18results about How to "Increase volume fraction" patented technology

The vertical centrifugal discharging horizontal sand mill comprises a grinding rotor and a grinding cylinder, and a grinding block is arranged on the grinding rotor; an outlet of the grinding cylinder is formed in one side of the grinding cylinder and is communicated with a discharge hole of the horizontal sand mill; a separation pipeline is arranged between the outlet of the grinding cylinder and the discharge port of the horizontal sand mill, a first bulge is arranged on the inner wall of the separation pipeline, the first bulge is of a wavy structure with a plurality of continuous bulge parts, and the bulge parts closer to the discharge port of the horizontal sand mill are higher on the inner wall of the separation pipeline; a separation paddle is further arranged between the outlet of the separation pipeline and the discharge hole of the horizontal sand mill, the separation paddle comprises a paddle blade and a paddle hub used for mounting the paddle blade and driving the paddle blade to rotate, and the separation paddle endows the slurry with a vertically downward speed component through the paddle blade. According to the invention, ball leakage at the discharge port can be avoided by controlling the motion trail and speed of the material and the grinding medium, circulation of the grinding medium in the grinding cylinder is accelerated, and the grinding efficiency is improved.

The invention provides an aluminum-copper-cerium heat-resistant aluminum alloy and a preparation method thereof. The aluminum-copper-cerium heat-resistant aluminum alloy comprises the following components in percentage by weight: 7%-9.5% of Cu, 1.3%-2.3% of Ce, 0.1%-0.5% of Mn, 0.1%-0.4% of Sc, 0.1%-0.4% of Zr and the balance of Al and inevitable impurities. The structure morphology of the heat-resistant aluminum alloy is an isometric crystal, coarse precipitation Al3 (Sc, Zr) exists in the isometric crystal, and the heat-resistant aluminum alloy is an alpha-Al nucleating agent; a large number of high-thermal-stability L12Al3 (Sc, Zr) with the size smaller than or equal to 10 nm and a large number of Al2Cu nanoscale dispersed precipitated phases with the thickness smaller than or equal to 10 nm are separated out in crystal grains, and granular and lamellar Al24MnCu8Ce3, Al16Cu4Mn2Ce and Al8CeCu4 micron-scale heat-resistant intermetallic compound networks are continuously distributed along the crystal boundary. The heat-resistant aluminum alloy is excellent in high-temperature performance and high in high-temperature yield strength and tensile strength and is superior to a traditional ZL206 alloy (T6) and a traditional ZL207 alloy (T6), and the long-term service capacity of the cast heat-resistant aluminum alloy at the high temperature is remarkably improved.

This utility model discloses a system for combined denitrification under full-load conditions in a circulating fluidized bed boiler, comprising a wide-temperature-range SNCR denitrification module and a flue gas circulation module. The injectors in the wide-temperature-range SNCR denitrification module are arranged in the inlet flue of the high-temperature separator, the inlet flue of the high-temperature superheater, or the boiler furnace. The flue gas circulation module includes a flue gas circulation header and flue gas circulation branch pipes arranged along the flue gas flow direction. The flue gas circulation header connects to the flue gas circulation branch pipes, which are connected to the air preheater via a primary air fan. The inlet of the flue gas circulation header connects to the outlet of the induced draft fan. This utility model extends the lower limit of the conventional 800~1050℃ temperature window to 650℃. It uses ethanol as a low-temperature additive, resulting in relatively low denitrification costs and convenient ethanol addition and removal. Compared with existing SCR denitrification technology, the system is simpler and more economical. It does not require boiler modification, nor does it require additional denitrification reactors and catalysts, making the system relatively simple and facilitating switching between low-temperature denitrification mode and conventional denitrification mode.

