31results about How to "Strength advantage" patented technology

The invention discloses a composite negative-stiffness energy absorption honeycomb structure and a preparation method thereof, and relates to a composite negative-stiffness energy absorption honeycombstructure. The problems that the number of times of reutilization of an existing negative-stiffness is small, strength is low, and the energy absorption effect is poor are solved. The design philosophy of a composite is used for design of the negative-stiffness structure, two materials of combining a soft material and a hard material are adopted for constructing the negative-stiffness through thecharacteristics that the stress features of all parts are different and stress distribution is not uniform in the deformation process of the negative-stiffness, and the aims of reducing weight and improving the mechanical performance of the structure are achieved on the basis of guaranteeing high-frequency reutilization. Preparation of the composite negative-stiffness honeycomb structure is completed mainly through the additive manufacturing technology such as the SLS technology, the FDM technology and the SLM technology. A new direction is provided for improving energy absorption of metamaterials. The composite negative-stiffness energy absorption honeycomb structure is applied to the field of metamaterials.

The invention discloses water-borne wood paint and a preparation method. The water-borne wood paint is prepared from, by weight, 60-80 parts of acrylic emulsion, 30-50 parts of polyurethane water-borne dispersion, 1-40 parts of padding and 0.1-10 parts of auxiliaries. Compared with the prior art, the water-borne wood paint has the advantages that the paint film hardness and the abrasion resistance are greatly improved, the abrasion resistance is close to the oil paint level, the ubiquitous problem that water paint defoaming is hard is solved, and the water-borne wood paint further has the advantages that the leveling property is good, the paint film is full and attractive, and construction is easy.

The invention discloses a high-strength and high-plasticity hot-rolled strip steel with a tensile strength of 1180 MPa, which belongs to the field of hot-rolled high-strength steel. 1.3-2.0%, Al: 1.2-2.0%, P≤0.015%, S≤0.005%, Re: 0.003-0.006%, Nb: 0.02-0.07%, Ti: 0.02-0.07%, Cr: 0.03-0.08%, The balance is Fe and inevitable impurities. Compared with the prior art, the present invention is used for the production of parts and components such as commercial vehicles and trucks, and is beneficial to the high-strength thinning and plastic forming of the parts.

The invention provides a method for carrying out enhanced treatment on a metal material surface through a laser machine. An IPG pulse optical fiber laser device is used for carrying out surface enhanced treatment on the metal material, the treated metal material has the high strength and is not prone to damage, in the use process, corrosion resisting is achieved, producing and manufacturing are convenient, the manufacturing cost is low, and mass production is easy; the method for carrying out enhanced treatment on the metal material surface can be specifically applied to castings like a mold core, due to the fact that the mold core made of a hard alloy is difficult to machine, a mold core of common steel is cut, punched and formed, the laser machine is used for enhancing the metal materialsurface, machining is convenient, the mold core strength is high, and through coating of multiple layers of metal coatings, strength, wear resisting, and corrosion resisting have more advantages compared with those of mold cores made of a single alloy.

The invention discloses a cooling section flat tube used for a platinum channel in the substrate glass production process and a preparation method thereof, comprising: N sections of flat tube components; adjacent flat tube components are connected by flanging welding, and the flanging is used to form Reinforcing ribs; each flat tube assembly includes: a flat tube top plate and a flat tube bottom plate; the flat tube top plate is arched, and the flat tube bottom plate is a flat plate with both sides bent upwards for connecting with the flat tube The top plate is welded; the top plate of the flat tube is connected to the bottom plate of the flat tube by butt welding; wherein, N is an integer greater than or equal to 3, and the material of the flat tube in the cooling section is a platinum-rhodium alloy. The invention can prevent the collapse and deformation of the top of the flat tube during production and use.

The invention provides a water-permeable cement concrete reinforcing agent which comprises the following components by total weight: 75-85% of EVA emulsion, 1.5-3% of a thickening agent, 0.1-0.3% of a defoaming agent, 0.5-1.3% of a water reduction agent and 10-30% of water, wherein the EVA emulsion is ethylene-vinyl acetate copolymer emulsion; the content of vinyl acetate is greater than or equal to 15%; the thickening agent is a hydrophilic high-molecular compound; the defoaming agent is an organic silicon compound. Due to adoption of the thickening agent, the dispersibility and the adhesion property of the cement can be improved, the water amount can be reduced, the strength and the properties of water retention, reinforcement, thickening and adhesion improvement of concrete at different stages can be improved, the cohesive force of water-permeableconcrete skeletons can be improved, good construction can be ensured, and the communication porosity of water-permeable cement concrete structure layers can be ensured.

The invention discloses an efficient and specific promoter of skeletal muscle cells and application of the efficient and specific promoter. According to the efficient and specific promoter disclosed by the invention, the nucleotide sequence is shown as any one of SEQ ID NO.1, SEQ ID NO.2 and SEQ ID NO.3. The invention further discloses a recombinant vector and / or recombinant bacterium containing the promoter and application thereof. The expression efficiency of the efficient and specific promoter of the skeletal muscle cells in in-vitro and in-vivo experiments is higher than that of CMV (Cytomegalovirus) and high expression of target genes can be realized; the promoter SP-301 has remarkable advantages in the aspects of strength, specificity and lasting time of promoter gene expression in skeletal muscles, and has a very great potential in a subsequent gene therapy field.

