zr and rare earth element with the ratio of (1.2-1.4):(0.6-0.8):(2.4-2.6):(0.4-0.6):0.2; and the rare earth element comprises Ce, La and Er, and Ce account for more than 60 percent of the total amount of the rare earth element. Through improvement of the original formula, the aluminum alloy improves strength and mechanical property and can serve as aluminum alloy parts, such as an end plate and a tray, in a power battery of a new energy automobile.

The invention relates to a method for controlling directional growth of alloy grains in a laser additive manufacturing process. A method for controlling directional growth of alloy grains in the laser additive manufacturing process comprises the steps that a base material is selected, laser remelting treatment is conducted on the surface of the base material, and then laser additive manufacturing is conducted on the remelted surface. By means of the method, crystal grains can grow in an oriented mode, the mixed crystal generation probability is reduced, the bad influence of a transverse crystal boundary on high-temperature alloy is reduced, a prepared component structure can grow in an epitaxial mode according to the original crystal grain orientation of a remelting layer, and the better mechanical property is achieved in the low-temperature single-stress and high-temperature environment.

The invention discloses a novel anti-corrosion coating and a preparation method thereof and solves the problem of reduction of mechanical performances of the coating since a corrosion inhibitor on a fly ash anti-corrosion coating in the prior art is difficult to disperse. In the invention, through a reflux method, phenyl phosphonic acid and a surfactant are grafted on surface of fly ash, wherein the phenyl phosphonic acid and the surfactant are hydrolyzed during a heating process and are connected to a part of hydroxyl groups on the surface of the fly ash. The grafted fly ash finally turns into sea urchin-like granules. The phenyl phosphonic acid increases dispersion of fly ash particles in resin and combination area of the fly ash particles with resin, thereby greatly improving anti-wear performance of coating. The phenyl phosphonic acid and the surfactant can enable the corrosion inhibitor to be dispersed in nano-micro pores in the fly ash more uniformly, thereby achieving the corrosion inhibition effect and improving the anti-corrosion performance of the coating.

The invention relates to a segmentally rolling method for a large-scale high-temperature alloy high-cylindrical forging piece. The segmentally rolling method for the large-scale high-temperature alloyhigh-cylindrical forging piece comprises the steps of after heating, forging, chambering a blank and pulling a central spindle, firstly adopting a segmental irregular mold for segmentally and locallyrolling the annular blank, and then adopting a direct-wall mold for integrally rolling the segmentally and locally rolled annular piece, wherein the segmental irregular mold comprises an irregular main roller and an irregular core roller, the roller surfaces of the irregular main roller and the irregular core roller locally contact a wall surface of the annular blank, the direct-wall mold comprises a direct-wall main roller and a direct-wall core roller, the roller surfaces of the direct-wall main roller and the direct-wall core roller partially contact the blank during the rolling process and integrally contact the blank after rolling; and coating a heat-insulation coating on the roller part of the segmentally rolled annular piece, so that the integral mechanical property of the annularpiece during a follow-up rolling process is ensured. Through the method, the utilization ratio of the material and the mechanical property and the quality of the material can be improved, and meanwhile, the requirement for the rolling force of the equipment is lowered.

The invention discloses a method for improving the mechanical property of a carbon fiber-reinforced aluminum matrix composite. The invention aims to solve the problem that an interface product Al4C3 is easily generated on an interface of an aluminum alloy and carbon fibers during preparation of an existing carbon fiber-reinforced aluminum matrix composite. The method comprises the following steps of: weighing an aluminum-cerium intermediate alloy and the aluminum alloy as raw materials, heating and melting the aluminum alloy at high temperature, adding the aluminum-cerium intermediate alloy, and stirring to obtain a cerium-containing aluminum alloy melt; and carrying out pressure infiltration and heat treatment. The thermodynamic principle is utilized, elements easy to segregate are added and segregated and separated out on the grain boundary, so that the interface contact state of the carbon fibers and an aluminum matrix is improved, the surface energy of the grain boundary can be reduced, and interface reaction is reduced. Therefore, the interface reaction of the carbon fibers and the aluminum matrix is inhibited, damage to the carbon fibers is reduced, and the mechanical property of the composite is improved. The method is suitable for preparing the carbon fiber-reinforced aluminum matrix composite.