The invention relates to the technical field of preparation of lead-free metal halide scintillator crystal powder, and particularly discloses chlorine zirconium cesium crystal powder for a composite scintillator and a confinement growth method of the chlorine zirconium cesium crystal powder. The cesium zirconium chloride crystal powder is cesium zirconium chloride-gas phase oxide composite powder formed on the micro-nano scale by means of in-situ crystallization, and the cesium zirconium chloride crystal powder is composed of 50-95.3 wt% of cesium zirconium chloride and 4.7-50 wt% of gas phase oxide. The preparation method comprises the following steps: preparing zirconium chloride-gas phase oxide powder, preparing a cesium chloride solution, mixing zirconium chloride-gas phase oxide slurry, and growing chlorine zirconium cesium crystal powder in an in-situ crystallization confinement range. The cesium zirconium chloride crystal powder prepared by the method has the advantages of adjustable particle size, stable suspension and efficient scintillation luminescence performance, solves the problem of crystal powder-polymer phase separation in a composite scintillator, and can be used for large-scale preparation of the composite scintillator in the field of radiation detection.

The present application relates to an Al-Zn alloy material and a preparation method thereof, the Al-Zn alloy material comprises the following components in percentage by weight: Zn 8-12 wt.%, Mg 2.8-3.2 wt.%, Cu 1.2-1.5 wt.%, Zr 0.1-0.2 wt.%, and the balance is Al. On the one hand, the high Zn content changes the nucleation and growth kinetics of the η' phase, and increases the volume fraction of intragranular precipitates. On the other hand, the Al3Zr dispersed phase formed by the Zr element effectively pins dislocations and grain boundaries, inhibits recrystallization and limits the segregation of solute atoms to grain boundaries, thereby significantly inhibiting the continuous precipitation of grain boundaries and the expansion of PFZ.

The invention discloses a creep-resistant magnesium alloy with high elasticity modulus and high damping and a preparation method thereof, and the creep-resistant magnesium alloy with high elasticity modulus and high damping comprises the following components in percentage by mass: 1.2%-3.5% of Zn element, 2.5%-12% of Gd element, 0.5%-6% of Yb element, 0.15%-1.2% of Ni element, 0.3%-0.8% of Mn element, 0-0.5% of Cu element, 0.1%-5% of HRE element and the balance of Mg element. The HRE element is one or more of a Dy element, a Sm element and a Tb element, and the mixing enthalpy delta H of the creep-resistant magnesium alloy with the high elastic modulus and the high damping is-1.1 kJ / mol to-0.2 kJ / mol. The creep-resistant magnesium alloy with high elastic modulus and high damping is suitable for the fields of aerospace, precise instruments, transportation, 3C electronics and the like, and has remarkable technical and economic values.

The present application relates to the technical field of biomass catalytic material, and particularly relates to a biomass waste derived biochar based single-atom catalyst and a preparation method thereof.A specific technical scheme is as follows: the preparation method of the biomass waste derived biochar based single-atom catalyst comprises the following steps: (1) after drying and grinding of agricultural and forestry waste, the agricultural and forestry waste is mixed with a nickel nitrate solution to obtain a mixture; (2) after drying of the mixture, the mixture is calcined under N2 atmosphere and negative pressure to obtain a biochar loaded nickel single-atom catalyst.The catalyst has the characteristics of low cost, simple and easy-to-operate preparation method, and excellent catalytic performance for tar high-temperature catalytic reforming reaction.

This invention discloses a method for preparing a high-strength, high-thermal-conductivity Mg-Zn-Cu-Mn magnesium alloy, belonging to the field of magnesium alloy preparation technology. Metal raw materials are prepared according to the atomic percentage ratio of each constituent element in the Mg-3Zn-3Cu-xMn alloy (0≤x≤1). Then, alloy melting, homogenization treatment, and hot extrusion deformation are performed sequentially. The extrusion temperature is 260-270℃, and the extrusion speed is 0.3-0.6 mm / s. This invention achieves homogeneous dispersion of Mn to cluster precipitation in the Mg-Zn-Cu magnesium alloy through Mn alloying modification treatment. When 0.6 wt.% Mn is added, the alloy exhibits the best thermal conductivity and tensile strength. This invention refines the grain size of the Mg-Zn-Cu-Mn magnesium alloy and eliminates some casting defects, thereby further improving the alloy's strength and thermal conductivity.

