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

The invention relates to a vacuum preheating electron beam welding device for large-thickness workpieces, comprising a vacuum chamber, a heating device, a mobile platform, an electron gun, a clamping tool and a workpiece to be welded. Two upper and lower heating components and three side wall heat insulation protection components are used to achieve high temperature preheating of workpieces in a vacuum environment, effectively reducing the cooling rate, avoiding the generation of hardened structures in welds and heat affected zones, using high temperature preheating and electron beams The welding method solves the problems of high-strength steel, high-strength titanium alloy and other products with a large tendency to crack in the weld and poor plastic toughness of the weld.

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 application of a known coal ash synthetic channel jointing anti-seepage material on a damping interface or in water construction. The applicant carries out an experiment on the material on the damping interface or in water; and the experiment proves that the bonding strength of the coal ash synthetic channel jointing material on the damping interface or in water construction reaches more than 80 percent of that on a dry interface, which can fully solve the problems of dampness, water entrainment and adhesion encountered in practical engineering and meet the requirementof the engineering use.

The invention discloses a method for preparing an in-situ vertically grown graphene anti-corrosion layer on the surface of a zirconium alloy, and the invention relates to a method for preparing an anti-corrosion layer on the surface of a zirconium alloy. The invention aims to solve the problems of poor water side corrosion resistance and short service life of the fuel cladding in the existing zirconium alloy cladding. Methods: 1. Pretreatment of zirconium alloy surface; 2. In situ growth of vertical graphene on the surface of zirconium alloy by PECVD method. The invention is used for the preparation of the in-situ vertically grown graphene anticorrosion layer on the surface of the zirconium alloy.

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 material-distribution type cooling process of white cement clinker. High-temperature clinker discharged from a rotary kiln is dropped into a grate type cooler, and a retractable material distributor is arranged on the front end part of the grate cooler in an interpenetrating manner; 20%-60% of granular clinker in the high-temperature clinker fallen from the rotary kiln is introduced by the material distributor to a discharging hole in the side part of the grate cooler to enter a rotary type bleaching machine to be cooled to 100 DEG C-300 DEG C by water spraying; the rest of the clinker particles are subjected to forced air cooling to 80 DEG C-100 DEG C by the grate cooler; high-temperature air preheated by the clinker and one part of medium-temperature air in the grate cooler are respectively provided for fuel combustion of the rotary kiln and a decomposing furnace as secondary air and tertiary air; the other part of the medium-temperature air enters a vertical type coal mill after entering a cyclone dust collector for collecting dust to provide drying hot air; low-temperature air and a vapor-containing gas exhausted by the bleaching machine are exhausted into atmosphere after entering a kiln-head electric dust collector for removing the dust. According to the invention, a material-distributing and cooling method of the white cement clinker can solve a defect that the conventional white cement clinker calcining is free from secondary air and tertiary air; meanwhile, whiteness requirements of the white cement can be ensured, and effects of increasing yield and saving energy can be obtained.

The microalloy iron-based composite powder for diamond products and the preparation method thereof of the present invention belong to the technical field of metal material powder metallurgy. The components of the microalloyed iron-based composite powder include Fe-based pre-alloyed powder and ultra-fine additive powder; Fe-based pre-alloyed powder is doped with Si, Mn, La+Ce mixed rare earth; the ultra-fine additive powder is Cr 3 C 2 or / and Mo 2 C; superfine additive powder by weight: Fe-based pre-alloyed powder = 0.3-5: 95-99.7. The Fe-based pre-alloyed powder is prepared by high-temperature liquid melting and high-pressure water atomization, and then evenly mixed with ultra-fine additive powder. The method of the present invention can effectively prevent the coarsening and growth of powder particles by sintering, improve the comprehensive mechanical properties of the powder sintered body, and improve the sharpness of diamond tools; Requirements.

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 FeCuNiSn series alloy powder used for diamond products and the preparation method thereof of the present invention belong to the technical field of metal material powder metallurgy. Described FeCuNiSn series alloy powder, component has Fe-Cu-Ni-Sn pre-alloyed powder and Cr 3 C 2 or / and Mo 2 C superfine additive powder. The preparation method adopts high-temperature liquid melting and high-pressure water atomization methods to prepare Fe-Cu-Ni-Sn four-component pre-alloyed powder, or mix it with ultrafine additive powder to obtain FeCuNiSn alloy powder. The invention can weaken the wear resistance of the powder sintered body, reduce the sintering temperature, increase the density, bending strength and holding force of the diamond of the sintered matrix, and improve the sharpness of the tool; Cr 3 C 2 or / and Mo 2 The addition of C can significantly improve the sharpness of diamond products, and meet the development needs of dry cutting / dry grinding and efficient processing of diamond products.