43results about How to "Avoid brittle cracking" patented technology

The invention discloses a high-temperature resistant turbine blade. The turbine blade comprises the following chemical components in percentage by weight: 0.19-0.21% of C, 0.55-0.57% of Mn, 0.20-0.22% of Si, 0.38-0.40% of Al, 0.30-0.32% of V, 0.40-0.42% of Ti, 0.12-0.14% of Ni, 0.06-0.08% of Sn, 0.25-0.27% of Zr, no more than 0.025% of S, no more than 0.025% of P, no more than 0.20% of Cu, 0.20-0.22% of lanthanide serial rare earth, and the balance Fe. The invention further designs a production process of the turbine blade. The production process has the advantages of simplicity and low cost, helps to largely improve the impact toughness of the blade, enhance the high temperature resistance of the blade and prolong the service life of the blade through the nitridation surface treatment.

The invention provides a turbine blade capable of enhancing impact toughness, which comprises the following chemical components in percentage by mass: 0.13-0.15% of C, 0.8-0.9% of Si, 0.5-0.8% of Mn, 14-16% of Cr, 0.1-0.3% of Ni, 1.3-1.5% of Cu, 0.6-1.1% of Mo, 0.1-0.15% of W, 0.36-0.45% of V, 0.5-0.8% of Nb, 0.28-0.30% of Al, 0.16-0.18% of Ti, 0.08-0.10% of B, 0.45-0.48% of Na, at most 0.02% of S, at most 0.03% of P, 0.3-0.6% of rare-earth metal and the balance of Fe. The invention also provides a production technique of the turbine blade capable of enhancing impact toughness. The production technique can greatly enhance the impact toughness of the blade and prolong the service life of the blade.

The invention discloses a dual-component room-temperature cured type waterproof building adhesive and belongs to the technical field of adhesives. The dual-component room-temperature cured type waterproof building adhesive disclosed by the invention is prepared from a component A and a component B, wherein the component A is prepared from epoxy resin, modified unsaturated polyester resin, linseedoil microcapsule and filler; the component B is prepared from a curing agent, a coupling agent and an accelerating agent; the filler is prepared from graphene oxide, modified sea-foam stone powder andmodified microcrystalline cellulose; the component A and the component B are separately packaged to form the dual-component room-temperature cured type waterproof building adhesive. The dual-component room-temperature cured type waterproof building adhesive disclosed by the invention has excellent waterproofness.

The invention discloses a turbine blade capable of improving the thermal cracking resistance. The turbine blade comprises the following chemical components in percentage by mass: 0.31-0.35% of C, 0.10-0.12% of Si, 0.75-0.77% of Mn, 0.63-0.65% of Ni, 11.2-11.7% of Cr, 0.65-0.68% of Mo, 0.16-0.18% of V, 0.85-0.88% of Sr, 0.15-0.17% of Nb, 0.05-0.07% of Cu, 0.27-0.29% of Al, 0.13-0.15% of Ti, 0.06-0.08% of B, less than or equal to 0.02% of S, 0.21-0.35% of rare earth metal and the balance of Fe. By adopting the turbine blade, the impact toughness of a blade is greatly improved, the thermal cracking resistance of the blade is improved, and the service life of the blade is prolonged.

The invention discloses a marine high-strain welded steel pipe based on a double-phase structure and a preparing method thereof. The marine high-strain welded steel pipe is made by a wide and thick steel plate having the double-phase structure, the steel grade of the high-strain welded steel pipe is L485MO, the thickness is larger than or equal to 25.4mm, the width of the steel plate is pi(1-epsilon)D-2t, D refers to the outer diameter of the steel pipe, t refers to wall thickness, epsilon refers to a cold expanding rate, the radius-to-thickness ratio is smaller than or equal to 30, the yield-to-strength ratio Rt0.5/Rm is smaller than or equal to 0.85, A is larger than or equal to 25%, and UEL is larger than or equal to 7%. The manufactured steel pipe has the characteristics of high strength, high tenacity, high strain capability, low yield-to-strength ratio, low strain aging influence, H2S corrosion resistance, large wall thickness, small radius-thickness ratio, high diameter precision, small outer diameter error and small out-of-roundness error, can fully meet the technical requirements of marine service on the high-strain thick-walled delivery steel pipe, can be used for deep-sea oil and gas exploitation and saves marine development cost.

The invention belongs to the technical field of coal mill equipment, and particularly relates to a high-efficiency ceramic grinding roller and a ceramic lining plate. A grinding mechanism with the relative movement function is formed by the ceramic grinding roller and the ceramic lining plate. The ceramic grinding roller comprises a grinding roller base body, an adhesive layer and a composite ceramic layer. The ceramic lining plate comprises a lining plate base body, an adhesive layer and a composite ceramic layer. Materials of the composite ceramic layers are formed by one or more of silicon carbide, silicon nitride, tungsten carbide, aluminum oxide and zirconium oxide in a compounded mode. The adhesive layers are adhesives resistant to high temperature and high in viscidity. The grinding roller base body and the lining plate base body are made of metal. The composite ceramic layer of the ceramic grinding roller is formed by splicing ceramic modules. Gaps capable of increasing the surface friction force of ceramic are formed between the ceramic modules. The high-efficiency ceramic grinding roller and the ceramic lining plate are simple in structure, reasonable in design, high in hardness, long in service life, economical, practicable and easy to apply and popularize on a large scale, and the cost is reduced.

