CN111331137B - Preparation method of CoCrMo bone trabecula structure - Google Patents
Preparation method of CoCrMo bone trabecula structure Download PDFInfo
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- CN111331137B CN111331137B CN202010140329.3A CN202010140329A CN111331137B CN 111331137 B CN111331137 B CN 111331137B CN 202010140329 A CN202010140329 A CN 202010140329A CN 111331137 B CN111331137 B CN 111331137B
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- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 90
- 239000010410 layer Substances 0.000 claims abstract description 42
- 238000002844 melting Methods 0.000 claims abstract description 36
- 230000008018 melting Effects 0.000 claims abstract description 36
- 238000010894 electron beam technology Methods 0.000 claims abstract description 35
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 238000005520 cutting process Methods 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000002356 single layer Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 21
- 238000003892 spreading Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 8
- 238000010309 melting process Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- 238000007373 indentation Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 239000007943 implant Substances 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 5
- 239000011733 molybdenum Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 210000005260 human cell Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000000602 vitallium Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
- B22F10/362—Process control of energy beam parameters for preheating
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- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/80—Data acquisition or data processing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- B33—ADDITIVE MANUFACTURING TECHNOLOGY
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- B33Y50/00—Data acquisition or data processing for additive manufacturing
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- B33Y70/00—Materials specially adapted for additive manufacturing
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- B33Y80/00—Products made by additive manufacturing
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/28—Bones
- A61F2002/2835—Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30772—Apertures or holes, e.g. of circular cross section
- A61F2002/30784—Plurality of holes
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Abstract
The invention provides a preparation method of a CoCrMo bone trabecula structure, which comprises the following steps: firstly, constructing a three-dimensional model; secondly, importing the three-dimensional model into layer cutting software to obtain layer cutting data; thirdly, planning a path of the cut layer data, and guiding the planned data into selective melting equipment of an electron beam of the powder bed; fourthly, loading CoCrMo powder into selective melting equipment, and vacuumizing; fifthly, preheating the formed substrate; sixthly, uniformly paving CoCrMo powder on the formed substrate, and preheating; seventhly, selective melting is carried out on the CoCrMo powder according to the imported data to obtain a single-layer CoCrMo sheet layer; eighthly, repeating the sixth step and the seventh step until a complete CoCrMo bone trabecula structural member is formed, and taking out the CoCrMo bone trabecula structural member after cooling; the invention adopts the powder bed electron beam selective melting technology, the forming efficiency is fast, the precision is high, the prepared CoCrMo bone trabecula has high strength, low modulus and low oxygen content, and is suitable for human body implants.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a preparation method of a CoCrMo bone trabecula structure.
Background
Among the commonly used medical implant materials, TC4 has problems of poor wear resistance, insufficient shear strength, etc., 316L stainless steel has poor biocompatibility, Ta metal has high density and high price, and CoCrMo alloy is more and more widely applied to medical implant materials because of its good mechanical properties, ultrahigh wear resistance and corrosion resistance, and excellent biocompatibility. At present, a CoCrMo alloy implant is generally prepared by a forging method, but the elastic modulus of the CoCrMo alloy implant is far higher than that of a human bone, so that the stress shielding phenomenon is easily caused, and the operation failure is caused. The trabecular bone structure can reduce the elastic modulus of the CoCrMo alloy implant, and can induce the human cells to grow in by adjusting the pore size, thereby being the development direction of future implant materials.
The powder bed melting technology can realize various bone trabecula structures such as ordered holes, disordered holes, gradient holes and the like by spreading powder layer by layer and selectively melting by energy beams. The techniques are classified into Selective Laser Melting (SLM) and Electron Beam Selective Melting (EBM) techniques, depending on the energy source. At present, research aiming at a preparation method of a CoCrMo trabecular bone structure mainly focuses on an SLM technology, and the trabecular bone structure for an implant prepared by the technology has the following defects: the mechanical property is poor, and a large number of defects exist in the trabecula bone prepared by the selective laser melting technology; (2) the response period is long, a large amount of post-treatment is needed to be carried out on the workpiece formed by selective laser melting, and the processing time is long; (3) the sample cleanliness is not high, more impurities can be introduced in the sample forming and post-treatment processes, and the cleanliness cannot meet the requirements.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of a CoCrMo bone trabecula structure, the method adopts a powder bed electron beam selective melting technology, the forming efficiency is high, the precision is high, and the prepared CoCrMo bone trabecula has high strength, low modulus and low oxygen content and is suitable for human body implants.
