38 results about "Nickel titanium" patented technology

The invention discloses a bionic Voronoi-nickel titanium-hydrogel heterostructure implant and a preparation method thereof, and relates to the technical field of bone implantation, the construction of a Voronoi porous structure and the preparation of a bionic Voronoi-nickel titanium skeleton are completed through an innovative design method by referring to the structural concept of human bone trabecula, and then the bionic Voronoi-nickel titanium skeleton is used as a substrate to prepare the bionic Voronoi-nickel titanium hydrogel heterostructure implant. And preparing the bionic Voronoi-nickel titanium-hydrogel heterostructure implant by adopting a drying gel forming method. The implant integrates the mechanical advantages of high strength and low modulus of the nickel-titanium alloy and the structural characteristics of high connectivity and high specific surface area of the bionic Voronoi porous structure, the defect that hydrogel is weak in bearing is effectively overcome, meanwhile, the hydrogel has the buffering and energy absorbing effects, multifunctional time sequence delivery and release of antibiosis, anti-inflammation and bone regeneration promotion can be achieved, and the requirements of all stages of bone repair are met.

The utility model discloses a thermal power plant air preheater with nickel titanium alloy function coating belongs to air preheater technical field, a thermal power plant air preheater with nickel titanium alloy function coating includes the shell, a layer nickel titanium alloy function coating covers the shell outside, the heat exchange subassembly is rotationally arranged in the shell, the shell upper and lower sides are provided with the air inlet, the air outlet, the smoke outlet and the smoke inlet respectively with heat exchange subassembly intercommunication, this technical scheme can set up nickel titanium alloy function coating, can prevent the wall thickness thinning of air preheater because of abrasion, reduce the air preheater's air leakage rate, improve equipment overall integrity, and then reduce the maintenance use cost, can reduce the environmental pollution caused by the abrasion problem of air preheater simultaneously.

The invention discloses a titanium alloy-nickel titanium alloy heterogeneous material adopting a bionic shell microstructure interface and a preparation method thereof.The method comprises the steps that the interface is designed, a plurality of seed points are taken on the top face, vertical bisectors are made after the adjacent seed points are connected, and the intersection point between the vertical bisectors and the intersection point between the vertical bisectors and the boundary of the top face serve as vertexes; and the vertexes are connected in the direction perpendicular to the bisector to obtain a plurality of closed pattern units, the whole pattern serves as an interface pattern, and the titanium alloy layer, the interface layer and the nickel-titanium alloy layer are molten and solidified layer by layer through a laser powder bed to obtain the titanium alloy-nickel-titanium alloy heterogeneous material. According to the method, the interface problems of cracks, defects and the like of interface brittle intermetallic compounds caused by overlarge interface residual stress in the laser powder fusion process are solved, and the titanium alloy-nickel titanium alloy heterogeneous material which is good in interface metallurgical bonding, free of cracks and high in bonding strength is finally formed.

The utility model provides a novel cardiac pacemaker lead fixing device belongs to medical appliance technical field, this novel cardiac pacemaker lead fixing device, include: lead body, the inside of lead body is equipped with thin metal wire, and the surface is provided with rotating handle. The utility model: the lead body is passed through the protection sheath pipe, and the anchor head end structure of lead body one end is moved to the inside of heart, until the main helical silk of nickel titanium alloy is made on the anchor head end and is fixed with the outer layer of myocardium, further adjusts the rotating handle on the surface of lead body to make the electrode end continue to move, the diameter between a plurality of inner layer's auxiliary micro helical silk changes in the process of rotating to drive a plurality of anchor block rotation and move and pass through endocardium, cooperate a plurality of anchor block surface's anchor hook and enhance the stability of lead body fixed, realize the purpose of anchor head end grading anchor operation.

