436 results about "Titanium matrix composites" patented technology

The invention relates to a graphene reinforced titanium-based composite and a preparation method thereof and belongs to the field of composites. The preparation method of the composite comprises the following steps of mixing graphene powder with absolute ethyl alcohol, then conducting ultrasonic dispersion, adding titanium powder in the stirring process, and obtaining mixed slurry; transferring the obtained mixed slurry into a ball milling pot, and conducting ball milling; removing the absolute ethyl alcohol from the slurry obtained after the ball milling, and obtaining powder; drying the obtained powder in a vacuum drying oven, and obtaining dried powder; placing the dried powder into a graphite die, introducing argon into a hot pressing furnace, applying 2-2.12 t of pressure to the graphite die, conducting heating till the temperature reaches 900-1300 DEG C at the heating rate of 10-12 DEG C/min, preserving the heat for 1-1.5 hours, conducting natural cooling till the room temperature is reached, and obtaining the graphene reinforced titanium-based composite, namely the product in the graphite die. The preparation method is simple in process, graphene is distributed uniformly in the obtained composite, and the impurity content is low.

The invention is suitable for the manufacture of flat or shaped titanium matrix composite articles having improved mechanical properties such as lightweight plates and sheets for aircraft and automotive applications, heat-sinking lightweight electronic substrates, bulletproof structures for vests, partition walls and doors, as well as for sporting goods such as helmets, golf clubs, sole plates, crown plates, etc. A fully-dense discontinuously-reinforced titanium matrix composite (TMMC) material comprises (a) a matrix of titanium or titanium alloy as a major component, (b) ceramic and/or intermetallic hard particles dispersed in the matrix in the amount of ≦50 vol. %, and (c) complex carbide- and/or silicide particles at least partially soluble in the matrix at the sintering or forging temperatures such as Ti₄Cr₃C₆, Ti₃SiC₂, Cr₃C₂, Ti₃AlC₂, Ti₂AlC, Al₄C₃, Al₄SiC₄, Al₄Si₂C₅, Al₈SiC₇, V₂C, (Ti,V)C, VCr₂C₂, and V₂Cr₄C₃ dispersed in the matrix in the amount of ≦20 vol. %. The method for manufacturing TMCC is comprised of the following steps: (a) preparing a basic powdered blend containing matrix alloy or titanium powders, dispersing ceramic and/or intermetallic powders, and powders of said complex carbide- and/or silicide particles, (b) preparing the Al—V master alloy containing ≦5 wt. % of iron, (c) preparing the Al—V—Fe master alloy fine powder having a particle size of ≦20 μm, (d) mixing the basic powdered blend with the master alloy powder to obtain a chemical composition of TMCC, (e) compacting the powder mixture at room temperature, (f) sintering at the temperature which provides at least partial dissolution of dispersed powders, (g) forging at 1500-2300° F., and (h) cooling. The resulting TMCC has density over 98% and closed discontinuous porosity after sintering that allows making hot deformation in air without encapsulating. The invention can be used to produce near-full density near-net shape parts from titanium matrix composite materials with acceptable mechanical properties without a hot deformation.

The invention relates to a titanium alloy integral blade disc with composite performance and a fabricating method thereof. A hub and a spoke of the blade disc are made of titanium alloy, a rim and a blade are made of titanium-base composite materials (or the whole disk is made of titanium alloy, and the blade is made of titanium-base composite materials), and the point of the blade also contains one or more of Cr, V, Mo with higher content so as to have properties of resisting temperature, abrasion and combustion. The hub and the spoke as well as the rim and the blade are sequentially prepared by piling layer by layer through adopting titanium alloy powder, one or more of titanium powder, TiC, B4C, and Cr3C2, and mixture powder of particles of one or more of Cr, V and Mo, which are synchronously conveyed and molten and deposited by adopting laser, so as to obtain the near net-shape titanium alloy integral blade disc with composite performance. The rim and the blade of the blade disc are integer, the hub and the spoke of the disc have high room temperature plasticity and strength as well as low cycle fatigue property, and the rim and the blade have high high-temperature fracture toughness property and high creep resistance.

The invention relates to a method for preparing an in situ titanium-based composite material and a part, and belongs to the fields of metal-based composite materials and preparation thereof. The method comprises the following steps of: preparing mixed powder of titanium alloy powder and powder of one or two of TiB2 and TiC, and stacking the mixed powder subjected to laser smelting deposition and synchronous delivery layer by layer to directly prepare the in situ titanium-based composite material and the near net shape part thereof. By the method, the composition and the proportion of the enhanced phase of the titanium-based composite material can be flexibly controlled, the prepared material does not contain un-smelted additional powder granules, and the material has higher high-temperature mechanical property.

