40results about How to "Excellent tensile strength performance" patented technology

The tube (6) comprises a wall which is composed of a plurality of layers (2; 3; 5; 4). Longitudinally extending wires (3) are provided in the wall. At least one layer (2, 4) which is wound over the circumference of the tube (6) is present inside and/or outside with respect to the longitudinally extending wires (3).

The invention discloses a powder metallurgy bearing material. The powder metallurgy bearing material is characterized by being composed of, by weight, 5.2-5.5 parts of tungsten, 2.1-2.3 parts of cobalt, 5.7-5.9 parts of nickel, 1.2-1.5 parts of titanium, 0.2-0.5 part of boron, 72-75 parts of ferrum, 3.2-3.5 parts of silicon, 1.2-1.4 parts of graphite, 1.7-1.9 parts of manganese, 5.2-5.6 parts of chromium, 2.3-2.5 parts of zinc stearate, 1.2-1.4 parts of microcrystalline wax, 0.4-0.5 part of tungsten carbide, 0.2-0.4 part of titanium carbide and 1-2 parts of auxiliary agents. The graphite is added to raw materials of the powder metallurgy bearing material, so that abrasion resistance and lubricity of a bearing are enhanced, and the bearing made of the powder metallurgy bearing material is compact in structure and good in microstructure, has very few holes, and has excellent structural rigidity, hardness, fatigue resistance and tensile strength; addition of the nickel enhances toughness and the elasticity modulus of alloy, thereby playing a prominent role in guaranteeing geometric stability of the bearing.

The invention relates to a composition comprising a prepolymer as component (A), wherein the prepolymer comprises aziridino groups and is characterized by an equivalent weight EW1, a crosslinker as component (B), wherein the crosslinker has a structure being different from the structure of the prepolymer and comprises at least three 2-alkyl-substituted aziridino groups and is characterized by an equivalent weight EW2, an initiator as component (C) being able to start curing of the composition, optionally filler(s) as component (D) and optionally additive(s) as component (E), wherein equivalent weight is defined as (molecular mass of the molecule)/(number of aziridino groups present in the molecule) and wherein EW1>EW2. The invention also relates to the use of the composition for coating, sealing, moulding, adhering, making impressions, producing a dental material.

The invention discloses a powder metallurgy antifriction bearing. The bearing is characterized in that: the bearing is prepared from following raw materials in parts by weight: 0.6-0.8 of graphite, 1.2-1.3 of copper, 2.1-2.3 of silicon, 5.7-5.9 of manganese, 10.2-10.7 of chromium, 0.2-0.3 of molybdenum, 1.2-1.3 of titanium, 0.2-0.3 of titanium diboride, 0.2-0.3 of niobium boride, 0.3-0.4 of V2O5, 2-3 of zinc stearate, 89-91 of waste steel powder and 1-2 of an additive; the graphite is added in the raw materials, thus enhancing the wear resistance and lubricating property of the bearing; the bearing has compact structure, good microstructure, small porosity, and excellent structural stiffness, hardness, antifatigue performance and tensile strength; and the bearing is wear resistant and corrosion resistant, and is low in noise.

The invention discloses a high-aluminum-based composite material applied to automobile bearings. The high-aluminum-based composite material is prepared from the following raw materials in parts by weight: 85-90 parts of aluminum, 5-8 parts of zinc, 3-4 parts of bismuth, 1-2 parts of magnesium, 0.5-1 part of arsenic, 3-4 parts of polytetrafluoroethylene powder, 0.8-1.5 parts of molybdenum disulfide, 2-3 parts of stearic acid, 0.6-1 part of methylcellulose, 1-1.5 parts of graphite, 1.5-2 parts of benzotriazole, 1-1.2 parts of caprolactam, 0.5-0.7 part of phosphorus pentoxide and a proper amount of oleic acid. The high-aluminum-based composite material is few in holes, excellent in structural stiffness, hardness, fatigue resistance performance and tensile strength performance, free of lead, low pollution to environment and simple in production steps; the production efficiency is improved.