The utility model belongs to the technical field of rubber dam cloth, specifically relates to a rubber dam cloth with clip, including rubber dam cloth body and rubber dam clip, the middle position of rubber dam cloth body is equipped with tooth placing gap for placing tooth, the part of rubber dam cloth body on the peripheral side of tooth placing gap is barrier cloth turn -up portion, two end parts of rubber dam clip are clip clamping parts, two clip clamping parts and barrier cloth turn -up portion fixed connection, the material of rubber dam clip and clip clamping part is plastic, stainless steel, nickel titanium alloy, silica gel, silicon rubber or synthetic resin, the fixed connection of clip contact block has in clip clamping part, and clip contact block and barrier cloth turn -up portion fixed connection. The utility model can reduce the gap between tooth and rubber dam cloth, reduce the phenomenon that medicine passes through gap and flows into the inside of mouth cavity.

The utility model discloses a double-layer nasobiliary drainage tube capable of effectively protecting tissues, which comprises an inlet end part at the front end of the nasobiliary drainage tube, which firstly enters a human body, and an elastic tubular supporting tube structure with elasticity, and meshes or first drainage holes which are not smaller than drainage holes are arranged on the elastic supporting tube structure corresponding to the drainage hole area; the flexible tube structure is attached to the outer side of the elastic supporting tube structure, or the elastic supporting tube is embedded in the flexible tube structure, the flexible tube structure is made of flexible rubber materials, the flexible rubber materials include but not limited to related medical flexible materials such as silica gel materials and latex materials, and the elastic supporting tube structure is made of memory alloy fibers. The memory alloy fibers are nickel-titanium memory alloy fibers or other alloy fibers; in addition, the drainage tube is connected with a three-way connector capable of adjusting an open passage. Through the arrangement, it is guaranteed that the soft pipe structure provides direct contact protection; the elastic supporting tube structure provides elastic buffer protection, reduces damage to tissues, and can also ensure the safety of leading-out and leading-in of liquid.

The utility model belongs to the technical field of net bag processing, and particularly relates to a sight glass fetching net bag which comprises two nickel-titanium alloy wires, the central parts of the two nickel-titanium alloy wires are mutually fixed, the four ends of the two nickel-titanium alloy wires are jointly and fixedly connected with a connecting rod, and the mutually fixed position of the central parts of the two nickel-titanium alloy wires extends outwards and is fixedly provided with an end cap. The central parts of the two nickel-titanium alloy wires are fixed through forming processing equipment; the two nickel-titanium alloy wires are fixedly installed to form four strands of nickel-titanium alloy wires which are installed on the outer side of the connecting rod, so that the four strands of nickel-titanium alloy wires are matched to clamp foreign matters when the endoscope is used, and the two nickel-titanium alloy wires can be uniformly and fixedly installed through the four arc-shaped plates in the forming process. And meanwhile, the two nickel-titanium alloy wires can be more conveniently formed in cooperation with sliding of the bending assembly and the arc-shaped plate.

The application discloses a kind of biomimetic Voronoi-nickel titanium-hydrogel heterostructure implants and preparation method thereof, it is related to bone implant technical field, draw lessons from the structural concept of human bone trabecula, complete the preparation of Voronoi porous structure construction and biomimetic Voronoi-nickel titanium skeleton by innovative design method, again with the biomimetic Voronoi-nickel titanium skeleton as base, adopt drying gel method to prepare biomimetic Voronoi-nickel titanium-hydrogel heterostructure implant.The implant integrates the mechanical advantages of high strength, low modulus of nickel titanium alloy and the structural characteristics of high connectivity, high specific surface area of biomimetic Voronoi porous structure, effectively makes up the short board of hydrogel bearing weakness, while hydrogel has buffering energy absorption function, can realize the multi-functional time sequence release of antibacterial, anti-inflammatory, bone regeneration promotion, adapt to the needs of each stage of bone repair.

