49results about How to "Strengthen the matrix" patented technology

The invention relates to a bamboo-based/thermoplastic plastic nanocomposite material and manufacturing technology thereof. The technology comprises the following steps of: using a thermoplastic plastic as a matrix, and using bamboo fibers as an enhanced phase; modifying the bamboo fibers through nano particles so as to improve the compatibility with the matrix, the flux flow rate and the mold resistance of the composite material; and manufacturing the bamboo-based/thermoplastic plastic nanocomposite material through highly mixing, pelleting, extrusion molding, and other processing technology.The invention provides a bamboo-based/thermoplastic plastic nanocomposite material which has the advantages of high physical mechanical strength, high interface compatibility, high flux flow rate andhigh mold resistance. The bamboo processed wastes and wasted plastics are fully utilized, and the ecological environment is protected. The product can be applied to outdoor gardening landscape, outdoor furniture, outdoor floors, wall hanging boards, guardrails, trays, packaging cases and automotive interior decoration materials, and the like.

The invention belongs to the metallic material field, relating to aluminium base composite materials used in a piston and a preparation method thereof. The composite materials comprise a matrix alloy and a wild phase. The matrix alloy comprises silicon, copper, nickel, magnesium, phosphorus, titanium and aluminium and is characterized in that the matrix alloy comprises the components according to the mass percent: 10.0-25.0% of silicon, 0.5-2.5% of copper, 0.5-4.0% of nickel, 0.2-1.5 of magnesium, 0.2-3.0 % of phosphorus, 0.01-1.0% of titanium and the rest is magnesium. The wild phase is AIP particles generated by reaction in situ. The preparation method comprises the following steps: the raw materials are weighted according to the mass percent; flash set argon pulverization treatment is carried out on Si-P interalloy; the commercially pure aluminium, silicon, copper, nickel, magnetism and titanium are melted into multielement aluminium alloy in a smelter hearth in the temperature of 760 DEG C to 850 DEG C, and is added with flash set Si-P interalloy particles after refining; the metal mold gravity casting or the extrusion casting are used for pouring piston rough; T6 heat treatment is carried out on the casting rough. In the invention, the production can be carried out by using a common aluminium alloy smelting unit in atmosphere condition. The invention has simple technique and low production cost.

The invention relates to a high-strength cast aluminum-silicon alloy for an engine body and a preparation method thereof, belonging to the field of metal materials. The alloy comprises the following components in percentage by weight: 12.0-14.0% of Si, less than 0.3% of Ni, 3.0-5.0% of Cu, 0.3-0.8% of Fe, 0.4-0.8% of Mn, less than 0.4% of Mg, 0.1-0.2% of Ti, less than 0.27wt% of Zr and balance of Al. Heat treatment parameters are as follows: the solution treatment is carried out at 510+/-5 DEG C for 5-8h and then water quenching is carried out at room temperature; and the aging treatment is carried out at 160+/-5 DEG C for 6-10h and then air cooling is carried out. The tensile strength and the yield strength of the alloy at room temperature after heat treatment respectively reach 316-336MPa and 245-263MPa, the elongation of the broken alloy reaches 0.72-0.83%, and the Brinell hardness reaches 155-166HBW to the maximum. Compared with the similar alloys, the alloy of the invention has the advantages of high mechanical properties, low content of Ni elements, reduction of content of noble elements in the alloy, wider allowed fluctuation range of content of Fe elements, good cast ingot quality, simple processes and strong operability.

The invention discloses a fixed-length shear blade and a manufacturing method of the fixed-length shear blade. The fixed-length shear blade comprises the following components by weight percent: 0.75-1.00% of C, 0.60-1.40% of Si, 0.20-0.50% of Mn, 6.50-8.00% of Cr, 2.50-4.00% of Mo, 1.80-3.50% of V, less than or equal to 0.020% of S, less than or equal to 0.020% of P, the balance of Fe and the unavoidable impurities; and the manufacturing method of the fixed-length shear blade comprises the technological process of: smelting by an induction furnace, electrode bar pouring, electroslag remelting, ingot casting, forging, preheating treatment, rough machining, hardening and tempering heat treatment, semi-finishing, final heat treatment and finish machining. The fixed-length shear blade is high in strength and wear resistance, thus guaranteeing the shock resistance of the blade.

