14results about How to "Low elemental content" patented technology

The invention discloses a recovery method of titanium alloy powder for additive manufacturing, and relates to the technical field of titanium alloy materials, the recovery method comprises the following steps: step 1, sheath material selection and processing: carbon steel with good welding performance is preferably selected as a sheath material; the size of the sheath is designed according to the actual ingot shape condition; 2, selecting raw materials, namely mixing titanium alloy spherical powder and micron-sized titanium alloy powder with the granularity of 15-300 mu m and the same brand, and performing an HIP + VAR process to obtain a titanium alloy cast ingot with more uniform material components and smaller element content range; a conventional titanium alloy powder hot isostatic pressing process needs a high treatment temperature which is generally between 930 DEG C and 1050 DEG C, the density of a blank after hot pressing is required to be close to 100%, according to the method, the material hot isostatic pressing treatment temperature is required to be 600 DEG C to 650 DEG C, an electrode blank with certain strength meeting VAR smelting can be obtained, energy consumption is reduced, and meanwhile the requirement for the performance of hot isostatic pressing equipment is extremely low.

The invention provides a solid electrolyte material element content detection method, which comprises: a) carrying out heating treatment on a to-be-detected LiAlPO4F electrolyte material in the presence of a shielding gas to obtain a contact material; introducing the protective gas tail gas into alkali liquor to obtain a first contact material solution; b) digesting the contact material obtained in the step a) in the presence of acid to obtain a second contact material solution; and c) testing the contents of lithium, aluminum and phosphorus elements in the second contact material solution by inductively coupled plasma atomic emission spectrometry, and testing the contents of fluorine elements in the first contact material solution and the second contact material solution by ion chromatography, thereby completing the detection of the element contents of the LiAlPO4F electrolyte material. Compared with the prior art, the detection method provided by the invention has the advantages that specific steps are adopted, overall better interaction is realized, the content of each element in the LiAlPO4F electrolyte material can be accurately and effectively quantitatively determined, the operation is simple, and the detection method is more scientific.

The invention discloses a preparation method of an ultra-pure nickel-titanium alloy thin-wall pipe for a heart valve. The method comprises the following steps: 1, preparing materials, and carrying out magnetic suspension induction melting to obtain a cast ingot; 2, gradually performing hot forging and rolling on the cast ingot to obtain a round bar; thirdly, the round bar is manufactured into a pipe blank, honing and polishing are conducted, and the nickel-titanium pipe is obtained; 4, assembling the nickel-titanium pipe into the titanium pipe to obtain a combined pipe; 5, heat treatment of the combined pipe; 6, three-roller precise cold rolling; 7, repeating to obtain a pipe semi-finished product; and 8, straightening and cylindrical grinding are performed to remove the titanium pipe. According to the method, the high-purity nickel-titanium alloy cast ingot is prepared through magnetic suspension induction melting, the outer-layer titanium pipe and the inner-layer nickel-titanium pipe are introduced to be assembled, the pass deformation is increased through the restraining and protecting effects of the titanium pipes, the number of times of rolling and heat treatment is reduced, and the machining period is shortened; the obtained ultra-pure nickel-titanium alloy thin-wall pipe is high in purity, high in size precision, good in surface quality, high in wall thickness uniformity and good in comprehensive mechanical property and is suitable for the field of heart valves.

The invention belongs to the technical field of fluorite concentrate, and specifically is a method for improving the quality of fluorite concentrate, comprising the following steps: SO1: fluorite concentrate is diluted with water to a concentration of 30%, placed in a flotation tank, and then 1000g / t to 2000g / t NaOH, 200 to 300g / t CaCl2, 4000 to 6000g / t water glass, and 100 to 200g / t oleic acid are added in sequence during roughing operation; the invention provides a method for improving the grade of fluorite concentrate and reducing the content of impurity elements thereof, thereby improving the quality of fluorite concentrate and improving the economic benefits of the product.

