872 results about "Porous titanium" patented technology

The invention discloses a porous titanium dioxide/graphene composite material and a preparation method thereof. The preparation method comprises the steps of: adding aniline and graphene into a surfactant-containing protonic acid solution according to a certain ratio; preparing a nanometer polyaniline/graphene composite material through an in-situ polymerization method; preparing titanium dioxide sol by using a sol-gel method; adding 0.05-0.20g of nanometer polyaniline/graphene composite material into 50mL of sol, uniformly mixing; standing and aging the sol for 3-5 days; drying in a drying oven at the temperature of 60-120 DEG C; milling; calcining the obtained composite for 30 minutes -2 hours at the temperature of 200-550 DEG C; and removing the polyaniline, thereby obtaining the porous titanium dioxide/graphene composite material. According to the invention, the porous titanium dioxide/graphene is prepared by utilizing the nanometer polyaniline and the titanium dioxide is deposited on the graphene, so that the contact area of the titanium dioxide and pollutants is increased, the separating efficiency of photo-generated electrons and holes is improved and the photocatalytic efficiency is improved.

The invention relates to a method for preparing an ordered porous anodic titanium dioxide nanotube array. The method can prepare an ultra-large area defect-free titanium dioxide nanotube array film, the surface layer is the porous shape like an anodic aluminum oxide template, and the lower layer is a nanotube ordered array, thereby overcoming the common problems of easy lodging and aggregation of tubes in the prior art of preparing the anodic titanium dioxide nanotube array and simultaneously solving the problems that the prepared nanotube array film has more surface defect corrosion pits and the sediment blocks tube mouths. The nanotube array can realize the controllable growth by controlling the preparation conditions and the process and obtain the ordered array films with different tube diameters, different wall thicknesses and different tube lengths. The diameter range of the nanotubes is 20-200nm, the wall thickness range is 5-30nm, and the length range of the titanium dioxide tubes is 100nm-1mm. The invention particularly relates to a technology which can effectively and completely strip the titanium dioxide array film, effectively strip a titanium substrate from the TiO2 nanotube array and obtain the different sizes of porous nanotube array self-support films.

The invention discloses a perovskite solar cell. The perovskite solar cell is characterized by sequentially comprising a conductive glass layer, a compact titanium dioxide film, a porous titanium dioxide film, a methylamine lead iodine polycrystalline film, a hole-transport material layer and an evaporation silver electrode layer. Interface modification is carried out on the methylamine lead iodine polycrystalline film through long-chain alkyl silane coupling agents, and the number of carbon atoms of the long-chain alkyl silane coupling agents is larger than six and smaller than sixteen. The invention further discloses a manufacturing method of the perovskite solar cell. Compared with the prior art, the perovskite solar cell and the manufacturing method have the advantages that as interface modification is carried out through the long-chain alkyl silane coupling agents, the recombination of electrons in the cell can be suppressed, and the stability of the cell in the wet environment can be improved.

The invention concerns monolithic foam sleeves that comprises titanium or titanium alloy foam having a porosity of 50 to 85% and possess a proximal end, a distal end, an interior wall that defines an interior channel and extends from the proximal end to the distal end; and a terraced outer surface that tapers such that said sleeve is widest at the distal end and most narrow at the proximal end.

The invention relates to an organic wastewater treatment film reactor utilizing solar energy photo-assisted electro-catalysis, which comprises a storage tank of water to be processed, a flow controllable constant flow pump, a photoelectric chemical reactor, a clear water storage tank and a solar battery component, wherein a photo anode and a cathode are correspondingly arranged in the reactor; the photo anode takes a porous metal membrane as a base body, and a TiO2 nano tube or a TiO2 mesoporous membrane is formed on the surface of a porous titanium membrane (net) by an electrochemical anisotropic etching technology; a porous channel film is used as the base body; a metal oxide coating electrode with high electrochemical catalytic activity and high electrical conductivity is prepared by a dipping film-forming method, simultaneously, by doping and modifying operations, the electrode material has photo catalytic activity and the reaction efficiency is improved. The reactor integrates electrochemistry, photocatalysis and film separation technologies; the three technologies are coupled to enhance a synergistic effect; the wastewater treatment efficiency can be improved; a solar component is adopted as a power supply; the clean solar energy is utilized to the maximal degree, and the organic wastewater treatment film reactor has social benefits of reducing environment load and economic benefits of reducing cost.

