120results about How to "High fracture toughness" patented technology

Implantable medical devices fabricated from polymer/bioceramic composites and polymer blend/bioceramic composites are disclosed.

A sandwich of impact resistant material comprising: a first tile comprising a plurality of nano-particles bonded together, wherein the nano-structure of the nano-particles is present in the first tile and the first tile comprises a hardness value; a second tile comprising a plurality of nano-particles bonded together, wherein the nano-structure of the nano-particles is present in the second tile and the second tile comprises a hardness value; and a third tile comprising a plurality of nano-particles bonded together, wherein the nano-structure of the nano-particles is present in the third tile and the third tile comprises a hardness value, wherein the second tile is coupled in between the first tile and the third tile, and the second tile comprises a hardness value greater than the first tile and the second tile.

The invention relates to a Ti alloy new material with high performance. The alloy has the chemical components by weight percent: 3-7 percent of Al, 1-6 percent of Mo, 0.5-6 percent of V, 1-4 percent of Sn, 1-4 percent of Zr, 0.5-3 percent of Cr, 0.5-3 percent of Nb, 0.01-0.3 percent of Si, and the balance of Ti. The high performance Ti alloy has favorable comprehensive performance, is in the leadin the worldwide and has the breakthrough points that the strength and the plasticity are kept at the highest level, the fracture toughness of the Ti alloy are greatly enhanced, the use performance ofTi alloy parts is improved, and the comprehensive performance of planes of the country is further improved.

The invention relates to a repeated solid solution aging thermal treatment process of titanium alloy. The process includes the steps that a titanium alloy forge is subjected to heat preservation at the temperature T for t minutes, wherein T is larger than or equal to Tbeta-15 DEG C but smaller than or equal to Tbeta+15 DEG C, t is equal to eta*delta max, delta max is the maximum section thickness of the forge and is shown in millimeters, and eta is the heating coefficient and ranges from 0.2 min/mm to 0.8 min/mm; then the forge is discharged out of a furnace to be air-cooled or wind-cooled or water-cooled to be at the room temperature, then the cooled forge is subjected to heat preservation at the temperature of T for t minutes, wherein T is larger than or equal to Tbeta-25 DEG C but smaller than or equal to Tbeta-50 DEG C, the computational formula of t is as above, namely t=eta*delta max, and the heating coefficient eta ranges from 0.3 min/mm to 1.2 min/mm; then the forge is discharged out of the furnace to be air-cooled or wind-cooled or water-cooled to be at the room temperature, the cooled forge is subjected to heat preservation at the temperature T ranging from 540 DEG C to 600 DEG C, and the heat preservation time t ranges from 0.5 hour to 2 hours; the forge is discharged out of the furnace to be air-cooled to be at the room temperature, the cooled forge is subjected to heat preservation at the temperature T ranging from 400 DEG C to 540 DEG C, and the heat preservation time t ranges from 4 hour to 24 hours; and then the forge is discharged out of the furnace to be air-cooled to be at the room temperature. The repeated solid solution aging thermal treatment process of the titanium alloy is suitable for thermal treatment of near-beta type, metastable beta type and steady beta type ultrahigh-toughness titanium alloy so as to obtain required microscopic structures with high overall performance and multi-scale precipitated phases mixed.

A graphene composite B4C superhard material preparation method is characterized by comprising the following steps: graphene oxide with the sheet diameter greater than 1mum and the layer number not more than five is mixed with B4C powder with the particle size not more than 3mum, the graphene oxide volume fraction is 0.3% -5%, water with the mass of 20-40 times of the mass of the B4C are added for ultrasonic treatment for 10-30min to obtain a graphene oxide / B4C mixture liquid, the graphene oxide / B4C mixture liquid is stirred for 2h more for more uniform mixing, and finally the graphene oxide / B4C mixture liquid is stirred and dried at a drying temperature below 100 DEG C at atmospheric pressure to obtain mixed powder; the mixed powder is pre-pressed into an initial blank in a molding apparatus; the initial blank is put into a high temperature and high pressure apparatus for high pressure sintering to obtain a graphene composite B4C superhard material, wherein the sintering temperature 1300-1600 DEG C, the sintering pressure is greater than 3GPa, and the sintering time is greater than 10min. The superhard material is harder than 19GPa, the fracture toughness reaches 8.76MPa. m1 / 2, and the fracture toughness of the graphene composite B4C superhard material is improved by more than 1 times compared with that of a pure B4C material.