The invention provides an electromagnetic induction heating assisted titanium matrix composite laser additive manufacturing device and method and belongs to the technical field of laser additive manufacturing. The device comprises a coaxial powder feeding laser deposition system and an electromagnetic induction heating synchronous auxiliary system. The coaxial powder feeding laser deposition system comprises a base plate, a deposition sample, a laser head and an infrared thermometer. The electromagnetic induction heating synchronous auxiliary system comprises an electromagnetic induction powersupply auxiliary unit, a coil, a steering heightening mechanism, a driven shaft and a transverse sliding groove. The coil is connected to the output end of the electromagnetic induction power supplyauxiliary unit. The coil and the laser head do synchronous movement to implement small-area real-time preheating and slow cooling on the deposition sample. The electromagnetic induction heating assisted titanium matrix composite laser additive manufacturing device can implement real-time preheating and slow cooling, reduce residual stress and the tearing tendency and improve the mechanical performance of a titanium matrix composite. The electromagnetic induction coil and the laser head do synchronous movement through the steering heightening mechanism to implement real-time small-area preheating and slow cooling on high-height big parts during laser additive manufacturing. The electromagnetic induction heating device doing synchronous movement with the laser head implements synchronous preheating and slow cooling on a base plate and a deposited layer, and thermal stress during laser additive manufacturing is reduced. The electromagnetic induction heating assisted titanium matrix composite laser additive manufacturing device can realize online annealing on a specific area by changing the position of the coil.

The powder metallurgical process for preparing Ti-base composite material with reinforcing granular phase features the addition of chromium carbide during preparing Ti alloy, with the C content being 5-15 vol%. Through mixing material, cold isostatic pressing formation, and vacuum sintering at 1200-1300 deg.c for 1-6 hr, the Ti alloy with reinforcing granular TiC phase is prepared. During the sintering, Ti and chromium carbide produce in-situ composing reaction to produce the reinforcing granular TiC phase. The emergence of the second granular phase fines the alloy crystal grains, blocks the expansion of cracks in the alloy and raises the performance of the alloy.

The invention relates to a preparation method of a TiC granule reinforcing Ti-Al-Sn-Zr-Mo-Si high-temperature titanium alloy composite material plate, relating to a preparation method of a titanium alloy composite material plate and solving the problems of high oxygen content and poor plasticity of TiC granule reinforcing titanium-base composite materials prepared by the traditional nonconsumable electrode melting preparation method. The preparation method comprises the following steps of: calculating the amounts of titanium powder, graphite powder and other materials according to the volume percent of TiC granules and Ti-Al-Sn-Zr-Mo-Si high-temperature titanium alloys which are contained in the composite material plate; then preparing the titanium powder and the graphite powder into prefabricated blocks; then placing the prefabricated blocks and the other materials into a vacuum water-cooling copper crucible induction melting furnace for melting so as to obtain cast ingots; and then carrying out forging, rolling and heat treatment on the cast ingots to obtain the composite material plate with the oxygen content of 200 ppm-800 ppm and 2-10 percent of elongation percentage.

The invention discloses a method for preparing an ultra-fine grain titanium-based composite material by adopting equant bending channel deformation. According to the method, a (TiB+TiC)/TC18 titanium-based composite material is subjected to 600 DEG C-extrusion deformation by designing an extrusion die with 90-degrees corners, and the deformation pass is respectively one pass, two passes and three passes. The titanium-based composite material comprises the following components in percentage by mass: 5% of Al, 5% of Mo, 5% of V, 1% of Cr, 1% of Fe, 0.2% of B4C and 82.8% of Ti, and the molar ratio of generated TiB reinforcement to generated TiC reinforcement is 4: 1. The ultra-fine grain titanium-based composite material prepared by the method has high strength and relatively good plasticity under the condition that the size of the material is not changed, and can be widely applied to the field of aeronautical manufacturing.

The invention discloses a method for directly preparing a molding titanium matrix composite through titanium hydride powder. The method comprises following steps: blank preparing, wherein the titanium hydride powder and an additive are mixed and are manufactured into a powder compact through mould pressing; dehydrogenation, wherein the powder compact is heated, the heating rate keeps ranging from 50 DEGC/min to 200 DEG C/min until the temperature of the powder compact rises to 900 DEG C to 1500 DEG C, and the powder compact keeps warm for 5 minutes to 30 minutes at the selected temperature; molding, wherein the heated powder compact is moved into an extrusion device, extrusion is carried out at the certain pressure and the certain extrusion ratio so as to enable the powder compact to pass through an extrusion die, molding and solidifying are carried out, and the titanium matrix composite is formed; and cooling, wherein after extrusion is completed, the titanium matrix composite is cooled to the room temperature at the speed of 10 DEG C/min to 100 DEG C/min, and then is taken out. Raw material cost is reduced, the technological process is shortened, and introduction of impurities in the subsequent machining process is reduced. The method has the beneficial effects of being high in dehydrogenation speed, high in product compactness, and good in mechanical property.

