68results about How to "Improved resistance to crack growth" patented technology

A multiphase polymeric material comprises a first rigid continuous phase and a second elastic phase dispersed in the first phase. The multiphase polymeric material may be formed into polymeric strips and used to make a cellular confinement system which is suitable for use in cold areas.

The invention discloses a novel weathering resistant steel microalloying compound core-spun yarn comprising a steel sheath and a powdery inner core, wherein the powdery inner core is composed of the following chemical ingredients in percentage by weight: 20% of Ca, 0.5% of Mg, 38% of Si, 1.2% of Ba, 1.9% of rare-earth metal, 3.2% of Zr, 1.6% of Ti, 0.5% of B, 0.9% of Mo, 0.5% of Mn, 0.9% of Nb, 0.6% of V and the balance of Fe and inevitable impurity. The invention can obviously refine steel microstructure, improves the decay resistance of steel and lowers C, P and S content in steel by reasonably designing the chemical ingredients; and meanwhile the invention can reduce the amount of parts of alloy elements in steel so as to lower cost.

A power transmission belt or hose or other dynamic article with an elastomeric body comprising a rubber composition that includes an ionomeric polymer additive, such as an ethylene-methacrylic acid copolymer or a butyl ionomer. The rubber body exhibits improved crack growth resistance over the same body composition without the ionomer additive.

The invention provides a wear-resistant and oxidation-resistant high-entropy alloy coating and a preparation method thereof. The alloy coating comprises, by mass, 15-21% of Fe, 15-21% of Co, 26-35% ofCr, 15-21% of Ni, 11-18% of Nb, 1-6% of Si, 0.1-1.2% of C, and 1-2% of CeO2. The coating is prepared by adopting a preset powder method and a coaxial powder feeding method. The preset powder method comprises the steps of weighing Co, Cr, Fe, FeNb, FeSi powders, FeCrC powders and CeO2 powders according to target coating components; uniformly mixing and drying at 80-150 DEG C for 1-4 hours; uniformly pre-spreading dried mixed powders on the surface of a substrate, wherein the thickness is 0.6-1.3 mm; and then laser cladding the powders on the surface of the substrate to form the wear-resistantand oxidation-resistant high-entropy alloy coating. The coaxial powder feeding method comprises the steps of firstly preparing alloy powders by adopting a smelting gas atomization method according tothe content of Co, Cr, Fe, Nb, Si and C in the coating; uniformly mixing the alloy powders with the CeO2 powders, and drying at 80-150 DEG C for 1-4 hours; putting the dried powders into a powder feeding cylinder; feeding the powders by adopting nitrogen protection; and laser cladding the powders on the surface of the substrate to form the wear-resistant and oxidation-resistant high-entropy alloycoating.

This invention relates to a type of midst-carbon and low-alloy steel which used for wheel of light super-speed railroad train. Account for weight it includes : 0.40-0.50%C 0.20-0.70%Si 0.50-0.80%Mn 0.20-0.30%Cr 0.015-0.035%Als S<=0.02% P<=0.02%,the rest is Fe and impurity element. The invention lowers the carbon inside steel, increases the Si, and adds trace quantity Al and Cr. Compared with the background technology, this invention has better property but lower cost.

The invention belongs to the technical field of novel polymer functional materials, and discloses a stretchable hydrogel based on a modified silica nanoparticle cross-linking agent and a preparation method and application thereof. The method specifically comprises the following steps: uniformly mixing sodium alginate, acrylamide, the modified silica cross-linking agent, N, N-methylene bisacrylamide and an initiator in water, and carrying out radical polymerization to obtain a final product. The method successfully prepares a novel modified silica reinforced double network structure hydrogel (alginate/polyacrylamide). The prepared silica cross-linking agent grafted with PAMAM on the surface has strong hydrogen bonds with polymer chains, and the addition of the silica cross-linking agent remarkably improves the mechanical strength of the hydrogel while maintaining good elongation. At the same time, due to the adoption of the double network system, when the double network hydrogel undergoes tensile deformation, stress concentration can be effectively relieved, and crack propagation resistance can be increased.

The invention belongs to the technical field of graphene/rubber nanometer composite materials, and relates to an erosion-resistant fluorine rubber nanometer composite material with graphene and a method for preparing the erosion-resistant fluorine rubber nanometer composite material. The erosion-resistant fluorine rubber nanometer composite material comprises, by weight, 100 parts of fluorine rubber, 0.1-15 parts of graphene, 0.5-20 parts of carbon black, 0.5-20 parts of carbon fibers, 3-7 parts of oxide or hydroxide acid acceptors, 2-5 parts of peroxide or bisphenol vulcanizing agents, 0.2-7parts of assistant cross-linking agents and 0.5-5 parts of silane coupling agents. The erosion-resistant fluorine rubber nanometer composite material and the method have the advantages that pre-dispersion treatment is carried out on the graphene by the aid of ball milling processes, accordingly, the dispersibility of the graphene in the fluorine rubber can be improved, the erosion resistance of the fluorine rubber can be effectively improved, erosion loss can be reduced by 62% as compared with fluorine rubber without graphene, the erosion loss further can be reduced by 43% as compared with fluorine rubber which is not subjected to pre-dispersion treatment and is directly additionally provided with graphene, and the erosion resistance can be obviously improved.

The invention discloses a cantilevered roller and a manufacturing method thereof. The cantilevered roller is prepared from the following chemical components by weight percent: 0.30-0.39% of C, 1-2% ofMn, 1-1.8% of Si, 27-29% of Cr, 47-49% of Ni, 4-6% of W, 0.25-0.35% of S, 0.3-0.5% of P, and the balance of Fe and unavoidable impurities. The manufacturing method can solve the problems that in theprior art, the cantilevered roller is poor in performance and shorter in service life.