The invention relates to the technical field of metallurgical engineering, in particular to a production method of nickel-iron alloy for metallurgy. The method comprises the following steps that the high-nickel-titanium metallurgical waste is divided into a plurality of categories according to the nickel content and the titanium content; and the multiple types of waste materials are subjected to smelting and post-treatment correspondingly, and finished nickel-iron alloy products with different nickel contents are obtained. According to the method, high-valued recovery of nickel and titanium resources in the waste is achieved through fine classification, multi-stage refining control and vacuum purification of the waste, the produced high-purity nickel-iron alloy can be directly used for smelting high-end maraging steel, degradation use is effectively avoided, the raw material cost is remarkably reduced, and the resource utilization rate is increased.

The present application relates to a kind of biological medical titanium alloy surface modification method, belong to laser application technical field.The method first utilizes femtosecond laser to process groove-micro ripple composite structure on the surface of clean polished nickel titanium alloy material;Then, rich nanometer sheet is formed on the basis of the structure by alkali heat treatment, and groove-micro ripple-nanometer sheet multistage micro-nano composite structure is obtained;Subsequently, the multistage micro-nano composite structure is placed in the alkaline Tris buffer solution containing hydrochloric acid dopamine to coat polydopamine coating;Finally, the multistage micro-nano composite structure with polydopamine coating is placed in silver nitrate solution to load silver ion, complete titanium alloy surface modification, realize the promotion of titanium alloy bioactivity, bone integration ability and anti-bacterial infection ability.

The utility model relates to the technical field of winding devices, in particular to a nickel-titanium memory alloy wire winding device which mainly comprises an equipment body and an adjusting assembly, an adjusting block is arranged on the equipment body, and the adjusting assembly is arranged on the adjusting block and comprises a lead screw arranged on the adjusting block. According to the nickel-titanium memory alloy wire winding device, an alloy wire is controlled to be wound around a connecting shaft between two sets of guide wheels by several circles, then the alloy wire is wound around a corresponding winding drum, then the winding drum is controlled to rotate, so that the alloy wire is wound around the winding drum, and when the alloy wire is in a loose or tight state, the alloy wire is wound around the winding drum by controlling rotation of a motor; therefore, the supporting rod can be driven to rotate through movement of the threaded block, the support can be driven to rotate, the alloy wire can be driven to move upwards or downwards, the alloy wire can be kept in a tight state in the winding process, and then the alloy wire can be evenly wound on the winding drum through movement of the adjusting block.

The invention discloses nickel-titanium core wire chemical etching equipment, and relates to the technical field of etching equipment. Comprising a base, and further comprises an etching machine arranged above the base; the feeding box is arranged on the upper portion of the base; the discharging box is arranged on the upper portion of the base; the number of the feeding and discharging mechanisms is two, each feeding and discharging mechanism comprises a first sliding block, a roller and a second channel, and the rollers are used for restraining the movement route of the raw materials; the processing mechanism is connected with the first sliding block, the processing mechanism comprises an adjusting column, the adjusting column is connected with the first sliding block, a spraying assembly is arranged outside the adjusting column, a drying assembly is arranged outside the spraying assembly, and the first sliding block is used for adjusting the relative positions of the spraying assembly and the drying assembly to the raw materials. According to the nickel-titanium core wire chemical etching equipment, the purpose of improving the use efficiency of the equipment is achieved.

The utility model discloses an assembly type self-resetting beam column connecting joint, it includes first steel beam, second steel beam, first steel beam left end part is connected with steel column, and first steel beam right end part sets up first beam side end plate, and first beam side end plate sets up first lug plate, and the first lug plate is connected with the second lug plate through the pin shaft pivot, and the first beam side end plate is equipped with a plurality of nickel titanium alloy bolt rods between second beam side end plate, and the left and right end of nickel titanium alloy bolt rod respectively passes corresponding side first through -hole, second through -hole, and the left and right end of nickel titanium alloy bolt rod is fastened in corresponding side's first beam side end plate, two beam side end plate through nut respectively, and part nickel titanium alloy bolt rod is located on the pin axle upper end side, and part nickel titanium alloy bolt rod is located on the pin axle lower end side, through above -mentioned structural design, the utility model has novel, energy -dissipating effect is good and the advantage that construction is convenient.

