CN114214550A - Medical magnesium alloy and preparation method thereof - Google Patents
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 86
- 238000000034 method Methods 0.000 claims abstract description 38
- 239000011777 magnesium Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000002844 melting Methods 0.000 claims abstract description 20
- 230000008018 melting Effects 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims description 20
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000011229 interlayer Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 5
- 238000003892 spreading Methods 0.000 claims description 5
- 230000007480 spreading Effects 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 8
- 150000002910 rare earth metals Chemical class 0.000 abstract description 7
- 238000005266 casting Methods 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
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- 208000020084 Bone disease Diseases 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
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- 238000006731 degradation reaction Methods 0.000 description 3
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- 229910000748 Gd alloy Inorganic materials 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
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- 238000002513 implantation Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
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- 101710138657 Neurotoxin Proteins 0.000 description 1
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- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
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- 210000001124 body fluid Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 231100000618 neurotoxin Toxicity 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000012890 simulated body fluid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/02—Inorganic materials
- A61L27/04—Metals or alloys
- A61L27/047—Other specific metals or alloys not covered by A61L27/042 - A61L27/045 or A61L27/06
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61L27/58—Materials at least partially resorbable by the body
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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
- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
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- A61L2430/00—Materials or treatment for tissue regeneration
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Abstract
The invention relates to the technical field of biomedical metal materials, and particularly discloses a medical magnesium alloy and a preparation method thereof. The chemical formula of the medical magnesium alloy is Mg-1% Zn-x% Gd, wherein x is 0.25-1. The invention adopts a selective laser melting method to prepare the medicineUsing magnesium alloy, wherein the conditions of the selective laser melting method are as follows: the laser power is 60W-75W, and the scanning speed is 200 mm/s-400 mm/s. The application forms a new crystal phase Mg by adding Ga element and limiting the component content thereof5The Gd rare earth phase reduces the corrosion rate of the Gd rare earth phase, and the powder materials are tightly bonded together after being melted by adopting a selective laser melting method, so that a nearly fully compact processing entity can be obtained, the problems of air holes, shrinkage porosity and the like in the traditional magnesium alloy casting process are effectively solved, the grain structure is effectively refined, and the mechanical property of the medical magnesium alloy is improved.
Description
Technical Field
The invention relates to the technical field of biomedical metal materials, in particular to a medical magnesium alloy and a preparation method thereof.
Background
The magnesium alloy has the characteristics of low density, high specific strength and good biocompatibility, and is particularly suitable for being used as a biomedical instrument for repairing orthopedic diseases. Compared with titanium alloy (55 GPa-110 GPa) and stainless steel (210GPa), the magnesium alloy has the elastic modulus of 45GPa, is close to the natural bone (3 GPa-20 GPa) of a human body, and can greatly avoid the stress shielding effect. The standard electrode potential of the pure magnesium and the alloy thereof is lower, so the magnesium can be spontaneously degraded in the body fluid environment of a human body, can be taken out without secondary operation after being implanted into the human body, and relieves the pain and economic burden of a patient. However, magnesium alloy has poor corrosion resistance and high degradation speed, so that the strength of the molten steel and the strength of the magnesium alloy in the later period of implantation are reduced rapidly, and the requirement of internal fixation is difficult to meet.
At present, researchers mainly improve the corrosion resistance of magnesium alloys such as Mg-Zn-Al, Mg-Zn-Zr and the like by an alloying method, although the corrosion resistance of the alloys can be improved to a certain extent, the alloys are mostly used for industrial manufacture, and the biocompatibility, the biological safety and the mechanical property of the alloys are still to be deeply researched, for example, Al element is neurotoxin and seriously harms the health of human bodies.
In addition, due to the limitation of the manufacturing level and the cost, most of the bone implantation medical instruments clinically used at present are standard instruments produced in batch and prepared by adopting the traditional casting process. Because the constitution of the patient and the injury of the affected part are different from person to person, the standard medical apparatus is difficult to achieve the best treatment effect. The traditional casting process also has the defects of air holes, shrinkage porosity and the like, and the mechanical property and the service life of the machined part are seriously influenced.