The invention relates to an extrusion deformation aluminum-lithium alloy with high Zn content and high strength and toughness, and a preparation method thereof. The alloy comprises, by weight, 4.1%-5.5% of Zn, 2%-4.5% of Cu, 2%-3% of Mg, 1%-2% of Li, 0.1%-0.5% of Zr, less than 0.25% of impurity elements in total, and the balance Al. Through melting and casing as well as extrusion deformation, theextrusion deformation aluminum-lithium alloy with high Zn content is prepared. Through deformation and aging treatment, not only lots of Tl(Al2CuLi) but also S' (Al2CuMg) phases and eta' (MgZn2) phases are precipitated from the alloy with high Zn content, and the strength and toughness of the alloy are improved effectively. The aluminum-lithium alloy prepared with the preparation method provided by the invention not only has excellent mechanical properties, but also is low in alloy cost, and has broad application prospects in the fields, such as aerospace, high-speed railways and robots.

The invention relates to a method for forming the internal threads of a composite material, which comprises: circumferentially winding a nonwoven fabric impregnated with resin on the surface of a threaded part of a mandrel; spreading a resin substrate mixed with inorganic material crystal whiskers on the circumferentially wound nonwoven fabric layer, wherein the height of the resin is no lower than the top of the teeth of the threads of a mold; circumferentially paving a reinforcing unidirectional fiber fabric on the surface of the mandrel, wherein the fiber direction of the reinforcing unidirectional fiber fabric is consistent with that with the mandrel and the thickness of the reinforcing unidirectional fiber fabric is no greater than one third of the height of the teeth; winding reinforcing circumferentially wound fibers on the surface of the unidirectional fiber fabric, wherein the belt width is no greater than the thread pitch of the threads; spirally winding tube body fibers to a required thickness; and performing curing and demolding. In the structure, a method combining the reinforcing fiber unidirectional fiber fabric and circumferential winding to form the internal threads of a composite material tube and the reasonable distribution of the reinforcing fibers on the thread tooth part in a load bearing direction reinforces the resin substrate, so the internal thread part has a strength high enough for threaded connection.

The invention relates to a manufacturing method of nodular cast iron for high-temperature parts of combustion engines, in particular to a manufacturing method of heat-resistant high-silicon-molybdenum nodular cast iron. The method comprises the following steps that chemical parameters, raw materials and weight percentage compositions are determined, wherein the nodular cast iron comprises, by weight, 30 percent-40 percent of pig iron, 20 percent-30 percent of scrap steel, 30 percent-40 percent of foundry returns, 1.5 percent-2.0 percent of silicon iron and 1 percent-1.2 percent of ferromolybdenum, and smelting, modification treatment, aging stress relieving technologies are performed. The method is unique, the creep resistance and endurance property of the material are improved, the intensity of the material is enhanced, and the service life of the material is prolonged; the influence on the graphite form by rare earth elements is relieved, the graphite roundness is improved, the fragmentation effect of graphite is relieved, the manufacturing cost and processing costs are reduced, and environmental friendliness and energy saving are facilitated.

The invention belongs to the field of metal materials and relates to a high-temperature wear-resistance high-strength aluminum alloy composite material for a piston and a preparation method thereof. According to the high-temperature wear-resistance high-strength aluminum alloy composite material for the piston and the preparation method thereof, the problem that a piston head is easy to crack due to the fact that the strength is insufficient under a high-temperature working condition. The material composed of a substrate and reinforcing phases; the substrate alloy comprises, by weight, 11.0-16.0% of silicon, 3.0-5.0% of nikel, 2.0-4.0% of cooper, 0.5-2.0% of magnesium, 0.5-1.5% titanium and the balance aluminum; and the reinforcing phases are Al2O3 particles generated through an in-situ reaction. The preparation method of the high-temperature wear-resistance high-strength aluminum alloy composite material for the piston comprises the following steps that raw materials are weighed by mass percentage; industry pure aluminum, crystalline-silicon, copper, nickel, magnesium and titanium are smelted at the temperature of 750-900 DEG C; the materials are cooled down to 540-600 DEG C at the speed of 20 DEG C/min, and (Al and B2O3) powder with the temperature being 200 DEG C is slowly added, ball-milled and preheated ; a piston blank is formed through high-pressure low-speed metal mold casting or squeezing casting; and the poured blank is subjected to T6 heat treatment. According to the high-temperature wear-resistance high-strength aluminum alloy composite material for the piston and the preparation method thereof, at the normal temperature and under normal pressure, production can be conducted through common aluminum alloy smelting equipment.