The present invention belongs to the technical field of stainless steel production and manufacturing, and specifically relates to a Mo-containing austenitic stainless steel welding strip and its preparation method and application. The Mo-containing austenitic stainless steel welding strip of the present invention comprises, by weight percentage: C≤0.020%, 0.2%≤Si≤0.6%, Mn≤2.00%, P≤0.020%, S≤0.010%, 21.00%≤Cr≤22.00%, 13.00%≤Ni≤14.00%, 2.50%≤Mo≤3.00%, 0.03%≤N≤0.08%, Cu≤0.2% and the balance of Fe and inevitable impurities. The Mo-containing austenitic stainless steel welding strip of the present invention adopts one pass of surfacing to replace the original two passes of surfacing in the surfacing process, and the surfacing efficiency is increased by more than 1 times, which is favored by users and has obvious market promotion value.

The invention discloses a method for inhibiting formation of floating anode slime by regulating and controlling components of a copper anode plate in copper electrolytic refining, which comprises the following steps of: adding trace elements such as silver, selenium and tellurium into the copper anode plate to optimize electrochemical behaviors and impurity precipitated phases of an anode boundary in the copper electrolytic refining process; according to the invention, impurity elements such as arsenic, antimony, bismuth and the like in the electrolyte are promoted to form large-particle anode mud for sedimentation, the adsorption of floating anode mud on the surface of cathode copper is avoided, the production pressure of a copper electrolyte purification process is reduced, and the added elements can form circulation in a copper smelting system and cannot influence a copper smelting main system. According to the method, the capacity release of the copper electrolytic refining liquid purification process is realized at a relatively low cost, and the quality of cathode copper is improved.

This utility model provides an electrolytic generator and hot water equipment for supplementing minerals. The electrolytic generator includes a shell, a mineral filter element, and an electrode module. The shell is connected to an inlet pipe and an outlet pipe. The electrode module is connected to the shell. The mineral filter element is disposed in the shell and includes a cover plate and a filter element body. The cover plate and the filter element body are detachably connected. The filter element body contains minerals and is connected to the shell. The detachable connection between the cover plate and the filter element body allows for adjustment of the type and quantity of minerals and facilitates replacement of minerals. While supplementing the mineral element content of the water, it also increases the ion concentration of the water. Electrolysis of the incoming water increases the hydrogen and oxygen content of the water.

The present invention discloses a method for preparing an integrally formed inductor, and relates to the field of magnetic electronic materials, characterized in that: Step 1: material selection, according to the requirements of the use frequency (0.1-20MHz), inductance value, power loss, RDC and Isat of the inductor device, ultrafine carbonyl iron powder, iron silicon, iron silicon chromium, iron nickel, iron cobalt and other soft magnetic powders are selected as the basic powders of the integrally formed inductor; Step 2: screening, the soft magnetic powders with a certain particle size distribution are screened out by screening mechanism and powder grading technology. The present invention innovatively proposes a metal soft magnetic alloy-soft ferrite in-situ composite technology, which not only ensures the surface insulation effect of the alloy magnetic powder, but also effectively avoids the reduction of magnetic properties, and improves the comprehensive performance of the integrally formed inductor; the present invention adopts Co trace elements to replace Fe, and improves the saturation magnetic induction intensity of the alloy; and adopts Ni, Mo and Nb to partially replace Cr, reduce the Cr element content, and improve corrosion resistance.

This application relates to a low-alpha-ray silica and its preparation method. The method involves adding a high-purity sodium sulfate solution to water glass, followed by the sequential addition of dilute sulfuric acid solutions of varying concentrations for aging. The resulting precipitate is then calcined to obtain low-alpha-ray silica with Th ≤ 5 ppb and U ≤ 5 ppb. The sodium sulfate solution optimizes the precipitation process in two ways: first, it increases the ionic strength of the solution, compresses the colloidal double layer, and disrupts the metastable state of the system, thus promoting the aggregation and crystallization of the target precipitate; second, sulfate ions preferentially complex or inhibit the precipitation tendency of impurity cations based on the common ion effect; furthermore, the dilute sulfuric acid solution promotes the reaction and rapid precipitation of silicate ions with hydrogen ions, causing the Th and U ions encapsulated in the precipitate to precipitate out, thereby reducing the impurity content in the solution. This low-alpha-ray silica, due to its extremely low Th and U content and good thermal conductivity, can be widely used in high-performance and special-purpose chip packaging fields.