The invention discloses a preparation method of medical porous titanium and titanium alloy, which comprises the following steps: proportionally preparing titanium powder, alloy element powder and pore forming agent powder according to needs; carrying out ball milling, mixing and mechanical pressing by a powder metallurgy blank making technique to obtain a blank; putting the blank in a thermal insulation barrel, and putting the thermal insulation barrel into a microwave sintering furnace; and after vacuumizing the furnace chamber to a vacuum degree of 0.1Pa, charging argon with the purity of 99.999% to form cyclic protection, controlling the output power of the microwave sintering furnace at 0.5-3kW, heating to the sintering temperature of 800-1200 DEG C at the heating rate of 5-40 DEG C/minute, keeping the temperature for 5-30 minutes, shutting down the microwave source, and carrying out furnace cooling to obtain the medical porous titanium and titanium alloy. The invention has the advantages of simple preparation method, short sintering period, high efficiency, low sintering temperature and low energy consumption; and the sintered porous titanium and titanium alloy have excellent mechanical properties, and can be used as alternate repair material for bones, joints, artificial radix dentis and other hard tissues.

The invention provides a preparation method of an S/TiO2 composite material for an anode of a sodium-sulfur battery. The preparation method comprises the following steps: dissolving butyl titanate, a template agent and a hydrolysis inhibitor into absolute ethyl alcohol; adding a mixed solution of de-ionized water and the absolute ethyl alcohol to form semi-transparent sol; transferring the sol into a high-pressure reaction kettle to react; calcining a solid product in air to remove the template agent to obtain meso-porous titanium dioxide; dispersing the meso-porous titanium dioxide into a sodium thiosulfate solution dissolved with a surfactant; adding hydrochloric acid to react; washing the solid product by a lot of the de-ionized water and drying; and eating under the protection of an inert atmosphere to obtain the S/TiO2 composite material. The meso-porous titanium dioxide prepared by the preparation method is large in specific surface area, high in porosity and strong in adsorption capability; the electrical conductivity of sulfur can be improved and a lot of nano sulfur and polysulfide can be contained; the polysulfide can be effectively prevented from being dissolved and diffused in electrolyte, and the utilization rate of the sulfur is improved; meanwhile, the structure of the meso-porous titanium dioxide is stable and a pore channel cannot be easily damaged, so as to have buffering effects on volume expansion and retraction in a charging/discharging process of a sulfur electrode.

The present invention discloses composite cold spraying and vacuum sintering process for preparing porous titanium coating. Mixed titanium-magnesium powder is first sprayed onto the roughened titanium or titanium alloy substrate to form composite titanium-magnesium coating, which is then sintered at high vacuum and high temperature to obtain porous titanium coating. Thus produced porous titanium coating has no oxide, thickness greater than 0.5 mm, opened and communicated pore structure, pores of 30-200 microns, porosity of 30-65 %, and metallurgical combination with the substrate with combination strength higher than 60MPa and elastic modulus adjustable in 30-50 GPa. The present invention is suitable for making bearing hard tissue implant, such as artificial joint, artificial bone, artificial tooth root, etc. with improved long term stability.

The invention discloses a preparation method of a bio-ceramic coating titanium-wire sintering porous titanium artificial bone, belonging to the biomedical engineering field. In the invention, a three-dimensional weaving method is utilized, a titanium metal fiber wire is constructed into a controllable structure model, a random structure model and a bionic structure model which can stimulate the bone trabecula and principal stress line of a human bone, and then is prepared into the porous titanium artificial bone through prepressing molding and vacuum sintering, after that, a sol-gel method is utilized to manufacture a gradient coating or a complex coating on the surface of the porous titanium artificial bone, so that the gradient coating transiting from titanium dioxide to bio-ceramics or the bio-ceramics-titanium dioxide complex coating is formed on the surface of the porous titanium artificial bone to obtain the bio-ceramic coating titanium-wire sintering porous titanium artificial bone. The preparation method not only can protect the titanium metal skeleton and prevent titanium ions from dissociating to enter a human body, but also can ensure that the titanium metal skeleton the surface of which is coated with the bio-ceramics has the biological characteristics, therefore, the bio-ceramic coating titanium-wire sintering porous titanium artificial bone can be applied to repairing clinical segmental defect of long bones.

The invention discloses a preparation method of a boron-doped diamond (BDD) film electrode taking porous titanium as a matrix. The preparation method is characterized in that the titanium matrix is a porous titanium material with the porosity of 20-50%, hot filament chemical vapor deposition equipment is adopted, and a porous titanium base BDD electrode is prepared through chemical vapor deposition by using a second-order boron concentration control mode. By adopting the method, the generation capacity of TiC is controlled by adjusting boron source concentrations of different stages during chemical vapor deposition, namely the formation of TiC is inhibited by using high boron doping at the initial stage to improve the bonding force between a base and a film, and the boron source concentration is reduced in the later period of reaction to perform low boron doping. The porous titanium base BDD electrode prepared by the method disclosed by the invention is uniform and compact in diamond grain, and the porous titanium matrix is completely covered by a diamond film, so that the electrode has good stability and a relatively wide potential window.

