594results about How to "Meet the mechanical performance requirements" patented technology

The invention relates to a 690MPa-yield-strength low-yield-tensile-ratio antiseismic steel and a manufacturing method thereof, belonging to the technical field of architectural structural steel. The antiseismic steel comprises the following chemical components: 0.05-0.13wt.% of C, 0.00-0.50wt.% of Si, 1.50-2.50wt.% of Mn, less than 0.012wt.% of P, less than 0.006wt.% of S, 0.15-0.50wt.% of Mo, 0.02-0.12wt.% of Nb, 0.00-0.15wt% of V, 0.01-0.025wt.% of Ti, 0.0010-0.0030wt.% of B, 0.01-0.06wt.% of Al and the balance of Fe and inevitable impurities. On such basis, one or more of the following alloy elements are added: 0.00-0.80wt% of Cu, 0.00-0.50wt% of Cr and 0.00-1.00wt% of Ni. The total addition amount of the alloy elements in the steel is not greater than 5%. A heavy and medium plate mill is utilized to perform controlled rolling and controlled cooling to obtain the fine-grain bainite-martensite structure; and two-phase region secondary isothermal heat treatment is combined to obtain a certain amount of metastable austenite/microalloy precipitate enhanced substrate; the antiseismic steel satisfies the requirements for mechanical properties of 690MPa-yield-strength architectural antiseismic design code, can be used in an antiseismic structure, and can also be used in the field of engineering machinery.

The invention discloses a smelting process of castings of wind energy equipment, which is suitable for the smelting production of castings of wind energy equipment with the wall thickness of 60 to 200mm and includes the following steps: a. new pig iron, scrap steel and carburants with special requirements are sent into a melting electric furnace for smelting; b. high temperature liquid iron is subjected to desulfurization treatment by a desulfurization agent; c. the desulfurized liquid iron is returned into a heat insulation electric furnace for component adjustment, and the carburant is added for carrying out pre-treatment of crystal nucleus to graphite in the liquid iron; d. spheroidization treatment is carried out to the liquid iron; e. an inoculant is added into the liquid iron for inoculation; f. the liquid iron is poured to casting sand mold; and g. the castings are naturally cooled to 500 to 550 DEG C for unpacking after finishing pouring. The smelting process of castings of wind energy equipment can increase the spheroidization efficiency of ductile iron castings used by the wind energy equipment, which causes the castings to have good intensity of tension, extensibility and high impact ductility in low temperature environments, thus meeting the requirements on the castings used by the wind energy equipment.

The invention discloses a method for modifying graphene oxide by controllable synthetic amination with amine based compounds and prepared graphene oxide nano material with antibacterial and anticoagulant functions. The method utilizes Brodie method, Hummers method, or Staudenmaier method to prepare graphene oxide, does not conduct post-treatment to reaction liquid, adds amine based compounds intothe reaction liquid for reaction, prepares amine activated graphene oxide intermediate product, and disperses by ultrasonic the intermediate product in alkaline solution to obtain graphene oxide withantibacterial and anticoagulant functions. The invention introduces amine based compounds into graphite oxide laminate. The amine based compounds can be acid-capturer in the reaction liquid of the synthesis process and promoter in controllable decomposition of graphite oxide laminate, and can make the prepared graphene oxide have antibacterial and anticoagulant functions.

The invention discloses polyvinyl alcohol/inorganic nanocomposite hydrogel, which is characterized by being formed by the following components: 30-90 parts by weight of polyvinyl alcohol and 0.1-20 parts by weight of inorganic nanocomposite particles through a chemical crosslinking gel method, wherein the inorganic nanocomposite particles comprise nano clay, nano mica powder, a nano molecular sieve, nano wollastonite, nano graphite, nanosilicon dioxide or a carbon nano tube. With the adoption of the polyvinyl alcohol/inorganic nanocomposite hydrogel, the mechanical strength of polyvinyl alcohol hydrogel is enhanced on the basis of not influencing the moisture of the hydrogel, the service life is prolonged, the permeability of the polyvinyl alcohol hydrogel is improved, and a channel is reserved for transmission of matters. As the selection of the materials, the production cost is controlled, and the better economic benefit is brought. The invention also discloses a preparation method of the polyvinyl alcohol/inorganic nanocomposite hydrogel. The preparation method is simple and feasible to operate and good in mechanical strength, and can be produced industrially.