The invention relates to grade-E series ship plate steel and a preparing method thereof and belongs to the technical field of ship plate steel. According to the grade-E series ship plate steel , the occluded foreign substance grade of the grade-E series ship plate steel is not higher than 1.5 grade, the banded structure grade of the grade-E series ship plate steel ranges from 3.0 grade to 4.0 grade, and the central grain size of the metallographic structure of the grade-E series ship plate steel is not smaller than 9.0 grade. The occluded foreign substance grade, the banded structure grade andthe grain size of the metallographic structure of the grade-E series ship plate steel are limited to form many carbide particles, the grain-boundary strength of the grade-E series ship plate steel isremarkably improved, the structure toughness is improved, crack growth is weakened, and the nil-ductility transition temperature of the grade-E series ship plate steel is reduced and is not higher than minus 40 DEG C.

The invention discloses a PVC (polyvinyl chloride) profile for anti-cracking impact-resistant back net reinforcing ribs, which comprises a PVC substrate and a reinforcing agent. The reinforcing agent is composed of the following components in parts by weight: 5-10 parts of high-efficiency impact modifier based on acrylic ester polymer, 0.5-1 part of organotin stabilizing agent, 1-1.5 parts of light calcium carbonate, 0-0.5 part of active calcium, 0.05-0.1 part of toughener, 3 parts of chlorinated polyethylene, 0.08 part of oxidized wax, 0.3 part of polyethylene wax, 0.6-0.9 part of organic wax and 0.1-0.3 part of modifier. Ethyl silicate and heat-resistant pigment and filler are added into the modifier. The heat-resistant pigment and filler comprises nano smectite silicate and blocking functional filler in a mass ratio of 1.5:1:1. Compared with the prior art, the PVC profile for anti-cracking impact-resistant back net reinforcing ribs effectively reduces the problem of cracking of the reinforcing ribs due to long-time usage, and enhances the cracking resistance and impact resistance of the reinforcing ribs.

The invention discloses an ultra-fine grain hard alloy and a preparation method thereof. The ultra-fine grain hard alloy is mainly prepared from the following raw materials in percentage by mass: 5%-8% of binding phase powder, 0.20%-0.80% of Cr3C2 powder, 0.25%-0.80% of Ru powder and 90.40%-94.55% of ultra-fine WC powder. According to the preparation method, all the raw materials are subjected to batching, ball milling, granulation, pressing and sintering, and the hard alloy is prepared. The Cr3C2 and the Ru are compositely added, so that the hardness of the alloy is ensured, the micromechanical property of a binding phase of the ultra-fine hard alloy is improved, the crack propagation resistance and the high-temperature oxidation resistance of an alloy material are obviously improved, and the binding wear resistance of the hard alloy is obviously improved; and the technical problem that turning machining of common high-temperature alloy materials in the fields of spaceflight, aviation, automobiles, ships and the like is difficult is solved.

A system and method for modifying an article to increase resistance to crack propagation are disclosed. The method includes providing a system, positioning one or more lasers, and directing a predetermined energy to a topographical feature on a surface of an article.

The invention relates to the field of lead storage battery plastic shells, particularly to an anti-corrosion high-toughness lead storage battery plastic shell, which comprises an organic-inorganic composite plate arranged on the inner side of the plastic shell, and a plastic shell body covering the outer side of the organic-inorganic composite plate, wherein the plastic shell body comprises the following components in parts by weight: 80-100 parts of an ABS resin, 10-25 parts of organic resin toughened glass fiber, 3-10 parts of chlorinated polyethylene, 10-15 parts of a flame retardant, 1-5 parts of a flame retardant synergist, 1-3 parts of a compatilizer and 0.1-0.5 part of a lubricant, and the organic-inorganic composite plate comprises the following components in parts by weight: 100 parts of glass micro-sheet, 35-50 parts of flaky cubic boron nitride, 15-30 parts of an epoxy resin and 0.05-0.1 part of a curing agent. According to the invention, the defect that the mechanical property of the lead storage battery is continuously reduced along with the prolonging of the service time due to the fact that the lead storage battery in the prior art is not corrosion-resistant is overcome, the lead storage battery has good toughness and impact resistance, the corrosion resistance is good, and the use safety of the plastic shell can be ensured for a long time.

The invention discloses a zirconium diboride and short carbon fiber modified thermal shock resistant and ablation resistant SiBCN ceramic material and a preparation method thereof, and relates to a SiBCN ceramic material and a preparation method thereof. The invention aims to solve the problem of poor thermal shock resistance and poor ablation resistance of SiBCN ceramic at present. The SiBCN ceramic material disclosed by the invention is prepared by compounding SiBCN, short carbon fiber and ZrB2. The preparation method comprises the following steps: performing ball milling of silica powder, graphite powder, hexagonal boron nitride powder and zirconium diboride powder to obtain nano SiBCN-ZrB2 powder; compounding the SiBCN-ZrB2 powder with short carbon fiber, then performing dispersion andball milling to obtain ceramic slurry; finally, drying, levigating and sintering in turn to finish the preparation. According to the preparation method disclosed by the invention, by modifying SiBCNwith ZrB2 and Cf, the prepared SiBCN ceramic has excellent thermal shock resistance and ablation resistance, and the temperature interval of high-temperature service of the SiBCN ceramic material is expanded. The preparation method disclosed by the invention is suitable for preparing SiBCN ceramic.