A dense, hard body having good fracture toughness, hardness and a high capacity to absorb impacts which is also useful as lightweight armor. The body is an eutectic of either (a) two carbides selected from boron carbide (B₄C), silicon carbide (SiC), titanium carbide (TiC), tantalum carbide (TaC), tungsten carbide (WC), zirconium carbide (ZrC) and hafnium carbide (HfC); or (b) one of the above carbides and at least one boride of an element of group IVa, Va or VIa of the Periodic Table. The molten eutectic, e.g. a ternary composition of B₄C, SiC and TiB₂, may be generally directionally cooled so its lamellar microstructure is oriented relative to a large surface of the body.

Ceramic filler compositions of customized shapes (FIGS. 1-30) according to the present invention, includes ceramic and glass-ceramic particles having a customized shape which provides mechanical locking within a resin matrix giving significantly improved fracture toughness performance for a resin/glass or ceramic composite system. The material has particular application as a tooth filling material with significantly improved wear resistance. The wide range of unique-shaped filler particles are produced using wet chemistry methods according to the invention of preparing the ceramic particles for use in a resin matrix composite material. Such composite materials have a very wide application, especially as a dental composite filling material for restoring a tooth.

Pre-impregnated composite material (prepreg) that can be cured/molded to form aerospace composite parts. The prepreg includes carbon reinforcing fibers and an uncured resin matrix. The resin matrix includes an epoxy component that is a combination of a hydrocarbon epoxy novolac resin and a trifunctional epoxy resin and optionally a tetrafunctional epoxy resin. The resin matrix includes polyethersulfone as a toughening agent and a thermoplastic particle component.

A cast insulation resin for an electric apparatus having an improved fracture toughness is provided. The cast insulation resin for an electric apparatus is a cast insulation resin used in an electric apparatus, comprising at least either a polar fine elastomer particle or a liquid elastomer having a polar molecule dispersed in an epoxy resin, and a filler formed of at least either an inorganic compound or an inorganic compound having a modified surface thereon with an organic compound.

A high-hardness Ti(C, N)-based metal-ceramic cutter composite is characterized by comprising Ti, TiB2, WC, C, Ni and Mo, wherein the composite is a Ti(C, N)-TiB2-WC metal-ceramic cutter material or a Ti(C, N)-TiB2-(W, Ti)C metal-ceramic cutter material; Ti is Ti (C5, N5), the atomic ratio of C to N is 5:5, the average particle size of Ti is 1.5 microns, and the purity is 99.9%; powder TiB2 is a reinforcement phase, the average particle size is 2 microns, and the purity is 99%; the average particle size of WC is 2 microns, the purity of WC is 99.6%, C is (W0.7, Ti0.3)C, the average particle size of C is 1.5 microns, the purity of C is 99%, and the mass fraction of WC and C is 15%; Ni is nanometer Ni, the average particle size of Ni is 0.05 micron, and the purity of the Ni is 99.9%; Mo is nanometer Mo, the average purity is 0.06 micron, and the purity is 99%. The high-hardness Ti(C, N)-based metal-ceramic cutter composite improves the hardness and the bending strength, at the high temperature, of the Ti(C, N)-based metal-ceramic cutter, improves the mechanical properties of the cutter, saves noble rare metals such as Co, Ta and W, facilitates to improve national resource guarantee and pushes upgrading and updating of hard alloy materials in China.

A ceramic heater having a substrate and a heat-generating element. The substrate is formed from an electrically insulating ceramic and extends rearward from the forward end of the ceramic heater in the direction of the axis. The heat-generating element has a heat-generating portion formed from an electrically conductive ceramic which contains silicon nitride and an electrically conductive material, disposed in a forward end portion of the substrate, and having a shape resembling the letter U as viewed along the direction of the axis. The heat-generating portion has a fracture toughness of 4.3 MPa·m^0.5 or more.

The invention relates to the technical field of the production process of a die casting die steel material, and specifically relates to a method for producing a long-fatigue life die casting die material. The method comprises the following steps: 1, selecting high-quality raw materials; 2, adopting the double refining of vacuum induction smelting and electroslag remelting; 3, six-side forging; 4, solution annealing; and 5, quality acceptance checking. The die casting material produced by the invention overcomes the disadvantage of the short thermal fatigue life of the traditional large hot die casting die, prolongs the service life of the die, and is mainly applicable to the die casting and extruding dies made of aluminum alloy, magnesium alloy and zinc alloy.

