95results about How to "Increase the number of nuclei" patented technology

The invention relates to a light gauge aluminum foil woolen produced with AL-Ti-C wire refiner and a preparation method. The iron-silicon rate of the woolen ranges between 4.3-5.3. The process of the preparation technology is sequentially as follows: material preparation, batching, feeding, melting, stirring, primary refining of a smelting furnace, drossing, sampling, ingredient adjustment, secondary refining of the smelting surface, drossing, converter, primary refining in a holding furnace, intensified refining in the holding furnace, online addition of AL-Ti-C wire intermediate alloy refiner, Ar online degassing, filtration, continuous casting into 7.0-7.5mm cast rolling plates, cold rolling, high-temperature homogenizing annealing of a primary sheet strap, cold rolling, trimming of a rereeling machine, cold rolling, intermediate annealing of a secondary sheet strap, cold rolling to 0.26-0.32mm, trimming of the rereeling machine, and packaging. The cost is low, the quality is stable, the calendaring of the aluminum foil and grain refining are good in effect, and the probability of generating pinholes is low during production.

The invention relates to a synthesized multilevel structure ZSM-5 zeolite molecular sieve with intracrystalline meso pores and intercrystalline meso pores, as well as a synthetic method and an application thereof. Except micropores of the zeolite structure, the multilevel structure ZSM-5 zeolite molecular sieve comprises the intracrystalline mesoporous and intercrystalline mesoporous structure, wherein primary nanometer crystal grain size is 40-500nm, and secondary accumulated particle size is 500nm-5[mu]m. The structure greatly improves diffusion performance and the catalyst activity of the molecular sieve, reduces possibility of generation of side reaction and carbon deposit, improves carbon accommodating capability of the molecular sieve catalyst, and prolongs life of the catalyst.

The invention discloses a polyformaldehyde composition and a preparation method thereof. The polyformaldehyde composition contains by part of weight: 100 parts of acetal resins, 0.01-2 parts of oxidation inhibitors, 0.01-2 parts of formaldehyde catching agents, 0.01-2 parts of formic acid catching agents and 0.01-5 parts of crosslinking acetal resins. Compared with the prior art, the crosslinking acetal resins serve as nucleating agents and are obvious in nucleating effects, and a great number of crystal nucleuses are formed before crystallization of the acetal resins, so that crystallization of the acetal resin is induced, the number of the crystal nucleuses is improved, crystallization degree and temperature are improved, sphaerocrystal dimension is lowered, and accordingly crystallization structure of the acetal resin is improved. Further, due to the fact that the adding amount of the crosslinking acetal resins is small, and bad influence on mechanical property, thermal performance and surface morphology of the polyformaldehyde composition is avoided. Experiment results prove that the sphaerocrystal dimension of the polyformaldehyde composition is about 40 mu m, and the polyformaldehyde composition has good crystalline structure and good mechanical property.

The invention discloses a hot rolled bainitic steel rail and a production process. The hot rolled bainitic steel rail comprises the following chemical compositions in percentage by weight: 0.10 to 0.35 percent of C, 0.80 to 2.00 percent of Si, 0.80 to 3.30 percent of Mn, less than 2.00 percent of Cr, 0.0010 to 0.0100 percent of N, 0.01 to 0.10 percent of Nb, 0.02 to 0.2 percent of V, 0.005 to 0.06 percent of Ti, 0.10 to 0.40 percent of Mo, less than 0.00005 percent of H and the balance of Fe and inevitable impurities. The process is characterized in that: a hole pattern method is adopted for the rough rolling of the steel rail, a universal method is adopted for the precision rolling of the steel rail, the rolling interval of adjacent passes in the rough rolling is controlled to more than 5 seconds and not more than 35 seconds, and the steel rail after the rolling is naturally cooled in the air to room temperature. The production process limits the size of residual austnesite in M-A islands and between lath bainitic ferrite; the proportion of the lath bainitic ferrite is over 75 percent; comprehensive indexes of performance such as specific elongation and the like are improved; and the production process can be also applied to turnout bainitic steel rails and bainitic AT rails.