The utility model discloses an energy -saving building ventilation structure, including outer support, the first connecting block is fixedly connected on the outer support, the first connecting block downside fixedly connected with frame, the frame side end is equipped with the fourth sliding slot, the frame inboard is equipped with the third sliding slot, the frame inboard is equipped with memory alloy drive strip, the tail end fixed connection of memory alloy drive strip is in the frame, memory alloy drive strip adopts nickel titanium alloy material, an energy -saving building ventilation structure passes through the temperature control shape change characteristic of nickel titanium alloy memory drive strip, combines the variable amplification effect of lever structure, realizes the full -automatic adjustment of louver angle, does not need motor, sensor etc. electrical parts drive, when high temperature, louver full -open promotion ventilation, accelerates air conditioning outdoor unit heat dissipation, makes air conditioning compressor improve operating efficiency, indirectly reduces air conditioning energy consumption, when low temperature, louver resets, reduces the invasion of cold air, reduces winter heating energy consumption.

This invention discloses a solution-treated and aging-treated anti-cavitation nickel-titanium alloy coating and its preparation method, belonging to the field of laser cladding coating technology. It includes a pure nickel transition layer and a nickel-titanium alloy coating formed by metallurgical bonding on the surface of a stainless steel substrate. The nickel-titanium alloy coating is formed by high-speed laser cladding of nickel-titanium powder onto the surface of the pure nickel transition layer, followed by solution treatment and aging treatment. Through solution treatment, Ni2Ti4O generated in the laser-clad NiTi coating... x Resolution treatment reduces component and microstructure segregation caused by unbalanced solidification during laser cladding, resulting in a homogenized coating microstructure with a single austenitic B2 phase. Then, aging treatment induces the redeposition of finely dispersed Ni2Ti4O3 within the coating. x Ni4Ti3 reduces the amount of O dissolved in the grains, improves its phase transformation behavior, and adjusts it to a suitable phase transformation range, thereby giving it a suitable critical stress for inducing phase transformation and a high resistance to dislocation movement, thus reducing cavitation damage and improving its resistance to cavitation.

The invention relates to the technical field of robots, in particular to a deformable robot framework based on nickel-titanium alloy, which comprises a framework body, a driving area is arranged on the left surface of the framework body, the framework body is rotationally connected through the driving area in a linear array shape, a fixing mechanism is arranged on the right surface of the framework body, and the fixing mechanism comprises a mounting plate. A groove is formed in the right surface of the mounting plate, a clamping rod penetrates through the groove of the mounting plate and is slidably connected with the groove, the clamping rod is fixedly connected with one end of a first spring, a sliding groove is formed in the inner surface of the mounting plate, a clamping cutter is slidably connected into the sliding groove of the mounting plate, and the clamping cutter is fixedly connected with one end of a second spring. By means of the clamping rod, the first clamping groove, the second clamping groove and the clamping knife, the framework 1 can improve the replacement efficiency when the head (such as a clamping jaw, a starting clamp, a detection module and a camera) for work is replaced.

The present application belongs to the technical field of nickel-titanium memory alloy fatigue resistance testing, in particular to a nickel-titanium memory alloy additive manufacturing fatigue resistance testing device. The following scheme is proposed, including a test base and a clamp assembly. The clamp assembly is provided with two fixed clamps and two movable clamps. The movable clamps and the fixed clamps can move horizontally between the two sides. The movable clamps are connected with a moving assembly. The moving assembly is connected with the movable clamps through magnetic attraction. The movable clamps can move horizontally between the two ends through the moving assembly. The test base top is provided with a pressure sensor corresponding to the position of the movable clamps. The fixed clamps and the movable clamps arranged at four positions, the disconnection mode of the magnetic attraction of the moving assembly, and the pressure sensor detect and record the change of the impact force and the time period of the nickel-titanium memory alloy additive in the rebound reciprocation, so as to improve the accuracy of the actual test and improve the work efficiency.

