CN113909497A - Preparation method of selective laser melting cobalt-chromium alloy and cobalt-chromium denture alloy material - Google Patents

Preparation method of selective laser melting cobalt-chromium alloy and cobalt-chromium denture alloy material Download PDF

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CN113909497A
CN113909497A CN202111175370.5A CN202111175370A CN113909497A CN 113909497 A CN113909497 A CN 113909497A CN 202111175370 A CN202111175370 A CN 202111175370A CN 113909497 A CN113909497 A CN 113909497A
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cobalt
chromium
selective laser
alloy
laser melting
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邱海平
江泽星
吴杰华
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Jiangxi Jinshi 3d Intelligent Manufacturing Technology Co ltd
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Jiangxi Jinshi 3d Intelligent Manufacturing Technology Co ltd
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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]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0006—Production methods
    • A61C13/0018—Production methods using laser
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0006—Production methods
    • A61C13/0019—Production methods using three dimensional printing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/08—Artificial teeth; Making same
    • 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
    • B22F10/60—Treatment of workpieces or articles after build-up
    • B22F10/64—Treatment of workpieces or articles after build-up by thermal means
    • 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
    • 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
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B33Y40/20—Post-treatment, e.g. curing, coating or polishing
    • 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
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • 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

Abstract

The invention is suitable for the technical field of materials, and provides a preparation method of selective laser melting cobalt-chromium alloy and a cobalt-chromium denture alloy material, which comprises the following steps: placing the cobalt-chromium alloy in selective laser equipment for melting treatment, wherein the selective laser melting process parameters are laser power of 200-; and (3) putting the cobalt-chromium alloy subjected to the selective laser melting treatment into a vacuum furnace, raising the temperature to 800-1100 ℃ at the heating rate of 100-120 ℃/min, preserving the temperature for 20-50min, and carrying out annealing treatment and cooling along with the temperature. The invention can form the high-precision cobalt-chromium denture alloy material, has the errors of 0.1-0.27 percent in the X direction, 0.2-0.3 percent in the Y direction and 0.3-0.5 percent in the Z direction respectively, and has excellent mechanical property.

Description

Preparation method of selective laser melting cobalt-chromium alloy and cobalt-chromium denture alloy material
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a preparation method of selective laser melting cobalt-chromium alloy and a cobalt-chromium denture alloy material.
Background
The additive manufacturing technology can be classified into Selective Laser Sintering (SLS), photocuring molding (SLA), Selective Laser Melting (SLM) and Electron Beam Melting (EBM) according to the molding manner. With the continuous progress of scientific technology, the application market of the additive manufacturing technology will be wider and wider. Compared with the traditional manufacturing technology, the additive manufacturing technology has the advantages that parts with complex structures can be directly molded without structural constraint, in the medical field, the additive manufacturing technology conforms to the trend of personalized and precise medical development, is applied to the fields of preoperative planning, surgical guide plates, in-vitro correction, dentistry, orthopedic implants and the like, is developed to the directions of degradable in-vivo implants and additive manufacturing biological tissues/organs and the like in the future, has a market space reaching the billions level, and is highly valued and widely popularized and applied in European and American countries. At present, many doctors begin to use the additive manufacturing technology to perform preoperative simulation and surgical plan making on the medical model customized for the patient, and this application can save a lot of surgical time for the doctors and relieve the pain of the patient. In addition, clinical applications of artificial prostheses directly molded by additive manufacturing techniques for implantation into the human body have also been studied at home and abroad. The artificial prosthesis manufactured by the additive is obtained by reconstruction in a reverse mode according to CT data of a patient, has high matching degree with the patient, is unique and accurate, and can ensure structural adaptability. The material increase manufacturing can directly manufacture the personalized medical product which accords with the physiological structure or the posture characteristic of a patient, greatly reduces the production period and the cost of the customized medical product, thoroughly changes the personalized treatment scheme of the traditional manufacturing technology, obviously improves the treatment success rate and the treatment effect, and assists in realizing personalized accurate medical treatment.
