33results about How to "Meet the requirements of engineering use" patented technology

A graphene auxiliary brazing method for a ceramic matrix composite material and a metal material elates to a brazing method for the ceramic matrix composite material and the metal material and solves the problem that a brazed connector obtained by brazing the ceramic matrix composite material and the metal material is poor in mechanical property. The brazing method comprises the steps of placing the ceramic matrix composite material into plasma reinforcing chemical vapor deposition equipment to carry out plasma surface treatment, adding CH4 gas to regulate flow, opening a radio frequency power supply, regulating the radio frequency to deposit for 10-30min, using Ar and H2 as protection gas, cooling to the room temperature, obtaining the ceramic matrix composite material with graphene growing on the surface, placing Ti brazing filler metal between faces to be connected, placing the Ti brazing filler metal into a vacuum brazing furnace to be brazed, and finally cooling to the room temperature to finish brazing. The shear strength of a connector formed by the ceramic matrix composite material and the metal material in the brazing method can reach to 35Mpa at the room temperature.

The invention discloses a method for obtaining the mechanical property of a metal material based on a load-depth curve and belongs to the technical field of material property test. On the basis of determining to adopt a large pressed depth ratio (the depth h/the radius R of a pressing head), three kinds of engineering materials, namely alloy steel, aluminum alloy and titanium alloy, of which the elasticity modulus has remarkable difference are treated respectively by adopting two depth combinations (h1=0.1R and h2=0.4R) so as to obtain the respective material property coefficients; a ball factor S which reflects a hardening index effect is introduced so as to obtain a relational expression among a dimensionless function, W/(h3sigmarS ) and E*/(sigmarS); and the mechanical property of a tested material can be finally determined through constitutive relations, obtained by simulation by adopting finite element values, between the coefficients and the materials. By the method, the obtained result is more accurate; and the method is easy and quick and applicable to engineering structural materials in accordance with the power law.

The invention discloses a microbial composite treatment for gold ore tailings and an application method and belongs to the field of road engineering. According to the method, Bacillus pasteurii is compounded with one or more of Bacillus subtilis, Bacillus pumilus or Bacillus megaterium, so that by means of the Bacillus pasteurii, CaCO3 crystal is deposited and generated in the gaps in the gold oretailings, thus improving mechanical performance and stability and immobilizing heavy metal and noble metal ions in the gold ore tailings. The Bacillus pumilus or Bacillus megaterium can decompose thecyanides in the gold ore tailings. Through mechanical ploughing and multi-round slurry injection, the microorganisms, the gold ore tailings and a cemented liquid are fully mixed and contacted with each other, so that purposes of generating the CaCO3 crystal for reinforcing the gold ore tailings and degrading the cyanides can be achieved. The method has no secondary pollution, is low-cost, is simple and is high in resource utilization rate, and can achieve multi-channel large-scale recovery utilization of the tailings.

The invention provides a high-strength and high-toughness gas shielded flux-core wire used for bridge steel. The high-strength and high-toughness gas shielded flux-core wire comprises a skin and a flux core wrapped by the skin. The flux core comprises, by weight, 30%-50% of rutile, 2%-8% of feldspar, 1%-6% of quartz, 0.5%-5% of zircon, 0.5%-5% of sodium fluoride, 0.1%-1.5% of lithium fluoride, 1%-8% of potassium-sodium arc stabilizers, 10%-25% of silicon-manganese alloys, 1%-8% of manganese metal, 1%-6% of magnesium powder, 5%-15% of nickel powder, 0.1%-1.5% of ferrotitanium, 0.05%-0.6% of ferroboron, and the balance iron powder, and the weight percents of the ingredients add up to 100%. According to the high-strength and high-toughness gas shielded flux-core wire used for the bridge steel, all the gradients and properties of the wire can meet the engineering using requirements of high-strength steel plates, and the wire is especially suitable for welding of Q500qE.