The invention relates to a method for producing Al-Mn-Zn-Sc aluminum alloy foil for an automobile radiating fin by continuous roll casting. The method is characterized by comprising 0.05 to 0.15% by mass of Sc, 0.44 to 0.58% by mass of Si, 0.45 to 0.55% by mass of Fe, 0.10 to 0.15% by mass of Cu, 1.05 to 1.25% by mass of Mn, less than or equal to 0.05% by mass of Mg, 1.40 to 1.60% by mass of Zn, less than or equal to 0.025% by mass of Cr, less than or equal to 0.045% by mass of Ni, less than or equal to 0.045% by mass of Ti, less than or equal to 0.045% by mass of Zr, and the balance Al. The method has the advantages of short production technological process, simple production processes, high production efficiency, high yield, low cost, good plate shape, high Al-Mn-Zn-Sc aluminum alloy foil strength, good toughness, good weldability, good thermostability, high heat resistance and stable and reliable product quality.

The invention relates to silk fibroin/ cellulose 3D printing ink, which comprises the following main ingredients: water-soluble silk fibroin with good biocompatibility, non-water soluble cellulose micron/ nanometer materials with good biocompatibility, non-toxic polyhydric alcohols capable of inducing the silk fibroin to carry out physical crosslinking, bioactive substance capable of accelerating tissues to regenerate, and water. The silk fibroin/ cellulose 3D printing ink disclosed by the invention has high viscosity, dynamic viscosity is 1000-5000cP, curing molding speed is high, self-gelation time is 0.5-3min, printing conditions are moderate, and printing temperature is 25-37DEG C; an obtained printing bracket has high precision and good mechanical property, a resolution ratio is 50-300mum, and a modulus of compression is 10-50MPa. The bracket formed by the silk fibroin/ cellulose 3D printing ink can be used for the field of the repairing and the reconstruction of various damaged tissues or organs of a human body.

The invention relates to polyving alcohol composite hydrogel and a preparation method thereof. The polyving alcohol composite hydrogel is prepared from the following raw materials in parts by weight through cross-linking solidifying compounding of boric acid solution containing solidifier: 30 to 90 parts of polyving alcohol, 0.1 to 50 parts of sodium alginate, 0.1 to 20 parts of inorganic nanoparticles, 1 to 20 parts of elastomer material, 0.5 to 5 parts of coupling agent and 200 to 2000 parts of water, wherein the degree of polymerization of polyving alcohol is 400 to 3000, and the alcoholysis degree is 75 to 99 percent. The polarity elastomer material and the inorganic nanoparitcles which are processed through the coupling agent are compounded with the polyving alcohol, the mechanical strength and flexibility of the polyving alcohol hydrogel can be improved through the toughening effect of the elastomer material and the synergistic effect of the inorganic nanoparticles, so that the service life is prolonged, and the requirement of the real application on the mechanical performance can be met; the preparation method of the polyving alcohol composite hydrogel is simple in process, easy to operate and applicable to the mass production.

This invention discloses a cast iron material for piston inlay ring, which comprises: N 0.0005-0.2 wt.%, C 2.0-3.6 wt.%, Si 1.1-3.5 wt.%, Mn 2.8-9.0 wt.%, Ni 1.2-13.5 wt.%, Cu 1.1-8 wt.%, Cr 0-2.3 wt.%, Ti 0-2 wt.%, Mo, 0-2 wt.%, V 0-2 wt.%, Zr 0-2 wt.%, Al 0-2 wt.%, P less than or equal to 0.2 wt.%, S less than or equal to 0.2 wt.%, and Fe as balance. The cast iron material is prepared by: mixing the above components, smelting in an electric furnace, incubating, and pouring into a mold to obtain roughcast for casting inlay ring. The tensile strength (deltab), bending strength (deltabb) and Brinell hardness of the cast iron material are greater than or equal to 130 MPa, greater than or equal to 300 MPa and HB 120-170, respectively. The cast iron material has such advantages as low Ni content; lwo cost and high wear resistance, and can satisfy the mechanical property requirements of piston inlay ring of high-performance engine.