The implantation of the artificial prosthesis needs to meet medical standards, and the biomedical requires that medical materials not only meet the normal operation of human tissues and functions, but also avoid the generation of in vivo rejection phenomena after being implanted into a human body, so that the materials with good biocompatibility are required to be used as the raw materials of the artificial prosthesis. The cobalt-chromium alloy has excellent mechanical property and biocompatibility and is widely applied to the medical fields of orthopedics, oral cavity and the like as a metal implant material.
At present, foreign research on the preparation of cobalt-chromium alloy by SLM has achieved certain research results. The research shows that the addition of Cu reduces the recrystallization degree and increases the grain size, and the electrochemical test shows that the addition of Cu enables the corrosion potential to move to a higher positive direction, increases the corrosion current density, and the addition of Cu has proper volume fraction to improve the corrosion resistance of the cobalt-chromium alloy, and is beneficial to further design of CoCrW alloy powder containing antibacterial Cu. Yanjin Lu et al studied the effect of heat treatment and fluoride ions on the electrochemical corrosion behavior of selective laser melting CoCrW alloys. Yanjin Lu states that most toothpastes typically contain fluoride ions at concentrations of-1000-. While the research on the SLM technology in China mostly focuses on the development of SLM equipment, the research on the medical application of SLM forming cobalt-chromium alloy is relatively less. In addition, the mechanical properties of the cobalt-chromium alloy currently formed by SLM still need to be further improved.
Disclosure of Invention
The embodiment of the invention provides a preparation method of selective laser melting cobalt-chromium alloy, aiming at solving the technical problem.
The embodiment of the invention is realized in such a way that the preparation method of the selective laser melting cobalt-chromium alloy comprises the following steps:
placing the cobalt-chromium alloy in selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 200-400W, the spot diameter is 0.01-0.05mm, the sweeping speed is 500-700mm/s, and the powder layer thickness is 0.01-0.03 mm;
and (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 800-1100 ℃ at the heating rate of 100-120 ℃/min, carrying out annealing treatment after heat preservation for 20-50min, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material.
The embodiment of the invention also provides a cobalt-chromium denture alloy material which is prepared by the preparation method of the selective laser melting cobalt-chromium alloy.
According to the preparation method of the selective laser melting cobalt-chromium alloy provided by the embodiment of the invention, the cobalt-chromium alloy is placed in selective laser equipment to be subjected to melting treatment according to specific selective laser melting process parameters, and is placed in a vacuum furnace to be subjected to annealing treatment according to specific annealing process parameters, so that the cobalt-chromium denture alloy material with the density of 95-99% is successfully prepared, and the high-precision cobalt-chromium denture alloy material can be formed, wherein the error generated in the X direction is 0.1-0.27%, the error generated in the Y direction is 0.2-0.3%, and the error generated in the Z direction is 0.3-0.5%. In addition, the cobalt-chromium denture alloy material prepared by the invention has excellent mechanical properties, wherein the tensile strength is 1420-1470MPa, the yield strength is 1320-1380MPa, and the elongation is 23.5-25.5%.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the preparation method of the selective laser melting cobalt-chromium alloy provided by the embodiment of the invention, the cobalt-chromium alloy is placed in selective laser equipment to be subjected to melting treatment according to specific selective laser melting process parameters, and is placed in a vacuum furnace to be subjected to annealing treatment according to specific annealing process parameters, so that the cobalt-chromium denture alloy material with the density of 95-99% is successfully prepared, and the high-precision cobalt-chromium denture alloy material can be formed, wherein the error generated in the X direction is 0.1-0.27%, the error generated in the Y direction is 0.2-0.3%, and the error generated in the Z direction is 0.3-0.5%. In addition, the cobalt-chromium denture alloy material prepared by the invention has excellent mechanical properties, wherein the tensile strength is 1420-1470MPa, the yield strength is 1320-1380MPa, and the elongation is 23.5-25.5%.
The embodiment of the invention provides a preparation method of selective laser melting cobalt-chromium alloy, which comprises the following steps:
placing the cobalt-chromium alloy in selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 200-400W, the spot diameter is 0.01-0.05mm, the sweeping speed is 500-700mm/s, and the powder layer thickness is 0.01-0.03 mm;
and (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 800-1100 ℃ at the heating rate of 100-120 ℃/min, carrying out annealing treatment after heat preservation for 20-50min, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material.