The invention discloses powder metallurgy bearing steel and a preparation method thereof. The powder metallurgy bearing steel is prepared from 0.2-0.3 parts by weight of graphite, 0.1-0.2 parts by weight of silicon, 3.1-3.3 parts by weight of manganese, 6.7-6.9 parts by weight of chromium, 0.7-0.9 parts by weight of copper, 0.3-0.4 parts by weight of W2B, 0.1-0.2 parts by weight of SnO2, 0.4-0.45 parts by weight of V2O5, 0.1-0.2 parts by weight of Te, 0.3-0.4 parts by weight of ZrO2, 3.2-3.4 parts by weight of microcrystalline wax, 87-89 parts by weight of iron powder and 1-2 parts by weight of an assistant. Through use of graphite, bearing steel wear resistance and lubricity are improved. The powder metallurgy bearing steel has a compact and good microstructure, less apertures, good structural rigidity, good hardness, fatigue resistance and good tensile strength. The preparation method produces less pollution on the environment, has simple processes and improves production efficiency.

The process for manufacturing a casting for a high-voltage insulator fitting, by casting a ductile cast iron that contains proportionally between 3.2% and 3.7% carbon, between 1.9% and 2.5% silicon, between 0.1% and 0.5% manganese and between 0.04% and 0.08% phosphorus, comprises the following steps: the casting is cast with a greater than 85% degree of nodularization in a mould; and, after removal from the mould, the casting undergoes a two-step ferritization heat treatment whereby the casting is heated at a temperature of between 850 DEG C and 990 DEG C for a time of between 1 and 5 hours and then cooled to a temperature of between 700 DEG C and 800 DEG C for a time of between 2 and 6 hours.

The invention discloses a repair method for an automobile motor rotor and belongs to the technical field of motor part repair. The repair method includes the following steps of material mixing; primary dry-pressing; secondary dry-pressing; sintering; heat treatment; shaping. Graphite is added into raw materials, so that the abrasion resistance and lubricity of the rotor are improved, friction resistance is reduced, the efficiency of a motor is improved, and the density and hardness of the rotor are improved; the motor rotor manufactured from mixed powder in the formula is dense in structure, good in micro-structure, fewer in pore and excellent in structural rigidity, hardness, fatigue resistance and tensile strength; due to the adoption of die pressing, equipment is simplified, and the production cost is reduced.

The invention discloses a powder metallurgy abrasion-resistant corrosion-resistant bearing material. The powder metallurgy abrasion-resistant corrosion-resistant bearing material is characterized in that the powder metallurgy abrasion-resistant corrosion-resistant bearing material is made of the following raw materials of, by weight, 0.4-0.6 part of vanadium carbide, 0.2-0.3 part of chromium carbide, 0.5-0.8 part of graphite, 2.0-3.2 parts of molybdenum powder, 9.4-9.6 parts of nickel powder, 0.15-0.25 part of silicon carbide, 0.2-0.3 part of tantalum carbide, 2-3 parts of polyethylene wax powder, 93-94 parts of iron powder and 1-2 parts of additives. The corrosion-resistant high-temperature-resistant bearing material is made by adding titanium carbide, vanadium carbide, chromium carbide,nickel, molybdenum and graphite, and has the characteristics of being high in hardness, not prone to deforming, high in corrosion resistance, resistant to high temperature, resistant to corrosion andthe like, the structural stiffness, hardness, fatigue resistance and tensile strength performance are excellent, and the powder metallurgy abrasion-resistant corrosion-resistant bearing material is suitable for the high-temperature abrasion environment.

A Ti—Fe-based sintered alloy material including two phases of an α phase and a β phase, in which a content of iron is 0.5% or more and 7% or less on a weight basis, a β phase containing an iron component is dispersed in an independent state in an α phase, an area ratio of the β phase containing an iron component is 60% or less of an entire area, and an equiaxed crystal grain is contained in the α phase.

The invention belongs to the technical field of precision machining, and discloses a preparation method of a gas turbine swirler, which is characterized in that the gas turbine swirler is decomposed into three parts, namely an inner ring, an outer ring and blades, then the inner ring, the outer ring and the blades are independently formed by adopting a machining method, and then the inner ring, the outer ring and the blades are connected by adopting a brazing method. In order to guarantee the brazing quality, a mounting head is machined on the heads of the blades a blade-shaped groove is correspondingly machined in the inner ring, a bayonet is correspondingly machined in the outer ring, then the outer ring, the blades and the inner ring are tensioned through an assembly tool to guarantee that brazing faces are tightly attached, spot welding is used for positioning, and the blades are conveyed into a furnace to be subjected to vacuum brazing after being completed. The roughness of the inner wall of the hollow blade is guaranteed by splitting the structure of the swirler and combining with independent machining, the tensile strength performance of brazing seams between the blades and the inner ring and the brazing seams between the blades and the outer ring is excellent under the room temperature and high temperature environment, the strength performance is better than that of base metal, the performance of the base metal cannot be lost, and the machining period is effectively shortened.