17 results about "Elemental impurities" patented technology

The invention relates to a method for detecting element impurities of a total flavone extract of immature bitter orange or bitter orange. The method adopts ICP-MS (Inductively Coupled Plasma Mass Spectrometry) to simultaneously determine seven elements, namely arsenic (As), cadmium (Cd), mercury (Hg), lead (Hg), cobalt (Co), nickel (Ni) and vanadium (V). The method for determining the element impurities of the total flavone extract of the immature bitter orange or the fructus aurantii is established, the theoretical basis of the method is sufficient, and the method is proved to be strong in specificity, high in sensitivity and strong in accuracy after verification.

The invention discloses an adsorption and impurity removal system for boron and phosphorus impurities in trichlorosilane, and relates to the technical field of polycrystalline silicon production.The adsorption and impurity removal system for boron and phosphorus impurities in trichlorosilane comprises a reactor, a feeding pipeline and a quantitative structure.The feeding pipeline is arranged on the reactor and used for conveying an adsorbent into the reactor, and the quantitative structure is arranged on the feeding pipeline; the quantitative structure comprises a centralizing box, a detection device, a supporting plate, a pushing plate and a first driver, the centralizing box is arranged on the throwing pipeline, a discharging opening is formed in the centralizing box and communicates with the throwing pipeline, the detection device is arranged at the bottom of an inner cavity of the centralizing box, and the supporting plate is movably arranged in the centralizing box and located at the top of the detection device; the detection device is used for detecting the weight of materials on the supporting plate, the pushing plate is movably arranged in the concentration box, and the first driver is installed on the concentration box, is in driving connection with the pushing plate and is used for driving the pushing plate to push the materials on the supporting plate to move towards the discharging port.

The invention relates to a method for determining element impurities in Zinjiang Rigan-8 tablets, which belongs to the technical field of analysis and detection and is characterized in that the element impurities in the Zinjiang Rigan-8 tablets are detected by adopting inductively coupled plasma mass spectrometry. When the inductively coupled plasma mass spectrometry method is used for detecting, a preparation method of a test solution comprises the following steps: weighing 0.1-0.5 g of a Tiangan-8 test sample, precisely weighing, putting into a digestion tank, adding 6.0 ml of nitric acid, standing, stopping the reaction, adding 2.0 ml of hydrogen peroxide, sealing, digesting according to a procedure, cooling to 60 DEG C or below after complete digestion, taking out the digestion tank, cooling to room temperature, and filtering to obtain the test solution. Placing the digestion tank in a 50ml measuring flask, washing the digestion tank with 2% nitric acid, mixing the washing liquor in the measuring flask, dissolving the digestion solution in the digestion tank with purified water, transferring into the measuring flask, fixing the volume to the scale, and shaking uniformly to obtain a test solution. The determination method disclosed by the invention is good in accuracy and good in repeatability.

The application provides a kind of determination method of small broken material surface metal impurity of polysilicon, and the method comprises the following steps: taking small broken material sample of polysilicon in a beaker, adding leaching solution, and digesting; taking the digested sample, cooling to room temperature, and transferring into a volumetric flask, then adding HNO3 for constant volume; shaking the volumetric flask, mixing the solid phase and liquid phase uniformly, and then centrifuging; after centrifugation, taking the supernatant to make a standard curve by standard addition method, the first addition amount of the standard curve should be close to the element content in the sample, and a blank is also prepared; the ICP-MS instrument is tuned to be optimal, the standard addition concentration is taken as the abscissa, the measured ion count CPS value is taken as the ordinate, the standard curve is drawn, and the sample is measured. The application avoids secondary pollution, and does not change the volume of acid leaching solution, and also does not have the problem of incomplete flushing of element impurities.

The invention relates to the technical field of aluminum alloy materials, in particular to a high-impact-resistance aluminum alloy and a preparation method thereof.The high-impact-resistance aluminum alloy comprises, by mass, 0.03%-0.15% of silicon, 0.03%-0.15% of aluminum, 0.05%-0.15% of silicon, 0.05%-0.15% of silicon, 0.05%-0.15% of silicon, 0.05%-0.15% of silicon, 0.05 4.2%-4.4% of copper; 0.01 to 0.05 percent of chromium; 0.8 to 1.0 percent of magnesium; 0.05 to 0.08% of zinc; 0.7%-0.9% of manganese; 0.15%-0.25% of niobium; 0.01 to 0.05 percent of strontium; 0.08% to 0.12% of zirconium; 0.01 to 0.05 percent of titanium; 0.2 to 0.25 percent of rare earth elements; less than 0.12% of impurity iron; other impurity elements are less than 0.1%; and the balance of aluminum. The rare earth elements comprise cerium, scandium, yttrium and erbium. The prepared aluminum alloy has high strength and high impact resistance at the same time.