The invention discloses a preparation method of biomedical porous titanium, belonging to the technical field of preparation of biomedical materials. The preparation method comprises the following steps: proportioning Ti metal powder and NH4HCO3 pore-forming agent powder according to required porosity and then mixing the powder to obtain mixed powder, mechanically pressing the mixed powder into blocky pressed blanks, then putting the blocky pressed blanks into a spark plasma sintering furnace, vacuumizing a system to 2-6Pa and then sintering, continuously vacuumizing in the sintering process so that NH4HCO3 is cooled to the room temperature along with the furnace after being completely decomposed and volatilized and carrying out mold release, thus obtaining the biomedical porous titanium material, wherein the heating rate is 50-100 DEG C/min, the sintering temperature is 1000-1200 DEG C, and the sintering and insulating time is 5-10min. The biomedical porous titanium material prepared by utilizing the method has the advantages of pure components without pore-forming agent residues, controllable pore parameters (the porosity is 30-70% and the pore dimension is 300-1000mu m), low elasticity modulus (2-20GPa), proper strength (100-287MPa) and the like, and can be applied as a good artificial bone tissue repair or replacement material.

The invention provides a preparation method of a porous titanium with controllable porosity, comprising the following steps: Ti powder and 1 wt.%-4 wt.% of binder are well mixed; urea particles are used as a pore forming agent and added into the mixture, the volume fraction between the pore forming agent and the mixture is 30-80 percent: 70-20 percent, and the mixture is mixed fully and evenly; and then the obtained mixture is one-direction pressed into blanks under the pressure of 100MPa to 250MPa; the obtained green compact is heated in a vacuum furnace with the vacuum degree kept between 10<-2> to 10<-3>Pa, thus obtaining porous metal members. The porosity can be determined by the quantity of added urea in the invention, and the size and shape of the pores can be determined according to the size (200Mum to 2mm) and shape of urea particles, thus realizing the target of controllable porosity, pore size and pore shape; the preparation method of the invention also has the advantages of simple technique, low equipment requirement, convenient operation and low cost.

The invention provides a method for preparing biomedical a porous titanium and titanium alloy material, belongs to the technical field of the preparation of biomedical materials, and relates to a method for preparing porous materials, in particular the method for preparing the porous titanium and titanium alloy material. The method for preparing the porous titanium and titanium alloy material comprises the following steps of: mixing the mixture of Ti powder and 1 to 40 mass percent of Mg powder serving as a pore-forming agent in a mixer for certain time; filling the mixture in a mould; forming a set shape under certain pressure; putting green bodies into a high temperature furnace; introducing argon; heating to the temperature of between 650 and 750 DEG C; keeping the temperature for 1 to 2 hours; continuously heating the blank to the temperature of between 1,150 and 1,250 DEG C; and keeping the temperature for 3 to 7 hours and cooling to prepare the porous titanium and titanium alloy material. The method has the advantages of simple process, convenient operation, no residue or pollution of the pore-forming agent and high pore-forming quality.

The present invention relates to a nano crystal porous titanium dioxide film and its preparation method. Said film is a film with TiOn structure, in which n is 1.5-2.5, it is a polycrystalline crystal structure, its grain size is 10-500nm and its pore size is 10-500nm. Its preparation method includes the following steps: (1), cleaning matrix material by using ultrasonic wave, drying and placing the cleaned and dried matrix material in the lower portion of plasma reactor, introducing carrier gas inert gas; (2), introducing mixed gas of oxygen gas and titanium-containing gas carried by carrier gas, applying high-votage etectricity, regulating biasing electrode and pulse bias voltage, forming active granules containing titanium, under the action of biased polarization and acceleration forming wire-mesh structure, at the same time making the active granules containing titanium be carried onto matrix material surface and deposited; and (3), after the reaction deposition taking out matrix material, on the surface of matrix material can obtain the nano crystal porous TiO2 film.

An electrocatalytic porous titanium filter membrane with a micro nano structure and a preparation method thereof are disclosed, the electrocatalytic porous titanium filter membrane comprises a porous titanium film matrix, a TiO2 middle layer with the micro nano structure and an electrocatalytic active layer loaded on the TiO2 middle layer, the TiO2 middle layer with the micro nano structure is TiO2 nano flower, nanowire, nanorod or nanotube aggregates growing in situ on the porous titanium film matrix, and the electrocatalytic active layer is PbO2, SnO2, RuO2, IrO2, Sb2O5, Bi2O3 and other transition metal oxides or a composite comprising the various metal oxides. The method comprises three main steps: pretreatment of the porous titanium matrix, construction of the middle layer with the micro nano structure and loading of the active layer. The electrocatalytic porous titanium filter membrane has excellent mass transfer performance, high electrocatalytic activity, high pollutant removal efficiency, low energy consumption, and the like, thus having a good application prospect in the field of organic wastewater treatment.