A heat exchanger includes a block for the separated and heat-exchanging guiding of first and second fluids, the block having a number of fluid flow channels, at least one box which is flow-connected to the flow channels, and at least one base that includes one or more openings for feeding the flow channels from the box. At least one opening is formed as a passage with a collar having a near-bottom section and an end-side section, and a wall thickness of the end-side section is smaller than a wall thickness of the near-bottom section. A shoulder between the near-bottom and end-side section has a contour running transverse to the contour of the near-bottom section and / or the end-side section, and the end-side section is inclined away from a passage axis. Also a manufacturing process for a heat exchanger.

The invention discloses a high-performance concrete composite admixture and a preparation method thereof. The high-performance concrete composite admixture is prepared from the following raw materials in parts by mass: 30-60 parts of waste residues, 10-16 parts of tailings, 1-2 parts of desulfurization gypsum, 5-12 parts of powder and 1-5 parts of an activating agent. The invention also discloses the preparation method of the high-performance concrete composite admixture. The high-performance concrete composite admixture disclosed by the invention has the following beneficial effects: firstly, the raw materials of the admixture are taken from wastes to realize recycling utilization of solid wastes and solve land occupation and environmental pollution caused by stacking and burying; secondly, the admixture disclosed by the invention, by virtue of treatment and processing of the raw materials, has more excellent performance, so that the working performance and strength of each stage of concrete can be finally promoted significantly, and then the concrete becomes high-performance concrete with high durability, high applicability and high volume stability; and moreover, the admixture can greatly reduce the use level of cement and is very significant in cost reducing effect.

The invention relates to the technical field of electric vehicles, in particular to a lightweight electric vehicle body skeleton, which comprises a left side body frame, a right side body frame, a roof and a front glass bracket which are all made of carbon fiber reinforced composite materials, wherein the left side body frame and the right side body frame are respectively assembled with the roof and the front glass bracket in a cementing manner and a bolt fastening manner to form a space cage-shaped tubular body skeleton, each of the four large blocks takes an edge combining area as a piece dividing line and is further divided into an inner piece and an outer piece, and the inner pieces and the outer pieces are connected at the edge combining areas in a cementing manner. The application form of composite materials to the vehicle body is improved from the past single sided board into a double sided tubular space structure, a passenger protecting area is designed into a space cage-shaped skeleton structure, the overall strength of the body skeleton is improved through utilizing the structure characteristics of tubular columns and topological spaces, in addition, the forming efficiency is also considered by adopting the four-large-block and eight-small-piece designing method, and the forming quality is also effectively ensured.

The invention discloses a formula of a composite material for an automobile interior part. The formula consists of the following materials in percentage by weight: 40 to 60 percent of polylactic acid fiber and 40 to 60 percent of natural fiber. The production method of the invention comprises the following steps: uniformly mixing the raw materials; putting the mixture into an opener for opening, combing and shaping the obtained product, feeding the product into a lapping machine for cross lapping and feeding the cross-lapped product into a needling machine for needling to form a felt; immersing the fiber felt into a processing slurry; drying the immersed coiled material through hot blast and cutting the dried material into pieces of required size; placing the cut material into a mould for curing and shaping by heating; demoulding the material to form a composite plate; and softening the composite plate by flat panel heating, covering the plate with a surface decorative layer and performing cold molding on the plate through a product mould to manufacture the finished product finally; or softening the cut fiber felt by the flat panel heating directly, covering the plate with the surface decorative layer and performing the cold molding to manufacture the finished product finally. The composite material for the automobile interior part of the invention has the advantages of no toxicity, no pollution, simple processing technique, small energy consumption and high environment protection performance.

The invention relates to a method for preparing a TiAl-based composite material reinforced with a network structure titanium-silicon alloy phase. The method refers to prealloying 65% to 85% of Ti-46Al-2Cr-2Nb powder in terms of mass fraction With 15%~35% Ti 5 Si 3 The powder is mechanically mixed, vacuum hot-pressed and sintered, and cooled at room temperature to obtain a network structure Ti 5 Si 3 Reinforced TiAl-based composites. The preparation process of the present invention is simple, the cost is low, and the product performance is stable, and the prepared network structure Ti 5 Si 3 Reinforced TiAl-based composites have high compressive strength and excellent anti-wear properties, and can be used as new structural and anti-wear materials.

The invention relates to a Ti-5Mo-5V-6Cr-3Al titanium alloy extruded tubular product and a processing method thereof. The titanium alloy extruded tubular product comprises the main alloy elements by weight percentage: 4.5%-5.7% of Mo, 4.5%-5.7% of V, 5.5%-6.5% of Cr, 2.5%-3.5% of Al, and the balance titanium. The tubular product is prepared on a large-tonnage extrusion machine; and because the tubular product has higher tensile strength, higher toughness and good welding performance, the tubular product can be widely applied in aviation, aerospace, petroleum, chemical industry and other fields.