A brazing sheet, an article formed from or including all or a portion of the brazing sheet, and a method for forming an article of manufacture are provided. The brazing sheet includes a brazing layer and a core layer. The brazing layer includes a 4XXX series aluminum alloy. The core layer includes a first aluminum alloy, the first aluminum alloy including, in weight percent based on the total weight of the first aluminum alloy, 0.2 to 0.6 silicon, 1.5 to 2 manganese, 0.01 to 0.2 titanium, 0.5 to 2.5 copper, 0 to 0.5 iron, 0 to 0.5 magnesium, 0 to 0.5 zinc, 0 to 0.3 chromium, 0 to 0.25 zirconium, and optionally incidental elements, impurities, and aluminum. The first aluminum alloy satisfies formula (I): 3.1 ≦([Mg]+[Fe]+[Cr]) / [Si], where [Mg], [Fe], [Cr], and [Si] are the weight percent concentrations of manganese, iron, chromium, and silicon in the first aluminum alloy, respectively.

The invention discloses a preparation method and application of tert-butyl-2-phenyl-1H-benzimidazole-1-carboxylic ester, 2-phenylbenzimidazole and di-tert-butyl dicarbonate ester are used as raw materials, and the tert-butyl-2-phenyl-1H-benzimidazole-1-carboxylic ester is generated through a reaction under the action of a catalyst DBU; according to the invention, the reaction is a reflux reaction, the reaction time is 2-4 hours, and the molar ratio of the 2-phenylbenzimidazole to the di-tert-butyl dicarbonate ester is 1: (1.2-1.5); the prepared tert-butyl-2-phenyl-1H-benzimidazole-1-carboxylic ester is high in purity, the content of metal element impurities in the tert-butyl-2-phenyl-1H-benzimidazole-1-carboxylic ester is lower than or equal to 100 ppb, and the tert-butyl-2-phenyl-1H-benzimidazole-1-carboxylic ester can be used as a corrosion inhibitor in components of a photoresist cleaning agent and is better in corrosion inhibition effect.

The invention provides a silicon-coated silicon nitride coating material as well as a preparation method and application thereof, and relates to the technical field of thermal spraying surface engineering. Silicon nitride is a high-quality ceramic material with high temperature resistance and good toughness, but the silicon nitride cannot be sprayed at normal temperature and normal pressure to form a coating, so that the silicon-coated silicon nitride coating material provided by the invention is of a core-shell structure and comprises 3.0-20.0 wt.% of a silicon shell and the balance of a silicon nitride core; the particle size of the silicon-coated silicon nitride coating material is 30-50 [mu] m, the sphericity degree is 99%-100%, and the thickness of the silicon coating layer is 3-10 [mu] m. The silicon-coated silicon nitride core-shell structure coating material is constructed, the bonding strength of the coating is remarkably improved, a silicon shell serves as a bonding phase, the problems of bonding and thermal expansion mismatch between the coating and a matrix, insufficient high-temperature stability and the like are effectively solved, and the service life of the silicon-coated silicon nitride core-shell structure coating material is prolonged. Meanwhile, the wettability and the bonding strength of the composite particles and a matrix are improved due to the good ductility of silicon. And other non-silicon and non-nitrogen element impurity components are not introduced into the system, so that the high-purity silicon nitride coating is obtained.

The invention discloses a rare earth guide and guard material containing intermittent network carbide. The rare earth guide and guard material comprises the following components in percentage by mass: basic elements: 0.80-2.30% of C and 0.65-1.35% of Cr; the key control is Cr / C mass ratio gt; 3.5); the content of RE is 0.0020 to 0.010 percent; auxiliary elements: 0.10 to 0.65 percent of Si, 0.85 to 2.50 percent of Mn, 0.06 to 0.77 percent of Mo and less than or equal to 0.03 percent of V; impurities are limited as follows: P is not more than 0.020%, S is not more than 0.025%, and [O] is not more than 15 ppm; and the balance of Fe and inevitable impurities. The invention further discloses a vacuum deep deoxidation preparation process. The invention aims to provide a rare earth guide and guard material containing intermittent network carbide and a vacuum deep deoxidation preparation process thereof, and designs a novel high-temperature-resistant and wear-resistant guide and guard material.

The invention discloses a general detection method for 21 element impurities in an injection, and belongs to the technical field of medical analysis, 21 elements to be detected are divided into two groups for detection by adopting an inductively coupled plasma mass spectrometry and inductively coupled plasma atomic emission spectrometry combined technology: the first group of elements comprise lithium, aluminum, vanadium, cobalt, nickel, copper, arsenic, cadmium, antimony, mercury and lead, and the second group of elements comprise lithium, aluminum, vanadium, cobalt, nickel, copper, arsenic, cadmium, antimony, mercury and lead; detecting by adopting inductively coupled plasma mass spectrometry; the second group of elements comprise boron, silicon, calcium, titanium, chromium, iron, zinc, molybdenum, tin and barium, and are detected by adopting an inductively coupled plasma atomic emission spectrometry. According to the method, a grouping principle based on instrument characteristics and element properties is provided, optimal configuration of detection resources is achieved, and the limitation of a single technology is effectively avoided.

