252results about How to "Improve room temperature strength" patented technology

The invention belongs to the technical field of graphene composite materials and relates to a titanium-based nanocomposite material reinforced through graphene and a preparation method, in particularto a graphene-reinforced titanium-based nanocomposite material and a preparation method. Firstly, oxidized graphene nanosheets of 0.01 wt%-1.0 wt% of titanium alloy powder are weighed to be added intoabsolute ethyl alcohol to be stirred and mixed, then disperse treatment is conducted through an ultrasonic cell pulverizer, and an oxidized graphene solution is prepared; then the titanium alloy powder with the alloying element content being larger than 10 wt% and the oxidized graphene solution are stirred and mixed under inert protection, and oxidized graphene and titanium alloy powder compositepowder is obtained; and finally, the composite powder is loaded into a graphite mold to be sintered, through vacuum pumping and sintering forming, oxidized graphene is basically decomposed to form graphene, and therefore the graphene-reinforced titanium-based nanocomposite material with the excellent mechanical property is prepared. In the graphene-reinforced titanium-based nanocomposite material, the graphene is uniformly dispersed, and the preparation method is simple, efficient and suitable for batch preparation.

The invention discloses a preparation method of a heat-resisting alloy sliding-block shell by investment casting. The preparation method is characterized in that: the method comprises a first step of preparing coating, wherein surface coating comprises silica sol and a refractory powder material is fused alumina; and transition layer coating and back layer coating comprise the silica sol and a refractory powder material is one selected from the fused quartz, kaolin clinker and bauxite clinker; a second step of coating a wax mould with the surface coating, scattering the sand material of the fused alumina, drying and repeating for 2 times; coating the surface layer with the transistion layer coating, scattering one of the fused quartz, the kaolin clinker and the bauxite clinker, drying, and repeating for 5 times; and finally coating with a back layer coating, scattering one of the fused alumina, the kaolin clinker and the bauxite clinker and drying; and a third step of dewaxing and calcinating; and the shell produced by the method has advantages of high room-temperature strength and high-temperature strength, good internal surface quality, high percent of pass, low production cost and good economic benefit.

The invention discloses a high-strength aluminum alloy subjected to carbonitride complex treatment and a preparation method thereof. The alloy comprises the following components in percentage by weight: 2.0-3.2 percent of Cu, less than or equal to 0.2 percent of Mn, 0.2-0.5 percent of Mg, less than or equal to 0.01 percent of Cr, less than or equal to 0.01 percent of Ni, less than or equal to 0.1 percent of Zn, less than or equal to 0.15 percent of Ti, less than or equal to 0.5 percent of Si, less than or equal to 0.5 percent of Fe, and the balance of Al and inevitable trace impurities, wherein the carbonitride MX(C,N)Y is 0.05-2.5 percent of total mass of the furnace burden. The aluminum alloy has the characteristics of high strength and good casting performance.

The invention provides high-performance and high-nitrogen austenitic stainless steel for a non-magnetic drill collar and a manufacturing method thereof, and belongs to the technical field of stainless steel. The stainless steel comprises components in percentage by weight as follows: larger than or equal to 21.5% and smaller than or equal to 22.5% of Cr, larger than or equal to 0.5% and smaller than or equal to 1.5% of Mo, smaller than or equal to 0.040% of C, larger than or equal to 0.65% and smaller than or equal to 0.75% of N, larger than or equal to 0.40% and smaller than or equal to 0.50% of Nb, larger than or equal to 1.95% and smaller than or equal to 2.05% of Ni, larger than or equal to 16.0% and smaller than or equal to 17.0% of Mn, smaller than or equal to 0.20% of Si, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S and the balance of Fe, wherein the sum of weight percentage of Cr, a product obtained by multiplying the weight percentage of Mo by 3.3 and a product obtained by multiplying the weight percentage of N by 16.0 is larger than or equal to 33.0%. The manufacturing method of the high-performance and high-nitrogen austenitic stainless steel comprises the steps as follows: smelting by an electric furnace, argon oxygen decarburization for secondary refining, electroslag remelting, cogging by a fast forging machine, forming by a radial forging machine and water cooling treatment. The high-performance and high-nitrogen austenitic stainless steel for the non-magnetic drill collar has the advantages of good room-temperature strength as well as excellent spot corrosion resistance and intercrystalline corrosion resistance.

