64results about How to "Control pore structure" patented technology

The invention discloses a method for performing three-dimensional printing on a biological ceramic bracket based on light-cured molding. The method comprises the following steps: firstly, mixing biological ceramic, a biological glass sintering aid and resin premixed liquid uniformly to obtain photosensitive ceramic slurry; putting the photosensitive ceramic slurry on light-cured molding equipment, and performing three-dimensional printing on a biological ceramic bracket green body according to a three-dimensional model which is input into a forming machine; drying, degreasing and sintering the biological bracket green body to obtain the biological ceramic bracket. The biological ceramic bracket has the following characteristics: the three-dimensional size is not limited, the strength is high, 100 percent of three-dimensional holes are communicated, and the hole structure is accurately controllable, and the application prospect in the field of a bone defect repairing material is good.

The invention relates to a method for preparing a ceramic particle reinforced foamed aluminum-matrix composite material, which relates to a method for preparing a foamed aluminum-matrix composite material. The method solves the problems of high production cost and nonuniform pore distribution of the obtained foamed aluminum-matrix composite material due to a foaming agent TiH2 adopted in a conventional melt-foaming method which is expensive, needs pretreatment and has a difficultly controlled decomposition rate. The method comprises the following steps of: mixing aluminum alloy powder, ceramic particles and calcium carbonate (CaCO3) powder and placing a mixture into a graphite mould; placing the graphite mould into a vacuum hotpressing sintering furnace to prepare a prefabricated body; and performing forward extrusion, heating and foaming on the prefabricated body to obtain the ceramic particle reinforced foamed aluminum-matrix composite material. By using a powder metallurgic method and taking the CaCO3 powder as a foaming agent, the method has the advantages of low price, no pretreatment, simple process, stable decomposition rate, convenience for industrial production and uniform pore distribution of the obtained composite material which has a pore diameter of 0.5 to 2 mm, a porosity of 40 to 82 percent and a compressive yield strength of 36 to 70 MPa.

The invention provides a vacuum concrete mixing process. The vacuum concrete mixing process is characterized in that via simple structural modification, after a mixing drum of a mixer is sealed, the interior of the mixing drum is vacuumized, that is, before mixing, a certain vacuum degree is formed in the mixing drum, so that contact between freshly mixed concrete slurry and air in the mechanical mixing process is greatly reduced, formation of bubbles in concrete is reduced, and accordingly, the porosity is greatly reduced. Furthermore, the minimum pressure in the mixing drum is controlled, so that the ambient temperature is lower than the boiling point of moisture in the mixing drum, accordingly, moisture evaporation is avoided, the phenomenon that pores are formed by moisture evaporation is prevented, and the porosity is further reduced. The vacuum concrete mixing process is simple, is convenient to operate, and can efficiently improve the concrete compactness, strength and durability.

The invention relates to an adsorbent for efficiently adsorbing sulfate ions in water, and a preparation method thereof. In the prior art, the removal efficiency of the sulfate ions in the industrialwastewater is not high. A purpose of the present invention is mainly to solve the problem in the prior art. According to the technical scheme, a hydrotalcite-like structure CaxMn6-xFe2(OH)18.4H2O as an adsorbent is prepared by combining co-precipitation and hydrothermal treatment, and x is 3-5.5. With the technical scheme, the problem in the prior art is well solved. According to the present invention, the adsorbent prepared by the method can efficiently remove sulfate ions from water, and can be used in the field of environmental protection.

The invention discloses a preparation method for a carbon-based zeolite molecular sieve composite separation membrane. The preparation method comprises the following concrete steps: with phenolic resin as a raw material, preparing a binder, a pore-forming agent and the like, uniformly mixing the phenolic resin, the binder, the pore-forming agent and the like, carrying out extrusion on a molding machine so as to form a tubular original membrane, and carrying out natural drying and carbonization treatment so as to prepare a tubular carbon supporting membrane; synthesizing a zeolite molecular sieve sol from Al2O3, SiO2, Na2O, H2O and EtOH in a certain molar ratio according to a certain addition order under the condition of stirring through a feeding method; placing the tubular carbon supporting membrane into a crystallization vessel filled with the zeolite molecular sieve sol, placing the crystallization vessel into an oven, carrying out crystallization, taking a crystallized membrane outof the oven, carrying out quenching, cleaning and drying, and removing a template agent so as to prepare the carbon-based zeolite molecular sieve composite separation membrane. The invention relatesto the technical field of zeolite molecular sieve composite membranes. The preparation method provided by the invention has the following advantages: a layer of a zeolite molecular sieve material is compounded onto the surface of a carbon supporting body, so the pore structure of the surface of a carbon membrane can be controlled; the gas permeability of the carbon membrane is improved; and a separation membrane with good oxidation resistance can be prepared.

The invention discloses a preparation method of a lignin-based mesoporous carbon material. The preparation method comprises the following steps: crushing straw, adding the crushed straw into an alkaline solution, carrying out a reaction for 0.5-5 hours to obtain a reaction solution, adjusting the pH value to 5-12 by using an acid, and then carrying out sedimentation, washing and drying to obtain lignin with a high silicon content; putting the lignin with a high silicon content in an inert atmosphere furnace, carrying out heating to 500-1000 DEG C at a temperature rising rate of 1-20 DEG C / min,and carrying out heat-preservation carbonization for 0.5-5 hours; finally mixing the carbonized lignin with a potassium hydroxide solution, putting the mixture into an inert atmosphere furnace, carrying out heating to 500-1000 DEG C at a temperature rising rate of 1-20 DEG C / min, and carrying out a heat-preservation carbonization reaction for 0.5-5 hours; and carrying out cooling to normal temperature, sequentially carrying out washing with acidic water and pure water to neutrality, and carrying out drying to obtain the mesoporous carbon material. The preparation process of the method provided by the invention is simple, the solvent can be recycled, the preparation process is simple, the conditions are mild, and the pore structure of the mesoporous carbon material can be accurately controlled.

A spherical asphalt-base activated carbon rich in mesopores is prepared from petroleum or coking by-product through preparing the asphalt with high softening point, adding arylhydrocarbon and thermosetting phenolic resin, spherisizing, oxidizing, charring and activating.

The invention discloses an adsorbent for removing nitric oxide in fluid as well as a preparation method and application of the adsorbent. The composition of the adsorbent is Ni<x> Mg<6-x>Fe<2>O<9> or Ni<x>Mg<6-x> Al<2>O<9>, wherein x is equal to 1-6. The preparation method of the adsorbent comprises the following steps of: dropwise adding an alkaline solution into a solution containing nickel, magnesium and iron or aluminum to carry out precipitation reaction, and then carrying out hydrothermal crystallization, drying, roasting and the like to obtain the adsorbent. The adsorbent has the characteristics of high efficiency of removing nitrogen oxide in fluid, simple preparation method, environment-friendly and pollution-free production process, simple operation and the like.