In the embodiment of the invention, the cobalt-chromium alloy comprises the following elements in percentage by weight:
33.5 to 37.5% of Cr, 3.0 to 6.0% of Mo, 3.0 to 5.0% of Ti, 3.1 to 7.5% of W, and the balance of Co.
In the embodiment of the invention, the cobalt-chromium alloy is obtained by purchasing or is prepared according to the element formula of the weight percentage and a conventional alloy preparation method.
In a preferred embodiment of the present invention, the cobalt-chromium alloy comprises the following elements in percentage by weight:
35.5% of Cr, 4.5% of Mo, 4.0% of Ti, 5.3% of W and the balance of Co.
In the embodiment of the invention, the particle size of the cobalt-chromium alloy is 20-80 μm, and the sphericity is 90-95%.
In a preferred embodiment of the invention, the cobalt chromium alloy has a particle size of 50 μm and a sphericity of 95%.
In a preferred embodiment of the invention, the process parameters of selective laser melting are that the laser power is 300W, the spot diameter is 0.03mm, the scanning speed is 600mm/s, and the powder layer thickness is 0.02 mm.
In a preferred embodiment of the present invention, the annealing process parameters are a temperature of 950 ℃ and a holding time of 30 min.
The embodiment of the invention provides a cobalt-chromium denture alloy material, which is prepared by the preparation method of the selective laser melting cobalt-chromium alloy.
In the embodiment of the invention, the cobalt-chromium denture alloy material has the tensile strength of 1420-1470MPa, the yield strength of 1320-1380MPa and the elongation of 23.5-25.5 percent. Wherein the tensile strength, the yield strength and the elongation are according to the first part of a GBT 228.1-2010 metal material tensile test: room temperature test methods "standard for testing and calculation.
Examples of certain embodiments of the invention are given below, which are not intended to limit the scope of the invention.
Example 1
Placing the cobalt-chromium alloy in selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 250W, the spot diameter is 0.02mm, the scanning speed is 550mm/s, and the powder layer thickness is 0.01 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 35.5% of Cr, 4.2% of Mo, 4.3% of Ti, 5.5% of W and 50.5% of Co50%; the particle size was 30 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating to 850 ℃ from room temperature at the heating rate of 110 ℃/min, preserving heat for 25min, annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 2 was tested to have a tensile strength of 1425.14MPa, a yield strength of 1327.23MPa, and an elongation of 23.17%.
Example 2
Placing the cobalt-chromium alloy into selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 200W, the spot diameter is 0.01mm, the scanning speed is 500mm/s, and the powder layer thickness is 0.01 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 35.5% of Cr, 4.5% of Mo, 4.2% of Ti, 5.3% of W and 50.5% of Co50%; the particle size was 40 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 800 ℃ at the heating rate of 110 ℃/min, preserving the temperature for 20min for annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 1 was tested to have a tensile strength of 1420.84MPa, a yield strength of 1320.57MPa, and an elongation of 23.51%.
Example 3
Placing the cobalt-chromium alloy into selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 400W, the spot diameter is 0.04mm, the scanning speed is 700mm/s, and the powder layer thickness is 0.03 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 35.2% of Cr, 4.5% of Mo, 4.1% of Ti, 5.5% of W and 50.7% of Co50%; the particle size was 40 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 1100 ℃ at the heating rate of 110 ℃/min, preserving heat for 50min, annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 3 was tested to have a tensile strength of 1460.34MPa, a yield strength of 1368.51MPa, and an elongation of 24.25%.
Example 4
Placing the cobalt-chromium alloy into selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 350W, the spot diameter is 0.05mm, the scanning speed is 650mm/s, and the powder layer thickness is 0.03 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 35.5% of Cr, 4.5% of Mo, 4.5% of Ti, 5.0% of W and 50.5% of Co; the particle size was 50 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 1100 ℃ at the heating rate of 110 ℃/min, preserving heat for 50min, annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 4 was tested to have a tensile strength of 1462.21MPa, a yield strength of 1369.24MPa, and an elongation of 24.19%.