Provided herein are glass based articles comprising SiO₂, Al₂O₃, and two or more metal oxides selected from the group consisting of La₂O₃, BaO, Ta₂O₅, Y₂O₃, and HfO₂. The glass based articles typically are characterized by a high fracture toughness (e.g., at least 0.86 MPa*m^0.5), a high Young's modulus value (e.g., at least 85 GPa) and/or a stress optical coefficient (SOC) of not more than 3 Brewster (e.g., about 1.3 Brewster to about 2 Brewster). Also provided herein are glass based articles comprising SiO₂ and two or more of M_xO_y, wherein M is Ba, La, Ta, Y, Al or Hf; wherein the total amount of SiO₂ is the same or substantially the same as that of a reference glass based article comprising two or more binary compositions of M_xO_y—SiO₂, wherein the reference glass based article has the same molar percentage of each M_xO_y, and the molar ratio of M_xO_y to SiO₂ in each binary composition is 4/(c*x), wherein c is the number of charges of M.

The present invention relates to a stent, comprising: a plurality of radially-expandable rings arranged along a longitudinal axis, wherein each of the radially-expandable rings may include a plurality of bar arms and a plurality of crowns, the adjacent crowns being connected by the bar arms therebetween, and a plurality of connectors being disposed in between and connecting the radially-expandable rings, wherein the bar arms may include a first material, and the crowns may include a second material which may be different from the first material. Novel techniques for manufacturing a stent, such as 3D additive printing methods, could be used for realizing the disclosed stents.

The invention belongs to a preparation method of an explosion-suppressing material. The explosion-suppressing material comprises the following chemical compositions by weight percent: 0.3-0.5 percent of Si, 0.1-0.3 percent of Fe, 0.15-0.25 percent of Cu, 1.0-1.5 percent of Mn, 1.0-1.5 percent of Mg, 0.1-0.3 percent of Zn, 0.15-0.25 percent of Ti, 0.03-0.06 percent of La, 0.05-0.09 percent of Ce and the balance Al. A grain structure of the explosion-suppressing material is refined by adopting a repeated heating forging and pressing method. The explosion-suppressing material provided by the invention has excellent extrusion resistance, collapse prevention, zero dreg-falling and high-strength explosion-suppressing property. The performance indexes of the explosion-suppressing material, such as strength, plasticity, fracture toughness and fatigue resistance, are greatly increased according to the preparation method; the technology is simple and is easily performed; and the service life of the explosion-suppressing material is prolonged.

The invention relates to a preparation method of a gradient carbon fiber/hydroxyapatite (HA) composite material. The method comprises the following steps: performing compound modification on carbon fibers via low-temperature oxidation and a HA membrane layer pulling and drawing method; dispersing nanometer HA powder, an organic monomer acrylamide, a cross-linking agent N, N-methylene bisacrylamide, a dispersant sodium hexametaphosphate, an initiator ammonium persulfate, a catalyst N,N,N',N'-tetramethylethylenediamine and ammonium hydroxide into deionized water so as to prepare modified carbon fiber-HA duplex ceramic slurry; performing centrifugal molding on the duplex ceramic slurry; then taking out a centrifugal barrel and putting the centrifugal barrel into a water bath kettle so as to realize the curing molding of modified carbon fiber-HA gel; demolding a green body and then drying the green body in a drying box; and sintering the green body under the argon atmosphere in a tubular furnace so as to obtain the gradient carbon fiber-HA composite material. The method has the advantages that the content of carbon fibers at the bottom of the composite material is high, so that the strength and the toughness of the composite material can be improved during the load bearing; the content of HA at the top of the composite material is high, so that the osteoinduction and the biocompatibility of the composite material can be improved when the composite material is implanted into a human body; the centrifugal molding technology is adopted, so that the problem of stress concentration caused by the reason that the carbon fibers are likely to agglomerate during the dry pressing is solved, and thus the mechanical property of the composite material is improved.

The invention discloses a method for preparing a ceramic biological material with an abrasion self-remediation function in an in-vivo environment. The ceramic biological material comprises the following raw materials in percentage by mass: 90-99% of zirconia powder (alumina powder) and 1-10% of metal powder. The method comprises the following steps: putting the raw materials into a planet ball mill, uniformly mixing according to a wet method, drying, and performing hot-pressing sintering at 1100-1800 DEG C for 0.5-3 hours in the presence of an inert atmosphere. The metal doping mass ratio in the prepared ceramic biological material is within 1-10%; when the ceramic biological material is used as a friction accessory (such as an artificial joint and an artificial intervertebral disc) in a human body, because of fiction abrasion and corrosion, a layer of protein biological membrane can be formed on a friction interface, along with friction, the protein biological membrane can be converted into a graphite layer, and friction and abrasion of the ceramic biological material can be effectively reduced. Abrasion remediation of the ceramic biological material can be achieved, and the ceramic biological material is good in abrasion self-remediation function in the human body.