Disclosure of Invention
In view of the above, the medical magnesium alloy and the preparation method thereof are provided, the medical magnesium alloy with the compression strength of 377.73MPa and the density of 98.52% and the chemical formula of Mg-1% Zn-x% Gd (x is 0.25-1) is prepared by adopting a selective laser melting method, and the medical magnesium alloy has the advantages of high specific strength, good biocompatibility, fine grain structure and good mechanical property, and can be widely applied to the clinical bone disease repair.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
the medical magnesium alloy has a chemical formula of Mg-1% Zn-x% Gd, wherein x is 0.25-1.
Compared with the prior art, the medical magnesium alloy provided by the application has the following advantages:
the medical magnesium alloy provided by the application forms a new crystal phase Mg by adding Ga element and limiting the component content thereof5The Gd rare earth phase reduces the corrosion rate of the medical magnesium alloy, improves the mechanical property of the medical magnesium alloy and meets the use requirements of clinical bone diseases.
Optionally, the chemical formula of the medical magnesium alloy is Mg-1% Zn-0.5% Gd.
Further, the application also provides a preparation method of the medical magnesium alloy, which at least comprises the following steps:
weighing atomized spherical Mg powder, Mg-5% Zn powder and Mg-15% Gd powder according to the raw material ratio, and mechanically mixing to obtain a powder material;
secondly, introducing inert gas, and screening the powder material when the oxygen content is less than 7000ppm to obtain pretreated powder;
step three, preparing the medical magnesium alloy from the pretreatment powder by adopting a selective laser melting method, wherein the selective laser melting method has the following conditions: the laser power is 60W-75W, and the scanning speed is 200 mm/s-400 mm/s.
Compared with the prior art, the preparation method of the medical magnesium alloy has the following advantages:
according to the method, the powder materials with specific particle sizes are screened, and the powder materials are tightly bonded together after being melted by adopting a selective laser melting method, so that a nearly fully-compact processing entity can be obtained, the problems of air holes, shrinkage porosity and the like in the traditional magnesium alloy casting process are effectively solved, the grain structure is effectively refined, and the mechanical property of the medical magnesium alloy is improved.
Refining the grain structure according to the formula [1] of Hall-Petch:
wherein is σsMagnesium alloy yield limit; sigma0And alphaHPIs the material coefficient; dgIs the average grain size of the magnesium alloy. Therefore, the mechanical property of the same magnesium alloy material is in inverse proportion to the grain size, and the mechanical property is better when the grain size of the medical magnesium alloy is smaller.
The grain size of the alpha-Mg matrix of the medical magnesium alloy obtained by adopting the selective laser melting method with specific parameters is less than 1 mu m, the size of the generated Mg5Gd rare earth phase is about 100nm, and the grain size is finer, so that the preparation process provided by the application can obviously improve the mechanical property of the medical magnesium alloy.
Optionally, in the third step, the laser power is 70W, and the scanning speed is 350 mm/s.
The laser power is a main factor influencing the mechanical property of the medical magnesium alloy, when the laser power is too low, the magnesium alloy can not obtain enough laser energy, and a plurality of pores are formed inside the magnesium alloy, so that the mechanical property is reduced; when the laser power is too high, the magnesium alloy obtains too much laser energy to cause the defects of spheroidization and splashing, the burning loss of Mg element is aggravated, and the mechanical property of the magnesium alloy is reduced, so that the medical magnesium alloy prepared by the method has better mechanical property under the preferable laser power condition.
Optionally, in the third step, the scanning interval is 40 to 45 μm, the powder layer spreading thickness is 40 to 60 μm, the interlayer rotation angle is 67 °, the spot diameter is 70 μm, and the fan circulation frequency is 20 to 35 Hz.
Optionally, the scanning distance is 42 μm, the powder layer thickness is 50 μm, and the fan cycle frequency is 25 Hz.