In order to solve the technical problem, the invention provides a preparation method of a CoCrMo bone trabecular structure, which comprises the following steps:
step one, constructing a three-dimensional model of a sample to be processed;
step two, importing the CoCrMo bone trabecula structure three-dimensional model obtained in the step one into layer cutting software for layer cutting processing to obtain layer cutting data;
step three, performing path planning on the layer cutting data obtained in the step two, scanning the outer contour in a point scanning mode, filling the inner contour in the remaining area, and guiding the data after the path planning into powder bed electron beam selective melting equipment;
step four, filling CoCrMo powder into a powder bin of powder bed electron beam selective melting equipment, and vacuumizing the equipment until the vacuum degree of a forming chamber is lower than 10-2Pa, vacuum degree of electron gun chamber lower than 10-3Pa；
Step five, carrying out preheating treatment on the formed substrate by using electron beams;
step six, uniformly spreading CoCrMo powder in the powder bin on a forming substrate, and carrying out preheating treatment on the forming substrate;
seventhly, selectively melting CoCrMo powder according to the imported data to obtain a single-layer CoCrMo sheet layer;
step eight, repeating the powder spreading and preheating process in the step six and the selective area melting process in the step seven until a complete CoCrMo bone trabecular structural member is formed, and taking out the CoCrMo bone trabecular structural member after cooling to room temperature;
and step nine, placing the formed part obtained in the step eight in a glove box to remove the unmelted CoCrMo powder in the pores, and obtaining the CoCrMo medical bone trabecular structural member.
Preferably, the thickness of the slicing layer in the second step is 0.035-0.07 mm.
Preferably, the path planning in step three is to set the surface contour to be retracted by 0.02-0.05 mm.
Preferably, the sphericity of the CoCrMo powder in the fourth step is more than 80%, the ratio of the particle diameter is 45-105 μm is more than 90%, the oxygen content is less than 500ppm, and the fluidity is more than 25s/50 g.
Preferably, in the fifth step, the molding substrate is made of 316L stainless steel or molybdenum.
Preferably, in the fifth step, the preheating current is 10 to 20mA, the scanning speed of the electron beam is 10 to 15m/s, and the preheating temperature of the bottom plate is 700 to 850 ℃.
Preferably, the preheating current after powder spreading in the sixth step is 20-30 mA, and the preheating time is 10-20 s.
Preferably, in the seventh step, the selective melting current is 3.5 to 10mA, and the scanning speed of the electron beam is 0.35 to 0.7 m/s.
Preferably, in the ninth step, the porosity of the CoCrMo bone trabecular structure is 60% -81%, and the elastic modulus is 0.38-6.76 GPa.
Preferably, the compressive strength of the CoCrMo bone trabecula structure is 15-186 MPa.
The invention relates to a preparation method of a CoCrMo bone trabecula structure, which has the advantages that compared with the prior design: (1) the whole process of the forming process of the CoCrMo bone trabecula structure prepared by the invention is carried out in high vacuum, and the oxygen content of the bone trabecula structure is low; the sample piece is formed without linear cutting and heat treatment, so that other impurities are avoided, and the good biocompatibility of the CoCrMo bone trabecula structure is ensured. (2) The CoCrMo bone trabecula structure prepared by the method adopts the electron beam to continuously preheat the powder bed in the forming process, so that the thermal stress in the forming process of the sample piece can be obviously reduced, and the mechanical property of the formed sample piece is excellent. (3) The electronic beam selective melting process has high forming efficiency, less post-treatment processes, short response time from the model to the application of the sample piece and low required cost which is only half of that of selective laser melting forming. (4) The porosity of the CoCrMo bone trabecula structure prepared by the invention is 60-81%, the elastic modulus is 0.38-6.76 GPa, the porosity and the pore size are adjustable, and the CoCrMo bone trabecula structure has high matching degree with human bones.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
The invention relates to a preparation method of a CoCrMo bone trabecula structure, which comprises the following steps:
step one, constructing a three-dimensional model of a sample piece to be processed.
Step two, importing the CoCrMo bone trabecula structure three-dimensional model obtained in the step one into layer cutting software for layer cutting processing to obtain layer cutting data; the thickness of the cutting layer is 0.035 mm.
Step three, performing path planning on the layer cutting data obtained in the step two, scanning the outer contour in a point scanning mode, filling the inner contour in the remaining area, and guiding the data after the path planning into powder bed electron beam selective melting equipment; the path is planned with a 0.02mm indentation of the surface.