The invention discloses a processing method and application method of a bayer process red mud roadbed, and belongs to the field of road engineering. The method comprises the following steps: fully mixing the paved bayer process red mud roadbed with microbiological bacterial liquid containing bacillus pasteurii according to a certain proportion in a way of mechanical plowing; supplying nutrient liquid and consolidating fluid to red mud in a way of several rounds of grouting. According to the processing method and application method of the bayer process red mud roadbed disclosed by the invention, the ways of mechanical plowing and grouting are innovatively adopted, so that three of the bacillus pasteurii, the red mud and the consolidating fluid are fully mixed and contact with each other; red mud particles are filled with calcium carbonate crystal produced by the bacillus pasteurii in pores of the red mud in a cementing manner, so that consolidation on the red mud is realized; the consolidated red mud can be used for roadbed filling engineering, and has the characteristics of no secondary pollution, low cost, simpleness in preparation method and high resource utilization ratio. In addition, the method disclosed by the invention also has the advantages that harmful components such as heavy metal in the red mud also can be consolidated, and multi-channel large-scale resource utilization of the red mud can be realized.

A chromium pollution soil combined remediation method includes the steps that the concentration and the content of chromium and the optimum moisture content in chromium pollution soil are determined;a calcium polysulfide solution is selected, the chromium pollution soil and the calcium polysulfide solution are mixed and stirred according to a molar ratio of 2:1-3:1, and mixed material is added with water to maintain the optimum moisture content until the chromium of the chromium pollution soil is reduced from sexavalence to trivalence; coal ash is selected to compose zeolite, the amount of admixture is 10%-15%, the zeolite and the chromium pollution soil are mixed and stirred, mixed material is added with water to maintain the optimum moisture content until the steady absorption of the chromium of the chromium pollution soil is completed; and cement is selected, the amount of admixture is 5%-10% or 15%-20%, the cement is mixed and stirred with the chromium pollution soil, mixed material is added with water to maintain the optimum moisture content, and curing period is maintained for 7-28 days until the solidification of the chromium pollution soil is completed. The chromium pollution soil combined remediation method has the characteristics of good remediation effect, good long-term stability of the remediation effect, no secondary pollution, lower remediation cost and remediation mode reclamation.

The invention discloses a red mud processing method. Red mud is mixed with a bacterial liquid containing Bacillus pasteurii to obtain a mixture 1. A consolidating solution is preferably added to the mixture 1, and the consolidating solution and the mixture 1 are mixed to obtain a mixture 2; and the mixture 2 is used in a civil engineering material, and the consolidating solution is sprinkled on the surface of the obtained civil engineering material after construction in order to complete the removal of the red mud from the civil engineering material. The Bacillus pasteurii is creatively compounded and contacted with the red mud to surprisingly obviously improve the strength and the rigidity of the red mud; the processed red can surprisingly meet requirements of roadbeds, base layers and sub-base layers of highways and port stockyards when used as a filling material; and heavy metals and other harmful components in the red mud also can be expectedly immobilized through the method. The method can realize the multi-channel and large-scale recycling of the red mud, and realize the purpose of changing red mud into valuables.

The invention relates to a large-thickness workpiece vacuum preheating and electron beam welding device which comprises a vacuum chamber, a heating device, a moving platform, an electronic gun, a clamping tool and a to-be-welded workpiece. The to-be-welded workpiece is composed of two large-thickness workpieces. The heating device comprises an upper heating assembly, a lower heating assembly and three side wall heat insulation protection assemblies. In the vacuum environment, workpiece high-temperature preheating is achieved, the cooling speed is effectively reduced, generation of quenched structures in welding seams and heat affected zones is avoided, and the problems that the welding seam crack tendency of high-strength steel and high-strength titanium alloys and other products is large,and ductility and toughness of welding seams are poor are solved through a high-temperature preheating and electron beam welding method.

