41results about How to "No crack phenomenon" patented technology

The invention relates to a construction process for plugging and consolidating a concrete crack through chemical grouting, which belongs to the technical field of concrete consolidation engineering and in particular relates to a concrete crack plugging and consolidating method. The construction process for plugging and consolidating the concrete crack through the chemical grouting comprises the following steps of the first step, opening a V-shaped groove, which is 20 mm wide at the upper part and at least 20mm deep, along the concrete crack; the second step, flushing the V-shaped groove; the third step, plugging the V-shaped groove; the fourth step, drilling a grouting hole; the fifth step, mounting a grouting head; the sixth step, performing grouting; and the seventh step, removing the grouting head. The construction process for plugging and consolidating the concrete crack through the chemical grouting, provided by the invention, is advantaged in that the grouting process is simple and convenient, the operation of the process is convenient, the crack is closely plugged without a gap, the plugged concrete crack is durable and fatigue-proof and not prone to crack again, the concrete crack plugging effect is good, the concrete surface is completely dry, leakage and moist are avoided, the thickness of a plugging and finishing coating on the surface of the crack is uniform, no missed brushing, no base exposure, no peeling, no swelling and no crack are achieved. And moreover, the process causes no pollution to the environment.

Disclosed is a laser cladding and manual arc welding combined repairing method for an abraded TRT hub. The method includes the six steps of preparation before laser cladding, research of crack problems during cladding, determining of cladding materials, laser cladding, manual welding of the TRT rotor hub, heat treatment, detection and machining. Iron-based self-fluxing alloy powder nickel-boron-silicon alloy serves as the cladding materials. The abraded TRT hub is repaired through the process combining manual arc welding and laser cladding, the repaired TRT hub is free of cracks and high in rate of fusing with raw materials, the abrasion resistance, corrosion resistance and comprehensive mechanical performance of the repaired TRT hub all reach or are higher than those of base metal, and the service life is greatly prolonged. The abrasion resistance of the repaired TRT hub is 1.3-1.5 times that of the raw materials, the corrosion resistance of the repaired TRT hub is 1.5-1.8 times thatof the raw materials, and the service life of the repaired TRT hub is 1.2-1.4 times that of the raw materials. The deformation amount can be controlled within 0.5 mm, meanwhile, heat damage to the base metal is quite small, and the overall mechanical performance is not lower than that of new products.

The invention belongs to the technical field of wear-resistant coating materials, and in particular relates to a cobalt-based spraying powder for aero-engine wear-resistant parts, and also relates to a method for preparing the above-mentioned spraying powder. The composition and weight percentage of the spray powder are: chromium: 20%~30%; nickel: 7%~15%; tungsten: 5%~12%; carbon: 0.1%~1%; cobalt: 45%~65% %; the particle size range of the above spray powder is 5 μm to 45 μm; the coating obtained by using the spray powder is suitable for working at high temperature, and has excellent anti-abrasive wear, hard surface wear, fretting wear and particle erosion wear performance ;After spraying, the bonding strength is high, and it is not easy to fall off; after spraying, the coating has a uniform texture, smooth surface, no delamination and cracks; at the same time, the cobalt content in the material determines that the coating is an excellent anti-oxidation coating; in addition , the powder coating also has good coating grinding and polishing properties and high coating hardness, and can be widely used in the application of engine parts.

The invention relates to a castable material for an aluminum melting furnace. The castable material comprises the following components of 70-88 percent of I-level bauxite, 5-15 percent of clay, 3-10 percent of kyanite and 4-8 percent of binding agent, wherein the I-level bauxite with the grain size of 5-3 mm accounts for 35-45 percent, the I-level bauxite with the grain size of 3-1 mm accounts for 20-30 percent, the I-level bauxite with the grain size of 1-0 mm accounts for 15-25 percent, and the I-level bauxite with the grain size lower than 0.09 mm accounts for 15-25 percent. All the physical performance indexes of the refractory castable material inner lining produced according to the grain size and the mixture ratio are as follows: the breaking strength is 15.6MPa, the compression strength is 41.3MPa, the linear change rate is 0.18 percent, the volume density is 2.81 g.cm, and the actual application shows that all the physical performance indexes can fully meet the requirements of service conditions of the inner lining of the aluminum melting furnace, no crack phenomenon occurs, the problem of alumetizing is eliminated, and the service life can reach more than 4 years.