A sample preparation tool (10) for X-ray fluorescence analysis is a tool for preparing a sample for X-ray fluorescence analysis by pulverizing a solid pharmaceutical product (91) to be analyzed into a powder, and is provided with: a pulverizing container (11) for accommodating the solid pharmaceutical product (91); and a pulverizing member (12) that can be housed in the pulverizing container (11) together with the solid pharmaceutical product (91), the inner surfaces (131, 132) of the pulverizing container (11) and the surface (133) of the pulverizing member (12) being made of a material that has lipophobicity, is harder than the solid pharmaceutical product (91), does not contain Cd, Pb, As, Hg, Co, V, or Ni, and has a thickness of 10-30 [mu] m. Or the pharmaceutical composition does not contain impurity elements specified by the element impurity management guidance principle in pharmaceutical preparations published by the technical requirements of human medicines on international coordination affairs.

The application discloses a method for detecting element impurities in polyethylene packaging materials. The method comprises the following steps: cutting the polyethylene packaging materials, precisely weighing, adding hydrochloric acid solution for reflux extraction, extracting element impurities in the polyethylene packaging materials, and obtaining a test sample solution; and using an inductively coupled plasma mass spectrometer (ICPMS) for detection, controlling the helium flow rate, and determining the test sample solution. According to the requirements of ICH Q3D on element impurities in preparations, the application traces back to the packaging materials in the previous step, studies the element impurities in the packaging materials first, determines the applicability of the packaging materials, and then determines whether the packaging materials can be used for corresponding preparation products, so that the loss of large-scale production of enterprises can be avoided.

The application discloses a kind of high-performance composite board and its preparation method, application, belong to high-performance material technical field.The high-performance composite board of the application includes top plate, bottom plate and the aluminum honeycomb core being arranged between the top plate and the bottom plate, aluminum honeycomb core includes the following mass percentage of elements:Zn:4.3%~5.5%, Mg:2.0%~2.5%, Cu:0.8%~1.2%, Zr:0.15%~0.23%, Mn:0.02%~0.06%, rare earth element:0.12%~0.3%, Ti:0.02%~0.04%, Si:0.3%~0.7%, Fe≤0.15%, impurity element≤0.01%, the balance is Al.The board is prepared by the way of combining wood material and aluminum alloy material, not only maintains the appearance and performance of wood, but also has the high strength and corrosion resistance of aluminum alloy material, the overall mechanical property is more excellent, not easy to crack, can also improve the sound insulation effect of composite board, endow product with higher value.

The invention relates to a tungsten-rhenium-tantalum alloy and a preparation method thereof, and belongs to the technical field of refractory metal alloy preparation. The preparation method of the tungsten-rhenium-tantalum alloy comprises the following steps: (1) performing stepped heating reduction on tungsten-rhenium-tantalum powder in a reducing atmosphere to obtain powder A; (2) adding carbon powder into the powder A, and carrying out ball milling and mixing under an anti-oxidation condition to obtain powder B; and (3) pressing the powder B into a green body, and sintering in a reducing atmosphere to obtain the tungsten-rhenium-tantalum alloy. The preparation method of the tungsten-rhenium-tantalum alloy is simple and convenient in process and high in practicability, the oxygen impurity content of the prepared tungsten-rhenium-tantalum alloy is remarkably reduced, the technical problem that the oxygen content is too high in a traditional preparation process is solved, and meanwhile a new thought is provided for preparation of other refractory metal alloys.

The invention discloses a high-heat-resistance magnesium alloy material and a preparation method thereof. The high-heat-resistance magnesium alloy material comprises 13-33% of rare earth elements; 0.2 to 1.0 percent of Zr element; impurity element < = 0.1%; and the balance of Mg element. Wherein the rare earth elements comprise two or more of Gd, Tb, Dy, Er, Lu and Tm, and contain Zr element; the impurity elements comprise Al, Cu, Fe, Ni and Si elements. The mass percent of each element is as follows: 3.0%-20% of Gd, 3.0%-20% of Tb, 3.0%-25% of Dy, 3.0%-28% of Er, 3.0%-30% of Lu and 3.0%-25% of Tm. 0.2 to 1.0 percent of Zr; al < = 0.02%, Cu < = 0.05%, Fe < = 0.05%, Ni < = 0.02% and Si < = 0.05%. The preparation method comprises alloy casting and heat treatment. After heat treatment, the room-temperature tensile strength of the high-heat-resistance magnesium alloy prepared through the method exceeds 370 MPa, and the percentage elongation after fracture is not lower than 3.0%; the strength of the alloy at the temperature of 250 DEG C or below is equivalent to the room-temperature strength, and the percentage elongation after fracture is slightly increased; and under the condition of 250 DEG C to 350 DEG C, relatively high strength is still maintained.