362results about How to "Control mechanical properties" patented technology

The invention relates to a selective laser melting forming molten bath real-time monitoring device and a monitoring method, and belongs to the technical field of 3D printing additive manufacturing. The selective laser melting forming molten bath real-time monitoring device and the monitoring method can monitor the molten bath temperature, the shape and the area in the SLM forming process in real time, conduct online assessment on the forming precision and the laser power and feed back the result. According to the adopted technical scheme, a melting forming laser system and a pulsed laser are arranged on the top of a forming cavity, a piece of transparent glass is arranged in the center of the top of the forming cavity, a laser lens tube is arranged above the transparent glass, and the pulsed laser is connected with the laser lens tube through an optical fiber. A lifting frame is arranged in the forming cavity, lifting mechanisms are arranged on the two sides of the lifting frame, and cameras are arranged at the bottom of the lifting frame in the mode of different angles. The melting forming laser system, the pulsed laser, the lifting mechanisms and the cameras are connected with a master control system. The selective laser melting forming molten bath real-time monitoring device and the monitoring method are widely used for real-time monitoring of a selective laser melting forming molten bath.

The invention provides a composite enhanced through coupling of flaky and linear thermal conductive materials. The composite is obtained through compounding a porous flaky thermal conductive material, a linear thermal conductive material and a basis material, wherein the thermal conductive materials are at least one selected from graphite, diamond, graphene, carbon nanotubes, graphene coated diamond and carbon nanotube coated diamond; the basis material is a metal or a polymer; and high-thermal conductivity particles can be added in the basis material. According to the invention, the metal based or polymer based composite enhanced through coupling of the porous flaky thermal conductive material and the linear thermal conductive material has relatively high thermal conductivity in the direction parallel to the heat flux direction and the direction vertical to the heat flux direction, the industrial production can be achieved, and the application prospect is wide.

The invention discloses a method for girth welding for double-phase stainless steel bimetal composite tubes. The method comprises the following steps of: firstly, groove processing: the double-phase stainless steel bimetal composite tube consists of a double-phase stainless steel lining tube and a carbon steel base tube, the welding surface of the base tube is processed into a V-shaped groove at an angle of 45-55 degree, and the lining tube is 2-3 mm longer than the base tube; secondly, caulk welding: the connection ports between the base tube and the lining tube are welded through argon tungsten-arc welding, double-phase stainless steel welding wires are adopted, and the welding current is 65-80 A; thirdly, backing welding: the connection ports of lining tube are welded through argon tungsten-arc welding, double-phase stainless steel welding wires are adopted, and the welding current is 60-90 A; fourthly, base tube welding: the connection ports of the base tube are welded through arc welding, and double-phase stainless steel welding wires are adopted. The procedures and the steps are simple, the used welding material is in a small amount, the welding qualification rate is high, the welding defect can be reduced or avoided, and the production efficiency can be greatly improved.

The invention relates to a medical degradable and absorbable Mg-Sr system magnesium alloy implant and a preparation method thereof. The medical implant is made of Mg-Sr system alloy, and the Mg-Sr system alloy comprises the following elements in percentage by weight: 0 to 5 percent of strontium (except for 0 percent), a small amount of trace elements, namely one or more of manganese, zirconium, stannum, rare earth and yttrium and the balance of magnesium, wherein the total content of the trace elements is less than 3 percent. In-vivo and in-vitro experiments prove that the Mg-Sr system magnesium alloy implant does not have toxicity, has high histocompatibility, and is a reliable biological medical implant material.

The invention relates to a microbolometer, which comprises a microbridge structure, wherein a thermosensitive resistance material and an infrared absorption material layer in the microbridge structure are of a carbon nanometer tube-amorphous silicon composite film, the carbon nano tube-amorphous silicon composite film is formed by compounding an one-dimension carbon nano-tube and a two-dimensional amorphous silicon film, and the microbridge structure is of a three-layer sandwich structure; the most bottom layer is of a amorphous silicon nitride film which is used as a supporting and insulation material of the microbridge; the intermediate layer is of one layer or multiple layers of carbon nano-tube-amorphous composite film, the stress is opposite to the nature of the bottom layer silicon nitride film, and the carbon nano-tube-amorphous composite film is used as the thermosensitive layer and the infrared absorption layer of the microbolometer; and the surface layer is of an amorphous silicon nitride film, the stress of the amorphous silicon nitride film is opposite to the nature of the intermediate carbon nano-tube-amorphous composite film, and the amorphous silicon nitride film is used as a passivation layer of the inforared sensing film and a control layer of the stress. The microbolometer and the preparation method can overcome the weaknesses of the prior art, improves the working performance of the part, reduces the cost of the raw material and are applicable to the industrialized mass production.