The optimal technological parameters ensure that the prepared medical magnesium alloy has small grain size and better mechanical property, and can be widely applied to the clinical bone disease repair.
The optimal circulating frequency parameter of the fan is set, so that the smoke generated by burning loss can be blown into the circulating system, and the Mg-Zn-Gd alloy powder on the surface of the substrate is not blown up, thereby reducing the influence of the burning loss smoke on the magnesium alloy molding quality to a certain extent.
Optionally, in the first step, the mechanical mixing conditions are as follows: the rotating speed is 10 rpm-20 rpm, and the time is 7.5 h-8.5 h.
Optionally, in the second step, the pore size adopted by the screening is 55 μm to 60 μm.
Optionally, the inert gas is argon or nitrogen.
Further optionally, the inert gas is argon.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic illustration of a zone laser melting process provided by an embodiment of the present invention;
FIG. 2 is a graph showing the corrosion rate of the medical magnesium alloy provided in test example 1 of the present invention over 72 hours;
FIG. 3 is a SEM photograph provided in test example 2 of the present invention;
FIG. 4 is a TEM photograph provided in test example 2 of the present invention;
FIG. 5 is a particle size distribution diagram provided in test example 4 of the present invention.
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.
Example 1
The embodiment of the application provides a medical magnesium alloy, and the chemical formula of the medical magnesium alloy is Mg-1% Zn-0.25% Gd.
The preparation method of the medical magnesium alloy comprises the following steps:
step one, weighing atomized spherical Mg powder, Mg-5% Zn powder and Mg-15% Gd powder according to the raw material ratio, mechanically mixing for 8.5 hours under the condition that the rotating speed is 10rpm, and obtaining a powder material, wherein the atomized spherical Mg powder, the Mg-5% Zn powder and the Mg-15% Gd powder are purchased from Weihao magnesium powder Co., Ltd in Tangshan, and the purity of the Mg powder is 99.8 wt%;
placing the powder material in a powder screening box, introducing argon gas into the powder screening box, screening the powder material when the oxygen content is 7500ppm, wherein the screened particle size is 55 microns, and screening out powder with the particle size larger than 55 microns and impurities to obtain pretreated powder;
step three, referring to fig. 1, preparing the medical magnesium alloy from the pretreatment powder by adopting a selective laser melting method, wherein the selective laser melting method has the following conditions: the laser power is 75W, the scanning speed is 200mm/s, the scanning interval is 40 μm, the powder layer thickness is 40 μm, the interlayer rotation angle is 67 degrees, the spot diameter is 70 μm, and the fan circulation frequency is 20 Hz.
Example 2
The embodiment of the application provides a medical magnesium alloy, and the chemical formula of the medical magnesium alloy is Mg-1% Zn-0.5% Gd.
The preparation method of the medical magnesium alloy comprises the following steps:
weighing atomized spherical Mg powder, Mg-5% Zn powder and Mg-15% Gd powder according to the raw material ratio, mechanically mixing for 8 hours under the condition that the rotating speed is 15rpm, and obtaining a powder material, wherein the atomized spherical Mg powder, the Mg-5% Zn powder and the Mg-15% Gd powder are purchased from Weihao Mg powder Co., Ltd in Tangshan, and the purity of the Mg powder is 99.8 wt%;
placing the powder material in a powder screening box, introducing argon gas into the powder screening box, screening the powder material when the oxygen content is 8000ppm, wherein the screened particle size is 60 microns, and screening out powder with the particle size larger than 60 microns and impurities to obtain pretreated powder;
step three, referring to fig. 1, preparing the medical magnesium alloy from the pretreatment powder by adopting a selective laser melting method, wherein the selective laser melting method has the following conditions: the laser power is 70W, the scanning speed is 350mm/s, the scanning interval is 42 mu m, the powder layer spreading thickness is 50 mu m, the interlayer rotation angle is 67 degrees, the spot diameter is 70 mu m, and the fan circulation frequency is 25 Hz.
