50results about How to "High mechanical strength" patented technology

A semiconductor device includes at least three or more wiring layers stacked in an interlayer insulating film on a semiconductor substrate, a seal ring provided at the outer periphery of a chip region of the semiconductor substrate and a chip strength reinforcement provided in part of the chip region near the seal ring. The chip strength reinforcement is made of a plurality of dummy wiring structures and each of the plurality of dummy wiring structures is formed to extend across and within two or more of the wiring layers including one or none of the bottommost wiring layer and the topmost wiring layer using a via portion.

A polystyrene-based resin composition containing a styrene-based resin with mainly syndiotactic configuration, a polyamide, and a rubber polymer as main components. Styrene-based resins of mainly syndiotactic configuration include polystyrene, poly(alkylstyrene), poly(halogenated styrene), poly(alkoxystyrene), styrene copolymers comprised of polymerized units of at least of styrene, alkylstyrene, halogenated styrene and alkoxystyrene, and mixtures thereof

Provided are a polyimide tube including a polyimide resin composition, wherein the polyimide resin composition contains a polyimide resin in which an acicular highly thermally conductive filler such as carbon nanotubes is dispersed in 15 volume percent or more relative to the total volume of the composition; the acicular highly thermally conductive filler has an orientation of 1.3 or more, the orientation being represented by the modulus of elasticity of the polyimide resin composition in the circumferential direction/the modulus of elasticity of the polyimide resin composition in the axial direction; and the polyimide tube has high thermal conductivity, is excellent in terms of mechanical strength and indentation strength, and provides a high fixing property and an excellent offsetting property; a process for producing such a tube; and a fixing belt including such a tube serving as a base member.

The invention provides an irradiation crosslinking flexible corrosion-resistant low-smoke halogen-free composition as well as a preparation method and application thereof. The irradiation crosslinking flexible corrosion-resistant low-smoke halogen-free composition is prepared from the following raw materials in parts by weight: 10 to 15 parts of ethylene-vinyl acetate copolymer, 10 to 15 parts of flexibilizer, 15 to 20 parts of super-tough elastomer, 40 to 50 parts of magnesium hydroxide for chemical surface treatment, 0.7 to 1.5 parts of coupling aid, 3-6 parts by weight of an antioxidant, 2-3 parts by weight of a cross-linking agent, and 4-6 parts by weight of a lubricant. The invention also provides a preparation method of a cable. The irradiation crosslinking flexible corrosion-resistant low-smoke halogen-free composition can be used as a cable of an electric vehicle charging pile. The irradiation crosslinking flexible corrosion-resistant low-smoke halogen-free composition disclosed by the invention is high in temperature resistance grade and resistant to environmental corrosion.

A production method for a sintered valve guide includes preparing a raw powder which is primarily made of an iron powder and which includes at least a copper alloy powder and a graphite powder. The production method further includes compacting the raw powder into a green compact having an approximately cylindrical shape and sintering the green compact at 950 to 1050° C. The iron powder includes particles, which do not pass through a sieve of 240 mesh, at not less than 40 mass %, and not less than 70 mass % of the powder particles have not more than 0.5 of degree of circularity.

The invention discloses a transformer oil tank. The transformer oil tank comprises a tank box and is characterized in that: the tank body has a bell-jar structure; a plurality of raised corrugations which are parallel to one another are arranged on each tank wall of the tank body; the tank walls are formed through corrugation molding at one time; pipe mouths are formed in the corrugations; and flanges are arranged on the external parts of the pipe mouths. The transformer oil tank is simple in structure, light and handy, attractive in appearance, high in mechanical strength and radiating performance, and good in noise reduction effect, and is convenient to manufacture and maintain.