Step four, placing CoCrMo powder (the composition of the powder conforms to American ASTM F75-18 Standard Specification for Cobalt Alloy-28 Chromium-6Molybdenum Alloy coatings and coatings Alloy for scientific Implants (UNS R30075) or Chinese GB 17100 and 1997 cast Cobalt Chromium Molybdenum Alloy for Surgical Implants) into a powder bin of a melting device in a powder bed electron beam selection area, and vacuumizing the device until the vacuum degree of a forming chamber is lower than 10- 2Pa, vacuum degree of electron gun chamber lower than 10-3Pa, the oxygen content of the CoCrMo trabecular bone can be ensured to be lower than a limit value under the vacuum degree; the sphericity of the CoCrMo powder is 85%, and the high sphericity can ensure the fluidity of the powder, thereby ensuring the uniformity of powder paving; the grain diameter of 45-105 mu m is more than 90%, the oxygen content of the powder is 147ppm, and the powder fluidity is 17s/50 g. The particle size of the powder is 45-105 mu m, so that the powder blowing phenomenon caused by fine powder can be prevented, and the phenomenon that partial particles are melted and partially unmelted due to over-wide powder particle size distribution can be reduced.
Step five, carrying out preheating treatment on the formed substrate by using electron beams; the forming substrate is made of 316L stainless steel or molybdenum, the preheating current is 10mA, the scanning speed of an electron beam is 10m/s, and the preheating temperature of the bottom plate is 700 ℃.
Step six, uniformly spreading CoCrMo powder in the powder bin on a forming substrate, and carrying out preheating treatment on the forming substrate; the preheating current after powder spreading is 20mA, and the preheating time is 20 s.
Seventhly, selectively melting CoCrMo powder according to the imported data to obtain a single-layer CoCrMo sheet layer; the selective melting current is 3.5mA, and the scanning speed of the electron beam is 0.4 m/s.
And step eight, repeating the powder paving and preheating processes in the step six and the selective area melting process in the step seven until a complete CoCrMo bone trabecular structural member is formed, and taking out the CoCrMo bone trabecular structural member after cooling to room temperature.
And step nine, placing the formed part obtained in the step eight in a glove box to remove the unmelted CoCrMo powder in the pores, and obtaining the CoCrMo medical bone trabecular structural member.
Through detection, the porosity of the CoCrMo bone trabecular structure prepared by the embodiment is 81%, the elastic modulus is 0.38GPa, and the compressive strength is 15 MPa.
Example 2
The invention relates to a preparation method of a CoCrMo bone trabecula structure, which comprises the following steps:
step one, constructing a three-dimensional model of a sample piece to be processed.
Step two, importing the CoCrMo bone trabecula structure three-dimensional model obtained in the step one into layer cutting software for layer cutting processing to obtain layer cutting data; the thickness of the cutting layer is 0.05 mm.
Step three, performing path planning on the layer cutting data obtained in the step two, scanning the outer contour in a point scanning mode, filling the inner contour in the remaining area, and guiding the data after the path planning into powder bed electron beam selective melting equipment; the path plan is a 0.07mm indentation of the skin.
Step four, filling CoCrMo powder into a powder bin of powder bed electron beam selective melting equipment, and vacuumizing the equipment until the vacuum degree of a forming chamber is lower than 10-2Pa, vacuum degree of electron gun chamber lower than 10-3Pa; the sphericity of the CoCrMo powder is 90%, the particle size of 45-105 mu m is more than 90%, the oxygen content of the powder is 300ppm, and the powder flowability is 14s/50 g.
Step five, carrying out preheating treatment on the formed substrate by using electron beams; the forming substrate is made of 316L stainless steel or molybdenum, the preheating current is 15mA, the scanning speed of an electron beam is 12m/s, and the preheating temperature of the bottom plate is 800 ℃.
Step six, uniformly spreading CoCrMo powder in the powder bin on a forming substrate, and carrying out preheating treatment on the forming substrate; after powder spreading, the preheating current is 27mA, and the preheating time is 15 s.
Seventhly, selectively melting CoCrMo powder according to the imported data to obtain a single-layer CoCrMo sheet layer; the selective melting current is 3.8mA, and the scanning speed of the electron beam is 0.35 m/s.