The utility model relates to the related technical field of electric beds, which comprises an electric bed, the upper end of the electric bed is provided with a spring for buffering and damping, the outer ring of the spring is sleeved with a wrapping layer for enhancing the supporting performance and the springback speed, and the upper end of the electric bed is provided with a supporting strip for supporting. Elastic frameworks used for dispersing pressure are fixedly installed at the two ends of each supporting strip in a penetrating mode, the nickel-titanium memory alloy springs absorb dynamic loads through elastic deformation of the nickel-titanium memory alloy springs, the shape memory effect of the nickel-titanium memory alloy springs can automatically rebound and reset after being loaded and compressed, and longitudinal permanent deformation is restrained; the high-support memory foam wrapping layer which is spirally and tightly wrapped outside synchronously limits radial expansion of the spring through physical constraint, uniformly disperses pressure and improves the rebound speed, is tightly attached to the outer surface of the high-strength engineering plastic supporting strip, and is matched with the three-dimensional hexagonal honeycomb elastic framework to form rigid support; the pressure is uniformly dispersed through the hollow truss reinforcing ribs and the honeycomb structure.

The application discloses a kind of high-performance multifunctional cable and preparation method thereof, belong to cable technical field, including the following steps: step one: nickel titanium wire is stretched to produce strain, after insulating layer is coated on its surface, shape memory alloy wire is obtained, shape memory alloy wire is tightly fixed in the inner cavity of polytetrafluoroethylene mold;Step two: the solution of phenolic resin prepolymer containing thermochromic microcapsule, MXene / ethanol dispersion, silica sol are mixed to obtain mixed sol, the pH value of mixed sol is adjusted, multifunctional composite sol is obtained after stirring;Step three: multifunctional composite sol is injected into polytetrafluoroethylene mold in which shape memory alloy wire has been fixed, and modified multifunctional composite gel is obtained after gelation and modification;Step four: modified multifunctional composite gel is supercritical CO2 drying, and multifunctional composite aerogel is obtained;Step five: multifunctional composite aerogel is filled between conductor with insulating layer and cable outer skin.

A guide wire includes a core wire. The core wire includes a first wire having a proximal end and a second wire having a distal end joined to the proximal end of the first wire. The first wire is formed of a nickel titanium alloy. The second wire is formed of a cobalt chromium alloy. The core wire includes one or more projections projecting from a joint surface between the first wire and the second wire toward a distal end side of the core wire in a longitudinal cross section including the joint surface. The one or more projections are formed of an alloy containing at least one element forming the nickel titanium alloy and at least one element forming the cobalt chromium alloy.

The utility model relates to a high development pulmonary nodule positioner, including metal alloy wire, push rod and puncture needle, the metal alloy wire is the spring structure formed by the winding of nickel titanium wire, the head end of metal alloy wire is elliptical, the tail end of metal alloy wire is connected with the suture line through the development tube, after metal alloy wire is straightened, the suture line is connected with the puncture needle. The metal alloy wire is close to the head of the puncture needle, and the rear end of the push rod is inserted into the puncture needle. According to the high-development pulmonary nodule positioning device, the metal wires are made of nickel-titanium alloy materials, the metal wires made of the nickel-titanium alloy materials are closely wound so that the metal wires can be more flexible, human tissue can be effectively protected, the tail connecting suture line and the connecting pipe are made of platinum-iridium materials, the development effect is achieved, the focus position can be positioned more easily, deviation is not prone to occurring, and the positioning effect is good. Damage to the human body is small, and convenience is brought to thoracoscope pulmonary nodule resection.

The present application relates to the technical field of metal material processing, and particularly relates to a high-energy electric stimulation softening method for a nickel-titanium bearing alloy, which comprises the following steps: placing a nickel-titanium bearing alloy bar in a transmission mechanism, arranging a high-energy electric stimulation power supply on the transmission mechanism, starting the transmission mechanism to move the nickel-titanium bearing alloy bar, and starting the high-energy electric stimulation power supply to stimulate and soften the nickel-titanium bearing alloy bar by applying an electric current. In the process of high-energy electric stimulation, the time for stimulating and softening any part of the nickel-titanium bearing alloy bar is within 360 seconds, and the maximum temperature is 300 degrees Celsius. Compared with the pulse power supply treatment mode using Joule heat, the temperature is lower, and there is no need to occur solid solution and precipitation phase change. The traditional heat treatment mode cannot obtain uniform non-coherent phase. The high-energy electric stimulation fully utilizes non-thermal energy to avoid oxidation of the nickel-titanium bearing alloy, and realizes the transformation from the metastable state of the completely coherent phase to the stable state of the non-coherent phase.