The invention discloses a method for preparing a coated straw fiber-based water-retaining slow-release fertilizer. According to the method, a straw cellulose polysaccharide chain is used as a framework; acrylic acid and acrylamide substances generated by a reaction of acrylic acid and urea are grafted to a cellulose main chain; then crosslinking is carried out by a cross-linking agent to form a polymer with a three-dimensional network structure; meanwhile, the polymer with the three-dimensional network structure and polyvinyl alcohol interpenetrate through each other to form high-water-absorbing resin with a semi-interpenetrating network structure; then the high-water-absorbing resin with the semi-interpenetrating network structure coats fertilizer particles; and a mixed solution of polyvinyl alcohol, sodium alginate and carboxymethyl cellulose forms a membrane by crosslinking to coat the outermost layer of the fertilizer particles to obtain the coated straw fiber-based water-retaining slow-release fertilizer. The fertilizer disclosed by the invention has good mechanical properties and water absorption performance, has excellent slow release effects on the fertilizer, reduces nutrient loss, improves the utilization rate of the fertilizer, reduces maintenance cost of farmland in the later period, and improves the yield and quality of crops. The method provided by the invention has the advantages that the operation method is simple and convenient, cost is low, the additional value of straw application is improved, and the new idea of straw resourceful utilization is further expanded.

The rolling bearing comprises an inner ring (14), an outer ring (16) and a plurality of rows of rolling elements (18, 20) each arranged between the raceways which are arranged on said rings, the number of rows of rolling elements N rows being in excess of or equal to two. At least one of the inner and outer rings (14, 16) comprises a plurality of part rings (30, 32, 34) which are mounted bearing axially against one another. The number of part rings N rings is defined by N rings N rows + 1.

The invention provides a miniature self-locking structure crystal temperature control device, which comprises a mounting bracket, a middle shell layer and a crystal seat which are sequentially arranged from outside to inside, the mounting bracket is of a hoop type structure, and a first telescopic gap is reserved in the side wall of the mounting bracket; a crystal containing cavity, a first installation groove used for installing a temperature sensor and a second installation groove used for installing a heating element are reserved in the crystal seat, the temperature sensor is externally connected with a PID temperature feedback adjusting circuit, and a second telescopic gap is reserved in the side wall of the middle shell layer. The mounting bracket, the middle shell layer and the crystal seat are respectively made of materials with different linear expansion coefficients, the crystal seat is connected with the middle shell layer through an embedded clamping structure, and/or the mounting bracket is connected with the middle shell layer through an embedded clamping structure. The three-layer structure made of different materials is adopted, the thermal deformation difference of the materials is utilized, and the telescopic gaps reserved in the structural design and the embedded clamping connection mode are combined, so that structural stability under different temperature conditions is achieved.

The invention belongs to the technical field of fluid machinery and engineering devices, and in particular relates to a six-operating-condition bidirectional tide bulb through-flow water turbine by adopting the brand new guide vane molded line and revolving wheel blade thickness regularity of distribution. The turbine comprises a water inlet pipe, a bulb head, a tubular seat, a guide vane, a revolving wheel and an exhaust tube; the shape of the guide vane is designed, and a brand new molded line is adopted, thus the flow is more smooth, and the resistance loss in a flow channel is less; the revolving wheel blade is designed, an S-shaped revolving wheel blade is adopted, a new thickness changing discipline is adopted from the inlet to the outlet, and higher efficiency of the operation of the forward and backward bidirectional water turbine is ensured; and compared with the general tide machine set, the turbine provided by the invention has the advantages that the efficiency of the forward and backward bidirectional water turbine is improved, the vibration and pressure pulsation are reduced, the revolving wheel machinery strength is increased, and the dynamic stress of the revolvingwheel blade is reduced, thus the occurrence of cracking probability of the revolving wheel blade is greatly reduced, and the operation stability of the water turbine is improved.

The invention discloses a fuel cell leveling layer composition and a preparation method thereof as well as a gas diffusion layer. The leveling layer composition comprises a conducting carbon material, an organic pore creating material, a water retention agent, a solvent and a hydrophobing agent, and the mass ratio of the conducting carbon material, the organic pore creating material, the water retention agent and the hydrophobing agent is 1:0.1 to 0.5:0.5 to 10:0.01 to 1. The leveling layer composition can effectively reduce the poriness on the surface of carbon paper, increase the mechanical strength of the gas diffusion layer and reduce the constriction resistance between a leveling layer and a catalyst layer, and the gas diffusion layer containing the leveling layer composition has higher surface smoothness, good ventilation property and water transmissibility, and no fine cracks.