The invention discloses a sodium alginate-chitosan double-layer edible membrane as well as a preparation method and an application thereof. The sodium alginate-chitosan double-layer edible membrane isprepared from a sodium alginate membrane and a chitosan membrane through cross-linking compounding. The sodium alginate-chitosan double-layer edible membrane is prepared from a safe and non-toxic material, wide in raw material source, low in production cost and good in membrane forming property, the eating security of an edible inner packaging membrane is improved, through synergetic promotion ofthe components, the air permeability of the membrane is remarkably degraded, the oxygen permeation rate of the membrane is remarkably reduced, the tension property and the transparency of the membrane are remarkably improved, and the membrane is easy to degrade; due to addition of a natural antibacterial agent, microorganism pollution can be very well prevented; the thickness of the membrane canbe controlled by changing the proportioning of the sodium alginate to the chitosan, and then the mechanical properties, the dissolution degree and the antibacterial agent release speed of the membraneare controlled; and the membrane is simple in preparation step, and by adopting the preservative membrane made from the membrane disclosed by the invention, moisture loss and microorganism pollutionin the transportation, storage and processing process of fruits and vegetables can be reduced.

A method of enhancing 3D image information density, comprising providing a confocal fluorescent microscope and a rotational stage. 3D image samples at different angles are collected. A deconvolution process of the 3D image samples by a processing unit is performed. A registration process of the deconvoluted 3D image samples by the processing unit is performed. An interpolation process of the registered 3D image samples by the processing unit is performed to output a 3D image in high resolution.

The invention relates to a preparation method for a finely structured POSS hybridization low dielectric material. The method takes a POSS monomer containing an active group and dual functional group organic micromolecules capable of having a click chemical reaction as the precursor of the finely structured hybridization low dielectric material, and makes use of an environmentally friendly click chemical synthesis method to connect the finely structured POSS molecules and the organic micromolecules onto the low dielectric material structure orderly. Through changing the composition, structure and performance of the organic molecular chain connected with POSS, the method realizes the adjustment and control of the structure, porosity, thermal property, mechanical property and dielectric constant of the finely structured hybridization low dielectric material.

The invention provides a superhigh-thermal-conductivity continuous diamond skeleton reinforced composite material and a preparation method. The composite material is composed of a continuous diamond reinforced body and a base material. The continuous diamond reinforced body is prepared by depositing diamond films or diamond compound films on diamond particle preforms through a CVD method. The diamond compound films are graphene-wrapped diamond films or carbon-nanotube-wrapped diamond films. The base material is made of metal or polymer. Diamond powder is prepared into the performs, then the diamond films deposit on the surfaces of the performs through the CVD method, the diamond films are formed at the contact positions of adjacent diamond particles, and accordingly continuous heat conducting channels are formed between the isolated diamond particles. The deposited diamond films can serve as heat conducting bridges between the diamond particles, so that the dispersed diamond particles form a connection structure, accordingly high heat conductivity of diamond is fully used by the composite material, and the heat conductivity of the composite material is greatly improved.

The invention discloses a cartilage tissue engineering scaffold material and a preparation method thereof. The scaffold material is a three-dimensional porous structure formed by using sodium alginate and chitosan as a base material, and enabling the carboxyl on a side chain of the sodium alginate activated by activation cross-linking agent to react with amino group of chitosan, wherein molar ratio of the sodium alginate carboxyl to the chitosan amino group is (3:7)-(7:3), and the final product only contains two components, sodium alginate and chitosan. The three-dimensional porous scaffold provided by the invention has good biocompatibility, and is suitable for the cartilage tissue engineering.

A film-forming composition and a polymeric film or coating comprising hemicellulose, having a molecular weight of less than 50 000 g/mol, and at least one component selected from the group consisting of plasticizers, cellulose and a synthetic oligomer or polymer is disclosed. The use of said film or coating as an oxygen barrier is also disclosed. Further, a method for the manufacture of said polymeric film or coating is disclosed, as well as a method for improving the film-forming properties of hemicellulose having a molecular weight of less than 50 000 g/mol.

The present invention relates to material forming technology, and is especially mold and method for liquid state formation of aluminum hub disc for special vehicle. The mold includes a lower mold, a female mold casing, an upper mold, an inner male mold and an outer male mold. The corresponding forming process includes the steps of: making wear resistant reinforcing body, setting the reinforcing body inside the mold, pouring aluminum alloy liquid, and extruding. The mold has simple structure, the forming process is simple and high in efficiency, and the product has high performance.

The invention belongs to the technical field of cold rolled steel and discloses zinc-plated double-phase steel and a production method of the zinc-plated double-phase steel. The zinc-plated double-phase steel comprises, by weight percentage, 0.085%-0.115% of C, 0.15%-0.24% of Si, 1.45%-1.55% of Mn, not larger than 0.015% of P, not larger than 0.005% of S, 0.025%-0.065% of Alt, 0.14%-0.24% of Cr, 0.24%-0.29% of Mo, not larger than 0.006% of N and the balance Fe and other inevitable impurities. The production method includes the steps of KR desulfuration, converter steelmaking, LF+RH refining treatment, RH calcium treatment, continuous steel casing, billet heating, rough rolling, finish rolling, laminar cooling and winding; unwinding, acid pickling, cold continuous rolling and winding; and unwinding, cleaning, annealing, zinc plating, finishing and winding. Through composition design and process control, the zinc-plated double-phase steel is suitable for annealing production lines having the rapid cooling segment or not.