The invention relates to a method for using compost to decay straw to make plant pot. Wherein, it comprises breaking straw into sections; emerging with water; adding nitrogen and phosphor fertilizers; grafting compost product to decay, breaking, screening and adding additive to obtain pot material; compressing and shaping the material, then removing the mould. The inventive pot has strong flexibility. And its surface can be emerged by acrylate emulsion, to be used in plant cultivation. And the invention uses temperature-different demould technique or lift demould technique, to reduce the cost.

The present invention relates to a textile type artificial blood vessel with double-layer machine-woven structure. It is characterized by that it includes outer layer machine-woven structure whose water permeability is 1000-3000 ml/sq.cm.min.16kPa and inner layer machine-woven structure whose water permeability is 250-300 ml/sq.cm.min.16kPa, and adopts stitching warp or stitching weft to make the above-mentioned outer layer machine-woven structure and inner layer machine-woven structure be combined together so as to obtain the invented artificial blood vessel.

The present invention provides one kind of woven artificial blood vessel in double layer structure. The woven artificial blood vessel includes one woven outer layer and one inner layer of nanometer fiber. The woven artificial blood vessel can prevent blood permeation during surgical operation, is favorable to smooth growth of cell tissue to its inside after operation, and has high mechanical strength enough for being crinkled and being handled in operation.

The invention provides hot-rolled ferrite-bainite dual-phase steel and a production process thereof, belonging to the field of high-strength punching steel. The hot-rolled dual-phase steel comprises, in weight percent, 0.09 to 0.10% of C, 0.01 to 0.4% of Si, 1.3 to 1.4% of Mn, no more than 0.012% of P and no more than 0.006% of S, with the balance being Fe and other impurity elements. The production process comprises the following sequential steps: heating, insulation, rough rolling, finish rolling, post-rolling cooling and reeling. The dual-phase steel in the invention has the advantages of a yield strength greater than 340 MPa, a tensile strength greater than 450 MPa, good matching of strength and plasticity, good fracture performance and capacity of meeting requirements for mechanical properties of 450 MPa grade ferrite-bainite hot-rolled dual-phase steel.

The invention discloses a polyamide composite material for a vehicle induction manifold. The polyamide composite material comprises the following raw materials in percentage by weight: 40-70 percent of polyamide 6, 1-10 percent of low-fusion point polyamide, 1-5 percent of compatilizer, 0.2-5 percent of composite heat stabilizer, 0.5-5 percent of lubricant and 20-40 percent of reinforcement component. Meanwhile, the invention discloses a preparation method of the polyamide composite material for the vehicle induction manifold. The composite material has good heat-resistant performance and heat fusion performance and is especially suitable for preparing workpieces of vehicle induction manifolds; moreover, the preparation method is simple, adopts traditional equipment, and is suitable for industrial production.