The invention discloses a method for coating and modifying a lithium ion battery positive electrode material, and belongs to the technical field of a new energy lithium battery positive electrode material. The method comprises the steps of uniformly mixing the positive electrode material in a solution of a template agent, an organic solvent, a ligand and an organic titanium salt; transferring the uniformly-mixed solution to a high-pressure reaction kettle, and automatically assembling the organic metal salt and the ligand into a metal organic framework material (MOFs) under high temperature and high pressure and under an effect of the template agent, wherein the MOFs is uniformly coated on a surface of the positive electrode material; and performing calcination on the obtained product after filtering, drying and grinding to obtain the final lithium ion battery positive electrode material coated with porous titanium dioxide. With the lithium ion battery positive electrode material prepared by the method, the high- and low-temperature performance of the battery is improved; and the titanium dioxide with a stable structure is coated on the surface of the positive electrode material, and the cycle stability of the positive electrode material can be remarkably improved.

The invention provides a preparation method of a titanium carbide-based cermet powder material for thermal spraying, which belongs to the field of powder materials for thermal spraying. The method comprises the following steps of: firstly, weighting titanium powder, graphite powder/soot carbon, and other metal components in a proportion to prepare raw material powder; putting the raw material powder into a ball mill pot for ball milling, briquetting the mixture to form a block after the mixing is finished, placing in a self-propagating high-temperature synthesis reactor, igniting the block after the air in the reactor is removed so that the whole block is ignited to undergo a self-propagating reaction; starting a mechanical pump to vacuumize after the reaction is finished, and cooling reaction products to room temperature with the reactor so as to obtain a loose porous titanium carbide-based cermet block; and finally, after the cermet block is taken out, removing contaminants on the surface of the cermet block, and then crushing and screening residual products to obtain titanium carbide-based cermet powder for thermal spraying in different grain sizes. The preparation method in the invention has the characteristics of short synthesis time, energy saving, environmental protection, low price, and the like, and is suitable for industrial production.

The continuous circular flow-type optoelectric catalytic fixed bed reactor has structure including casing, microporous titanium plate cathode, porous titanium ring anode, double-layer U-shaped quartz tube, UV lamp inside the U-tube as light source, optoelectric catalytic reaction chamber formed between the cathode and the anode, fixed bed 3D particle electrode set inside the reaction chamber and formed via painting nano TiO2 onto SiO2 particle, and continuous circulating unit comprising liquid storage and pump connected between the liquid inlet and liquid outlet of the reaction chamber. The present invention also provides the method and technological conditions of treating organic sewage with the reactor. Inside the reactor, voltage higher than the oxidation potential of the pollutant is applied to raise the photocatalytic and eletrocatalytic oxidation efficiency.

The invention discloses a preparation method and application of bacteriostatic bio-active ceramic membrane for a porous titanium or titanium alloy surface of a lattice structure and belongs to the technical field of metal surface treatment. The preparation method of the bacteriostatic bio-active ceramic membrane for the porous titanium or titanium alloy surface of the lattice structure comprises the steps of chemical polishing, preparation of a prefabricated oxide film at a direct-current voltage and preparation of the bacteriostatic bio-active ceramic membrane at a bidirectional square-wave pulse voltage. Chemical polishing is conducted through a chemical acid pickling method. Preparation of the prefabricated oxide film is conducted through a low-voltage direct-current anodic oxidation method. Preparation of the bacteriostatic bio-active functional ceramic layer is prepared through a micro-arc oxidation preparation method. The ceramic layer obtained by the adoption of the preparation method is firmly combined with a matrix, the surface of the ceramic layer is provided with a micron-level microcellular structure, and the ceramic layer can greatly improve the bacteriostatic performance and biological activity of the porous titanium or titanium alloy surface. When an interbody fusion cage for the orthopedics field and an implant for the dentistry field are manufactured based on the preparation method of the bacteriostatic bio-active ceramic membrane for the porous titanium or titanium alloy surface of the lattice structure, the synosteosis time of the implant is shortened, and the bacteriostatic performance of the implant is improved.

The invention belongs to the technical field of laser-Raman spectrum detection appliances and Raman spectrum analysis and detection, and in particular relates to a recyclable surface-enhanced Raman-spectrum active substrate with low cost and good reproducibility, and a preparation method thereof. The substrate is characterized in that a porous titanium dioxide film is loaded on the surface of a carrier base sheet through a dipping and lifting method, and then gold nanoparticles grow on the surface of the titanium dioxide film. The composite substrate has an outstanding surface enhanced effect; and chemical compound molecules absorbed on the surface of gold in a previous Raman experiment can be effectively removed through ultraviolet irradiation, and thus the substrate can be recycled.