The invention relates to poly-citrate prepolymer/chitin nano crystal whisker slurry and a preparation method of same. The preparation method includes the following steps: 1) dispersing chitin nano crystal whiskers in a solvent to obtain a dispersant; 2) adding a poly-citrate prepolymer to obtain a mixture solution; 3) performing vacuum freeze drying; 4) adding a solvent with mixing to obtain the poly-citrate prepolymer/chitin nano crystal whisker slurry. During preparation, the solvent can not only cause self-emulsification of the poly-citrate prepolymer but also disperse the chitin nano crystal whiskers. The preparation method is simple. In the slurry, the chitin nano crystal whiskers are adhered to the surfaces of emulsion particles formed by the poly-citrate prepolymer through electrostatic attraction effect, thus assembling a three-dimensional crosslinked network structure. The slurry has characters of non-Newtonian fluids, such as shear thinning, and also shows stress yield duringa dynamic rheologic test. The slurry can be used for producing a porous tissue engineering scaffold as a 3D printing raw material and has great industrial production value.

The invention provides a cast steel and a preparing method and an application of the cast steel. The cast steel comprises the following components in a percent by mass: 0.12-0.22% of C, 0.3-0.6% of Si, 0.8-1.1% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.020% of S, 0.3-0.5% of Cr, 0.35-0.5% of Ni, 0.02-0.06% of Nb and the balance of Fe and unavoidable impurities. By reasonably arranging the adding quantity of alloy, the kinds and content of the added alloy are both few, and the components are easy to control. Therefore, the production cost of the cast steel is low,the content of the S and the P is controlled within the ranges, and the low-temperature toughness of the cast steel can be improved as much as possible. Through the cooperative use of the Cr and the Ni with the content, the cast steel has high impact toughness and can be used for manufacturing the related parts of goods wagons running in the low-temperature environments (-60DEG C) of severe cold regions.

The invention discloses a method for reducing additive manufacturing cracks of nickel-based superalloy and the nickel-based superalloy. The method comprises the steps that nickel-based superalloy powder serves as a raw material and is mixed with Re powder, and forming is conducted through the additive manufacturing technology; wherein the content of the Re powder is 0.5 to 2.0 mass percent. By adding the rare earth element Re, dendritic grains of the nickel-based high-temperature alloy subjected to heat treatment are finer, gamma'phase in the nickel-based alloy is precipitated and separated out, a matrix is strengthened, the mechanical performance of the alloy in a high-temperature state is promoted to be greatly improved, and therefore the nickel-based high-temperature alloy is widely applied to high-temperature severe places such as turbine engines.

The invention discloses a method for preparing an Al-Mg3Sb2 composite coating on the surface of magnesium alloy. After being mixed, Mg powder and Sb powder are ball-milled in a ball milling machine, so that Mg chemically reacts with Sb to form an Mg3Sb2 intermetallic compound, Mg3Sb2 powder and granulated Al powder are thermally sprayed to the surface of a magnesium alloy workpiece subjected to sandblasting treatment, and the Al-Mg3Sb2 composite coating is obtained; after the Al-Mg3Sb2 composite coating is heated, the coating is hot-pressed on a press machine. The Mg powder and the Sb powder have a solid-phase reaction in the ball milling process to generate the Mg3Sb2 intermetallic compound, Mg3Sb2 melting point is high, heat stability is good, dislocation movement can be effectively hindered, a substrate and a grain boundary are remarkably reinforced, and high-temperature mechanical properties and creep resistance of the workpiece are improved. Pores and layered structures in the thermally sprayed Al-Mg3Sb2 composite coating disappear in the hot press process because the composite coating plastically deforms and is compacted, compactness of the coating is remarkably improved, and the high-temperature mechanical properties and creep resistance are given full play to.

The invention relates to an Fe-Mn-Al-Ni-Nb shape memory alloy and a preparation method thereof. The Fe-Mn-Al-Ni-Nb shape memory alloy comprises 20%-43% of Mn, 13.50%-20% of Al, 7%-14% of Ni, 0.50%-2%of Nb, and the balance Fe. The preparation method comprises the steps: directly smelting industrial pure iron, electrolytic aluminum, electrolytic nickel and niobium iron in an induction furnace, andcompletely melting; adding ferromanganese, mixing alloy melt, and cooling to the room temperature along with the furnace to obtain a cast ingot; homogenizing the cast ingot in a vacuum furnace to obtain a treated cast ingot; and preserving heat of the cast ingot at 1250 DEG C for 30-60 min, then cooling to 900 DEG C for heat preservation for 30-60 min, repeatedly preserving heat at 1250 DEG C and900 DEG C for 2-10 cycles of heat treatment, and water quenching to the room temperature. According to the Fe-Mn-Al-Ni-Nb shape memory alloy and the preparation method thereof, the intracrystalline precipitation is promoted by the Nb, and a matrix is strengthened; the grain growth driving force is improved, and the as-cast sample has recoverable strain of more than 1.8% after heat treatment.

