282results about How to "Good refinement effect" patented technology

The invention discloses a three-dimensional structural description method of hepatic vascular system, which belongs to the field of medical liver division. The method comprises the following steps of: firstly, dividing a hepatic image and a hepatic vascular image, structurally analyzing the hepatic vascular three-dimensional image, skeletonizing the liver and the blood vessel, and marking the skeletonized voxel points; next, storing the marked voxel points to data structure of multi-branch tree; then, distinguishing main and branch blood vessels according to master slave relation of the voxelpoints in the multi-branch tree; finally, dividing the liver body into multiple liver segments according to relation between the blood vessels in the hepatic vascular system. By the three-dimensionalstructural description method of hepatic vascular system, accurate division of liver is realized so that guidance is provided for accurate removal of liver.

The invention discloses a titanium silicon nitride core-spun yarn which comprises a core layer and a steel sheet layer wrapped outside the core layer, wherein the core layer is a titanium silicon nitride alloy layer; a network support layer prepared from steel or iron is arranged between the core layer and steel sheet layer; and the titanium silicon nitride alloy layer is composed of titanium silicon nitride alloy particles with the particle size of less than 3mm. The Ti and the carbon or nitrogen in the steel form nano-size compounds which have favorable refinement effect on the structure, thereby enhancing the strength of the ferrous material, enhancing the TiN particle stability by nitridation and effectively preventing the austenite grains from growth. The titanium silicon nitride core-spun yarn sufficiently utilizes the cheap nitrogen element, and can save the titanium addition amount on the premise of ensuring certain strength level, thereby further lowering the cost of the non-quenched and tempered steel.

The invention belongs to the field of the preparation of metal materials, and particularly relates to an auxiliary semi-continuous casting crystallizer for a low-frequency pulsed magnetic field of magnesium alloy and application thereof. The top of a casing of the crystallizer is provided with an upper cover of the crystallizer, the casing of the crystallizer and the position of a center hole of the upper cover of the crystallizer are provided with an inner sleeve of the crystallizer, a cooling water tank is formed between the casing of the crystallizer and the upper cover of the crystallizer, an excitation coil is arranged in the cooling water tank, the outer side of the casing of the crystallizer is provided with a water inlet communicated with the cooling water tank, and a secondary cooling water spraying hole communicated with the cooling water tank is arranged on the inner sleeve of the crystallizer. The casing and the upper cover of the crystallizer are made of stainless steel, and the inner sleeve of the crystallizer is made of a 4XXX family of aluminum alloy; and moreover, an upper opening of the inner sleeve of the crystallizer is higher than the upper surface of the upper cover, and a horn shape is formed between the upper opening and a lower opening. The auxiliary semi-continuous casting crystallizer for the low-frequency pulsed magnetic field of the magnesium alloyis used for the semi-continuous casting of the magnesium alloy, the forced convection of a melt is generated by utilizing pulsed electromagnetic force generated by the auxiliary semi-continuous casting crystallizer for the low-frequency pulsed magnetic field of the magnesium alloy to act on the melt of the magnesium alloy inside the crystallizer, bulky dendritic crystals are fragmented, the nucleation rate is increased, and the thinning effect of the crystal grains of a semi-continuous cast rod of the magnesium alloy is obvious.

The present invention is preparation process of composite Al-Ti-C grain refining agent for aluminum and aluminum alloy with raised cooling speed, less Ti-C particle interface aggregation and raised Al-Ti-C grain refining performance. The preparation process includes: mixing material in certain weight proportion, pressing the mixture into cylindrical prefabricated block, stoving at 15-200 deg.c for 2 hr, pressing prefabricated block into aluminum melt at 760-820 deg.c to reach Ti content of 3-5%, hot-blast synthesis reaction and maintaining at 760-820 deg.c for 2 min, stirring the aluminum melt mechanically at 60-100 rpm for 5-10 min for the synthesized material to be diluted and dispersed well in the aluminum melt, standing for 5-10 min and casting in metal mold to obtain the product.

The invention provides an Al-M-B grain refiner for casting an Al-Si alloy and a preparation method thereof. The Al-M-B refiner for casting the Al-Si alloy is composed of the components by mass: 85.0-96.0% of Al, 3.5-10.0% of M and 0.5-5.0% of B; the Al-M-B refiner contains refined particle phase MAl3 and MB2. The Al-M-B grain refiner is prepared by a fluoride salt method with Al blocks, K2TiF6 powder, Nb powder and KBF4 powder as raw materials. The Al-M-B alloy is prepared by melting. The prepared Al-M-B refiner can refine the grain size of alpha-Al in a high-silicon aluminum alloy to 700 microns or less, optimally to 200 microns or less; the amount of Nb is reduced and the cost of raw materials is reduced; the Al-M-B refiner has durable performance and is not easy to settle down and fail,and the refinement effect can still be less than 350 microns after heat preservation is performed for 2 h; the preparation method has the advantages of simple equipment conditions required for preparation and simple operation, and is suitable for industrial production.

The invention relates grain refiner used for synthesizing aluminum alloy by laser firing and preparing method. The grain refiner comprises Al, Ti and B. The method comprises the following steps: mixing the Al, Ti, B and TiH2 powers with blending attachment, adding the powders into die and pressing them to preformed sample, after evacuating and filling argon gas, utilizing the laser to carry out self-propagating reaction of preformed sample and get grain refiner. The grain refiner possesses good refining effect and decline-resistant capability. The invention suits for aluminum alloy handling field.