The invention provides a turbine blade capable of enhancing water corrosion resistance, which comprises the following chemical components: 0.26-0.28% of C, 0.13-0.15% of Si, 0.75-0.77% of Mn, 0.63-0.65% of Ni, 10.5-10.7% of Cr, 0.65-0.67% of Mo, 0.16-0.18% of V, 0.82-0.84% of Sr, 0.15-0.17% of Nb, 0.05-0.07% of Cu, 0.24-0.26% of Al, 0.13-0.15% of Ti, 0.06-0.08% of B, at most 0.03% of S, at most 0.03% of P, 0.12-0.15% of rare-earth metal and the balance of Fe. The production technique can greatly enhance the impact toughness of the blade, enhance the water corrosion resistance and corrosion resistance of the blade and prolong the service life of the blade.

The invention discloses a high-silicon gradient silicon steel thin strip and a preparation method thereof. The steel thin strip comprises the following components in percentage by mass of 0.001 to 0.08% of C, 4.5 to 6.5% of Si and the balance of Fe and inevitable impurities, and has the thickness of 0.1 to 0.35mm, the width of less than or equal to 1000mm, the magnetic induction intensity (B8)/T of 1.25-1.56, the iron loss P10/400 of 5.1-12 W/kg, the strength of 470-720MPa and the ductility of 2.5-10%. During preparation, a silicon steel thin strip raw material is taken and subjected to surface treatment, and is sequentially subjected to preheating and reduction operation at a specific temperature, first-stage siliconizing treatment is conducted, second-stage siliconizing and annealing treatment is conducted after annealing, cooling is conducted to the room temperature at a specific cooling speed, and the high-silicon-gradient silicon steel thin strip is prepared. According to the process, an ultra-thin low-silicon steel thin strip is used as an initial raw material, brittle cracking in the high-silicon steel rolling process is avoided, a high-silicon concentration gradient thin strip product with the consistent Si content or the gradually-reduced Si content on the surface and the core can be prepared, and the prepared silicon steel thin strip has excellent overall performance.

The invention discloses a rock shear strength tester which comprises a longitudinal pressure device and a horizontal pressure device. Two vertically symmetrical rock fixing boxes are arranged below the longitudinal pressure device, the horizontal pressure device corresponds to the side surface of the upper rock fixing box, and the rock fixing box is a square box with openings at the opposite innersides. A limiting plate is arranged in the middle in each rock fixing box, a plurality of square supporting columns longitudinally penetrate through the limiting plate and are arranged on the limiting plate in a matrix mode, longitudinal threaded holes are formed in the square supporting columns and are in threaded connection with the threaded columns at one end, and one end of each threaded column extends out of the bottom of the rock fixing box and then is rotationally connected with the bottom of the rock fixing box. The rock shear strength tester has the characteristics that the structureis simple, the cost is low, the rock is firmly fixed, an experiment is not easy to fail, and the experimental results are more accurate.

The invention provides an electroplatable polycarbonate composition and a preparation method thereof. The polycarbonate composition is mainly prepared from the following raw materials in parts by mass: 20-85 parts of polycarbonate resin, 10-80 parts of organosilicone/polycarbonate copolymer, 0.2-10 parts of ethylene/methyl acrylate copolymer, 0.3-10 parts of styrene/maleic anhydride-grafted rubber polymer and 0.2-2 parts of a hyperdispersant. The polycarbonate composition provided by the invention is good in ultralow-temperature cracking resistance, electroplating corrosion cracking resistance and embedded steel sheet stress cracking resistance; an electroplated layer is high in binding force; plated pieces are good in quality.

The invention discloses an anti-corrosion steam turbine blade, which includes a blade root, a blade shape and a blade crown, and the blade root, the blade shape, and the blade crown are connected in sequence, and the blade shape includes an air inlet edge, an inner arc, an air outlet edge and an outer edge. The air guide groove and the dehumidification groove are arranged on the airfoil, one end of the air guide groove is located on the air inlet side, and the air guide groove is from the air inlet side to the air outlet side, and one end of the dehumidification groove is located between the blade shape and the air outlet side. At the joint of the leaf crown, the dehumidification tank is close to the air outlet edge, the dehumidification tank is from the leaf crown to the blade root, the remote end of the air guide groove communicates with the end of the dehumidification tank, and the dehumidification tank on the leaf crown corresponds to A through hole is opened at the end of the groove. In the anti-corrosion steam turbine blade provided by the invention, the water droplets produced by the liquefaction of high-temperature steam are thrown out from the through hole on the blade crown along the dehumidification tank, so as to prevent the water droplets from being located on the blade shape for a long time to cause the blades to be eroded by the water droplets.