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75results about How to "Play a role in diffusion strengthening" patented technology

Microcrystalline glass ceramic binding agent, preparing method thereof, SG grinding wheel and preparing method thereof

The invention discloses a microcrystalline glass ceramic binding agent, a preparing method thereof, an SG grinding wheel and a preparing method thereof. The binding agent is prepared from, by weight percentage, 40% to 65% of SiO2, 6% to 20% of Al2O3, 5% to 18% of Na2O, 0.5% to 5% of CaO, 3% to 10% of K2O, 8% to 35% of B2O3, 0.5% to 2% of MgO and 2% to 6% of TiO2. The microcrystalline glass ceramic binding agent is formed by reasonably selecting the raw materials, the scientific ratio is adopted, the binding agent has the beneficial effects of being low in thermal expansion coefficient and crystallization temperature and high in strength accordingly, the microcrystalline glass ceramic binding agent is suitable for being used as a binding agent of the SG grinding wheel, the firing temperature of the SG grinding wheel is greatly reduced, and the firing time of the SG grinding wheel is greatly shortened; and meanwhile the work efficiency and the machining accuracy of the SG grinding wheel are improved, grinding heat is reduced, and the service life of the grinding wheel is prolonged.
Owner:白鸽磨料磨具有限公司

Metallic bond, diamond grinding wheel prepared through bond and preparation method of diamond grinding wheel

The invention relates to a metallic bond, a diamond grinding wheel prepared through the bond and a preparation method of the diamond grinding wheel. The metallic bond comprises, by weight percent, 95%-99% of copper-tin prealloyed powder, 0.5%-3% of graphite powder and 0.5%-2% of nanometer alpha-Al2O3. The copper-tin prealloyed powder, the graphite powder, the nanometer alpha-Al2O3 and diamond are taken according to a certain proportion, procedures of burdening and material mixing, pelletizing, compression, sintering and aftertreatment are carried out in sequence, and tool bits can be prepared. The multiple tool bits are arranged on a matrix at equal distance in the circumferential direction, the cambered surfaces of the tool bits are perpendicular to the matrix, and the diamond grinding wheel is prepared. The above tool bits are uniform in ingredient and good in density, diamond distribution is uniform, and the control effect of the metallic bond on the diamond is good. The grinding wheel has the beneficial effects of being good in ground workpiece surface quality, free of dark cracks and scratches, sharp in grinding and long in service life, facilitating large-scale production and the like and is especially suitable for producing sapphire wafers with the thinning thickness ranging from 100 micrometers to 700 micrometers.
Owner:BEIJING GANG YAN DIAMOND PROD CO +1

High-strength steel plate for ocean engineering and production method thereof

The invention discloses a high-strength steel plate for ocean engineering and a production method thereof. The production method comprises the working procedures of smelting, continuous casting, heating, rolling, heat stacking and heat treatment, wherein the molten steel obtained in the smelting procedure comprises the following chemical ingredients with contents in percentage by mass: 0.05-0.09% of C, 0.10-0.30% of Si, 1.1-1.35% of Mn, not greater than 0.010% of P, not greater than 0.003% of S, 0.15-0.4% of Ni, 0.15-0.35% of Cr, 0.10-0.30% of Mo, 0.020-0.050% of Nb, 0.03-0.05% of V, 0.020-0.050% of TAl, and balance Fe and inevitable impurities; a quenching and tempering process is adopted in the heat treatment procedure; during the quenching process, a heating temperature is 880-910 DEG C, and a total heating time is PLC +(20-40) minutes; and during the tempering process, a heating temperature is 580-620 DEG C, a total heating time is 1.5-2 minutes per millimetre, and air cooling is carried out after discharge. According to the method disclosed by the invention, through adjustment and optimization for the proportion of alloy elements in the steel plate, and quenching and low-temperature short-time tempering, good mechanical properties of the steel plate can be guaranteed under a low-carbon-equivalent condition, and the steel plate is enabled to have good structure, comprehensive property and welding property.
Owner:WUYANG IRON & STEEL

Rare-earth-oxide-doped W-Cu composite material and preparation method thereof

The invention provides a W-Cu composite material which is characterized by comprising the following components in percentage by mass: 5-30 wt% of Cu, 0.5-2 wt% of rare-earth oxide and the balance of W. The invention also provides a preparation method of the W-Cu composite material. The density of the composite material is up to 99.2%, the density uniformized coefficient of different positions is less than 5%, the room temperature tensile strength is greater than 900 MPa, the elongation percentage is greater than 10%, and the fracture toughness K1C is greater than 28 MPa.m<1 / 2>; and thus, the composite material satisfies the performance requirements of electric contact materials and liner materials for complete density, structure uniformity, ablation resistance and the like of the W-Cu alloy.
Owner:NO 59 RES INST OF CHINA ORDNANCE IND