The invention belongs to the magnesium alloy material field and particularly relates to a high strength and toughness rare earth magnesium alloy. The invention solves the defects of low strength and plasticity of the Mg-Al base alloy which is widely used now. The alloy comprises the following elemental compositions by weight percent: 3-9% of Al, 0.2-0.6% of Zn, 0.1-0.5% of Mn, 0.05-1.0% of Ce, 0.05-1.0% of La, 0.1-3.0% of Y, 0.1-2.0% of Er, 0.1-2.0% of Ho, 0.004% or less of impurity element Fe, 0.002% or less of impurity element Cu, 0.02% or less of impurity element Si, 0.001% or less of impurity element Ni and the balance Mg. Through combined action of the elements and proper homogenizing treatment, the comprehensive performance of the alloy is significantly improved.

The invention discloses a castable for a ladle deslagging plate, and a preparation method and an applicable of the castable. The castable for the ladle deslagging plate comprises the following components in parts by weight: 50-70 parts of mullite, 10-20 parts of andalusite, 10-20 parts of bauxite powder, 3-5 parts of pure calcium aluminate cement, 4-6 parts of aluminum oxide micropowder, 3-5 parts of silicon carbide micropowder and 2-3 parts of compound additive, wherein the compound additive is a combination of two or more of organic fiber, steel fiber, and sodium tripolyphosphate or sodium hexametaphosphate. When the castable is cast on the outer surface of the ladle deslagging plate, the service life of the ladle deslagging plate can be prolonged and the preparation cost can be reduced; and the preparation method of the castable for the ladle deslagging plate is simple, and easy to operate.

The invention discloses a paint formula, particularly discloses a lost foam steel-casting paint formula and a technology method thereof. The lost foam steel-casting paint formula comprises the following components: 40-60% of bauxite, 30-50% of zirconium sand powder, 1-3% of phenolic resin, 1-5% of white emulsion, 1-5% of silica sol, 1-5% of lithium bentonite, 0.1-0.5% of isopropanol, 0.5-2% of CMC and 0.1-0.5% of JFC. The technology method of the lost foam steel-casting paint formula comprises the following steps: 1, in the ratio of paint powder to water of 1:0.7, putting the paint powder and the water into a stirrer for stirring for 1-1.5 hours, then measuring baume degree, and controlling the baume degree between 65 and 70 through dilution with water; 2, according to production requirements, dip-coating for two times or three times; and 3, the thickness of a coating layer being 1-2 mm. White molds of the paint formula have good wettability, good coating and hanging properties, high strength and good air permeability.

The present invention discloses a silicon sol adhesive modified by using high polymer and its preparation method. Its composition comprises alkaline silicon sol containing 20-30%, SiO2 and PVA whose content is less than [(32-100XSiO2%)/320]X100%. Its preparation method includes: a. preparing PVA aqueous solution; b. preparing alkaline silicon sol solution; and c. mixing said two solution uniformly, in which after the alkaline silicon sol solution is prepared or after the two solutions are mixed uniformly its pH value must be regulated. Said silicon sol adhesive can accelerate drying speed when it is used in investment casting industry, and can raise the normal temp. strength of pattern shell in the investment casting, and can reduce retained strength.