The invention belongs to the technical field of aluminum alloy materials, and particularly discloses a microalloyed aluminum-copper-cerium heat-resistant aluminum alloy and a preparation method thereof. The aluminum alloy comprises, by mass, 7%-9.5% of Cu, 1.3%-2.3% of Ce, 0.1%-0.5% of Mn, 0.1%-0.4% of Sc, 0.1%-0.4% of Zr, 0.1%-0.5% of Mg, 0.1%-0.3% of Si and the balance Al and inevitable impurities, the content relation of Cu and Ce is that Cu is equal to 2Ce + 4%-5%, and the content relation of Mg and Si is that Mg is larger than 1.5 Si. The aluminum alloy has high yield strength and high tensile strength in a high-temperature environment, the yield strength and the tensile strength at the temperature of 300 DEG C are 235-248 MPa and 245-257 MPa respectively, the ductility is 4-5%, the yield strength and the tensile strength at the temperature of 400 DEG C are 100-106 MPa and 105-110 MPa respectively, the ductility is 9-10%, and the aluminum alloy is obviously superior to a traditional ZL206 alloy and a traditional ZL207 alloy.

The application provides a B2 phase reinforced multi-principal element alloy for laser additive manufacturing and a preparation method thereof, and belongs to the technical field of metal laser additive manufacturing. By introducing Al elements and a small amount of W, Mo, Ta, V or Nb solid solution strengthening elements and trace amounts of B, Y, Ce, Zr or Hf grain boundary strengthening elements, a high volume fraction and excellent strengthening effect of fine B2 precipitated phases can be obtained without impairing the printability of the alloy laser additive manufacturing, the comprehensive mechanical properties of the B2 phase reinforced multi-principal element alloy are significantly improved, and the preparation of a new, high-performance and excellent printing performance B2 phase reinforced multi-principal element alloy by laser additive manufacturing is realized.

The invention discloses a preparation method of a high-strength heat-resistant high-damping Mg-RE-Zn alloy ring piece, which comprises the following steps: firstly, preparing the Mg-RE-Zn alloy ring piece by adopting a centrifugal casting-ring rolling process, and then carrying out aging treatment to obtain the high-strength heat-resistant high-damping Mg-RE-Zn alloy ring piece. According to the preparation method, the alloy with a bimodal structure, 14H-LPSO and a large number of high-temperature-resistant beta'precipitated phases and Mg5RE phases is prepared through specific components in combination with a specific casting process and aging treatment, the mechanical performance and the damping performance are synergistically improved, and the alloy has the excellent mechanical performance and damping performance at the room temperature; wherein the tensile strength is 415 MPa, the yield strength is 328 MPa, and the ductility is 6.3%; the damping performance is that epsilon is equal to 0.001, Q-1 is equal to 0.026, meanwhile, the damping material also has excellent mechanical performance at the high temperature of 300 DEG C, the tensile strength is 268 MPa, the yield strength is 172 MPa, and the ductility is 22.0%.

The invention discloses repair powder for repairing damaged high-aluminum high-titanium nickel-based cast superalloy after service. The repair powder comprises the following components in parts by mass: 5.0 to 10.0 parts of Cr, 6.0 to 12.0 parts of Co, 2.5 to 10.0 parts of W, 1.0 to 5.0 parts of Mo, 5.0 to 6.5 parts of Al, 0 to 1.5 parts of Ti, 10.0 to 15.0 parts of Ta, 1.0 to 5.0 parts of Re, 0 to 2.0 parts of Hf and 33 to 69.5 parts of Ni. The method for repairing the damaged part of the high-aluminum high-titanium nickel-based cast superalloy after service by using the repairing powder specifically comprises the following steps: step 1, marking a damaged area; 2, removing a damaged area; 3, laser cladding repairing is carried out; step 4, a destressing process; and fifthly, profile recovery is conducted, specifically, the repaired area is machined in the modes of grinding, polishing and the like, and the three-dimensional profile of the part is recovered. The problem that when existing powder for repairing the high Al + Ti nickel-based cast superalloy is used, the high-temperature mechanical property and the environment use performance of a repaired joint cannot be considered at the same time is solved.

