30results about How to "Precise control of porosity" patented technology

The present invention provides a sintering control method of ceramic manufacturing. The method includes the following steps: S1: preparing a pore-forming agent containing a porogen; S2: mixing the pore-forming agent with a ceramic slurry and forming a greenpart; S3: sintering the greenpart at a first temperature in an oxygen-free environment to form a semi-finished object; and S4: sintering the semi-finished object at a second temperature in an oxygen-containing environment to form a ceramic article. Wherein, the first temperature is higher than the second temperature. While the porogen is a carbon-based material, the second temperature is from 300 DEG C. to 600 DEG C., and the porosity of the ceramic article may reach 30% to 70%. By this method, the property of the ceramic article (including mechanical strength, porosity, pore shape and size) can be designed according to requirement and controlled for quality assurance.

The invention provides a composite lithium metal negative electrode, a preparation method and a lithium ion battery. The method for preparing a composite lithium metal negative electrode includes: providing an electronically conductive framework material with a porous structure; performing lithium-friendly modification treatment on the electronically conductive framework material; mixing the lithium-friendly electronically conductive framework material with liquid lithium to make the liquid state Lithium is impregnated into the pores of the electronically conductive framework material and subjected to cooling treatment to obtain a composite lithium metal negative electrode, wherein, by controlling the volume of liquid lithium to the ratio of the total volume of pores in the electronically conductive framework material, the composite lithium metal negative electrode The porosity is 20‑98%, and the lithium content is 0.01‑10mg / cm 2 . The method of the present invention can accurately control the porosity and lithium content of the composite lithium metal negative electrode, effectively avoid the formation of dendrites, improve the volume expansion of the lithium metal negative electrode, poor cycle performance, and high safety risks, so that the application of the composite lithium metal Batteries with negative electrodes have high energy density and long-term cycle stability.

The invention relates to a preparation method of a bionic artificial bone with a multistage [micrometer / nanometer] pore structure. The method is characterized by the following steps of: realizing 150-800 mum gradient through pores by selective laser sintering (the diameter of the light spot is micrometer scale); mixing and performing oxygenolysis on a small amount of high polymer microballoons in the sintering process to form 10-100 mum random spherical pores; finally obtaining the bionic artificial bone which has an three-dimensional hierarchical pore structure similar to that of a natural bone by a method of obtaining irregular pores in tens of nanometer surfaces by a corrosion process. In the invention, according to the requirement of an implanting position, the distribution, connectivity and the like of the gradient through pore can be accurately controlled by adjusting sintering process parameters; the shape, size and the like of the spherical pores can be controlled by precisely controlling the furnace temperature curve and high polymer particle properties; the size, quantity and the like of the nanometer pores can be controlled by controlling the corrosion liquid concentration and corrosion time. The preparation method disclosed by the invention has an important significance in creating a microenvironment beneficial to cell adhesion, proliferation and function exertion, improving forming of new bones, and increasing healing of bones.

The invention discloses a method for preparing ZnO linear resistance with adjustable porosity. No additional process is added in the process of preparing ZnO linear resistance, the method is simple and easy to operate, and graphite powder introduced in the process of preparing ZnO linear resistance can effectively exclude. The graphite powder used is non-toxic, low in price, easy to obtain, and the volatilization of organic matter and carbon gasification products in the sintering process are easy to collect and process, without environmental pollution, and without residue after sintering. Without changing the composition of the ZnO linear resistance element and without affecting the performance of the ZnO linear resistance element, the precise control of the porosity of the ZnO linear resistance element can be realized, so as to meet the various needs of heat dissipation, strength and light weight. The prepared ZnO linear resistance element can meet the application requirements of more occasions.

The invention relates to a paint wastewater treatment device. Raw water enters into a regulating tank, and the water in the regulating tank enters a pre-filter through a lift pump to be filtered and then enters a degassing and carbonization linkage device; The activated carbon tail gas treatment device is connected to the membrane module through a vacuum pump; the outlet of the carbonized membrane module is connected to the dosing pool a, and the waste water in the dosing pool a can enter the micro-electrolysis device through the pump a; the outlet of the micro-electrolysis device is connected to the dosing pool a Pool b, the wastewater in the dosing pool b enters the serpentine tube through the pump b for Fenton reaction; the outlet of the serpentine tube is connected to the dosing pool c, and the outlet of the dosing pool c is connected to the coagulation sedimentation tank; the coagulation The clear liquid in the upper part of the sedimentation tank enters the photocatalytic device through the pump c, the water outlet of the photocatalytic device is connected to the intermediate water tank, and the water in the intermediate water tank enters the enhanced filter through the pump d. The invention reduces the COD of paint wastewater, has simple device flow and long service life.