Step eight, repeating the powder spreading and preheating process in the step six and the selective area melting process in the step seven until a complete CoCrMo bone trabecular structural member is formed, and taking out the CoCrMo bone trabecular structural member after cooling to room temperature;
and step nine, placing the formed part obtained in the step eight in a glove box to remove the unmelted CoCrMo powder in the pores, and obtaining the CoCrMo medical bone trabecular structural member.
Through detection, the porosity of the CoCrMo bone trabecular structure prepared by the embodiment is 76%, the elastic modulus is 0.53GPa, and the compressive strength is 36 MPa.
Example 3
The invention relates to a preparation method of a CoCrMo bone trabecula structure, which comprises the following steps:
step one, constructing a three-dimensional model of a sample piece to be processed.
Step two, importing the CoCrMo bone trabecula structure three-dimensional model obtained in the step one into layer cutting software for layer cutting processing to obtain layer cutting data; the thickness of the cutting layer is 0.07 mm.
Step three, performing path planning on the layer cutting data obtained in the step two, scanning the outer contour in a point scanning mode, filling the inner contour in the remaining area, and guiding the data after the path planning into powder bed electron beam selective melting equipment; the path plan is that the surface layer is retracted by 0.05 mm.
Step four, filling CoCrMo powder into a powder bin of powder bed electron beam selective melting equipment, and vacuumizing the equipment until the vacuum degree of a forming chamber is lower than 10-2Pa, vacuum degree of electron gun chamber lower than 10-3Pa; the sphericity of the CoCrMo powder is 90%, the particle size of 45-105 mu m is more than 90%, the oxygen content of the powder is 300ppm, and the powder flowability is higher than 15s/50 g.
Step five, carrying out preheating treatment on the formed substrate by using electron beams; the forming substrate is made of 316L stainless steel or molybdenum, the preheating current is 20mA, the scanning speed of an electron beam is 15m/s, and the preheating temperature of the bottom plate is 850 ℃.
Step six, uniformly spreading CoCrMo powder in the powder bin on a forming substrate, and carrying out preheating treatment on the forming substrate; the preheating current after powder spreading is 30mA, and the preheating time is 10 s.
Seventhly, selectively melting CoCrMo powder according to the imported data to obtain a single-layer CoCrMo sheet layer; the selective melting current is 5mA, and the scanning speed of the electron beam is 0.4 m/s.
And step eight, repeating the powder paving and preheating processes in the step six and the selective area melting process in the step seven until a complete CoCrMo bone trabecular structural member is formed, and taking out the CoCrMo bone trabecular structural member after cooling to room temperature.
And step nine, placing the formed part obtained in the step eight in a glove box to remove the unmelted CoCrMo powder in the pores, and obtaining the CoCrMo medical bone trabecular structural member.
Through detection, the porosity of the CoCrMo bone trabecular structure prepared by the embodiment is 73%, the elastic modulus is 1.26GPa, and the compressive strength is 66 MPa.
Example 4
The invention relates to a preparation method of a CoCrMo bone trabecula structure, which comprises the following steps:
step one, constructing a three-dimensional model of a sample piece to be processed.
Step two, importing the CoCrMo bone trabecula structure three-dimensional model obtained in the step one into layer cutting software for layer cutting processing to obtain layer cutting data; the thickness of the cutting layer is 0.05 mm.
Step three, performing path planning on the layer cutting data obtained in the step two, scanning the outer contour in a point scanning mode, filling the inner contour in the remaining area, and guiding the data after the path planning into powder bed electron beam selective melting equipment; the path plan is that the surface layer is retracted by 0.035 mm.
Step four, filling CoCrMo powder into a powder bin of powder bed electron beam selective melting equipment, and vacuumizing the equipment until the vacuum degree of a forming chamber is lower than 10-2Pa, vacuum degree of electron gun chamber lower than 10-3Pa; the sphericity of the CoCrMo powder is 90%, the particle size of 45-105 mu m is more than 90%, the oxygen content of the powder is 300ppm, and the powder flowability is15s/50g。
Step five, carrying out preheating treatment on the formed substrate by using electron beams; the forming substrate is made of 316L stainless steel or molybdenum, the preheating current is 15mA, the scanning speed of an electron beam is 12m/s, and the preheating temperature of the bottom plate is 780 ℃.
Step six, uniformly spreading CoCrMo powder in the powder bin on a forming substrate, and carrying out preheating treatment on the forming substrate; after powder spreading, the preheating current is 27mA, and the preheating time is 15 s.
Seventhly, selectively melting CoCrMo powder according to the imported data to obtain a single-layer CoCrMo sheet layer; the selective melting current is 10mA, and the scanning speed of the electron beam is 0.7 m/s.