The invention discloses a coating formula and particularly discloses a formula and technique of a full-mould casting coating. The formula of the full-mould casting coating contains 30-40% of bauxite, 40-50% of quartz powder, 10-20% of flake graphite, 1-3% of lithium-based bentonite, 0.5-1.5% of phenolic resin and 2-4.5% of polyvinyl butyral. The technique of the full-mould casting coating comprises the following steps of: according to different products to be painted, diluting the full-mould casting coating to the required viscosity, density or baume degree by adopting industrial alcohol, and fully and uniformly stirring before the full-mould casting coating is used, and painting a casting once or twice. The full-mould casting coating is better in suspension stability, low in gas evolution and high in crack resistance.

The invention discloses a glaze-crawling-proof protection coating for an immersion type water gap slag line and a preparation method of the glaze-crawling-proof protection coating. The coating is prepared from a main material, water and dextrin; the main material is prepared from the following components in percentage by weight: 62 percent to 66 percent of tabular corundum, 15 percent to 17 percent of Suzhou clay, 3 percent to 5 percent of bentonite, 12 percent to 16 percent of active aluminum oxide and 0.5 percent to 1 percent of sodium silicate; the weight ratio of the water to the dextrin to the main material is (31 to 33):(0.6 to 0.8):100. The glaze-crawling-proof protection coating disclosed by the invention can be used for effectively preventing an anti-oxidization coating of the immersion type water gap slag line part from generating glaze crawling, so that the strength and anti-corrosion performance of the immersion type water gap slag line are improved, and the service life of an immersion type water gap can be prolonged for 2.5 hours to 3.5 hours.

The invention discloses a heat-strength damage-tolerant titanium alloy and a preparation method thereof. According to the mass percentage, the alloy contains the following components: 5.8-7.2% Al; 2.8-3.8% Mo; 1.6-2.5% Nb; 1.6% -2.5Sn; 1.6-2.5% Zr; 0.15-0.25% Si; the rest is Ti. The alloy preparation method includes: batching and electrode pressing, electrode preparation, preparation of primary ingot, preparation of secondary ingot, preparation of casting ingot, and finally the casting ingot is required to be cooled to below 200°C after smelting is completed. The high-temperature strength and fracture toughness of the parts produced by the titanium alloy obtained by the preparation method of the present invention are significantly higher than those of the currently used TC11 heat-strength titanium alloy at 350° C. to 550° C. TC11 heat-strength titanium alloy is in an order of magnitude, and has higher room temperature strength and better hot-working processability. These properties broaden the application range of the titanium alloy and its parts in aero-engines, improve the use efficiency, reduce the cost, and have good application prospects.

The invention discloses a magnesia castable and a production process of a slag baffling component for a tundish. The magnesia castable comprises the following raw materials in parts by weight: 70-95 parts of magnesia consisting of magnesia aggregate and magnesia fine powder, 4-15 parts of silica, 5-30 parts of waste magnesia-chrome brick consisting of waste magnesia-chrome brick aggregate and waste magnesia-chrome brick fine powder, 2-10 parts of silicon dioxide micropowder, 0.1-0.5 part of a composite additive, 0.01-0.1 part of organic fiber and 0.1-1 part of steel fiber. The slag baffling component for the tundish, which is produced from the magnesia castable provided by the invention, is long in service life, resistant to molten steel erosion, resistant to slag erosion and good in anti-peeling performance.

The invention belongs to the field of refractory matters for ferrous metallurgy and in particular relates to an Al2O3-SiC-C refractory brick for a torpedo ladle produced by utilizing a waste Al2O3-C material and a preparation method of the Al2O3-SiC-C refractory brick. The Al2O3-SiC-C refractory brick comprises the following raw materials in percentage by weight: 10-40% of special grade bauxite clinker particles with the particle size of 3-5mm, 10-30% of special grade bauxite clinker particles with the particle size of 1-3mm, 5-20% of alundum particles with the particle size of 0.088-1mm, 5-20% of corundum fine powder with the particle size of less than 0.088mm, 2-8% of silicon carbon particulates with the particle size of 0.088-1mm, 2-8% of silicon carbon fine powder with the particle size of less than 0.088mm, 10-25% of waste Al2O3-C material fine powder with the particle size of less than 0.088mm, 5-15% of alumina micro powder with the particle size of less than 0.088mm, 3-10% of binding clay fine powder with the particle size of less than 0.088mm, 1-10% of crystalline flake graphite powder with the particle size of less than 0.088mm, 0.5-5% of asphalt powder with the particle size of less than 0.088mm, and 4-8% of additional phenolic resin.