The invention provides a polycrystalline silicon ingot furnace and a method for preparing a polycrystalline silicon ingot with even and fine crystalline grains. The polycrystalline silicon ingot furnace comprises a heat insulating cage lifting mechanism, an upper furnace body, a heat insulating cage, a crucible assembly, a directional coagulantion enhancement block, a lower furnace body, a support pillar and an ultrasonic generator, wherein the ultrasonic generator is arranged at the bottom of the outer wall of the lower furnace body, or on the side surface of the outer wall of the upper furnace body. The polycrystalline silicon ingot furnace and the method are characterized in that in the process of producing the polycrystalline silicon ingot, the ultrasonic generator is opened when the polycrystalline melt is in critical nucleation state, and the ultrasonic generator is closed in 1-20 min, and mechanical oscillation is introduced in initial stage of polycrystalline nucleation, so that the polycrystalline silicon ingot with even and fine in crystalline grains can be formed.

The invention relates to a battery cathode diachylon formulation high in utilization rate of active substance and a preparation method of the battery cathode diachylon formulation and belongs to the technical field of lead-acid storage batteries. The the battery cathode diachylon formulation comprises dilute sulfuric acid of 1.38g/ml in density, deionized water, lignin Vanisperse AT, polyaniline potassium sulfonate PAN-K, nano hollow barium sulfate, acetylene black, emulsion carbon naotube Sus-CNT and lead powder. On the basis of a conventional cathode diachylon formulation, water-soluble PAN-K is adopted to completely replace conventional polyester staple fiber, nano hollow barium sulfate is adopted to completely replace conventional precipitated barium sulfate, and the emulsion carbon nanotube Sus-CNT is adopted to partly replace deionized water for paste mixing. On the premise that circulating life of a cathode produced by the formulation is not shortened, active substance utilization rate and charging receiving capability of the cathode are remarkably improved, and the battery cathode diachylon formulation is about to have great application and popularization prospect in the field of lowering weight of active substance of the cathode and lowering manufacturing cost of the lead-acid storage batteries.

The invention provides a refiner for aluminum alloy and a preparation method. The refiner for the aluminum alloy comprises, by weight, the components of 4.5-5.5% of titanium, 0.2-0.4% of cerium, 0.6-1.8% of magnesium and the balance aluminum. The refining effects of two refiners of Al-5Ti and Al-5Ti-0.7Mg-0.3Ce on Ai-Si alloy are compared to find that the refining effect of the Al-5Ti-0.7Mg-0.3Ce is better than that of the Al-5Ti due to the fact that the size of Al3Ti in the Al-5Ti-0.7Mg-0.3Ce is obviously smaller than that of the Al-5Ti in the Al-5Ti-0.7Mg-0.3Ce, therefore, the quantity of heterogeneous nucleation is increased, and the refining effect is more obvious; in addition, an element Mg and rare earth elements are filled in the interface of an alpha-Al dendritic crystal and eutectic silicon, therefore, the growth of the alpha-Al dendritic crystal is prevented, the improvement of the refining effect is facilitated, and more remarkable, the improvement effect of the interaction effect of the element Mg and the rare earth elements for a refining structure is more obvious than that of a single rare earth element.

The invention discloses a crystallization accelerating agent for crystallization/semi-crystallization polyurethane and a preparing method and application thereof.In the prior art, control over the crystallization morphology and the crystallization speed of the crystallization/semi-crystallization-type polyurethane does not exist, and the advantage of a crystallization/semi-crystallization polymer can not be most effectively developed.According to the crystallization accelerating agent, polyester diol serves as a structural body, and closed isocyanate serves as a potential reactive functional group.The crystallization accelerating agent is applied to the crystallization/semi-crystallization polyurethane, the crystallization speed can be increased, and the crystallization morphology can be improved; in the use process or the heat existing process, the potential closed isocyanate functional group can be further reacted with polyurethane resin or an active group on a contact base material, and hardness, strength and aging resistance are improved.