The present invention provides a novel titanium-based composite oxide being usable as an electrode material for a lithium secondary battery and having a high capacity and an excellent cycle stability, a method for producing the same and a lithium secondary battery using the titanium-based composite oxide. Disclosed is a compound obtained by compositing titanium oxide with elements other than titanium, specifically a titanium-based composite oxide wherein the relevant chemical formula is Ti_(1-x)M_xO_y, M is the element Nb or the element P, or a combination of these two elements in an optional ratio therebetween, x is such that 0<x<0.17, y is such that 1.8≦y≦2.1, x is the sum of Nb and P when M is a combination of the element Nb and the element P, and the present invention provides a lithium secondary battery using as an electrode the titanium-based composite oxide.

The invention relates to a preparation method of a graphene-enhanced titanium-based material. The preparation method comprises the following steps: firstly performing modification treatment on atomized spherical titanium powder by using a surface modifier; uniformly mixing the powder by virtue of a method of ultrasonic wave and ball-milling; and finally, performing spark plasma sintering and hot isostatic pressing on the mixed powder to be sintered. The preparation method provided by the invention solves the problem that graphene is not uniformly dispersed in the graphene-enhanced titanium-based material and generation of a TiC phase is effectively inhibited. The graphene-enhanced titanium-based material prepared by the preparation method provided by the invention is high in dispersity and compactness and can effectively inhibit generation of TiC.

The invention relates to a preparation method of a directionally-distributed TiB whisker reinforced titanium-based composite material, and belongs to the field of metal-based composite materials. Thepreparation method comprises the following steps that nano TiB2 powder and titanium powder, or nano TiB2 powder and titanium alloy powder are uniformly mixed; sintering treatment is carried out on themixed powder by adopting a discharge plasma system to obtain a composite material block body; and the dried composite material block body is packaged in a quartz tube in a vacuum mode, heat treatmentis carried out in a heat treatment furnace, and then the composite material is obtained by step-by-step cooling. The method can effectively regulate and control the organization evolution of a TiB whisker in the titanium-based composite material, the problem that the orientation regulation and control means of the TiB whisker is single is fully solved, a thermal deformation means is used for regulating and controlling the crystal whisker form, and the crystal whisker length-diameter ratio is greatly reduced and the like.

The invention relates to a preparation method of a TiB nano-reinforced titanium-based composite material, and belongs to the field of metal-based composite materials. According to the method, the composite material is prepared through ball milling, spark plasma sintering and hot rolling. The original powder is prepared through ball milling, the advantages that the sintering efficiency of the discharge plasma is high, and the external pressure and the sintering atmosphere can be controlled are utilized, so that under the low sintering temperature and the high pressure, and on the premise that the TiB2 particles and the surrounding titanium or titanium alloy matrix do not generate in-situ reaction, a sintering block body with high compactness is prepared; and finally, the TiB2 particles in the sintered block body are subjected to in-situ reaction with the surrounding titanium or titanium alloy matrix through hot rolling to form whiskers, and meanwhile, the crystal grains of the matrix are deformed, the porosity in the structure is reduced, and the strength and the plasticity of the composite material are improved. The TiB nano crystal whisker generated in situ in the method is cleanin surface and is uniformly distributed in a matrix and free of agglomeration, has good interface bonding and lattice relationship with the titanium matrix, and can effectively refine matrix crystal grains.

The invention relates to a method for preparing a carbon nano tube enhanced titanium-base compound material by in-suit reaction in order to solve the problems of low uniform dispersion and low structural completeness of a carbon nano tube in the conventional method for preparing the carbon nano tube enhanced titanium-base compound material and pollution to the titanium-base material caused by reaction of a carbon group and a titanium base body. The method comprises the following steps of: adding nickel nitrate hexahydrate and TiH2 powder into an ethanol solution, stirring and evaporating to obtain Ni-TiH2 compound powder; paving the Ni-TiH2 compound powder in a quartz boat, putting the quartz boat into deposition equipment, feeding H2, raising temperature, feeding CH4, and after the deposition is finished, stopping feeding the CH4 so as to obtain carbon nano tube/TiH2 compound power; pressing the carbon nano tube/TiH2 compound power into a block body, sintering, and re-pressing to obtain the carbon nano tube enhanced titanium-base compound material. Carbon nano tubes in the compound material are uniform to disperse and cannot be aggregated; the compound material is high in purity and has a complete structure; and reaction between the titanium and the defected carbon nano tube can be avoided.