The invention provides a process for preparing laminar zirconium boride superhigh-temperature ceramic by a casting-impregnation method, which is characterized by comprising the following steps: (1) preparing a zirconium boride casting sheet by a casting method: evenly stirring adhesive, plasticizer and solvent, adding zirconium boride ceramic powder to form a casting material, carrying out casting molding, drying at room temperature, and demolding to obtain the casting sheet which is 200-1000 mu m thick; (2) impregnating the casting sheet in graphite or boron nitride slurry by an impregnationmethod so as to impregnate the casting sheet; (3) slicing the casting sheet according to the size of a mold; (4) superposing the sliced casting sheets into the mold, and degreasing in vacuum; and (5)carrying out hot pressed sintering in an argon atmosphere to obtain the laminar zirconium boride superhigh-temperature ceramic of which the fracture toughness is up to 8.3 MPa.m<1/2>. The fracture mode of the laminar zirconium boride ceramic is non-brittle fracture, i.e. the laminar zirconium boride ceramic gradually fractures while having certain tolerance to cracking damage, and has favorable performance.

The invention relates to a preparation technology of a high-comprehensive-performance aluminum-lithium alloy plate. The technology comprises the following steps that a cast ingot is subjected to temperature-controlled primary rolling, is rapidly cooled to the room temperature and then is placed into a high-temperature air circulation furnace to be heated, after heat preservation is performed for a period of time, the temperature is reduced to the specific temperature, the cast ingot is discharged from the furnace, secondary hot rolling is performed, and the cast ingot is rapidly cooled to the room temperature after being subjected to hot rolling to the specified size; and then the rolled plate is subjected to solid solution quenching, cold deformation and artificial aging treatment. By means of temperature-controlled hot primary rolling and rapid cooling after rolling, a Widmanstatten structure can be fully broken, appropriate deformation stored energy is reserved, the plate is recrystallized to a certain degree in the subsequent high-temperature heating process, flat and straight grain boundaries among grains in the hot-rolled plate are eliminated, and part of nested morphology is formed; through secondary rolling and rapid cooling at the specific temperature, a recrystallized structure can be transformed into a deformed structure again, and precipitation of large-size Widmanstatten is inhibited, so that the aluminum-lithium alloy treated to be in a final use state has excellent comprehensive performance.

The invention relates to a method for producing an 8021 aluminum alloy for a lithium battery by a casting method, and belongs to the field of aluminum processing. The method comprises the steps of batching, smelting, degassing and slag removing, standing, on-line degassing and filtering and casting; and the casting of the alloy component comprises the steps that aluminum alloy melt is smelted according to the chemical components of the 8021 aluminum alloy, then degassing and slag removing are carried out, the hydrogen content is monitored online and is qualified, and the aluminum alloy melt iscast into a metal plate ingot. According to the method for producing the 8021 aluminum alloy for the lithium battery by the casting method, the casting method is simple and convenient, and the 8021 aluminum alloy prepared by the method has good metallurgical performance, thermal processing structure performance and high strength and high toughness.

The invention provides a welding method for reducing the site-welding stress deformation of a thick-walled steel structure, and relates to a welding method. The problems that for an existing steel structure, adjustment of welding residual strain to a welding process is passive, cumbersome and difficult, and the structure of welding joints is poor in stability and anti-fatigue performance are solved. The method comprises the steps that multiple inlaid internal webs are arranged at welding grooves of welding groove at intervals in the length direction of a welding seam, wherein a skeleton systemstructure is jointly formed by welding groove walls of base materials and the inlaid internal webs; welding of the internal webs is conducted, wherein back gouging welding is adopted to ensure complete fusion between the internal webs and the base materials of the welding groove walls of the butt joints; and after the skeleton system structure of the butt joints is welded and formed, filling welding is conducted on a partition space formed by the welding groove walls of the base materials and the multiple inlaid internal webs in an enclosing manner, and cover surface welding is conducted in the longitudinal welding direction of the welding seam. The welding method is used for reducing the site-welding stress deformation of the thick-walled steel structure.