The invention discloses a colloid titanium surface conditioner which is prepared from the following raw materials in parts by weight: 20-23 parts of sodium hydroxide, 36-40 parts of phosphoric acid, 13-16 parts of titanyl sulfate mixed liquid and 24-30 parts of sodium tripolyphosphate. By adopting the colloid titanium surface conditioner, a phosphate coating crystal is denser and more uniform, the adhesion and corrosion resistance are remarkably improved, all growth process of a conversion coating can be finished at relatively low temperature within relatively short time, the phosphating coating speed is particularly high, and complete lamination can be realized by 30 seconds of phosphating.

The invention relates to the field of laser cladding materials, and discloses nickel-based multi-component laser cladding powder. The powder comprises, by mass, 10-25% of Fe, 6-15% of Al, 1-5% of TiB2, 0.5-1.0% of Dy and the balance Ni. The invention further discloses a laser cladding method for the powder. The method comprises the steps that the nickel-based multi-component laser cladding powder and absolute ethyl alcohol are mixed, the surface of a cladding base material is evenly covered with the mixture, drying is carried out after roll pressing, a preformed layer is formed, and the cladding layer can be obtained through laser cladding. By means of the technology, the crack-free laser cladding layer can be obtained, the hardness is high, the cost is low, the fusion degree is improved, the strength and plasticity are ensured, and the powder is suitable for repair machining of various parts.

The invention discloses a chemical nickel plating solution with high corrosion resistance and stability on the surface of an aluminum alloy and a preparation method and application of the chemical nickel plating solution. The chemical nickel plating solution is composed of deionized water, main salt, a reducing agent, a complexing agent, a buffering agent, a stabilizer and a brightener. The main salt is nickel sulfate, the reducing agent is sodium hypophosphite, the complexing agent is composed of glycine and lactic acid, the buffering agent is composed of sodium tetraborate and succinic acid,the stabilizer is composed of cobalt nitrate and potassium iodide, and the brightener is polyethylene glycol. An environmental-friendly chemical nickel plating system with high corrosion resistance and high stability and a simple and efficient pretreatment process are developed, so that the process flow is simplified, the production cost is reduced, and the corrosion resistance of the aluminum alloy is greatly improved.

The invention belongs to the technical field of material chemistry, and particularly relates to a modified spherified core-spun wire and a preparation method thereof. The modified spherified core-spunwire comprises, by mass part, 60 wt% to 90 wt% of spherified core-spun wires, 10 wt% to 20 wt% of micron silicon carbide and 2 wt% to 10 wt% of nano silicon carbide. According to the modified spherified core-spun wire and the preparation method thereof, the nucleation number of CADI can be increased, and the spherifying process can be optimized.

The invention relates to a production method of a lathe bed casting and application, in particular to a vibration-solidified low-stress lathe bed casting and a casting method thereof. The casting method comprises the steps that a sand mould of the lathe bed casting is firstly manufactured; liquid metal is smelted and poured; and three-dimensional vibration solidification is performed. For three-dimensional vibration solidification, through a wavelet spectral analysis technology, after a casting mould cavity is filled with molten iron, a 10-200 Hz low-frequency three-dimensional resonance field is applied; when the molten iron is cooled to a temperature in the range of a Fe-C eutectic point+/-50 DEG C, 200-2000 Hz high-frequency three-dimensional resonance is performed; the casting sand mould is subjected to still standing; a riser and a runner are cut off; and a flash is ground and removed. The low-frequency three-dimensional resonance field enables the mould cavity to be fully filled with the liquid metal, so that pores, impurity mingling, segregation, cavity shrinkage and other casting defects which often happen during a traditional casting process are overcome; by utilizing the high-frequency three-dimensional resonance, the supercooling degree of the molten iron is improved; solidification nucleation is facilitated; the number of nucleation is increased; and the structure refinement of crystals is facilitated. The casting method is simple in process, low in cost, simple for operation and wide in application range and is pollution-free; the quality of the casting can be obviously improved; and the residual stress of the casting is lowered.