The invention discloses a preparation method of an efficient biofilm forming material, and a preparation method of a biofilm forming filler. The preparation method comprises the following steps: 1) removing surface edges and corners of a weakly magnetic porous material with a particle size of 30-50 mm for later use; (2) adding ferric oxide and potassium hydroxide into 3.5-4.5 cubic meters of wateraccording to a molar ratio of 1:3, uniformly mixing and stirring, and standing for 36-48 h at a temperature of 30-50 DEG C for later use, wherein the total weight of the ferric oxide and the potassium hydroxide is 95-105 Kg; and 3) pouring the weakly magnetic porous material in the step 1) into a water tank, adding the weakly magnetic porous material surface modifier prepared in the step 2) to immerse the weakly magnetic porous material, and after the modifier is circulated for 4 hours, taking out the weakly magnetic porous material, draining, drying in the air, and obtaining the biofilm forming material after modification is completed. According to the invention, the prepared material can change along with the environment, shortens the time for adapting to the environment, has certain mechanical strength, microorganism bearing capacity, specific weak magnetism and natural trace far infrared rays, and can stimulate the activity of microorganisms.

The invention relates to a light elastic fire retardance die block and a preparation method thereof, and belongs to the technical field of fire proofing and blocking. The light elastic fire retardance die block is prepared from, by weight, 150-180 parts of flame-retardant polyether polyol, 25-35 parts of a liquid flame retardant, 1-2 parts of a polyurethane catalyst, 25-35 parts of expanded graphite, 70-105 parts of powder flame retardant, 1-4 parts of a foaming agent, 3-9 parts of a die molding aid and 70-80 parts of diphenylmethane diisocyanate or isophorone diisocyanate. The light elastic fire retardance die block has the advantages that by adding the expanded graphite, the surface of the finished product expands to form a carbon layer to achieve the purposes of blocking and isolating flames and preventing smoke from spreading when the finished product meets a fire at high temperature; a fiberglass gridding cloth is attached in the die block, therefore, carbide falling and collapsing can be prevented from occurring after the die block is burnt, and the mechanical strength of the die block is improved; by adding the die molding aid, the finished product achieves the resilence of soft polyurethane foam, the resilence rate is 30%-40%, irregular holes are easily filled with the die block after the die block is extruded, the random cutting plascicity is high, and the die block can meet the requirements of multiple special working conditions.

The invention discloses an obstructive explosionproof composite and a preparation method thereof. Honeycomb aluminum foil or honeycomb paper foil is used as a structural base material, and after the surface of the structural base material is coated with a coating having corrosion prevention and electric conduction function, the problems that existing metal obstructive explosionproof materials areeasy to corrode and short in use life, and cannot be used in dynamic fuel storage vessels are solved. When the honeycomb paper foil is used as the structural base material, production cost of an existing obstructive explosionproof material system can be substantially reduced, and the obtained obstructive explosionproof composite is suitably applied to large oil material storage vessels, and simultaneously the preparation method of the obstructive explosionproof composite facilitates large area popularization and usage of the obstructive explosionproof composite.

The invention relates to a preparation method of a modified organic silicon resin/silicon carbide compounded abrasive, belonging to the technical field of abrasives. The method comprises the following steps: (1) modifying an organic silicon resin; (2) carrying out chemical vapor deposition to coat a SiO2 nano layer on the SiC powder surface; and (3) by using the SiO2-nano-layer-coated SiC powder as a sand core, mixing in a continuous sand mill. The modified organic silicon resin/silicon carbide compounded abrasive is prepared from non-metal materials. The organic silicon resin is modified to enhance the mechanical strength. The modified organic silicon resin is grafted on the silicon-dioxide-nano-layer-coated silicon carbide powder, thereby integrally enhancing the strength of the abrasive. The compounded abrasive has ideal cleaning effects, and can be recycled, thereby lowering the use cost.