The invention relates to an aluminum-titanium-boron-strontium alloy refining and modifying agent, and belongs to a flux for casting. Aiming at the problem that an aluminum-titanium-boron alloy is used for refining and an aluminum-strontium intermediate alloy is used for modifying in turn to cause high labor and time consumption in the conventional process for treating a eutectic or hypoeutectic aluminum-silicon alloy melt, the invention provides the aluminum-titanium-boron-strontium alloy refining and modifying agent for refining and modifying simultaneously. The refining and modifying agent is characterized by comprising the following components in percentage by weight: 3 to 7 percent of titanium, 0.4 to 1.0 percent of boron, 7 to 11 percent of strontium and the balance of aluminum. During use, the refining and modifying agent is preheated, 0.4 weight percent of preheated refining and modifying agent is added into a 710 to 730 DEG C eutectic or hypo-eutectic aluminum-silicon alloy melt at one time, and melted after 3 to 5 minutes, the mixture is uniformly stirred, stood for 5 to 7 minutes and is subjected to slagging off, and casting operation is performed. Compared with the conventional two-time separate refining and modifying operation, the simultaneous refining and modifying operation has the advantages that: the labor and time consumption is low and the refining and modifying effects of the treated eutectic or hypoeutectic aluminum-silicon alloy are good through probation.

The invention discloses an aluminum alloy welding wire and a preparation method thereof. The aluminum alloy welding wire consists of the following components in percentage by weight: 5.5-6% of Mg, 0.1-0.15% of Ti, 0.1-0.3% of Cr, 0.08-0.18% of Mn, 0.05-0.2% of Sc, 0.1-0.18% of Nd, 1-2% of Mo, 1-2% of W, 0.2-0.8% of V, 0.01-0.05% of Bi, 2-5% of Cu, 0.25-0.35% of Zr, 0.1-0.25% of Ag, less than or equal to 0.25% of Si, less than or equal to 0.2% of Fe, less than or equal to 0.20% of Zn, less than or equal to 0.15% of other impurity elements each being less than or equal to 0.05%, and the balance Al. The aluminum alloy welding wire disclosed by the invention is compact in tissue and is smooth in surface; and tensile strength, cracking resistance, wear resistance and corrosion resistance of a welding seam are good.

The invention relates to a high-performance magnesium alloy or magnesium-based composite material. The grain size of the prepared material matrix is in nano scale. The material has the characteristics of high strength and high toughness and belongs to the field of preparation of new materials. A cast state or deformation state magnesium alloy or magnesium-based composite material is subjected to cryogenic-low heat circulation treatment by controlling important parameters such as cryogenic temperature, cold treatment time, cold heat circulation times, low-heat temperature, heat treatment time and the like; the magnesium material after treatment has a nanocrystal microstructure and corresponds to the mechanical properties of high strength and high toughness. A preparation method of the high-performance magnesium material has the advantages of 'high performance, high efficiency, low cost and low pollution'.

The invention discloses a composite grain finer for Mg-Al alloy and a preparation method thereof. The composite finer comprises the following components: 50-60 percent of Al, 1-5 percent of C, 5-10.5 percent of Ca or 5-10.5 percent of Sr, and the balance of Mg. The preparation method comprises the following steps of: melting pure Al under 700-800 DEG C, adding Mg-CA or Mg-Sr intermediate alloy according to the formula, and compensating the insufficient Mg with pure Mg to obtain Al-Mg-Ca or Al-Mg-Sr intermediate alloy melt, cooling the melt to 600-650 DEG C, uniformly dispersing graphite powder into the melt by using a semi-solid stirring method, and casting to obtain the composite grain finer. The finer has the advantages of simple preparation method, easy batch production, easy control of the addition amount, no discharge of pollutant and particularly remarkable fining effect for the Mg-Al alloy with low Al content.

The invention discloses a machining method for an aluminum alloy turbine blade of an aero-engine, and belongs to the technical field of machining for turbine blades of aero-engines. The machining method comprises the following steps: casting the aluminum alloy turbine blade, carrying out film hole machining through a machining method of ultrafast laser annular cutting and spiral scanning, and removing a remelted layer through abrasive particle flow machining and a melted layer removal solution. According to the machining method disclosed by the invention, the film hole machining is carried outthrough the machining method of ultrafast laser annular cutting and spiral scanning, so that the heat effect can be greatly reduced and the surface integrity is improved, the machined film hole has few burrs, grooves and micro-cracks, and the maximum thickness of the remelted layer is not greater than 25[mu]m. Abrasive particles uniformly grind the surface or the corners of a channel under a pressure effect, so that allowance can be removed, the effects of deburring, chamfering and polishing can also be acted, the remelted layer can also be effectively reduced, a hole diameter increment is controlled to be 0.02mm to 0.04mm, and the remelted layer and the micro-cracks can be effectively controlled. The remelted layer is further removed through the remelted layer removal solution, so that no remelted layer residue at the inlet-outlet of the film hole can be achieved.

The invention relates to a hypoeutectic Al-Si alloy material for an all-aluminum engine of a high-grade car and a preparation method of the hypoeutectic Al-Si alloy material. The hypoeutectic Al-Si alloy material with high strength and high toughness is researched by adding Cu and Mn strengthening elements and a Sr modification element, improving an industrial silicon melting process and adopting a process for removing gas and residues in a furnace and a casting process and a technology for detecting refinement and modification of alloy on line through thermal analysis. The hypoeutectic Al-Si alloy material has the tensile strength of 338-345Mpa and the elongation rate of 8.5-9.2% and can be completely applied to the all-aluminum engine of the high-grade car at home and abroad.