Step eight, repeating the powder spreading and preheating process in the step six and the selective area melting process in the step seven until a complete CoCrMo bone trabecular structural member is formed, and taking out the CoCrMo bone trabecular structural member after cooling to room temperature;
and step nine, placing the formed part obtained in the step eight in a glove box to remove the unmelted CoCrMo powder in the pores, and obtaining the CoCrMo medical bone trabecular structural member.
Through detection, the porosity of the CoCrMo bone trabecular structure prepared by the embodiment is 60%, the elastic modulus is 6.76GPa, and the compressive strength is 186 MPa.
Claims (6)
1. A preparation method of a CoCrMo bone trabecula structure is characterized by comprising the following steps:
step one, constructing a three-dimensional model of a sample to be processed;
step two, importing the CoCrMo bone trabecula structure three-dimensional model obtained in the step one into layer cutting software for layer cutting processing to obtain layer cutting data;
step three, performing path planning on the layer cutting data obtained in the step two, scanning the outer contour in a point scanning mode, filling the inner contour in the remaining area, and guiding the data after the path planning into powder bed electron beam selective melting equipment;
step four, filling CoCrMo powder into a powder bin of powder bed electron beam selective melting equipment, and vacuumizing the equipment until the vacuum degree of a forming chamber is lower than 10-2Pa, vacuum degree of electron gun chamber lower than 10-3Pa；
Step five, carrying out preheating treatment on the formed substrate by using electron beams;
step six, uniformly spreading CoCrMo powder in the powder bin on a forming substrate, and carrying out preheating treatment on the forming substrate;
seventhly, selectively melting CoCrMo powder according to the imported data to obtain a single-layer CoCrMo sheet layer;
step eight, repeating the powder spreading and preheating process in the step six and the selective area melting process in the step seven until a complete CoCrMo bone trabecular structural member is formed, and taking out the CoCrMo bone trabecular structural member after cooling to room temperature;
step nine, placing the formed part obtained in the step eight in a glove box to remove unmelted CoCrMo powder in the pores to obtain a CoCrMo medical bone trabecular structural member;
in the third step, the path is planned to be a surface layer profile with the indentation of 0.02-0.05 mm;
in the fourth step, the sphericity of the CoCrMo powder is more than 80%, the ratio of the particle size of 45-105 mu m is more than 90%, the oxygen content is lower than 500ppm, and the fluidity is higher than 25s/50 g;
in the seventh step, the selective area melting current is 3.5-10 mA, and the scanning speed of the electron beam is 0.35-0.7 m/s;
in the ninth step, the porosity of the CoCrMo bone trabecula structure is 60% -81%, and the elastic modulus is 0.38-6.76 Gpa.
2. The method for preparing a CoCrMo bone trabecular structure as claimed in claim 1, wherein the thickness of said cut layer in step two is 0.035-0.07 mm.
3. The method for preparing a CoCrMo bone trabecular structure as claimed in claim 1, wherein in step five said forming substrate is made of 316L stainless steel or molybdenum metal.
4. The method for preparing a CoCrMo bone trabecular structure according to claim 1 or 3, wherein in the fifth step, the preheating current is 10-20 mA, the scanning speed of electron beams is 10-15 m/s, and the preheating temperature of a bottom plate is 700-850 ℃.
5. The preparation method of the CoCrMo bone trabecular structure as claimed in claim 1, wherein in the sixth step, the preheating current after powder laying is 20-30 mA, and the preheating time is 10-20 s.
6. The method for preparing the CoCrMo bone trabecular structure according to claim 1, wherein the compressive strength of the CoCrMo bone trabecular structure is 15-186 MPa.
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| CN103273065A (en) * | 2013-05-31 | 2013-09-04 | 西北有色金属研究院 | Electron beam selective melting forming method for weld-less metal honeycomb components |
| CN104887351A (en) * | 2015-05-31 | 2015-09-09 | 西安赛隆金属材料有限责任公司 | High-strength small-bore metal bone trabecula and preparation method of same |
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| CN103273065A (en) * | 2013-05-31 | 2013-09-04 | 西北有色金属研究院 | Electron beam selective melting forming method for weld-less metal honeycomb components |
| CN104887351A (en) * | 2015-05-31 | 2015-09-09 | 西安赛隆金属材料有限责任公司 | High-strength small-bore metal bone trabecula and preparation method of same |
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