A bone repair porous compound stent based on 3D-Bioplotter printing technology and a preparation method therefor. The stent is formed by compounding a matrix provided with a 3D macroporous structure and a drug carrying microsphere. The preparation method comprises the following steps: printing a stent matrix having a regular 3D macroporous structure by means of 3D-Bioplotter; preparing a drug carrying microsphere compounding hexagonal mesoporous silica (HMS), calcium silicate (CS) powder and PLGA by means of an emulsion solvent volatilization method; finally, fixing the compound microsphere into the matrix by means of low-temperature sintering, so as to obtain the bone repair porous compound stent based on 3D-Bioplotter printing technology.

The invention relates to a paint wastewater treatment process, which includes the following process: the raw water enters the adjustment pool; the water in the adjustment pool enters the pre-filter through the lifting pump and is filtered, and then enters the degassing and carbonization linkage system. The degassing and carbonization linkage system is equipped with Carbonized membrane module; the effluent of the carbonized membrane module passes through the dosing tank a and enters the micro-electrolysis system through pump a to treat high-concentration organic wastewater; The Fenton reaction is carried out in the shaped tube, and the medicine tank b is added to adjust the pH value and hydrogen peroxide content; after the Fenton reaction, the effluent enters the coagulation sedimentation tank for precipitation after the dosing tank c is added; the clear liquid in the upper part of the coagulation sedimentation tank Enter the photocatalytic system through pump c to remove organic matter in the clear liquid; the photocatalytic effluent is collected in an intermediate water tank, and then enters the enhanced filter through pump d to be discharged. The invention reduces the COD value of paint wastewater, has simple technological process and long service life.

The invention relates to a porous conductive ceramics, in particular to a porous conductive MAX phase (Ti3SiC2, Ti3AlC2 or Ti2AlC) ceramics with a through hole structure, and a preparation method and a use thereof. The porosity of the porous ceramics is adjustable within the range of 20-65%, the ceramics comprises a through hole structure, and the openporosity is more than 85%. The preparation method comprises the steps of taking MAX phase ceramic powder as a raw material, molding, carrying out pressureless sintering in an atmosphere furnace, keeping the sintering temperature at 1200-1400 DEGC, and leading the sintering time to be 0.5-3 hours. The MAX phase conductive ceramics with the through hole structure prepared by the pressureless sintering method can be used as a catalyst carrier material for automobile exhaust purification. The invention can solve the problems of liquid phase, a large number of closed pores in the generated hole and the like during the sintering process by optimizing the molding pressure, the sintering temperature and the time precise control of the porosity.

A modified AMIC bio-3D printed active biofilm for cartilage repair, characterized in that: the biofilm uses sodium alginate / gelatin / hyaluronic acid as raw materials to prepare a mixed hydrogel, and the hydrogel is mixed with pre-cartilage Somatic cells and fibronectin, using depositional bio-3D printing technology to construct a porous hydrogel biofilm, and chemically cross-linked to enhance mechanical properties by soaking in calcium chloride. The materials used in the invention are all natural materials, have low immunogenicity, good biocompatibility, wide sources, and have certain mechanical properties to provide good support for cartilage regeneration. As far as the preparation method is concerned, the gaps of 300-500 microns can promote cartilage regeneration, and the excellent porosity structure can also promote the exchange and communication of substances between cells, which is conducive to the adhesion of cytokines or cells, and is beneficial to cells in its environment. Internal growth and proliferation.

The invention relates to the cross-technical field of porous metal and metal-matrix composite materials, in particular to a functional gradient aluminum foam and a preparation method thereof. The gradient aluminum foam of the present invention comprises at least one layer of pure foamed aluminum layer and at least one layer of carbon nanotube reinforced foamed aluminum matrix composite material layer; the porosity of adjacent pure foamed aluminum layers is different; adjacent carbon nanotubes reinforced foamed aluminum matrix composite The material layers differ in porosity and / or in carbon nanotube content. The present invention combines the density gradient with the composition gradient to prepare functionally gradient aluminum foams with simultaneous changes in matrix material and density. The gradient material can be designed according to the service environment of the material, and the advantages of the gradient foam material can be fully utilized, with good absorption. Energy effect; in the case of the same overall porosity, the gradient aluminum foam of the present invention has a higher stress level and higher energy absorption than uniform aluminum foam, thereby increasing its cushioning energy absorption performance.