The application relates to the technical field of battery material preparation, and discloses a preparation method of iron phosphate, which comprises the following steps: obtaining iron ore acid leaching solution, the pH value of the iron ore acid leaching solution is 1.5-3.5; taking at least part of the iron ore acid leaching solution as the bottom liquid of a reaction kettle, adding a phosphorus-containing mixed solution into the reaction kettle for a synthesis reaction, the dropping time is controlled to Tmin, T <= 420n, n is the unit volume molar number of iron ions in the iron ore acid leaching solution, after the dropping is completed and sufficient reaction is carried out, solid-liquid separation is carried out to obtain first solid material containing iron phosphate; extracting anhydrous iron phosphate from the first solid material; the phosphorus-containing mixed solution contains phosphoric acid and a first oxidant. The method realizes the regulation of the crystal morphology and the microstructure of the iron phosphate, can obtain iron phosphate with various morphologies, provides a feasible direction for preparing iron phosphate with different morphologies, and meets the application requirements in different fields; the preparation process does not introduce alkali liquor, the cost is reduced, and the prepared finished product has low impurity content.

The application discloses a kind of foamed metal foil for grain boundary diffusion, neodymium iron boron diffusion magnet and preparation method.The preparation method of the foamed metal foil for grain boundary diffusion of the application comprises the following steps:1) depositing a rare earth alloy film on the surface of a foamed metal foil sheet to obtain a coated foamed metal foil sheet;2) fold the coated foamed metal foil sheet obtained in step 1) in half, with the coated side facing in, and compress after folding to obtain a foamed metal foil for grain boundary diffusion.The foamed metal foil for grain boundary diffusion of the application enhances the adhesion of the rare earth alloy film, and when used for grain boundary diffusion, it increases the coercivity of the neodymium iron boron magnet while reducing the drop in remanence.

This invention relates to the field of welding technology, specifically to a pretreatment method for weldable parts, a composite manufacturing method, and a hot-stamped component. The pretreatment method for the weldable parts includes: before welding the edge of a coated steel plate to be welded, performing a heat treatment to melt the coating on the edge, and immediately extruding away the coating elements from the surface of the edge to be welded, forming a weldable area. This invention uses heat treatment to melt the coating and extrusion to remove the coating elements from the edge to be welded. This invention has high coating removal efficiency, eliminates the need for a pretreatment production line, and eliminates the need for prefabricated specific gaps between weldable edges and special high-alloy welding wire, thereby significantly reducing the cost of tooling fixtures and welding wire and improving welding loading efficiency. Furthermore, it ensures that the weld joint performance is qualified and the quality is stable after heat treatment in mass production.

The invention relates to a Cu-Cr-Ni corrosion-resistant steel bar and a preparation method thereof, belongs to the technical field of corrosion-resistant steel, and solves the technical problem of poor marine atmosphere corrosion resistance of steel. According to the technical scheme, the Cu-Cr-Ni corrosion-resistant steel bar comprises the following chemical components in percentage by weight: 0.10 to 0.11 percent of C, 0.3 to 0.5 percent of Si, 1.1 to 1.5 percent of Mn, 0.3 to 0.6 percent of Cu, 0.7 to 0.9 percent of Cr, 0.2 to 0.4 percent of Ni, 0.01 to 0.03 percent of V and the balance of Fe and inevitable impurities. The preparation method has the characteristics of simple process and low preparation cost; the method has the advantages of sustainability and economical efficiency, and can effectively save the cost so as to bring greater economic benefits; the prepared Cu-Cr-Ni corrosion-resistant steel bar is excellent in mechanical property, marine atmosphere corrosion resistance and seawater corrosion resistance.

The invention relates to an ultra-low magnetic susceptibility and residual magnetic moment detection quality and a preparation method and application thereof, and relates to the technical field of precious metal processing. The preparation method comprises the following steps: smelting: weighing raw materials, smelting by adopting a vacuum electron beam smelting method, melting the raw materials, preserving heat, pouring, forming a cast ingot, cooling, solidifying and casting; and the cast ingot is annealed and cut to obtain a plurality of ingot blocks, and the ingot blocks are subjected to multidirectional forging and surface treatment to obtain the detection quality. According to the preparation method, the production efficiency is improved, meanwhile, the content of ferromagnetic impurity elements in the inspection mass is greatly reduced, higher purity is achieved, the magnetic susceptibility and the residual magnetic moment of the Au-Pt alloy inspection mass are remarkably reduced, and the technical index requirement of gravitational wave detection is met.