The invention discloses stainless steel for medical instruments and a preparation method thereof. The stainless steel for the medical instruments comprises the following components of, in percentage by weight, 0.01%-0.07% of C, 0.02%-0.06% of Mn, 16%-18% of Cr, 6%-8% of Ni, 0.4%-0.8% of Mo, 0.03%-0.05% of V, 0.06%-0.1% of Nb, 0.8%-1.2% of Al, 0.01%-0.02% of B+S+F, 0.14%-0.36% of Ag, 0.14%-0.36% ofCu, the content of Sn is equal to the sum of the content of Cu and Ag, 0.01%-0.03% of silicones, 0.002%-0.004% of nanometer silicate fiber, and the balance of Fe. According to the stainless steel forthe medical instruments and the preparation method thereof, firstly, carrying out C, B and Fe alloying, S, C and Fe alloying, and Cu, Sn and Ag alloying on stainless steel for the medical instruments, and then obtaining the stainless steel through adding other components to carry out melt mechanical machining. The stainless steel for medical instruments and the preparation method thereof disclosed by the invention have the advantages that the hardness, the corrosion resistance and the high-temperature oxidation resistance of the medical instrument materials are improved.

The invention discloses a HDPE (high-density polyethylene) pipe and a preparation method thereof. The HDPE pipe comprises modified nano-calcium carbonate, HDPE, nano-calcium carbonate, p-hydroxybenzoic acid, organic silane modified linear low-density polyethylene, dibutyltin dilaurate and lubricants. The weight ratio of the p-hydroxybenzoic acid, the organic silane modified linear low-density polyethylene to the dibutyltin dilaurate is (5-15):(5-15):(0.1-1), and the HDPE pipe is prepared by the steps of raw material preparation, primary blank preparation, finished product processing and the like. Compared with the prior art, the HDPE pipe has the advantage that performances such as the tensile strength and the breaking elongation of the pipe are further improved.

The invention discloses a thermoplastic fiber metal laminate and a preparation method thereof. The preparation method comprises S1, providing a thermoplastic blended woven fabric, S2, overlaying the thermoplastic blended woven fabric and a metal material layer to obtain a laminated plate, and S3, hot-pressing the laminated plate and carrying out cooling molding to obtain the thermoplastic fiber metal laminate. The thermoplastic blended woven fabric is woven from a fiber bundle. The fiber bundle comprises a thermoplastic fiber material and a reinforcing fiber material. The preparation method issimple and improves the interlayer bonding force and mechanical properties of the thermoplastic fiber metal laminate.

The invention discloses an environment-friendly chest-protecting athletic undergarment having strong air permeability and high stability. The environment-friendly chest-protecting athletic undergarment comprises a back support, adjustable shoulder straps, a cover bellyband, a zipper and a sweat absorbing cushion, wherein the outer side of the back support is connected with the cover bellyband through the adjustable shoulder straps, the lower end of the cover bellyband is provided with the zipper, the sweat absorbing cushion is plug-connected in the cover bellyband and also comprises a modal fabric layer, a water-absorbing sponge layer and a cotton spun fabric layer, the modal fabric layer serves as an innermost side layer, the upper surface of the modal fabric layer is provided with the water-absorbing sponge layer, the upper surface of the water-absorbing sponge layer is provided with the cotton spun fabric layer, the water-absorbing sponge layer is prepared from polyether polysaccharide, toluene diisocyanate, dichloromethane, organic silicone oil, porous adsorption powder, dimethyl ethanolamine, stannous caprylate, cellulose, super absorbent resin, deionized water, high purity ammonium sulfate, soft long filament and chitin fiber. The air permeability and mechanical property of the environment-friendly chest-protecting athletic undergarment can be improved.

The invention provides a flame-retardant wall brick. The flame-retardant wall brick is prepared from the following raw materials in parts by weight: 100-200 parts of white cement, 50-100 parts of expanded polystyrene, 15-30 parts of porous flame-retardant hollow microspheres, 50-100 parts of silicon oxide aerogel, 10-20 parts of bentonite or modified bentonite, 5-12 parts of feldspar, 1-3 parts of a water-retaining agent, 5-10 parts of fibers and 2-5 parts of calcium carbonate. The flame-retardant wall brick has good fireproof, moisture-proof, heat-insulating and sound-insulating properties and mechanical properties.

The invention discloses an anti-falling and anti-deformation paper packaging box and a preparation process thereof. The packaging box is formed by hot-pressing bonding of an outer layer, an outer sponge, a middle layer, an inner sponge and an inner layer, the outer layer and the inner layer are formed by dipping and hot-pressing of carbon fibers and kraft paper with increased surface active groupsafter surface grafting polyurethane treatment, the outer sponge and the inner sponge are high-concentration polyurethane sponges and have good energy absorption and recovery capacity, and the middlelayer is prepared by blending and modifying high-density polyethylene, compatibilizers, thermoplastic polyurethane and light calcium carbonate. The packaging box has tensile, anti-falling and anti-deformation capabilities, so that a box body and articles in the box body can be more effectively protected.