The invention provides a method for preparing a conductive composite nanofiber nervous tissue engineering scaffold based on graphene. The method includes the following steps: a step 1, dissolving tussur silk fibroin and poly (lactic acid)-poly caprolactone in a solvent with stirring till complete dissolution of the tussur silk fibroin and the poly (lactic acid)-poly caprolactone so as to acquiring a spinning solution; a step 2, performing electrostatic spinning on the spinning solution obtained from the step 1 so as to acquire a nanofiber membrane, performing steam fumigation treatment by using ethyl alcohol, and performing drying so as to acquire tussur silk fibroin/ poly (lactic acid)-poly caprolactone composite nanofibers; and a step 3, dipping the tussur silk fibroin/ poly (lactic acid)-poly caprolactone composite nanofiber scaffold material obtained from the step 2 in a graphene oxide dispersion liquid, taking out the tussur silk fibroin/ poly (lactic acid)-poly caprolactone composite nanofiber scaffold material, cleaning the tussur silk fibroin/ poly (lactic acid)-poly caprolactone composite nanofiber scaffold material, soaking the tussur silk fibroin/ poly (lactic acid)-poly caprolactone composite nanofiber scaffold material in an ascorbic acid solution, taking out the tussur silk fibroin/ poly (lactic acid)-poly caprolactone composite nanofiber scaffold material, and cleaning the tussur silk fibroin/ poly (lactic acid)-poly caprolactone composite nanofiber scaffold material so as to acquiring the conductive composite nanofiber nervous tissue engineering scaffold based on the graphene. The method is simple to operate, is excellent in repeatability, and can provide a new thought for nerve defect repairing.

The invention belongs to the technical field of flexible conductive fibers for wearable electronic devices and preparation thereof, specifically relates to a conductive coaxial nanofiber with a sheath-core structure of an aramid fiber or a polyamide fiber coating a reduced graphene oxide and a preparation method thereof, and provides a preparation method of a conductive fiber with a sheath-core structure. The preparation method of the conductive fiber with the sheath-core structure comprises the steps that (1), a core layer spinning solution is prepared; (2) a sheath layer spinning solution isprepared; (3) a coaxial fiber is prepared; and (4), high-temperature thermal reduction is conducted, specifically, the coaxial fiber obtained in the step (3) is subjected to the high-temperature thermal reduction to obtain a conductive coaxial nanofiber, that is, the conductive fiber with the sheath-core structure. According to the preparation method of the conductive fiber with the sheath-core structure, graphene oxide is used as the core layer material, and the high temperature resistant wet spinning polymer is used as the sheath layer material, thus reduction of the core layer graphene oxide through the high temperature thermal reduction can be realized, so that the obtained fiber has flexibility and also has the excellent electrical and mechanical properties.

The biodegradable magnesium alloy blood vessel rack consists of magnesium in 60-95 wt% and other metals, including RE, for the rest. Metal magnesium as the basic material has excellent tissue compatibility and blood compatibility, and the added other metal, including RE, elements raise and improve the comprehensive performance, especially mechanical strength, plasticity, degradability and biocompatibility. The magnesium alloy blood vessel rack has tensile strength of 200-300 MPa, elastic module of 10-50 GPa, elongation at break of 2-10%and degrading half life of 6-18 weeks. Most of the degraded metal ions are drained through renal tubules while small part being utilized by human body.

The invention relates to a regenerative implant of a cruciate ligament and a preparation method and application thereof. A surgical suture-shaped structure made of a degradable high molecule polymerization material is used as an initial mechanical support structure; a membrane-shaped structure made of a composite electrostatic spinning timbering material is used as a core structure for tissue remodeling and regeneration to be tightly wrapped in a winding mode on the initial mechanical support structure so as to form ligament regeneration elements; the multiple ligament regeneration elements form a ligament regeneration element set which is the regenerative implant of the ligament. The results of a goat animal experiment confirms that the implant is completely degraded within 52 weeks after being implanted to an organism, is induced to form an autogenous ligament tissue in the cavity of a knee joint, and induces the bone tunnel interface of a tibia and a femur to form tendon-bone healing; the maximum pulling force of the regenerated ligament is 20-60% that of a normal ligament tissue within 12 months after the implant is implanted to the organism.

The invention discloses a preparation method of a urea slow-release film coating agent of an acrylic ester mixed polymer, which comprises the following steps: the preparation of the acrylic ester mixed polymer, the preparation of water-soluble polymer water solution and the preparation of the slow-release film coating agent of the acrylic ester mixed polymer. The preparation method takes water as a polymerization medium, polymer emulsion prepared by segmentation emulsion polymerization effectively controls water resistance and mechanical properties of slow-release materials, and the polymer emulsion is added with the water-soluble polymer material to improve the film forming capacity of the emulsion and the stability of the film material. The method has the advantages that no organic solvent is adopted during the production process, no waste gas and waste liquid is produced, and the slow-release film coating material obtained has good film forming effect, excellent slow-release function and good water solubility, therefore, the slow-release film coating agent is an ideal environment-friendly film coating material.