The invention relates to a high-strength thick steel plate with an excellent crack-arrest property. The steel plate has the following characteristics: a wide-plate tensile value Kca for determining the crack-arrest property is larger than 6000 N/mm<1.5>; yield strength at the positions, which are respectively 1/4 and 1/2 the thickness of the steel plate away from the surface of the steel plate, isno less than 460 MPa; tensile strength is 570 to 720 MPa; Charpy impact energy at minus 40 DEG C is no less than 200 J; and a zero-ductility transition temperature is less than minus 60 DEG C. The steel plate provided by the invention comprises the following components by weight: 0.04 to 0.16% of C, 0.1 to 0.5% of Si, 0.9 to 1.6% of Mn, 0.1 to 0.3% of Cu, 0.2 to 0.9% of Ni, no more than 0.02% ofP, no more than 0.02% of S, 0.01% to 0.05% of Als, 0.002 to 0.010% of N, 0.02% to 0.05% of Nb and 0.01 to 0.03% of Ti, with the balance being Fe and unavoidable impurities. According to the invention,through optimization of chemical components of a high-strength steel plate and adoption of controlled rolling and controlled cooling processes for controlling the microscopic structure and grain sizein a plate thickness direction, the crack-arrest steel plate with high yield and stable strength and toughness is obtained. The high-strength thick steel plate provided by the Invention is used as container vessel steel, and has the characteristics of excellent crack-arrest toughness, high yield strength, excellent low-temperature toughness and large thickness.

The invention belongs to the technical field of polymer composite materials, and relates to a polypropylene composite material and its preparing method and uses. The polypropylene composite material comprises the following components by weight: 40-93 parts of co-polypropylene, 5-60 parts of alkali free glass fiber, 1-6 parts of a compatible agent, 0.1-0.6 part of an antioxidant, 0.1-0.3 part of a light stabilizer, 0.6-1 part of a radiation sensitizing agent and 0-5 parts of an additive. Through cooperation of the functional additives, the high-strength, high-toughness and weather resistant composite material for building templates can be prepared, and the polypropylene composite material can be used for the preparation of various building templates and other outdoor equipment due to its excellent comprehensive properties.

The invention relates to a cold rolling method for a hard stainless steel band, which comprises the following steps: selecting a stainless steel band blank; using a four-roller finishing rolling mill unit to carry out primary rolling on a 3mm-thick stainless steel band into a 1.6mm-thick semi-finished stainless steel band, carrying out intermediate annealing and finish rolling, rolling the 1.6mm-thick semi-finished stainless steel band into a 0.8mm-thick finished stainless steel band, and cutting the finished stainless steel band to a user-required width; and finally, inspecting, packaging, and warehousing. The stainless steel band has favorable form and extremely high hardness which can be up to 400 degrees or above. By arranging the annealing procedure prior to the finish rolling procedure, the invention eliminates the internal stress generated in the primary rolling process, improves the performance quality of the finished product and meets the requirements for mechanical properties of the finished product, thereby being widely used in the high-technology fields of IT industry, submarines, aircrafts and the like.

The invention discloses high-heat-conductivity high-corrosion-resistance cast aluminum alloy and a preparation method thereof. The high-heat-conductivity high-corrosion-resistance cast aluminum alloycomprises the raw material components of, by weight, 7-9% of Si, 0.6-1.0% of Fe, 0.2-0.6% of Zn, 0.1-0.5% of Co, 0.05-0.15% of B, 0.2-0.5% of RE, 0.05-0.2% of Sr and the balance Al. In the preparationprocess, the aluminum alloy containing the elements of Si, Fe and Co is melted at the high temperature at first, and then is subjected to still standing and cooled; pure Zn, Al-RE intermediate alloy,Al-B intermediate alloy and Al-Sr intermediate alloy are added into the melt for further alloying; and the melt is subjected to refining and slag removal, and molding is achieved through casting. According to the alloy preparation process, the technology effect is remarkable, the Co, B, Sr and RE multi-element compound synergistic effect is sufficiently realized, and thus, the alloy casting piecehas the excellent heat conductivity, high mechanical property and good corrosion resistance.

The invention relates to a casting process of a nodular cast iron planet carrier, which comprises the following procedures of modeling, iron melt melting, spheroidizing, modifying, casting and stress relieving and annealing. The design of a casting system adopts a step casting method which takes consideration of both bottom casting and top casting to improve the finished product rate of castings, and also adopts technical schemes of placing chill iron at the position of thick walls, adding Sn element in the iron melt, optimizing, spheroidizing, modifying, casting and the like, so that the produced planet carrier not only meets the high demands on property, but also achieves great improvement in production cost and efficiency.