The invention relates to novel powder high-temperature alloy and preparing method thereof. The novel powder high-temperature alloy comprises, by weight percent, 14.00 to 15.00% of Cr, 14.50 to 19.50%of Co, 4.5 to 5.5% of Mo, 3.25 to 4.10% of Ti, 2.50 to 3.10% of Al, 1.45 to 2.50% of Ta, 0.55 to 1.55% of Hf, 0.045 to 0.068% of Zr, 0.005 to 0.030% of C, 0.006 to 0.023% of B, 0.002 to 0.030% of P, 0.01 to 2.0% of Re, 0.1 to 2.0% of W, 0.1 to 1.0% of Nb, smaller than 0.5% of Y, smaller than 0.3% of V, smaller than 0.5% of Fe, smaller than 0.15% of Si, smaller than 0.12% of Mn, and the balance Ni.The gamma' phase content in the l powder high-temperature alloy is about 40 to 50%. The novel powder high-temperature alloy prepared through the preparing method has the good room temperature strength, high temperature strength and high temperature creep properties, and the use temperature is up to 750 DEG C.

The invention discloses a 1100 MPa level thermal strength titanium alloy and a preparation method thereof. The alloy comprises the following components by weight percent: 5.8-7.2% of Al, 2.8-3.8% of Mo, 1.6-2.5% of Nb, 1.6-2.5% of Zr, 0.20-0.30% of Si and the balance of Ti. The preparation method comprises the following steps: dosing, performing electrode pressing and electrode preparation, preparing primary ingots, preparing secondary ingots, preparing cast ingots, cooling, discharging, and the like. The performances such as room temperature strength and high temperature strength of the titanium alloy parts prepared from the titanium alloy disclosed by the invention are obviously higher than those of titanium alloy parts prepared from the existing TC11 thermal strength titanium alloy; and the performances such as plasticity and impact of the titanium alloy parts and the same performances of the TC11 thermal strength titanium alloy are in the same order of magnitude. In addition, the preparation method of the titanium alloy with excellent performances is simple and is easy to operate while the excellent performances are ensured.

The invention belongs to the field of materials and particularly relates to a heat insulation material. The heat insulation material is prepared by: a), mixing raw materials and water, and beating toobtain pulp, wherein the raw materials include inorganic fibers, organic fibers, newspaper, an organic binder and an inorganic binder, the inorganic fibers include one or more of ceramic fiber, basaltfiber and quartz fiber, and the organic fibers include polyethylene fiber and/or polypropylene fiber; b), mixing the pulp with a flocculating agent to obtain flocculated pulp; c), dewatering the flocculated pulp, and calcining to obtain the heat insulation material. The components in the heat insulation material are tightly combined together, showing excellent sealing performance and mechanical strength, with no picking occurred during use.

The invention discloses high-thermal-conductivity die-casting magnesium alloy and a preparation technology thereof. Chemical components of the high-thermal-conductivity die-casting magnesium alloy comprise, by mass, 8-13% of Zn, 0.1-1% of Ca, 0-1% of Mn, 0-1% of La, 0-1% of Ce and the balance Mg, wherein the content of Mn, the content of La and the content of Ce are not zero at the same time. The magnesium alloy is suitable for die casting and has excellent mechanical properties and high thermal conductivity, the thermal conductivity of the magnesium alloy at room temperature can reach about two times that of commonly used die-casting AZ91, and the tensile strength of the magnesium alloy is similar to that of AZ91 magnesium alloy.