431 results about "Titanium nickelide" patented technology

The present invention relates to a flexible continuum joint, a flexible robotic arm, and a minimally invasive surgical robot for TEM. The flexible continuum joint comprises a double-helix structure formed by two helical springs, wherein a central channel is provided inside the double-helix structure, a hollow tube arranged coaxially with the double-helix structure is provided in the central channel, and a plurality of notches are formed on the hollow tube. The flexible robotic arm is composed of a linkage joint formed by an active section and a passive section, and an end joint, wherein the active section and the end joint are both driven by a drive wire, and the passive section is driven by a nickel-titanium alloy rod. The minimally invasive surgical robot comprises an endoscopic arm and two robotic arms, and has 19 degrees of freedom overall. In addition, the provision of the linkage joint in the flexible robotic arm and the application of a hybrid drive mode combining a drive wire and a nickel-titanium alloy rod not only reduces the number of drives, but also avoids the problem of motion coupling between joints, thus effectively overcoming the problems of insufficient degrees of freedom and poor motion accuracy in existing minimally invasive surgical robots for TEM.

The invention belongs to the technical field of medical instruments, and particularly relates to a spinal epidural ventral side double-wing-shaped stimulation electrode and motion function reconstruction system, the spinal epidural ventral side double-wing-shaped stimulation electrode and motion function reconstruction system comprises two wing panels, each wing panel comprises a flexible substrate, the flexible substrate is provided with two bifurcated preset-curvature double-wing structures; the electrode contact array is integrated on the flexible polar plate through a bonding pad; according to the double-wing-shaped flexible substrate, through a double-wing structure with a preset curvature, after being unfolded under the driving of a nickel-titanium alloy framework, the double-wing-shaped flexible substrate accurately covers a spinal cord ventral side and double-side anterior angle motor neuron pool, and the problem that a traditional single-piece / rod-shaped electrode can only cover a back side sensing area and cannot cover a back side sensing area is solved. The ventral motor neuron group cannot be directly activated; a stimulation target spot is transferred to a ventral functional core area from a dorsal non-target area for the first time, and the anatomical suitability bottleneck of motor function reconstruction is solved.

The invention discloses a preparation method of a bionic nickel-titanium-magnesium heterostructure as a medical implant, and relates to the technical field of medical implants.The preparation method comprises the following steps that firstly, a bionic nickel-titanium monomer structure model is established based on 3D modeling software, the designed bionic nickel-titanium monomer structure model is arrayed twice in the x-axis direction, the y-axis direction and the z-axis direction, and the bionic nickel-titanium monomer structure model is obtained; secondly, the bionic nickel-titanium structure model designed in the first step is converted into an stl format file, the stl format file is imported into magics software, and nickel-titanium alloy powder is printed into a bionic nickel-titanium structure based on the selective laser melting technology; 3, the bionic nickel-titanium structure is subjected to polishing treatment with a chemical polishing solution and then subjected to ultrasonic treatment under alcohol soaking, powder adhering to the surface is removed, the bionic nickel-titanium structure is combined with molten magnesium through a non-pressure permeation method, and a bionic nickel-titanium-magnesium heterostructure is prepared; and step 4, implanting the bionic nickel titanium-magnesium heterostructure into the bone defect.

A shape memory actuator including: a nickel-titanium (NiTi) alloy; and a ternary element provided to the nickel-titanium alloy such that the content of the ternary element in the alloy is selected and processed based on a predetermined operating temperature for the actuator. The ternary element may be selected from at least one of lead (Pd), Gold (Au), Platinum (Pt), Hafnium (Hf) and Zirconium (Zr). A method of making a shape memory alloy (SMA) actuator, the method including: preparing an SMA material; cutting the SMA material into the shape for the actuator; and processing a predetermined portion of the actuator via laser processing such that at least some material properties of the SMA material are altered to provide an altered transformation temperature. In some cases, the processing may be configured to adjust the relative amount of at least a ternary element in the predetermined portion.

The invention provides a unit cell structure design method and device based on nickel-titanium shape memory alloy, and relates to the technical field of intelligent materials and structures.The method includes the steps that relevant characteristic parameters of nickel-titanium alloy are collected, a mechanical property index, a thermal stability index and a reliability index are generated, and then a phase change temperature index is obtained through comprehensive calculation; and the phase change temperature threshold is corrected, the geometrical shape and the bonding mode of the unit cell structure are determined, and the quasi-zero-stiffness curved beam, the supporting frame and the connecting part of the unit cell structure are optimally designed in combination with the corrected phase change temperature threshold. According to the method, through characteristic parameter pretreatment, mechanical property index calculation and unit cell structure geometric optimization of the nickel-titanium shape memory alloy, the excellent performance under different phase change states is achieved, and the buffering energy absorption and low-frequency vibration isolation functions of the alloy are improved.

The invention relates to the technical field of medical instruments, and discloses a composite micro guide wire and a manufacturing method thereof.The inner core body of the micro guide wire is formed by stainless steel (or novel stainless steel)-nickel titanium in a composite mode, and an inner core comprises a conveying section (supporting section), a transition section (transition section) and a head end soft section which are arranged in sequence; a platinum core nickel-titanium alloy wire is tightly wound on the head end soft section, the inner core and the outer layer of the platinum core nickel-titanium alloy wire are integrally wrapped by TPU, the surface of the near section of the TPU layer is coated with a hydrophobic coating, and the surface of the far section of the TPU layer is coated with a hydrophilic coating. The micro guide wire is manufactured through the following steps of material preparation, inner core positioning, contact part compounding, platinum core nickel-titanium alloy wire winding and fixing, TPU coating and coating. The surface of the micro guide wire is smooth, the performance of the transition section is good, the head end is soft, the soft section of the head end is tightly wound by the platinum core nickel-titanium alloy wire, and an ideal developing effect is achieved.

The invention relates to an aneurysm embolism device, comprising: a connecting wire comprising a flexible section, an embolism section and a shaping section; the flexible section is located at the end, close to the far end, of the connecting wire, the shaping section is located at the end, close to the near end, of the connecting wire, and the embolism section is located between the flexible section and the shaping section. The connecting wire is made of a nickel-titanium alloy material; the guide spring is arranged on the flexible section in a sleeving manner and is connected with the connecting wire; the end, close to the far end, of the guide spring is a hemispherical end. The developing wire is wound on the plug section; the plurality of fiber pieces are arranged on the developing wire and are sequentially arranged at intervals along the length direction of the connecting wire; the closed spring is arranged on the shaping section in a sleeving manner; the first limiting ball is arranged on the shaping section of the connecting wire and located at the end, close to the near end, of the closed spring. The structure occupies a small space in the lumen of the micro-catheter in a compressed state, and even if a fiber piece is arranged on the developing wire, the aneurysm embolization device can still be transported in the micro-catheter conveniently. The invention also relates to a conveying system.

The invention relates to a nickel-titanium alloy buffering and energy-absorbing lattice structure and a preparation method thereof.The nickel-titanium alloy buffering and energy-absorbing lattice structure comprises a plurality of unit cells which are arranged in three directions perpendicular to one another in a three-dimensional space, and the number of the unit cells in the three directions is the same; each unit cell is a body-centered cube and comprises eight spiral supporting columns. Each unit cell is composed of a nickel-titanium shape memory alloy, the atomic percent of the Ni element in the nickel-titanium shape memory alloy is 50.0%-50.6%, and the balance is Ti atoms. According to the scheme provided by the invention, the concentration of stress and strain can be effectively relieved through the twisting and mutual supporting effects of the spiral supporting columns, the formation and expansion of a shear band are inhibited, and the repeated energy absorption capacity and damage tolerance of the nickel-titanium alloy lattice structure are improved.

The present invention relates to a flexible robotic arm based on the coupling of memory alloy and pneumatic artificial muscle, wherein the flexible robotic arm comprises a fixed disk, a spacer disk, an airbag, a center rod, a base and an air supply pipe. The fixed disk is a circular thin disk, which is installed at the end of the flexible robotic arm and is used to fix other components. The spacer disk is also a circular thin disk, which plays a supporting role in the middle of the flexible robotic arm. The airbag is a silicone thin shell structure, which provides power for the movement of the flexible robotic arm. The center rod material is nickel-titanium alloy, which has shape memory function, and the stiffness is enhanced after heating, thereby improving the stability of the flexible robotic arm. The base is a circular disk, which is used to fix other components and connect other control devices or power sources. The air supply pipe is rubber soft, which provides power by supplying air to the airbag. The present invention realizes the movement and stiffness change of the flexible robotic arm, reduces vibration and improves stability through the cooperation of the airbag and the shape memory alloy center rod.

The invention relates to the technical field of medical instruments, discloses a surgical instrument, and particularly relates to a shapeable surgical instrument suitable for single-port endoscopic surgery, which comprises an inner rod assembly, an outer rod assembly and a handle assembly. The outer rod assembly is made of annealed metal (such as pure copper or copper alloy), can be shaped by hands and is kept in a bent form; the inner rod is a nickel-titanium alloy multifilament or a stranded rope, and low-resistance rotation in a bending state is achieved. The handle rotating wheel drives the inner rod to rotate and is matched with the axial push-pull of the rear handle, so that the 360-degree real-time angle adjustment and opening and closing actions of the working part (forceps piece / scissors) are controlled by a single hand, and the forceps piece / scissors do not need to be taken out of a body. The problems that a traditional straight rod instrument cannot reach a narrow area, a pre-bending instrument cannot be adjusted in an operation, and an existing shaping instrument needs in-vitro angle adjustment of two hands are solved, the operation efficiency is improved, and the cleaning and sterilizing time is shortened.

The invention relates to the technical field of medical nickel-titanium materials, in particular to a trace multi-element doped medical nickel-titanium alloy tube and a preparation method thereof.The trace multi-element doped medical nickel-titanium alloy tube comprises a nickel-titanium alloy tube body, and the nickel-titanium alloy tube body comprises 54.5 wt%-57.0 wt% of Ni, 42.8 wt%-45.3 wt% of Ti, an element for improving biocompatibility and fatigue resistance, a reinforcing and toughening element, an antioxidant element and an antibacterial element; the preparation method comprises the following steps: pretreating metal particles, accurately weighing, uniformly mixing, smelting and annealing to obtain a nickel-titanium tube blank; performing linear cutting to form an inner hole; the nickel-titanium tube blank is processed to the outer diameter of 4-6 mm through hot rolling and first-stage intermediate annealing, and then the nickel-titanium tube blank is processed to the outer diameter of 0.17-0.32 mm through cold drawing and second-stage intermediate annealing; and performing heat treatment and surface treatment. The obtained product has good mechanical properties and biocompatibility, the preparation method provided by the invention can control the microstructure of the product, and the product performance difference is small.

The invention relates to a micro-miniature large-length-diameter-ratio continuum mechanical arm based on a rigid-flexible composite joint and a modeling method thereof.The micro-miniature large-length-diameter-ratio continuum mechanical arm comprises an operation arm, the operation arm comprises a plurality of continuum sections which are sequentially connected in series, each continuum section comprises a plurality of connecting rod sections and a plurality of universal joint sections, and the micro-miniature large-length-diameter-ratio continuum mechanical arm further comprises a nickel-titanium alloy pipe; the nickel-titanium alloy pipe penetrates through the middle parts of the plurality of continuous body sections which are sequentially connected in series; and the driving box is used for providing power for the operation arm and achieving accurate motion control, and the operation arm is connected with the bottom of the operation arm. The novel rigid-flexible composite joint is introduced, composition of the rigid joint and the continuum flexible mechanical arm is achieved, rigid support is provided for the continuum flexible mechanical arm under the condition that movement is not affected, the rigidity, compression resistance and torsion resistance of the mechanical arm are effectively improved, and the load capacity and movement stability of the mechanical arm are enhanced.

The utility model belongs to the technical field of nitration reaction equipment, and particularly relates to a nitration reaction device which comprises a tank body, a heat energy conversion mechanism is arranged at the top end of a base, a driving disc is rotationally arranged on one side of a fixed block through a rotating rod, a V-shaped groove is formed in the circumferential surface of the driving disc, and a fixed block is arranged in the V-shaped groove. Two sets of supporting plates are fixedly arranged at the top end of the base in a mirror image mode, rotating shafts are arranged at the tops of the supporting plates in a rotating and penetrating mode through bearings, driven discs are fixedly arranged on the opposite faces of the two sets of rotating shafts, V-shaped grooves are formed in the circumferential faces of the driven discs, and a direct-current generator is fixedly arranged on one side of each supporting plate through a fixing frame. The two driving discs and the two driven discs are sleeved with nickel-titanium alloy coils in a transmission mode, heat generated by cooling water with the temperature increased after use is converted into kinetic energy and then converted into electric energy through cooperation of the heat energy conversion mechanism, the energy consumption of equipment is reduced, and meanwhile the cost of a production enterprise is reduced.

The invention relates to the technical field of pipeline dredging and plant medullary core taking-out, and discloses a self-adaptive pipeline dredging and plant medullary core taking-out device which comprises a rod body. The first sleeve seat is sleeved on the rod body in a sliding manner; the second sleeve seat is arranged on one side of the first sleeve seat and sleeves the rod body; the end part is fixedly installed at one end of the rod body through a bolt, a plurality of sets of first supporting rods distributed at equal intervals are hinged to the end part through a hinge shaft, the device is matched with a tension spring through a supporting rod hinge structure, diameter self-adaptive adjustment is achieved, different pipe diameters or marrow core sizes are accurately matched, jamming and damage are avoided, and universality is improved. The nickel-titanium alloy net forms an attached working face, and the working effect is guaranteed. Manual intervention is not needed, real-time adaptation can be achieved in a narrow environment, the locking assembly is stable and reliable, automatic reset is achieved after operation, the process is simplified, efficiency is improved, and the problems that an existing tool is tedious in operation and insufficient in adaptability are solved.

The invention discloses a nickel-titanium alloy intracranial stent electrochemical polishing device and method, and relates to the technical field related to medical instruments, the nickel-titanium alloy intracranial stent electrochemical polishing device comprises a polishing workbench and a lifting table arranged on the polishing workbench, the lifting table is provided with a clamp, and the clamp is driven by the lifting table to clamp the nickel-titanium alloy intracranial stent. The clamp clamps the support to enter the polishing solution on the polishing workbench for electrochemical polishing treatment, and the clamp is made of an inert titanium material; the clamp comprises a center rod fixedly connected with the lifting table, a plurality of contact rods are evenly arranged in the circumferential direction of the center rod, and a gap is formed between every two adjacent contact rods. When electrochemical polishing is carried out on the nickel-titanium alloy intracranial stent, the stent is arranged on the outer walls of the multiple contact rods in a sleeving mode.

The invention discloses a preparation method of a bionic beetle skeleton implant, and belongs to the field of femoral implantation. The bionic structure characteristics of beetle elytra and cuticle are creatively combined, the mechanical strength and structural stability of the porous nickel-titanium alloy structure implant are effectively improved through the bionic structure design method, and the long-standing stress shielding effect problem of a traditional femoral metal implant is successfully solved; the porous nickel-titanium alloy bionic skeleton structure prepared by adopting a selective laser melting (SLM) technology not only has good mechanical suitability, avoids rejection and shedding reaction with natural bone tissues after implantation, but also can realize a complete shape memory recovery function in a room temperature environment, and has good application prospects in the field of medical orthopedic implantation.

The invention discloses a floating vapor phase growth method and device for a single-walled carbon nanotube, and application of the floating vapor phase growth method and device. The floating vapor phase growth method comprises the following steps: forming a nickel-titanium alloy catalytic core in a first channel, and forming carbon atom gas in a second channel; the nickel-titanium alloy catalyst core and the nickel-titanium alloy catalyst core meet each other and grow to form a single-walled carbon nanotube, and the nickel-titanium alloy catalyst core has a close-packed hexagonal lattice structure. The nickel-titanium alloy with a close-packed hexagonal structure is used as a catalytic core and corresponds to a six-membered ring carbon atom structure in the single-walled carbon nanotube, rapid growth of the single-walled carbon nanotube can be selectively initiated, formation of a double-walled carbon nanotube or even a multi-walled carbon nanotube is inhibited, and the catalytic performance of the single-walled carbon nanotube is improved. And finally, a single-walled carbon nanotube product with high yield, high purity and high crystallinity is obtained. Besides, carbon nanotubes with different characteristics can be formed when different carbon sources are matched, so that the proportion of metal and semiconductor in the product can be adjusted by adjusting the category of the carbon sources, and carbon nanotube products with different conductive characteristics can be obtained in a targeted manner.

The invention relates to a method for polishing the inner wall of a thick nickel-titanium alloy pipe, which comprises the following steps: firstly, carrying out ultrasonic decontamination cleaning and drying on the thick nickel-titanium alloy pipe to be polished, then putting the dried thick nickel-titanium alloy pipe to be polished into a rotary rigid grinding device, and filling a coarse-grained grinding medium and water into the thick nickel-titanium alloy pipe to be polished, the rotary rigid grinding device is started to roughly polish the thick nickel-titanium alloy pipe to be polished, then the thick nickel-titanium alloy pipe subjected to rough polishing is placed into the rotary flexible grinding device, and the rotary flexible grinding device is started to finely polish the thick nickel-titanium alloy pipe to be polished through the polishing solution; and finally, the nickel-titanium alloy thick pipe subjected to fine polishing is subjected to ultrasonic water cleaning and drying. The rough polishing mode of the rotary rigid grinding device and the fine polishing mode of the rotary flexible grinding device are combined to achieve automatic polishing, the inner wall defects of the nickel-titanium alloy thick pipe can be effectively removed, the surface roughness of the inner wall is reduced, and the smoothness and the polishing efficiency are improved.

The invention relates to a shape memory wide nickel-titanium alloy plate and a preparation method thereof, and the preparation method comprises the following steps: mixing and smelting alloy raw materials to prepare a nickel-titanium cast ingot, and homogenizing the nickel-titanium cast ingot; cutting off a dead head of the nickel-titanium cast ingot and then slitting the nickel-titanium cast ingot into a to-be-forged ingot blank; the ingot blank is subjected to a composite forging process combining high-frequency forging and low-frequency forging, and the accumulative deformation is 90% or above; a hot-rolled plate blank is obtained through two-stage hot rolling, and first-stage blooming at the temperature of 750-900 DEG C and second-stage finish rolling at the temperature of 700-850 DEG C are included; performing cold rolling on the hot-rolled plate blank to obtain a cold-rolled plate blank; and the cold-rolled plate blank is subjected to heat treatment strengthening, and the shape memory wide nickel-titanium alloy plate with the width being 600 mm or above is obtained. According to the wide nickel-titanium alloy plate prepared through the method, the thickness ranges from 0.3 mm to 3.0 mm, the yield strength is 450 Mpa or above, the tensile strength is 850 Mpa or above, the ductility is 20% or above, and the shape recovery rate is 90% or above.

The invention provides a preparation method for improving the thermoelastic refrigeration performance of a nickel-titanium alloy, which breaks through the traditional cold processing technology and precipitation strengthening technology, and adopts a specific preparation method comprising annealing treatment, strong plastic deformation process, re-annealing, cyclic stretching and aging. The coarse-grain nickel-titanium shape memory alloy containing uniformly-distributed and high-density nano precipitated phases is prepared, the refrigeration efficiency and refrigeration capacity of the material can be considered, meanwhile, energy dissipation in the phase change process is reduced, the service life is prolonged, and the mechanical property stability is improved. In addition, the process is simple to operate, relatively high in precision and low in cost, can be quickly produced and put into use, and has a wide application prospect.

The invention discloses a bionic automobile passive energy absorption device based on nickel-titanium alloy, and relates to the technical field of automobile passive safety, the bionic automobile passive energy absorption device comprises an anti-collision beam main body, two energy absorption boxes are fixedly arranged on one side of the anti-collision beam main body, the energy absorption boxes are filled with bionic energy absorption inner cores, the anti-collision beam main body, the energy absorption boxes and the bionic energy absorption inner cores are made of nickel-titanium alloy, and the anti-collision beam main body, the energy absorption boxes and the bionic energy absorption inner cores are made of nickel-titanium alloy. And all the components are integrally printed and formed in an additive manufacturing mode. The differential bionic lattice structures of the anti-collision beam body and the energy absorption boxes form a collaborative energy absorption system, and the whole process optimization of gradient buffering of collision loads, layered dissipation of energy and precise deformation control is achieved. The anti-collision beam body buffers instantaneous load at the initial stage of collision, peak load is reduced, stable conditions are created for follow-up energy absorption of the energy absorption box, the anti-collision beam body dissipates collision energy, and residual energy is further dissipated in a layered mode through the bionic lattice structure of the energy absorption box.

The invention discloses a preparation method of an ultra-pure nickel-titanium alloy thin-wall pipe for a heart valve. The method comprises the following steps: 1, preparing materials, and carrying out magnetic suspension induction melting to obtain a cast ingot; 2, gradually performing hot forging and rolling on the cast ingot to obtain a round bar; thirdly, the round bar is manufactured into a pipe blank, honing and polishing are conducted, and the nickel-titanium pipe is obtained; 4, assembling the nickel-titanium pipe into the titanium pipe to obtain a combined pipe; 5, heat treatment of the combined pipe; 6, three-roller precise cold rolling; 7, repeating to obtain a pipe semi-finished product; and 8, straightening and cylindrical grinding are performed to remove the titanium pipe. According to the method, the high-purity nickel-titanium alloy cast ingot is prepared through magnetic suspension induction melting, the outer-layer titanium pipe and the inner-layer nickel-titanium pipe are introduced to be assembled, the pass deformation is increased through the restraining and protecting effects of the titanium pipes, the number of times of rolling and heat treatment is reduced, and the machining period is shortened; the obtained ultra-pure nickel-titanium alloy thin-wall pipe is high in purity, high in size precision, good in surface quality, high in wall thickness uniformity and good in comprehensive mechanical property and is suitable for the field of heart valves.

The invention discloses a preparation method of a bionic vibration reduction structure of an aircraft wing leading edge, relates to the technical field of aircraft wings, and completes establishment of a bionic kangaroo jumping structure, a bionic origami honeycomb structure and a bionic woodpecker spiral structure based on three-dimensional modeling software. A bionic kangaroo jumping structure, a bionic origami honeycomb structure and a bionic woodpecker spiral structure are regionally filled into a traditional aircraft wing entity model in Magics software, and based on a laser powder bed melting technology, nickel-titanium alloy powder is used for printing and forming the filled traditional aircraft wing entity model; and preparing a PU-MXene mixed solution, and plating the PU-MXene mixed solution on the surface of the printed and formed solid model of the wing of the traditional aircraft through an electrochemical deposition method. The effects of damping the leading edge of the aircraft wing, improving the rigidity, absorbing sound, reducing noise and being super-hydrophobic are achieved.

The invention discloses intelligent oil and gas field automatic well selection and flow dynamic measurement integrated equipment, and relates to the technical field of flow measurement. A protection mechanism and a flow detection mechanism are movably arranged at the bottom of the launching mechanism, a wellhead is rapidly positioned through a visual sensor, traditional manual aiming is replaced, the positioning error is reduced, the single well deployment time is shortened, a hollow electric telescopic rod is used for supporting a detection cavity to be switched among a high-altitude hovering mode, a near-well contact mode and a deep liquid level mode, and the detection efficiency is improved. The integrated sensor group can be effectively mounted on a pipe wall through a triangular stable positioning structure formed by three groups of connecting rod structures and a magnetic guide rail, multi-parameter detection is performed on fluid in a well in real time, when the nickel-titanium alloy variable pipe is heated, a straight pipe is transformed into a spiral pipe, the change rate of the sectional area of a flow channel is increased, and the detection accuracy is improved. The mixing efficiency of the tracer agent is improved, and the measurement error of the slug flow is reduced.

The invention discloses a nickel-titanium alloy reinforced nano silicon carbide composite ceramic material and a preparation process, and relates to the field of silicon carbide composite ceramic materials, the nickel-titanium alloy reinforced nano silicon carbide composite ceramic material comprises the following raw materials by weight: 75-85 parts of silicon carbide powder, 2.3-2.5 parts of carbon nanotubes, 0.8-1.2 parts of boron carbide, 10-12 parts of a nano nickel-titanium-based resin binder, 0.08-0.1 part of polyethylene glycol, and 25-30 parts of water. The synthesized nano nickel-titanium-based resin binder is a polyacrylate binder obtained by carrying out polymerization reaction on a double-bond product containing terminal carbon-carbon double bonds, nano cerium oxide, nano nickel-titanium alloy and epoxy groups, has the effects of promoting sinterability, corrosion resistance and enhancing mechanical strength, achieves the purpose of one agent with multiple purposes, and is worthy of popularization and application.

The invention discloses a nickel-titanium alloy material and a preparation method and application thereof. The nickel-titanium alloy material comprises a nickel-titanium alloy body and a TiN-containing coating arranged on the surface of the body, wherein the coating is prepared by adopting a high-power pulse magnetron sputtering technology. The TiN-containing coating in the nickel-titanium alloy material is prepared through the HiPIMS technology, the obtained coating material has the remarkable characteristic of high compactness, and when the coating material is used for an implant material, the nickel element precipitation prevention effect is good. Meanwhile, the nickel-titanium alloy material has the advantages of high corrosion resistance, high binding force, low stress and the like, can be used in (non) implantable medical devices with high corrosion resistance and high compact protection requirements, and is good in application prospect.

The application discloses a segmented phase controlled root canal file and a preparation method thereof. The preparation method comprises the following steps: S1, precisely forming a root canal file blank by a nickel-titanium alloy grinding machine; S2, coarsely adjusting a phase ratio by a first vacuum heat treatment; S3, finely adjusting segmented phases by a second vacuum heat treatment; S4, locally quenching a rod part by high frequency; S5, removing defects by integral electrolytic polishing; and S6, multi-path tempering, including natural color, golden color and blue color grading. By means of the double vacuum segmented heat treatment for precisely controlling the phase ratio of the base body and the local quenching of the rod part, the working section can keep high flexibility, the rod part can obtain high hardness and super elasticity, and the core contradiction that the softness and the hardness cannot be considered simultaneously in the integral heat treatment can be solved at one time; after the local quenching, the electrolytic polishing process is arranged, so that the quenching oxide skin and intergranular microcracks can be completely removed, the surface roughness can be reduced, and the initiation source of fatigue cracks can be eliminated.

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 invention discloses a stealth coating material for aviation aircrafts. According to the invention, a three-layer composite structure design is adopted; the intelligent sensing layer is composed of graphene quantum dots and a piezoelectric nanofiber composite network, so that real-time sensing of electromagnetic wave signals is realized; the tunable metamaterial layer comprises a liquid crystal elastomer matrix and nickel-titanium alloy nanowires dispersed in the liquid crystal elastomer matrix, and electromagnetic parameters of the material are dynamically adjusted by applying an electric field or a temperature field; vanadium dioxide nanoparticles, a photonic crystal structure and carbon nanotube aerogel are integrated in the multispectral stealth layer, and radar, infrared and visible light multispectral synergistic stealth is achieved. The coating is further integrated with a microencapsulation repairing agent and an intelligent control system, and has the self-repairing and self-adaptive adjusting functions. Compared with the prior art, 0.1-40 GHz ultra-wide frequency band radar wave absorption is achieved, the radar cross section is reduced by 25-30 dB, the infrared radiation characteristic is reduced by 80% or above, the surface density is only 1.2-1.5 kg / m, the weight is reduced by 65% compared with a traditional coating, and a key material technical support is provided for a new generation of stealth aircrafts.

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.