Example 5
Placing the cobalt-chromium alloy into selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 400W, the spot diameter is 0.04mm, the scanning speed is 700mm/s, and the powder layer thickness is 0.03 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 35.7% of Cr, 4.3% of Mo, 4.0% of Ti, 5.5% of W and 50.5% of Co; the particle size was 50 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 1050 ℃ at the heating rate of 110 ℃/min, preserving heat for 25min, annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 5 was tested to have a tensile strength of 1458.74MPa, a yield strength of 1365.04MPa, and an elongation of 24.08%.
Example 6
Placing the cobalt-chromium alloy in selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 350W, the spot diameter is 0.05mm, the scanning speed is 550mm/s, and the powder layer thickness is 0.02 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 33.5% of Cr, 3.0% of Mo, 3.0% of Ti, 3.1% of W and 57.4% of Co; the particle size was 50 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating to 1000 ℃ from room temperature at the heating rate of 110 ℃/min, preserving the temperature for 30min for annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 6 was tested to have a tensile strength of 1461.27MPa, a yield strength of 1368.05MPa, and an elongation of 23.71%.
Example 7
Placing the cobalt-chromium alloy into selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 350W, the spot diameter is 0.05mm, the scanning speed is 650mm/s, and the powder layer thickness is 0.03 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 34.5% of Cr, 3.5% of Mo, 3.5% of Ti, 3.4% of W and 55.1% of Co; the particle size was 50 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 1100 ℃ at the heating rate of 110 ℃/min, preserving the temperature for 40min for annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 7 was tested to have a tensile strength of 1460.55MPa, a yield strength of 1371.72MPa, and an elongation of 23.96%.
Example 8
Placing the cobalt-chromium alloy in selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 250W, the spot diameter is 0.02mm, the scanning speed is 550mm/s, and the powder layer thickness is 0.02 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 37.5% of Cr, 6.0% of Mo, 5.0% of Ti, 7.5% of W and 44.0% of Co; the particle size was 50 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating to 850 ℃ from room temperature at the heating rate of 110 ℃/min, preserving heat for 25min, annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 8 was tested to have a tensile strength of 1435.43MPa, a yield strength of 1335.35MPa, and an elongation of 24.15%.
Example 9
Placing the cobalt-chromium alloy into selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 200W, the spot diameter is 0.05mm, the scanning speed is 500mm/s, and the powder layer thickness is 0.02 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 36.5% of Cr, 5.5% of Mo, 4.8% of Ti, 7.0% of W and 46.2% of Co; the particle size was 50 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 800 ℃ at the heating rate of 110 ℃/min, preserving the temperature for 20min for annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 9 was tested to have a tensile strength of 1446.34MPa, a yield strength of 1327.41MPa, and an elongation of 24.37%.
Example 10
Placing the cobalt-chromium alloy into selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 300W, the spot diameter is 0.03mm, the scanning speed is 600mm/s, and the powder layer thickness is 0.02 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 35.5% of Cr, 4.5% of Mo, 4.0% of Ti, 5.3% of W and 50.7% of Co50%; the particle size was 50 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 950 ℃ at the heating rate of 110 ℃/min, preserving heat for 30min for annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 10 was tested to have a tensile strength of 1470.07MPa, a yield strength of 1380.04MPa, and an elongation of 25.50%.
Example 11
Placing the cobalt-chromium alloy into selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 200W, the spot diameter is 0.01mm, the scanning speed is 500mm/s, and the powder layer thickness is 0.01 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 35.5% of Cr, 4.5% of Mo, 4.0% of Ti, 5.3% of W and 50.7% of Co50%; the particle size was 50 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating to 800-1100 ℃ from room temperature at the heating rate of 110 ℃/min, carrying out annealing treatment for 20-50min, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 11 was tested to have a tensile strength of 1421.12MPa, a yield strength of 1322.63MPa, and an elongation of 23.52%.