The present invention discloses use of deoxyribonucleic acid in promoting of protein crystallization. The deoxyribonucleic acid can significantly increase the efficiency and success rate of the protein crystallization.

The invention discloses a preparation method of nano-molybdenum powder doped with yttrium oxide nano-particles. The preparation method comprises the following steps of 1, dispersing commercial micron-sized molybdenum trioxide and carbon nano-particles in a solution, and conducting drying by distillation to obtain composite powder; 2, spraying the ultrafine/nanometer yttrium salt liquid drops intothe composite powder, and conducting drying to obtain a yttrium salt-containing mixture; 3, carrying out segmented heat preservation and reduction on the yttrium salt-containing mixture to obtain ultrafine doped MoO2; and 4, conducting reduction on the ultrafine doped MoO2 by hydrogen to obtain nano-molybdenum powder doped with yttrium oxide nano-particles. The invention also provides an application of the nano-molybdenum powder doped with the yttrium oxide nanoparticles to sintering preparation of a nano-structure oxide dispersion strengthened molybdenum alloy. According to the preparation method, two-step reduction is combined with preparation of the composite powder, so that the nucleation number of a reduction product is increased, the granularity of the reduction product is refined, the granularity of the doping yttrium oxide nano-particles and molybdenum powder is regulated and controlled, and the raw material cost is reduced. The application method is simple and easy to implement.

The invention discloses a rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding and relates to the technical field of welding. The rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding aim to solve the problem that after existing thin plate NiTi alloy electron beam welding, crystalline grains in a connector are coarse. The rapid cooling solidification fine crystal device comprises a pressing and grasping type fixture body, cooled red copper and a cooled red copper fastening mechanism; and the cooled red copper is arranged over the pressing and grasping type fixture body through the cooled red copper fastening mechanism. The welding method includes the steps of performing pretreatment on to-be-welded base metal, clamping the to-be-welded base metal, clamping the cooled red copper fastening mechanism, performing welding and performing cooling. The rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding are used for thin plate NiTi alloy electron beam welding.

The invention belongs to the technical field of material chemistry, and particularly relates to a modified nucleating agent and a preparation method thereof. The modified nucleating agent is preparedfrom the following raw materials in percentage by mass: 60 to 90 weight percent of nucleating agents, 10 to 20 weight percent of micrometer silicon carbide and 2 to 10 weight percent of nanometer silicon carbide. The modified nucleating agent provided by the invention can increase the nucleation quantity of CADI (Carbonic Austempering Ductile Iron); the spheroidization process is optimized.

The invention discloses a brush plating-based surface enhanced Raman spectrum SERS silver-plated active substrate and a preparation method thereof, and relates to the technical field of Raman spectrumdetection. The brush plating process is combined with the preparation process of the surface-enhanced Raman spectrum silver-plated active substrate, and the nucleation mechanism of silver crystal grains is converted into the instantaneous nucleation mechanism according to the preparation requirements of the surface of the surface-enhanced Raman spectrum silver-plated active substrate, that is a silver crystal nucleus generation accelerant is added into the prepared brush plating working solution, so that the nucleation quantity in unit time is increased, fine grains are facilitated to be achieved, and all of the best working parameters of the electric brush plating technology are further obtained; and the surface-enhanced Raman spectrum SERS silver-plated active substrate with nano-sizedsilver particles and good uniformity is prepared by a simple preparation process, so that the technical problems of poorer sensitivity and stability of a Raman spectrum metal active substrate in SERSdetection can be solved, and the technical effect of improving the sensitivity and stability of the Raman spectrum metal active substrate in SERS detection is achieved.