The invention provides a heat treatment composite process and die steel obtained according to the heat treatment composite process. The heat treatment composite process comprises the following steps of S1 tissue pretreatment: before shipping a die steel raw material from a factory, adopting a tissue pretreatment method which comprises the following steps of in a first stage, heating the die steelraw material in a vacuum environment to 550 DEG C and performing thermal insulation for 30 minutes, heating again to 850 DEG C and carrying out thermal insulation for 60 minutes, continuously heatingthe die steel raw material to 1150 DEG C and then performing thermal insulation for 60 minutes, introducing liquid nitrogen in the die steel raw material in the vacuum environment, and quenching the heated die steel raw material; and in a second stage: heating the die steel raw material obtained through the treatment in the previous procedure to 720 DEG C, then performing thermal insulation for 60minutes, and tempering to room temperature; S2 conventional quenching; and S3: placing the die steel raw material obtained through the treatment in the step 2 in a low temperature environment of -150to -200 DEG C for 15-24 hours for cryogenic treatment. By using the heat treatment process, the service life of die steel can be prolonged.

The invention relates to compound rare earth modification agent used for heat-resistant and anti-fatigue steel, and the agent belongs to addition agent applied to an alloy steel material. The invention is characterized in that the chemical components include the content (mass percentage ratio) that: RE occupies 15 to 17 percent (therein, Y occupies 50 to 71.1 percent of the mass of RE, and La+Ce+Pr+Nb+Sm+Eu+Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu occupies 28.9 to 50 percent of the mass of RE), B occupies 0 to 10 percent, Nb occupies 0 to 17 percent, V occupies 0 to 6 percent, Ca occupies 0.5 to 15 percent, Ba occupies 0 to 15 percent and the residual is iron. The modification agent is block shaped grey alloy, the grain size scope is 0.5 to 50 mm, and the melting point scope is 1200 to 5000 DEG C. The modification agent is used to perform refining modification treatment to the material, and the anti-fatigue performance of the parts can be obviously enhanced, thereby lengthening the service life of the alloy suffering cold and heat alternating load function.

The invention discloses a high-strength high-hardness high-chromium cast iron plate hammer and a preparation method thereof. The high-strength high-hardness high-chromium cast iron plate hammer comprises the following chemical components by mass percent: 23.4-29.8% of Cr, 4.2-5.6% of Ni, 1.2-1.8% of Mo, 1.8-2.6% of Si, 3.2-4.0% of C, 0.25-0.45% of Mn, 1.4-2.2% of Zr, 1.0-1.5% of Ti, 0.3-0.7% of Ta, 0.5-1.0% of Mg, 0.4-0.6% of Cu, 0.3-0.5% of Al, 0.05-0.1% of Nd, 0.03-0.06% of Er, 0.03% or less of S, 0.06% or less of P and the balance Fe. The cast iron plate hammer prepared through the preparation method is good in comprehensive property, high in mechanical strength, hardness and abrasion resistance, low in cost, durable in use, and wide in market prospect, and is safe and reliable; and the production technology is simple and is high in efficiency.

The invention belongs to a sacrificial anode protection material of a reinforced concrete structure, in particular, a zinc alloy sacrificial anode material for a reinforced concrete structure in a chlorine salt erosion environment. In order to solve problems in a sacrificial anode material in the prior art, the following technical schemes of the invention are adopted, the sacrificial anode material of the invention comprises the following components in percentage by mass: 0.5% of Al; 0.1% of Cd; 0.18%-0.36% of La; 0.42%-0.84% of Ce; 0 to 0.1% of impurities; and the balance of Zn. The zinc alloy sacrificial anode material provided by the invention has the advantages of good activation performance, uniform corrosion, good corrosion resistance and long service life, and meets the use requirements of reinforced concrete. The zinc alloy sacrificial anode material is excellent in electrochemical performance, and the current efficiency reaches about 95%. The surface corrosion product of the zinc alloy sacrificial anode material is likely to shed.