Example 12
Placing the cobalt-chromium alloy into selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 400W, the spot diameter is 0.05mm, the scanning speed is 700mm/s, and the powder layer thickness is 0.03 mm; the cobalt-chromium alloy comprises the following elements in percentage by weight: 35.5% of Cr, 4.5% of Mo, 4.0% of Ti, 5.3% of W and 50.7% of Co50%; the particle size was 50 μm and the sphericity was 95%. And (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 1100 ℃ at the heating rate of 110 ℃/min, preserving heat for 50min, annealing, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material. The cobalt chromium denture alloy material of example 12 was tested to have a tensile strength of 1462.27MPa, a yield strength of 1374.52MPa, and an elongation of 24.02%.
In addition, the invention successfully prepares the cobalt-chromium denture alloy material with the compactness of 95-99 percent by placing the cobalt-chromium alloy in selective laser equipment for melting treatment according to specific selective laser melting technological parameters and placing the cobalt-chromium denture alloy in a vacuum furnace for annealing treatment according to specific annealing process parameters, and can form high-precision cobalt-chromium denture alloy materials with the errors of 0.1-0.27 percent, 0.2-0.3 percent and 0.3-0.5 percent respectively in the X direction, the Y direction and the Z direction.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. A preparation method of selective laser melting cobalt-chromium alloy is characterized by comprising the following steps:
placing the cobalt-chromium alloy in selective laser equipment for melting treatment, wherein the selective laser melting process parameters are that the laser power is 200-400W, the spot diameter is 0.01-0.05mm, the sweeping speed is 500-700mm/s, and the powder layer thickness is 0.01-0.03 mm;
and (3) placing the cobalt-chromium alloy subjected to selective laser melting treatment into a vacuum furnace, vacuumizing, heating from room temperature to 800-1100 ℃ at the heating rate of 100-120 ℃/min, carrying out annealing treatment after heat preservation for 20-50min, and cooling along with the temperature to obtain the cobalt-chromium denture alloy material.
2. The method of preparing a selective laser melting cobalt chromium alloy as claimed in claim 1 wherein said cobalt chromium alloy comprises the following elements in weight percent:
33.5 to 37.5% of Cr, 3.0 to 6.0% of Mo, 3.0 to 5.0% of Ti, 3.1 to 7.5% of W, and the balance of Co.
3. The method of preparing a selective laser melting cobalt chromium alloy as claimed in claim 1 or 2, wherein said cobalt chromium alloy comprises the following elements in weight percent:
35.5% of Cr, 4.5% of Mo, 4.0% of Ti, 5.3% of W and the balance of Co.
4. A method of producing a selective laser melting cobalt chromium alloy as claimed in any one of claims 1 to 3 wherein the cobalt chromium alloy has a particle size of 20 to 80 μm and a sphericity of 90 to 95%.
5. The method of preparing a selective laser melting cobalt chromium alloy as claimed in any one of claims 1 to 4 wherein the cobalt chromium alloy has a particle size of 50 μm and a sphericity of 95%.
6. The preparation method of the selective laser melting cobalt-chromium alloy according to claim 1, wherein the selective laser melting process parameters are that the laser power is 300W, the spot diameter is 0.03mm, the scanning speed is 600mm/s, and the powder layer thickness is 0.02 mm.
7. The method for preparing the selective laser melting cobalt-chromium alloy according to claim 1, wherein the annealing process parameters are 950 ℃ and the holding time is 30 min.
8. A cobalt-chromium denture alloy material, characterized in that, the cobalt-chromium denture alloy is prepared by the preparation method of the selective laser melting cobalt-chromium alloy according to any one of claims 1 to 7.
9. The cobalt-chromium denture alloy material of claim 8, wherein the cobalt-chromium denture alloy material has a tensile strength of 1420-1470MPa, a yield strength of 1320-1380MPa, and an elongation of 23.5-25.5%.
CN202111175370.5A 2021-10-09 2021-10-09 Preparation method of selective laser melting cobalt-chromium alloy and cobalt-chromium denture alloy material Pending CN113909497A (en)

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