High-strength and heat-resistant aluminum alloy wire and preparation method thereof

ActiveCN104894437AThe technical difficulty of adding tungsten evenly plays a rolePlay a role in diffusion strengtheningMetal/alloy conductorsHeat resistanceRoom temperature
The invention discloses a high-strength and heat-resistant aluminum alloy wire and a preparation method thereof. The aluminum alloy wire comprises the composition by the mass percentage: 0.6-1.2% of Mg, 0.4-0.8% of Si, 3.0-7.0% of W, and the balance Al. The preparation method of the aluminum alloy wire comprises the following steps: preparing an aluminum alloy liquid, atomizing the aluminum alloy liquid into a powder, screening the aluminum alloy powder, mixing a tungsten powder with the particle size of not more than 3 microns with the aluminum alloy powder, carrying out cold isostatic pressing on the mixed powder into a prefabricated blank, carrying out vacuum degassing, heating, hot-extruding into an aluminum alloy round rod, drawing into an aluminum alloy wire, and carrying out solid solution and aging treatment to obtain the high-strength and heat-resistant aluminum alloy wire. Tungsten is uniformly added into the aluminum alloy wire by adopting a powder hot extrusion method, the strength of the aluminum alloy wire is strengthened, the aluminum alloy wire has excellent room-temperature tensile mechanical properties, electrical conductivity and heat resistance, the room-temperature tensile strength is more than 320 MPa, the elongation rate is more than 9%, the electrical conductivity is more than 56%IACS, and after heat preservation for 1 h at the temperature of 250 DEG C, the tensile strength is more than 290 MPa and the tensile strength survival rate is more than 91%.
Owner:GUANGDONG SHINE CABLES

Nitrogen containing martensitic stainless steel for cutting tool and manufacturing method of nitrogen containing martensitic stainless steel

The invention relates to nitrogen containing martensitic stainless steel for a cutting tool and a manufacturing method of the nitrogen containing martensitic stainless steel. According to the technical scheme, chemical components of the nitrogen containing martensitic stainless steel for the cutting tool comprise 0.45wt%-0.70wt% of C, 13.0 wt%-17.0wt% of Cr, 0.10wt%-0.25wt% of N, 0.50wt%-0.80wt% of Si, 0.40wt%-1.0wt% of Mn, 0.0015wt%-0.0065wt% of Ca, not larger than 0.20wt% of V, not larger than 0.025wt% of Nb, not larger than 0.025wt% of Als, not larger than 0.03wt% of Mo, not larger than 0.008wt% of P, not larger than 0.005wt% of S and the balance Fe and inevitable elements. Meanwhile, the above chemical components meet the condition that C+N is 0.60-0.85wt%. The manufacturing method ofthe nitrogen containing martensitic stainless steel for the cutting tool comprises the steps of vacuum induction smelting, normal-pressure nitrogen increasing, casting, casting blank heating, rolling,quenching and tempering. The nitrogen containing martensitic stainless steel has the advantages that the alloy components are simple, the process is simple and convenient, the production cost is low,and large-scale production is easy. The manufactured nitrogen containing martensitic stainless steel for the cutting tool is high in hardness and good in toughness.
Owner:WUHAN UNIV OF SCI & TECH

Manufacturing method of large-scale high-purity molybdenum alloy rotating target material

The invention discloses a manufacturing method of a large-scale high-purity molybdenum alloy rotating target material. The manufacturing method comprises the following steps of: preparing molybdenum trioxide powder; pouring a tube blank by utilizing the molybdenum trioxide powder and hafnium, and carrying out isostatic cool pressing on the tube blank; and carrying out sintering, extrusion and machining. According to the manufacturing method, a trace of hafnium powder is added in molybdenum trioxide to play a role of refining the particles, so that small-particle size molybdenum powder can be obtained and the density and breaking tenacity of the sintered blank can be improved; and the density of the prepared rotating target material is greater than 10.18g / cm3 and the purity is greater than 99.9%.
Owner:LUOYANG KEWEI MOLYBDENUM & TUNGSTEN
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