The utility model discloses a centrifugal grinding device for improving nickel titanium wire processing precision, which comprises a drying device body, a base is arranged in the device body, a centrifugal chamber and a blanking plate are arranged in the base, connecting shafts are arranged at the left end and the right end of the centrifugal chamber, a grinding box is arranged in the centrifugal chamber, and a support frame is arranged on the outer side wall of the centrifugal chamber. A mounting groove is formed in the grinding box, a stirring rod is inserted into the mounting groove, a mounting plate is connected to the upper portion of the stirring rod, a screw hole is formed in the mounting plate, a butt joint plate is arranged at the front end of the grinding box, a cover plate is arranged at the front end of the butt joint plate, a connecting rod and a fixing column are arranged in the supporting frame, and a treatment box is arranged below the discharging plate. A filter screen is arranged in the treatment box, and a pull ring is arranged on the outer side wall of the treatment box, so that grinding materials can be more uniformly distributed on the surfaces of the nickel-titanium wires, the grinding uniformity is improved, the grinding reaction is accelerated, and the situation that the grinding precision of the device is affected due to excessive or insufficient local grinding is avoided.

The utility model relates to the technical field of acupuncture and moxibustion, in particular to a nickel-titanium alloy acupuncture and moxibustion needle which comprises a needle body and a needle handle. The needle body is a nickel-titanium alloy needle body; the needle body comprises a needle main body and a needle tip which are connected with each other; the needle handle is connected to the needle main body; the size of the needle tip is gradually reduced in the direction from the needle handle to the needle tip; and the direction of the needle handle towards the needle tip is parallel to the length direction of the needle main body. Due to the hyperelastic characteristic of the nickel-titanium alloy acupuncture needle, the needle inserting process is smoother, and therefore the pain feeling of a patient is relieved. The size of the needle tip is gradually reduced in the direction from the needle handle to the needle tip, and through the special design, it can be seen that the needle tip has a gradual sharp shape, so that the needle tip has good penetrability, and it can be guaranteed that when skin and tissue are punctured, the pain feeling of a patient is reduced due to the fact that puncture resistance is reduced; unnecessary damage to surrounding tissues can be avoided, and the acupuncture treatment effect and safety are improved.

A medical device according to the present invention has a first region having a first characteristic, and a second region positioned closer to the base end side than the first region and having a second characteristic. For example, the medical device includes a specific member located in the first region and the second region and containing a nickel titanium alloy. The first characteristic includes a feature of the average crystal grain size of the nickel titanium alloy being a first size, and the second characteristic includes a feature of the average crystal grain size of the nickel titanium alloy being a second size smaller than the first size.

The utility model provides a double -faced nickel titanium silver wafer evaporation system relates to the technical field of semiconductor manufacturing. Double -faced nickel titanium silver wafer evaporation system includes planet disc and first apron, is provided with the plating area on planet disc, and wafer is placed in the plating area, and first apron covers in wafer front and is located the one side of planet disc towards evaporation machine inner cavity, and first apron surface is provided with nickel titanium silver plating area, and nickel titanium silver plating area is set to open -worked structure, and is provided with rotating mechanism in the plating area, and wafer is connected in rotating mechanism. The utility model adds first apron on wafer front, and the open -worked nickel titanium silver plating area is reserved on first apron, and nickel titanium silver metal is plated on the wafer surface corresponding to the open -worked nickel titanium silver plating area, and the non -open -worked area will not be plated nickel titanium silver metal. The utility model still sets up rotating mechanism in the plating area of planet disc, avoids the tedious operation that manual will take up wafer and turn over and re -clips to the plating area, saves the manpower, and improves the plating efficiency.