The invention provides a liquid mixing and temperature adjusting method of a cooling process of heat transformation. According to the implementation mode of the method, a liquid return branch (7) is additionally arranged on an original circulation loop, so that part of liquid flows back to an inlet of a circulating pump (4) again after passing through a heat exchanger (5), the flow of returned cold liquid is adjusted through the opening degree of a flow regulating valve I (9) and a flow regulating valve II (11), thus different inlet temperatures of the different heat exchanger (5) are obtained, different outlet temperatures and temperature differences of the inlet temperatures and the outlet temperatures are obtained, adjustment of the heat exchange amount of the cold liquid is achieved finally, and requirements for engineering use are met.

The invention discloses an application of a known impervious canal joint material synthesized by fly ash in the construction at a moist interface or in water. The proposer carries out an experiment to the material at the moisture interface or in the water; experiments show that the bonding strength of the construction of the canal joint material synthesized by the fly ash at the moisture interface or in the water achieves more than 80 percent of that at a dry interface, so the impervious canal joint material synthesized by the fly ash can fully solve problems of moist and water-contained bonding which are encountered during the actual engineering, and satisfy the operating requirement of the engineering.

The invention discloses FeCuNiSn series alloy powder for a diamond product and a preparation method thereof, and belongs to the technical field of metal material powder metallurgy. The FeCuNiSn seriesalloy powder is prepared from the following components: Fe-Cu-Ni-Sn pre-alloy powder and Cr3C2 or/and Mo2C superfine additive powder. The preparation method comprises the following steps: preparing Fe-Cu-Ni-Sn four-component pre-alloy powder by adopting a high-temperature liquid smelting and high-pressure water atomization method, or uniformly mixing the Fe-Cu-Ni-Sn four-component pre-alloy powder and ultrafine additive powder to obtain FeCuNiSn series alloy powder. According to the invention, the wear resistance of a powder sintered body can be weakened, the sintering temperature is reduced,the density, the bending strength and the diamond holding force of a sintered matrix are improved, and the sharpness of a tool is improved; cr3C2 or/and Mo2C is/are added, so that the sharpness of the diamond product is obviously improved, and the development requirements of dry cutting/dry grinding and efficient machining of the diamond product are met.

The invention discloses a continuous flow calibration system and method for a high-temperature gas regulator. The system is characterized in that a gas outlet of a gas generator is provided with a main pipeline, and the main pipeline is sequentially provided with a throttling ring and an outlet throat pipe in the gas flowing direction; an inlet of a branch pipeline is connected to the main pipeline between the gas generator and the throttling ring, and an outlet of the branch pipeline is connected to the main pipeline between the throttling ring and the outlet throat pipe; a to-be-calibrated gas regulator is mounted on the branch pipeline; e two pressure sensors are arranged on the inlet side and the outlet side of the throttling ring respectively. A temperature sensor is arranged on the inlet side of the throttling ring. The characteristic that the inlet and outlet pressure ratio of the gas regulator under the real working condition of the engine is equivalent to the inlet and outletpressure ratio of the gas regulator in a ground test system is utilized, the step of calibrating the flow coefficient of the gas generator is simplified, so that the ignition frequency and the numberof matched products required in the calibration process of the gas regulator are effectively reduced, and the cost is low.

The invention discloses superfine clay-based foam light soil and a preparation method thereof. The superfine clay-based foam light soil is prepared from the following components in parts by weight: 230-330 parts of cement, 205-300 parts of hollow glass beads, 35-55 parts of metakaolin, 80-195 parts of superfine clay, 190-220 parts of water and 20-38 parts of a foaming agent. The compressive strength index of the prepared foam light soil meets the engineering requirements, meanwhile, the anti-seepage performance of the foam light soil is improved, and the preparation method is simple; due to the particle morphology, microstructure and charge characteristics of the clay mineral, the clay mineral has very strong adsorption capacity on additives and water and has great influence on the rheological property of the cement-based material, and most of the clay mineral is layered silicate with negative charges and is formed by interlayer electrostatic interaction; the superfine clay is added into the foam light soil slurry, so that the yield stress, the plastic viscosity and the apparent viscosity of the foam light soil slurry can be remarkably improved, the impermeability of the foam light soil slurry is improved, and the engineering use requirements are met.