A casting method of a high-volume-fraction reinforced-phase titanium-based composite material casting relates to casting methods of titanium-based composite materials. The casting method of the high-volume-fraction reinforced-phase titanium-based composite material casting is used for solving the problems that existing high-volume-fraction reinforced-phase titanium-based composite material gravity casting methods are high in mold filling difficulty and cannot guarantee internal quality easily as well as centrifugal casting methods are complex in processes and low in material utilization rate. The casting method of the high-volume-fraction reinforced-phase titanium-based composite material casting mainly comprises the steps of, firstly, manufacturing a suction casting mold; secondly, melting high-volume-fraction reinforced-phase titanium-based composite material casting ingots; thirdly, smelting the casting ingots, and rotating and remelting the casting ingots twice; fourthly, preparing re-smelting of the casting ingots; fifthly, performing vacuum melting to obtain superheated melt; sixthly, switching on a vacuum system of the suction casting chamber of a vacuum electric arc smelting furnace, pushing a suction casting button and performing suction casting mold filling and cooling to obtain the casting. The casting method of the high-volume-fraction reinforced-phase titanium-based composite material casting is applied to preparation of the high-volume-fraction reinforced-phase titanium-based composite material casting.

The invention relates to preparation methods of a layered titanium matrix composite material. The invention aims to solve the technical problem that current layered titanium matrix composite material is poor in plasticity. One of the methods comprises the steps of: ball-milling Ti particles and TiB2 powder and adding a polyethylene glycol solution into the Ti particles and TiB2 powder to agitate for forming a pasty shape; coating the paste between Ti plates; drying the Ti plates to obtain a sandwich type slab; and then hot-forming to obtain the layered titanium matrix composite material. The other one of the methods comprises the steps of: ball-milling Ti particles and TiB2 powder and adding a polyethylene glycol solution into the Ti particles and TiB2 powder to agitate for forming a pasty shape; pugging with a double rolling mill; then becoming mouldiness; then rolling into membranes by the double rolling mill; clamping the membranes between the Ti plates and pressing to obtain the sandwich type slab; and then hot-forming to obtain the layered titanium matrix composite material. The coefficient of elongation of the layered titanium matrix composite material prepared by the invention is 16-18% and the layered titanium matrix composite material can be applied to the aerospace field.

The present invention relates to material technology, and is Re2O3, TiB and TiC reinforced Ti-base composite material and its preparation process. The reinforced Ti-base composite material has the components, including RE hexaboride 0.01-4.31 wt%, boron carbide 0.01-4.58 wt%, alloying elements 0-11.04 wt% and Ti for the rest. It is prepared through mixing Ti powder, RE hexaboride, boron carbide and alloying elements; pressing the powder mixture to form green compact; sintering in a vacuum sintering furnace and cooling in the furnace. The present invention can prepare high performance Ti-base composite material simply in low cost, and the prepared Ti-base composite material may have different reinforcer contents, molar proportions and alloy components.

The invention relates to an ultrasonic detection method for different technical stages of a composite blade ring. A pulse echo type water-leaching focused ultrasound C scan method is adopted for performing ultrasonic detection on the whole blade ring. The ultrasonic detection method comprises the following steps: firstly, respectively performing water-leaching focused ultrasound C scan detection on interior defects of a titanium alloy inner ring and outer ring forge piece to be used for making the whole blade ring; detecting a joint interface in an integrally formed blade ring after being subjected to cellosilk winding and inner and outer ring hot isostatic pressure, namely with a 5-10MHz water-leaching focused probe, respectively performing C scan imaging on an interface signal and a bottom wave signal; and detecting the bonding quality of a metal/metal interface between the inner and outer rings of titanium alloy and a metal/fiber interface between titanium alloy and silicon carbide cellosilk. The ultrasonic detection method can be adopted for comprehensively controlling the inner quality and interface bonding quality of the whole blade ring of silicon carbide fiber enhanced Ti-based composite and has the advantages of strong operability, high detection sensitivity and direct detection result.

The invention provides a titanium-based composite armor and a manufacturing method thereof. The titanium-based composite armor comprises an upper layer, a middle layer and a lower layer, wherein the upper layer and the lower layer are titanium alloy layers, the middle layer is a titanium alloy and ceramic composite layer and is provided with a titanium alloy space lattice structure, and the titanium alloy and ceramic composite layer is divided into a plurality of unit modules by the space lattice structure. The manufacturing method of the titanium-based composite armor comprises the steps of designing a sandwich structure with the space lattice structure through CAD software and forming the sandwich structure through the electron beam selective melting technology; filling the formed sandwich structure with titanium alloy and ceramic mixtures; carrying out hot isostatic pressing for obtaining the titanium-based composite armor. The titanium-based composite armor is of a multilayer structure, the middle layer is provided with the titanium alloy space lattice structure, titanium-based composite modularization is realized, and therefore the destruction range of shooting of a single bullet can be limited, and the multiple bullet shooting resistance of armor material can be improved.