The application provides a high-toughness ferrite-pearlite type non-quenched and tempered steel and a manufacturing method thereof, and the composition of the steel is as follows: C 0.35-0.42%, Si 0.35-0.45%, Mn 1.25-1.65%, P ≤0.010%, S 0.025-0.050%, Cr 0.10-0.30%, Nb 0.02-0.05%, Mo 0.010-0.050%, Ni 0.10-0.25%, Al 0.025-0.045%, V 0.10-0.30%, Cu ≤0.10%, Ti 0.010-0.040%, [N] 120-160ppm, [H] ≤1.0ppm, T.O ≤10ppm; the rest is Fe and inevitable impurity elements; the steel is combined with a controlled rolling and controlled cooling process, the ferrite content is increased, the strength and toughness are improved, the strength and toughness are matched, and the cutting performance is improved.

The invention discloses a 1.5 GPa-grade precipitation strengthening type multi-principal-element alloy and a heat treatment method thereof, and belongs to the technical field of novel metal materials. On the basis of an AlCrFeNi series FCC / B2 double-phase multi-principal-element alloy, a novel double-stage solid solution coupling aging heat treatment process which is simple in procedure and low in cost is developed. According to the process, a multi-level and multi-mode precipitated phase structure is introduced, and the mechanical property of the as-cast FCC / B2 double-phase multi-principal-element alloy is remarkably improved. The yield strength and the tensile strength of the alloy at the room temperature are up to 1050 MPa and 1567 MPa correspondingly, and the requirements of the aerospace field for high-strength and high-toughness metal materials are met. The heat treatment technology shows huge potential in the aspect of improving the comprehensive mechanical property of the FCC / B2 double-phase multi-principal-element alloy, and practical application of the alloy in the key fields of aero-engine components, rocket structural parts and the like can be powerfully promoted.

This invention relates to an apparatus and method for improving process efficiency, belonging to the field of hypergravity technology. The apparatus includes a hypergravity device body and a liquid inlet and a liquid outlet disposed on the hypergravity device body; the hypergravity device body has a rotating shaft and a rotor rotatable around the rotating shaft inside; and a liquid level control mechanism is provided at the liquid outlet. The method involves controlling the liquid level inside the hypergravity device through the liquid level control mechanism, causing liquid to accumulate at the bottom, so that a dispersed liquid in the upper part and a continuous liquid in the lower part exist simultaneously inside the hypergravity device. This invention utilizes the stagnant liquid phenomenon within the hypergravity device to increase the residence time of the liquid within the device and the liquid volume fraction in the rotor and the upper cavity, thereby improving mass transfer and increasing process efficiency.

The present invention relates to a homogenized diamond / silicon carbide composite material and a preparation method and application thereof, and more specifically, it relates to a homogenized diamond / silicon carbide composite material, based on a solvent thermal process, firstly, diamond particles are impregnated in a precursor reaction solution to obtain a blend of diamond and the precursor reaction solution, then the blend is heated for gel-curing, and then carbonized and siliconized to obtain a homogenized diamond / silicon carbide composite material. The preparation method of the present invention solves the problems of uneven distribution of silicon carbide and silicon and poor comprehensive performance in the prior art.

The present invention relates to a wind turbine blade comprising a lightning protection system with at least one tip end lightning receptor arranged at an outer surface of the blade and a down conductor extending within the blade. The blade comprises carbon fibre reinforced spar caps, wherein a conductive fabric forms an electric connection between the tip end of spar cap and the lightning receptor.

The present invention provides an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, which contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.05-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, 0-0.01% Be by mass, and 0.0001-0.1% RE by mass. The present invention also provides a preparation method and a heat dissipation structure of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy.