CN117226118B - Additive manufacturing method of zirconium-niobium alloy implant - Google Patents
Additive manufacturing method of zirconium-niobium alloy implant Download PDFInfo
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- CN117226118B CN117226118B CN202311520787.XA CN202311520787A CN117226118B CN 117226118 B CN117226118 B CN 117226118B CN 202311520787 A CN202311520787 A CN 202311520787A CN 117226118 B CN117226118 B CN 117226118B
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- GFUGMBIZUXZOAF-UHFFFAOYSA-N niobium zirconium Chemical compound [Zr].[Nb] GFUGMBIZUXZOAF-UHFFFAOYSA-N 0.000 title claims abstract description 79
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention relates to an additive manufacturing method of a zirconium-niobium alloy implant. It comprises the following steps: establishing an integral three-dimensional model of the zirconium-niobium alloy implant, and dividing the integral three-dimensional model along the shape center to the outer surface to obtain a decomposition three-dimensional model of a plurality of dividing components; the spatial relative positions of the plurality of decomposition three-dimensional models are consistent with the integral three-dimensional model; slicing the multiple decomposition three-dimensional models layer by layer along the height direction, setting melting paths for the slice by layer, and guiding slice data into the additive manufacturing equipment; and taking the plurality of dividing assemblies as a plurality of parts to be printed in the same batch, and carrying out additive manufacturing on the zirconium-niobium alloy powder by additive manufacturing equipment to obtain the zirconium-niobium alloy implant. According to the invention, the parts of the plurality of dividing assemblies are divided from the shape center to the outer surface, different melting and forming technological parameters are adopted for different parts, and zirconium-niobium alloy implants with different porosities are produced through additive manufacturing, so that the high-quality processing and manufacturing of the zirconium-niobium alloy porous implants are realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of additive manufacturing, in particular to an additive manufacturing method of a zirconium-niobium alloy implant.
Background
Trauma, inflammation, bone tumor resection can create a wide range of bone defects, and repair and reconstruction thereof has been a significant challenge for orthopedics. Biomedical metals are used as bone repair materials, and have better mechanical properties compared with high polymer materials and most ceramic materials. However, solid metallic materials have a higher modulus of elasticity than human bone, and after implantation, they can produce a stress shielding effect, causing loosening or breakage of the implant. The porous metal material manufacturing method includes casting method, vapor deposition method, powder metallurgy method, spark plasma sintering method, self-propagating high temperature synthesis method, additive manufacturing method, etc.
The porous material prepared by the casting method generally has higher porosity, but the precision of the large-size sample and the single-domain porous material prepared by the method is difficult to ensure, the mechanical property of the prepared sample is poor, and the metal powder in the slurry is difficult to uniformly disperse. The process for preparing the porous metal by the vapor deposition method has the advantages of large operation difficulty coefficient, slower deposition speed and high production cost, thereby limiting the wide application of the porous metal in the field of porous metal materials. The powder metallurgy method has the advantages of low cost, simple process and the like in the process of preparing the porous metal, but has short sintering time, and is difficult to control the solidification speed and the pore size, so that the porous structure with uniform pore size is difficult to prepare, and the porous metal part with complex shape is difficult to obtain. The porous metal material prepared by the spark plasma sintering method has the advantages of high porosity, moderate pore size and the like, but has higher cost in the process of preparing the porous metal material and must be carried out in a vacuum environment. The porous metal material prepared by the self-propagating high-temperature synthesis method has the advantages of high porosity and excellent mechanical properties, but the self-propagating high-temperature synthesis method has the advantages of high reaction speed and high temperature gradient in the reaction process, and is easy to cause the defect that the crystal lattice of the porous material generates high density. Additive manufacturing technology is an emerging manufacturing technology, and in principle, manufacturing of any complex part can be realized, so that a new accurate manufacturing method is provided for preparing porous materials.
The additive manufacturing technology can realize personalized customization of the porous metal implant according to different anatomical forms, can realize high matching with a bone defect area, can regulate and control the pore size, the form and the porosity, and can effectively reduce the elastic modulus of the implant. The porous titanium and titanium alloy obtained by additive manufacturing have higher specific strength, low elastic modulus, low density and good biocompatibility. The porous titanium and titanium alloy related standardized orthopedic implants have a plurality of products approved to be marketed, and cover different parts of maxillofacial surfaces, hip joints, knee joints, ankle joints, vertebration and the like, and the clinical application effect is exact. The tantalum metal porous prosthesis manufactured by additive can meet the performance requirement of the orthopedic implant prosthesis, is primarily applied to clinical application, and has good follow-up effect.
The zirconium alloy becomes a new generation of orthopedic implant with excellent biocompatibility, lower elastic modulus, low magnetic susceptibility and other performances, and can be used for manufacturing the orthopedic implant instead of Ti alloy. The low modulus of elasticity zirconium alloy helps to reduce stress shielding due to biomechanical incompatibility between the implant and the human bone. On the other hand, zirconium alloys also have lower magnetic susceptibility when subjected to nuclear Magnetic Resonance (MRI) examination of orthopaedic implant patients, which can reduce MRI imaging artifacts. Among them, zrNb alloy is the main material of medical instruments and implants because of its high strength, good toughness and biocompatibility, low magnetic susceptibility and elastic modulus. The ZrNb alloy implant surface is oxidized to form a ceramic layer (ZrO 2 A layer) whose ceramic surface is integrally formed with the entire metal prosthesis, avoiding spalling or chipping of the surface of the prosthesis; the friction coefficient of the ZrNb alloy surface after oxidation is half of that of the cobalt-chromium alloy, and the ZrNb alloy surface has better lubrication degree and corrosion resistance, so that the wear rate of a joint friction interface can be obviously reduced, and the service life of the prosthesis is prolonged;the zirconium-niobium alloy implant is integrally designed with a metal prosthesis with an oxidation interface, the strength of the zirconium-niobium alloy implant is 2 times that of the cobalt-chromium alloy, the high brittleness similar to ceramics is avoided, and the fragmentation of the prosthesis is effectively prevented; besides good mechanical properties, the zirconium-niobium alloy also has ideal biocompatibility and low sensitization, and is more suitable for patients with allergic constitution.
The adoption of the current advanced Additive Manufacturing (AM) processing technology is beneficial to better realizing the efficient forming of the zirconium-niobium alloy porous implant. AM has great advantages in the manufacture of a complete set of human bones with bone trabecular structures or surfaces that promote cell growth and biological osseointegration. The AM technology uses high energy beam as energy source, under vacuum protection, high speed scanning and heating metal powder, and three-dimensional complex structural member is manufactured by melting and superposition forming layer by layer.
At present, the implant for zirconium-niobium alloy is processed by a forging method, and the forging method mainly adopts a pre-forged zirconium alloy forging piece, blank, bar stock or other pre-forging materials to replace a forging bar material traditionally used for forging raw materials, the pre-forging piece has required toughness and a forgeable fine grain structure, the forging method can reduce the manufacturing time by carrying out secondary forging on the pre-forging piece, and the method for refining grains of the pre-forging piece and improving the ductility is provided.
And a specific die or a fixture is not needed in the process of preparing the metal porous material by using the 3D printing (additive manufacturing) technology, so that the processing period is short. The powder can be recycled, the material utilization is high, and the manufacturing cost is saved. Personalized customization can be realized, and the requirements of different patients are met. The porosity, pore structure and the like of the porous part can be accurately controlled, and the control of mechanical properties is realized.
Regarding the above technical solution, the inventors found that at least some of the following technical problems exist:
the existing additive manufacturing technology is mainly designed aiming at the components of the zirconium-niobium alloy material, and does not mention how to improve the processing quality of the zirconium-niobium alloy porous implant, so that the high-quality processing and manufacturing of the zirconium-niobium alloy porous implant are realized.
Accordingly, there is a need to improve one or more problems in the related art as described above.
It is noted that this section is intended to provide a background or context for the technical solutions of the invention set forth in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Disclosure of Invention
The present invention is directed to a method of additive manufacturing of a zirconium niobium alloy implant that, at least in part, addresses one or more of the problems set forth above as a result of the limitations and disadvantages of the related art.
The invention provides an additive manufacturing method of a zirconium-niobium alloy implant, which comprises the following steps:
establishing an integral three-dimensional model of the zirconium-niobium alloy implant, wherein the integral three-dimensional model is segmented from the shape center to the outer surface to obtain a decomposed three-dimensional model of a plurality of segmentation components; wherein the spatial relative positions of the plurality of decomposed three-dimensional models are consistent with the integral three-dimensional model;
slicing the plurality of decomposed three-dimensional models layer by layer along the height direction, setting melting paths for the slice by layer, and guiding slice data into the additive manufacturing equipment;
and taking the plurality of dividing assemblies as a plurality of parts to be printed in the same batch, and carrying out additive manufacturing on the zirconium-niobium alloy powder by additive manufacturing equipment to obtain the zirconium-niobium alloy implant.
Optionally, the step of establishing a monolithic three-dimensional model of the zirconium niobium alloy implant, where the monolithic three-dimensional model is segmented from a shape center to an outer surface to obtain a decomposed three-dimensional model of a plurality of segmentation components further includes:
among the decomposed three-dimensional models of the plurality of segmentation components, the decomposed three-dimensional models of adjacent segmentation components extend at the joint and form an overlap.
Optionally, the overlapping length of the overlapping part is greater than or equal to 0.05mm.
Optionally, the monolithic three-dimensional model of the zirconium niobium alloy implant has a porous structure provided with at least one of the following features: the porosity is 30% -90%, the wire diameter is 50-500 μm, and the pore size is 150-900 μm.
Optionally, the maximum lengths of the plurality of dividing components are all less than or equal to 10mm, and the lengths of the dividing components are the lengths from the nearest point to the farthest point of the dividing components from the shape center in the same vector pointing to the shape center.
Optionally, the thickness of the layer-by-layer slice is greater than or equal to 0.03mm and less than or equal to 0.1mm.
Optionally, the step of using the plurality of dividing assemblies as a plurality of parts to be printed in the same batch and performing additive manufacturing on the zirconium-niobium alloy powder by using an additive manufacturing device to obtain the zirconium-niobium alloy implant further includes:
by adjusting the melt forming process parameters of the plurality of parts, the porosity of the segmented component near the center is made smaller.
Optionally, the step of making the porosity of the split assembly closer to the center smaller by adjusting the melt forming process parameters of the plurality of parts further includes:
the parts are sequentially marked as A1-An along the outward direction of the center, the corresponding porosity of each part is respectively K1-Kn, the size relation of the porosities of the parts is K1-K2-Kn, kn is 70-90%, and n is a natural number greater than or equal to 2.
Optionally, the melt forming process parameters include: the melting energy density is 100-1700J/m, the scanning current is 2.0-6.0 mA, and the scanning speed is 0.2-1.5 m/s.
Optionally, the method includes using a plurality of dividing assemblies as a plurality of parts to be printed in the same batch, performing additive manufacturing on zirconium-niobium alloy powder by using an additive manufacturing device, and after obtaining the zirconium-niobium alloy implant, further includes:
and cleaning and in-situ oxidizing the obtained zirconium-niobium alloy implant.
The technical scheme provided by the invention can comprise the following beneficial effects:
in the invention, the parts of the plurality of dividing assemblies are divided from the shape center to the outer surface, and different parts can adopt different fusion forming technological parameters, so that the zirconium-niobium alloy implant with different layering porosities is produced through additive manufacturing, and the high-quality processing and manufacturing of the zirconium-niobium alloy porous implant are realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 illustrates a flow diagram of a method of additive manufacturing of a zirconium niobium alloy implant in an exemplary embodiment of the present invention;
FIG. 2 shows a schematic representation of a three-dimensional model of a zirconium niobium alloy implant in an exemplary embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the manner in which adjacent segmentation assemblies are connected in an exemplary embodiment of the present invention;
FIG. 4 shows a segmentation schematic of a porous model in an exemplary embodiment of the invention;
fig. 5 shows a flow diagram of a method of additive manufacturing of zirconium niobium alloy implant with an oxidation process in an exemplary embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of embodiments of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.
The invention provides an additive manufacturing method of a zirconium niobium alloy implant, which is shown with reference to fig. 1 and comprises the following steps:
step S101: and establishing an integral three-dimensional model of the zirconium-niobium alloy implant, and dividing the integral three-dimensional model along the shape center to the outer surface to obtain a decomposition three-dimensional model of a plurality of dividing components.
Step S102: slicing the plurality of decomposed three-dimensional models layer by layer along the height direction, setting a melting path for the slice by layer, and guiding slice data into the additive manufacturing equipment.
Step S103: and taking the plurality of dividing assemblies as a plurality of parts to be printed in the same batch, and carrying out additive manufacturing on the zirconium-niobium alloy powder by additive manufacturing equipment to obtain the zirconium-niobium alloy implant.
In step S101, the spatial relative positions of the plurality of decomposed three-dimensional models are matched with the entire three-dimensional model.
It should be understood that zirconium niobium alloy implants are also referred to as zirconium niobium alloy porous implants. The zirconium-niobium alloy implant can be biological implants such as a spinal fusion device, a tibia cushion block, a bone supplementing block, a bone nail, a personalized implant and the like. The material has the advantages of good compression performance, tensile performance, low elastic modulus, no nuclear magnetic resonance artifact and the like, has the advantages of good wear resistance, corrosion resistance, biocompatibility and the like, can replace the existing titanium and titanium alloy porous, tantalum metal porous, ceramic porous and other materials, and becomes a permanent implant for a human body.
It is further understood that the method comprises the steps of model design, model discretization treatment, additive manufacturing process, surface ceramic treatment and the like, wherein the three-dimensional model optimization design and additive manufacturing process optimization adjustment are performed aiming at the high mechanical property requirement and the induced bone ingrowth requirement of the zirconium-niobium alloy implant, and the final forming of the zirconium-niobium porous part is realized through layer-by-layer fusion forming, so that the suitability of the zirconium-niobium alloy porous part at an implantation position can be improved.
It is also to be understood that the additive manufacturing model design is specially designed, the original model is subjected to segmentation treatment under the condition that parameters such as the inherent pore structure, the unit cell size and the topological structure of the model are not changed, the segmented porous structure maintains the original shape characteristics, and the manufacturing method is simple. Meanwhile, no support is needed to be added when the model is designed.
It should be further understood that, referring to fig. 2, printing and forming are performed on different areas after being divided by adopting different processes, so that printing with different wire diameters, pore diameters and porosities under different processes can be realized, and by combining printing and forming, not only can the mechanical properties of the zirconium-niobium porous part, such as compressive strength, elastic modulus, fatigue performance and the like be improved, but also the bone ingrowth induction capability of the zirconium-niobium porous part can be enhanced.
It should also be understood that the model slicing software is utilized to slice the zirconium-niobium alloy implant model layer by layer along the placement height direction, the melting path is set according to the sequence of the design of the porous implant model, and the slice data is imported into the control unit of the forming equipment to set the related forming process parameters.
It should also be appreciated that the various components of the various segmented components of the zirconium niobium alloy implant are formed by additive manufacturing of different melting processes in a sequence and the resulting zirconium niobium alloy implant may be understood as a blank and may be further cleaned and oxidized.
It should be further understood that the specific process of additive manufacturing of the zirconium niobium alloy powder using the additive manufacturing apparatus in step S103:
1) Heating a bottom plate: the high energy beam is used to heat the bottom plate of the shaped zirconium niobium alloy implant.
2) Powder laying: the zirconium-niobium alloy powder is pushed out from the powder container and uniformly laid on the heated forming bottom plate, and the powder laying height is the same as the thickness data of the discretization treatment.
3) Powder heating: and heating or sintering the laid zirconium-niobium alloy powder by adopting a high-energy heat source moving at a high speed.
4) Zone melting: the control unit melts the heated powder according to the slice data using a heat source that is a focused high energy beam.
5) The process is repeated: repeating the powder lay-up, powder heating and zone melting processes can result in a high quality zirconium niobium alloy porous implant, wherein the zone melting of the zirconium niobium alloy porous implant is performed according to discrete paths.
It should also be understood that, more specifically, the high energy beam scanning current is controlled to be 12 mA-29 mA by the heating of the bottom plate, the scanning speed is controlled to be 13-25 m/s, and the heating process is controlled to be 45-59 min. Carrying out high-energy beam bombardment heating on the powder on the whole substrate after the powder is paved, wherein the high-energy beam bombardment heating current is 31-37 mA, the bombardment heating speed is 15-20 m/s, and the bombardment heating time is controlled to be 12-20 s; the high energy beam bombarding scanning interval is 0.8 mm-1.5 mm.
By adopting the additive manufacturing method of the zirconium-niobium alloy implant, the parts of the plurality of dividing assemblies are divided from the center of the shape to the outer surface, and different parts can adopt different melt forming process parameters, so that the zirconium-niobium alloy implant with different layering porosities is produced through additive manufacturing, and the high-quality processing and manufacturing of the zirconium-niobium alloy porous implant are realized.
Next, each step of the above-described calibration method in the present exemplary embodiment will be described in more detail with reference to fig. 1 to 5.
In some embodiments, referring to fig. 3, step S101 further includes:
step S201: among the decomposed three-dimensional models of the plurality of divided components, the decomposed three-dimensional models of adjacent divided components extend at the joint and form an overlap.
It is to be understood that the three-dimensional model of the zirconium-niobium alloy implant is established by using 3D modeling software, and the porous three-dimensional model of the zirconium-niobium alloy implant is segmented and connected. And (3) carrying out center segmentation on the porous model in the three-dimensional model, so that the model is segmented layer by layer from the center to the outer edge. And connecting the divided adjacent porous connecting parts in a lap joint mode. The optimal adjustment of the next printing process can be realized through the segmentation and reconnection design, and the connection defect or the mechanical property deterioration caused by the segmentation is reduced. The connection mode between the partition areas can be connected in a lap joint mode, so that the problem of performance deterioration caused by connection defects is solved.
In some embodiments, referring to the illustration in fig. 3, the overlap at the overlap is greater than or equal to 0.05mm in length.
It is to be understood that the connection mode between the divided parts is a repeated connection method, and the overlapping length t is more than or equal to 0.05mm. By adopting special model treatment, different areas of the zirconium-niobium alloy porous material can be melted by adopting different processes, and finally the gradual change effect of porosity, aperture and wire diameter is realized, so that the compression strength, elastic modulus, fatigue performance and the like of the zirconium-niobium alloy implant are improved, and the bone ingrowth capacity of the zirconium-niobium porous implant is also improved.
In some embodiments, referring to fig. 2, step S101 further includes:
the monolithic three-dimensional model of the zirconium niobium alloy implant has a porous structure provided with at least one of the following features: the porosity is 30% -90%, the wire diameter is 50-500 μm, and the pore size is 150-900 μm.
It is understood that the porous structure design of the zirconium niobium alloy implant may vary from center to outside layer by layer, for example, from 30% of the centermost porosity to 90% of the outermost porosity. Likewise, the wire diameter size and pore size may also vary from the center to the outside layer by layer.
In some embodiments, referring to fig. 4, step S101 further includes:
the maximum length of the plurality of dividing components is less than or equal to 10mm, and the length of the dividing components is the length from the nearest point to the farthest point of the dividing components from the shape center in the same vector pointing to the shape center.
It is to be understood that the cutting mode of the cutting assembly is to divide the cutting assembly into multiple layers of parts around the center of the parts, the number n of the divided parts (the cutting assembly) is more than or equal to 2, each layer of the cutting assembly is calculated according to the actual size of the parts, and the maximum length d 0-dn-1 of the parts which are divided in the center is less than or equal to 10mm.
In some embodiments, referring to fig. 4, step S102 further includes:
the thickness of the layer-by-layer slices is more than or equal to 0.03mm and less than or equal to 0.1mm.
It is understood that the slice-by-slice, i.e., discrete data, is 0.03-0.1 mm thick layer by layer. In addition, the included angle of the melting path of each layer can be set to be 90 degrees.
In some embodiments, referring to fig. 2, step S103 further includes:
step S301: by adjusting the melt forming process parameters of the plurality of parts, the porosity of the segmented component near the center is made smaller.
It is to be understood that the porosity, average wire diameter, average pore size variation is adjusted by adjusting the melt forming process parameters of the different parts. The electron beam is used as an energy source, the advantages of high energy density and high utilization rate are utilized, zirconium alloy powder is fully melted, and the high density of the zirconium alloy porous part is ensured by setting specific processing parameters. The electron beam rapid scanning characteristic is utilized to preheat the forming bottom plate, so that extremely high part forming temperature is ensured, high heat input is promoted when the zirconium alloy porous implant is processed, high supercooling degree conditions are provided, meanwhile, stress concentration is reduced, deformation cracking risk is avoided greatly, and residual stress is reduced. The high vacuum clean environment reduces the impurity content in the zirconium alloy porous part, prevents the brittleness problem from deteriorating due to the too high impurity concentration, and simultaneously solves the problem that the zirconium alloy porous part is easy to oxidize at high temperature. Meanwhile, the zirconium alloy porous part with a complex shape can be directly formed without subsequent machining and heat treatment, so that the utilization rate of materials is improved, the manufacturing period is greatly shortened compared with the traditional machining process, and the cost is saved.
In some embodiments, referring to fig. 4, step S301 further includes:
the parts are sequentially marked as A1-An along the outward direction of the center, the corresponding porosity of each part is respectively K1-Kn, the size relation of the porosities of the parts is K1-K2-Kn, kn is 70-90%, and n is a natural number greater than or equal to 2.
It is understood that different printing processes can achieve different porosity requirements, so that the compressive strength of the non-compact structure can be effectively improved, and the bone ingrowth requirements can be met.
In some embodiments, step S301 further includes:
the melt forming process parameters include: the melting energy density is 100-1700J/m, the scanning current is 2.0-6.0 mA, and the scanning speed is 0.2-1.5 m/s.
It is understood that a melting energy density of 100 to 1700J/m can also be expressed by a scanning current of 2.0 to 6.0m/s and a scanning speed of 0.2 to 1.5 mA.
In some embodiments, referring to fig. 5, after step S103, further includes:
step S104: and cleaning and in-situ oxidizing the obtained zirconium-niobium alloy implant.
It will be appreciated that the biological part blank needs to be cleaned before the surface in situ oxidation treatment of the zirconium niobium porous implant after the additive manufacturing formation is performed until the part is free of powder particles and other contaminants. And then, carrying out in-situ oxidation treatment on the biological part blank to finally obtain the zirconium-niobium alloy implant part. Improving the wear resistance, biocompatibility, bioactivity and bone ingrowth induction capability of the parts and reducing bad factors on cell growth.
It should also be understood that the cleaning method of the zirconium niobium alloy implant blank is to perform powder cleaning with compressed gas with powder particles, then ultrasonic cleaning, and then fine blowing the compressed gas. The oxidation modes are high-temperature oxidation, micro-arc oxidation, anodic oxidation and the like, the surface of the oxidized zirconium-niobium alloy implant is well combined, and the wear resistance, the bioactivity, the biocompatibility, the bone ingrowth induction capacity and the like of the zirconium-niobium alloy implant are improved.
In addition, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. as used in the above description are directional or positional relationships as indicated based on the drawings, merely to facilitate description of the embodiments of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the embodiments of the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.
In the embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In embodiments of the invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (6)
1. A method of additive manufacturing of a zirconium niobium alloy implant, comprising:
establishing an integral three-dimensional model of the zirconium-niobium alloy implant, wherein the integral three-dimensional model is segmented from the shape center to the outer surface to obtain a decomposed three-dimensional model of a plurality of segmentation components; wherein the spatial relative positions of the plurality of decomposed three-dimensional models are consistent with the integral three-dimensional model; among the decomposition three-dimensional models of the plurality of segmentation assemblies, the decomposition three-dimensional models of the adjacent segmentation assemblies extend at the joint and form an overlapping part, and the overlapping length of the overlapping part is more than or equal to 0.05mm;
slicing the plurality of decomposed three-dimensional models layer by layer along the height direction, setting melting paths for the slice by layer, and guiding slice data into the additive manufacturing equipment;
taking a plurality of dividing assemblies as a plurality of parts to be printed in the same batch, and carrying out additive manufacturing on zirconium-niobium alloy powder through additive manufacturing equipment to obtain the zirconium-niobium alloy implant; wherein, the porosity of the split component near the center is made smaller by adjusting the melt forming process parameters of the plurality of parts;
wherein the monolithic three-dimensional model of the zirconium niobium alloy implant has a porous structure provided with at least one of the following features: the porosity is 30% -90%, the wire diameter is 50-500 μm, and the pore size is 150-900 μm.
2. An additive manufacturing method according to claim 1, wherein the maximum lengths of a plurality of divided members are each 10mm or less, and the lengths of divided members are lengths from a closest point to a farthest point of the divided members from the shape center in the same vector directed toward the shape center.
3. Additive manufacturing method according to claim 1, characterized in that the thickness of the layer-by-layer slice is 0.03mm or more and 0.1mm or less.
4. An additive manufacturing method according to claim 1, wherein the step of making the porosity of the near-center divided assembly smaller by adjusting the melt forming process parameters of the plurality of parts further comprises:
the parts are sequentially marked as A1-An along the outward direction of the center, the corresponding porosity of each part is respectively K1-Kn, the size relation of the porosities of the parts is that K1 is less than or equal to K2, kn is less than or equal to Kn, kn is more than or equal to 70% and less than or equal to 90%, and n is a natural number which is more than or equal to 2.
5. An additive manufacturing method according to claim 4, wherein the melt forming process parameters include: the melting energy density is 100-1700J/m, the scanning current is 2.0-6.0 mA, and the scanning speed is 0.2-1.5 m/s.
6. The additive manufacturing method according to any one of claims 1 to 5, wherein the steps of taking a plurality of dividing assemblies as a plurality of parts to be printed in the same batch, and performing additive manufacturing on zirconium-niobium alloy powder by an additive manufacturing device to obtain the zirconium-niobium alloy implant, further comprise:
and cleaning and in-situ oxidizing the obtained zirconium-niobium alloy implant.
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