The invention discloses a collector plate of a vanadium redox battery and a preparation method thereof, and the collector plate of the vanadium redox battery has the characteristic of improving the charging and discharging performances; the collector plate of the vanadium redox battery comprises an electricity-conduction plastic body which is formed by distributing a plurality of electricity-conduction plastic strips at interval, a flow field plate is arranged between the two adjacent electricity-conduction plastic strips, and the height of the electricity-conduction plastic strips and the height of the flow field plate are unequal to form an electrolyte solution groove; the preparation method is that: a. electricity-conduction fillers are added in a thermoplasticity polymer to obtain thermoplasticity electricity-conduction plastic strips; b. the electricity-conduction plastic strips are arranged and fixed at interval; c. epoxide resin or phenolic resin for forming the flow field plate is cast among the electricity-conduction plastic strips; d. solidification. When the electrolyte solution flows in the electrolyte solution groove, the flowing is unobstructed, and the battery polarization is low; the vanadium redox battery arranged in the collector plate has good charging and discharging performances, thereby being popularized and applied to the vanadium redox battery.

The invention relates to a drought-resisting and water-saving winter wheat spring irrigation and fertilization method. The drought-resisting and water-saving winter wheat spring irrigation and fertilization method is implemented in winter wheat regeneration and jointing stages. The method comprises the following steps of (1) applying nitrogenous fertilizer and potash fertilizer in wheat fields; (2) performing water irrigation through a simple micro-spraying device; (3) starting irrigation from the far end of the wheat fields, after water sprayed by micro-spraying hoses rests on the field surface for 3-5 minutes, removing a section of the micro-spraying hoses to irrigate other areas in sequence until reaching the other end of the fields, and ensuring the irrigation amount to be 35-40 m3 per mu (=0.0667 hectares). The drought-resisting and water-saving winter wheat spring irrigation and fertilization method achieves water irrigation through the simple micro-spraying device, and accordingly is low in cost, simple in installation and field operation, assures years of service, avoids risks of ageing and loss and facilitates water amount control and observation; meanwhile, the drought-resisting and water-saving winter wheat spring irrigation and fertilization method is easy to accept by farmers during production, and by matching fertilization with water irrigation, saves water consumption as well as input of nutrient of nitrogen, phosphorus and potassium, ensures the yield of wheat and improves the utilization rate of nitrogenous fertilizer.

The preparation method comprises the following steps: carrying out acid treatment on a selected single-crystal positive electrode material to form an uneven surface, so that primary particles of the hydroxide generated in a subsequent co-precipitation reaction can be better attached to the surface of the single-crystal positive electrode material, and the surface of the single-crystal positive electrode material is more uniform; precursor particles with a core-shell structure are prepared, each particle is composed of an inner core and an outer shell layer, the inner core is a single-crystal positive electrode material, the outer shell layer of each particle is formed by aggregating nickel-containing composite hydroxide primary particles, and the structure can further improve the cycle performance, the overall packing density and the specific capacity of the material; meanwhile, according to different application fields, the primary particles of the shell layers of the particles are in a sheet shape, a block shape, a spindle shape or a needle shape, so that the tap density of the material is further improved, and meanwhile, the rate capability, the cycle performance and other electrochemical performance of the lithium ion battery are improved.

The invention belongs to the technical field of welding, and particularly relates to a technological method for welding low-temperature ductile iron and a manganese steel plate. A NiFe-1 welding rod is selected, an MAG shielded welding technology is adopted, a low-temperature ductile iron material and the manganese steel plate are welded together in an intermittent welding manner, and the low-temperature ductile iron material, the manganese steel plate and the welding rod are not preheated before welding and are not subjected to heat treatment after welding. According to the welding technology, weld joint root fusion is good, weld joint appearance molding is good, and the surface is free of cracks and pores; the low-temperature ductile iron material is free of the phenomena of embrittlement and cracking; the quality of the manganese steel plate is not reduced; and energy consumption is reduced.

The invention relates to a positive electrode material with oxide coated on the outer layer of single crystal and a preparation method of the positive electrode material, the selected single-crystal positive electrode material is subjected to acid treatment to form an uneven surface, so that hydroxide primary particles can be better attached to the surface of the single-crystal positive electrode material in a subsequent coprecipitation reaction; the positive electrode material particles obtained after sintering with a lithium source are composed of an inner core and a shell layer, the inner core is a single-crystal positive electrode material, and the particle shell layer is formed by primary crystal grain aggregation of a nickel-containing composite oxide; the positive electrode material has good cycle performance, relatively high filling density and relatively high specific capacity; according to different application fields, primary crystal grains of the material have microscopic characteristics similar to cuboids, blocks, strips and sheets, the tap density of the material is further improved, and meanwhile, the rate capability, the cycle performance and other electrochemical performance of the lithium ion battery are improved.