The utility model provides a kind of ureteral stricture support, belong to ureteral stricture support technical field, including ureteral stricture support, folding unfolding and quick installation dismantling component and protection reinforcing component, folding unfolding and quick installation dismantling component include the magnetic pole being set in the inside of several arc plates, ureteral stricture support is made of nickel titanium memory alloy, ureteral stricture support is spiral corrugated, the utility model has beneficial effect: by the nickel titanium memory alloy of being provided, it is convenient to use personnel when using, by placing ureteral stricture support in temperature is twenty-five degrees below, realizes superelasticity using nickel titanium memory alloy, use personnel cooperates with spiral corrugated, and then realizes ureteral stricture support folding compression, when using, use personnel can install it in patient body, contact body temperature, ureteral stricture support will hair shape memory effect, restore preset spiral corrugated, to support.

The invention discloses an electroplated nickel-titanium material as well as a preparation method and application thereof, and relates to the technical field of metal electroplating. The preparation method comprises the steps that after a titanium material workpiece is subjected to oil removal and activation treatment, oxygen is isolated through a protection channel containing inert gas, subsequent carburization and nickel plating treatment are conducted in sequence, and a nickel plating solution comprises nickel sulfate, nickel chloride, boric acid and water. The surface oxidation rate of the activated titanium material is delayed in the inert atmosphere, a strengthening phase is formed in the titanium material through carburizing treatment, the hardness is enhanced, the surface roughness is improved, nickel sulfate and nickel chloride are added in a nickel plating solution at the same time, the compactness of a plating layer is improved, the bonding strength of the titanium material and the nickel plating layer is integrally enhanced, and the service life of the titanium material is prolonged. And the anti-stripping capability and the wear-resisting effect of the plating layer are improved.

The utility model discloses a nickel titanium core shaft which comprises a core shaft body, the core shaft body comprises an outer core rod and an inner core shaft, a connecting seat is arranged at one end of the outer core rod, inserting grooves matched with the outer core rod in an inserting mode are formed in the outer core rod, a gradual change end and the inner middle of the connecting seat, and a locking groove is formed in the connecting seat. The core shaft body comprises an outer core rod and an inner core shaft, the inner core shaft is inserted into an inserting groove in the outer core rod, a locking pressing plate is arranged in the locking groove through a locking support, and one end of the locking support penetrates through the upper wall of the connecting base in a sliding mode and is in threaded connection with a screw outside the connecting base. When the inner core shaft is completely inserted into the outer core rod, the outer core rod with the large diameter can be used for medical operation, meanwhile, when the inner core shaft is pulled out of the outer core rod to be independently used, a small core shaft can be formed for medical operation such as puncture, the inner core shaft is partially inserted into the outer core rod, and a core shaft with the two ends different in diameter can be formed for use. And the use flexibility of the mandrel is improved.

The invention relates to a titanium alloy and nickel-titanium alloy multi-material laser directional energy deposition preparation method, which comprises the following steps of: sequentially depositing a Ti6Al4V, a Mo intermediate layer and a NiTi layer on a titanium alloy substrate by utilizing a laser directional energy deposition process, and introducing the intermediate layer capable of blocking the diffusion of Ti and Ni elements between the Ti6Al4V and the NiTi layer to inhibit the precipitation of a TC4 and NiTi interface brittle phase so as to obtain the titanium alloy and nickel-titanium alloy multi-material. Therefore, harmful cracks caused by mismatching of thermophysical properties can be effectively avoided, and a Ti6Al4V-NiTi multi-material structure with good interface bonding is obtained. Wherein the Mo middle layer is deposited through Mo particles modified by La2O3 and CeO2 nano particles, so that the defects of pores and unmelted particles during deposition of a pure Mo middle layer are further overcome, and the tensile strength and the ductility of the component are improved.