The invention relates to a nut. The nut comprises a connecting block, a first nut body, and a second nut body; one end of the connecting block is fixedly connected to the first nut body, the other endof the connecting block is fixedly connected to the second nut body, a gap is arranged between the first nut body and the second nut body, and a limiting screw for preventing the nut from shaking isarranged on the connecting block. The nut has the beneficial effects that through the connecting block, rapid connection of the first nut body and the second nut body is achieved, through the connecting block, shaking of the first nut body and the second nut body in the radial direction can be limited, through the limiting screw on the connecting block, limiting of the whole nut in the axial direction is prevented, mounting quality of the whole nut is ensured, a detachable operation rod on the connecting block can achieve rapid rotation of the nut, according to different mounting environments, different models of operation rods can be selected, the mounting efficiency and the mounting quality of the nut can be improved, and the subsequent maintaining can be facilitated.

The invention relates to a nickel-iron slag self-heat preservation autoclaved brick and a preparation method for the same. The nickel-iron slag self-heat preservation autoclaved brick comprises nickel-iron slag and a calcium material, wherein the calcium material is preferably carbide slag; the nickel-iron slag comprises powdery nickel-iron slag and granular nickel-iron slag. The nickel-iron slag self-heat preservation autoclaved brick has a low heat transfer coefficient, strong compressive strength and high freezing resistance; the strength grade can reach MU30; the appearance quality and dimensional deviation of the nickel-iron slag self-heat preservation autoclaved brick are consistent with standards; the surface of the self-heat preservation autoclaved brick is detected to be free of bubbling, stripping and cracks by virtue of weather resistance tests; in addition, the aims of treating wastes with wastes and turning the wastes into wealth can be fulfilled, pollution caused by the nickel-iron slag can be reduced, and the ecological environment can be optimized; high added value can be obtained with low cost, so that the self-heat preservation autoclaved brick has great economic and social benefits.

The invention discloses a curved surface compensation conveying belt, and relates to the technical field of conveying belts. The curved surface compensation conveying belt comprises a skeleton layer,an upper covering layer and a lower covering layer, wherein the upper covering layer is positioned on the outward side of the skeleton layer, and comprises a middle upper adhesive section and an edgeupper adhesive section in the width direction; the middle upper adhesive section is thicker than the edge upper adhesive section; the lower covering layer is positioned on the inward side of the skeleton layer, and comprises a middle lower adhesive section and an edge lower adhesive section in the width direction; and the middle lower adhesive section is thinner than the edge lower adhesive section. The service life of easily worn parts of the covering layers is prolonged through a curved surface compensation method, so that the service life of the conveying belt is prolonged.

The invention discloses antitrust paint for improving the brightness of finish. The antirust paint is the characterized by being prepared from 8-12 parts by weight of copal resin, 32-36 parts by weight of organosilicon epoxy resin, 3-5 parts by weight of tetraethylenepentamine, 5-7 parts by weight of 2-hydroxypropyl acrylate, 1-2 parts by weight of ammonium polyphosphate, 11-14 parts by weight of modified asphalt, 4-7 parts by weight of modified waste clay sand, 1-2 parts by weight of fluorescent pigment, 1-2 parts by weight of borneol, 0.3-0.7 parts by weight of a silane coupling agent, 1-2 parts by weight of polyolefin wax, 2-3 parts by weight of light calcium carbonate, 1-2 parts by weight of titanium dioxide, 2-3 parts by weight of cellulose acetate, 1-2 parts by weight of micaceous iron oxide, 10-13 parts by weight of a gasoline solvent No. 200 and 4-6 parts by weight of butyl acetate. By use of the natural resin copal, the antirust paint has the characteristics of nontoxicity and stable properties. The borneol in the paint has a fragrance and effects of relaxing and raising spirit and restoring consciousness, can effectively reduce the peculiar smell of the paint and smells comfortable. The used polyolefin wax can be uniformly disperse a filler to avoid paint quality influence caused by the formation of dust agglomeration. The used micaceous iron oxide has a strong anti-rust effect. The used fluorescent pigments and titanium dioxide can improve the brightness of the antirust paint and give people a comfortable visual enjoyment.