Example 3
The embodiment of the application provides a medical magnesium alloy, and the chemical formula of the medical magnesium alloy is Mg-1% Zn-1% Gd.
The preparation method of the medical magnesium alloy comprises the following steps:
step one, weighing atomized spherical Mg powder, Mg-5% Zn powder and Mg-15% Gd powder according to the raw material ratio, mechanically mixing for 7.5 hours under the condition that the rotating speed is 20rpm, and obtaining a powder material, wherein the atomized spherical Mg powder, the Mg-5% Zn powder and the Mg-15% Gd powder are purchased from Weihao magnesium powder Co., Ltd in Tangshan, and the purity of the Mg powder is 99.8 wt%;
placing the powder material in a powder screening box, introducing argon gas into the powder screening box, screening the powder material when the oxygen content is 8500ppm, wherein the screened particle size is 60 mu m, and screening out powder with the particle size larger than 60 mu m and impurities to obtain pretreated powder;
step three, referring to fig. 1, preparing the medical magnesium alloy from the pretreatment powder by adopting a selective laser melting method, wherein the selective laser melting method has the following conditions: the laser power is 60W, the scanning speed is 400mm/s, the scanning interval is 45 mu m, the powder layer spreading thickness is 60 mu m, the interlayer rotation angle is 67 degrees, the spot diameter is 70 mu m, and the fan circulation frequency is 35 Hz.
In order to better illustrate the technical solution of the present invention, further comparison is made below by means of a comparative example and an example of the present invention.
Comparative example 1
The comparative example provides a medical magnesium alloy having a chemical formula of Mg-1% Z.
The preparation method of the medical magnesium alloy comprises the following steps:
step one, weighing atomized spherical Mg powder and Mg-5% Zn powder according to the raw material ratio, and mechanically mixing for 8 hours at the rotating speed of 15rpm to obtain a powder material, wherein the atomized spherical Mg powder and the Mg-5% Zn powder are purchased from Weihao magnesium powder of Tangshan, Inc., and the purity of the Mg powder is 99.8 wt%;
placing the powder material in a powder screening box, introducing argon gas into the powder screening box, screening the powder material when the oxygen content is 8000ppm, wherein the screened particle size is 60 microns, and screening out powder with the particle size larger than 60 microns and impurities to obtain pretreated powder;
step three, referring to fig. 1, preparing the medical magnesium alloy from the pretreatment powder by adopting a selective laser melting method, wherein the selective laser melting method has the following conditions: the laser power is 70W, the scanning speed is 350mm/s, the scanning interval is 42 mu m, the powder layer spreading thickness is 50 mu m, the interlayer rotation angle is 67 degrees, the spot diameter is 70 mu m, and the fan circulation frequency is 25 Hz.
Comparative example 2
The embodiment of the application provides a medical magnesium alloy, and the chemical formula of the medical magnesium alloy is Mg-1% Zn-2% Gd.
The preparation method of the medical magnesium alloy is as described in embodiment 2, and is not described again.
In order to better illustrate the characteristics of the medical magnesium alloy provided by the embodiment of the invention, the magnesium alloys prepared in the embodiments 1 to 3 and the comparative examples 1 to 2 are subjected to performance tests.
Test example 1 Corrosion Rate
After the magnesium alloys prepared in examples 1-3 and comparative examples 1-2 were immersed in a simulated body fluid with a concentration of 1 time for 72 hours, the corrosion rate change trend within 72 hours was measured, and the results are shown in fig. 2, and the average corrosion rate results after 72 hours are shown in table 1.
TABLE 1
| Average weight loss rate/(mg/cm)2/day) | |
| Example 1 | 16.527 |
| Example 2 | 14.933 |
| Example 3 | 16.131 |
| Comparative example 1 | 25.872 |
| Comparative example 2 | 33.102 |
As can be seen from FIG. 2 and Table 1, the degradation rates of examples 1 to 3, in which a proper amount of Ga element was added, were all improved to some extent as compared with comparative example 1, and the degradation rate of example 2 was 14.933mg/cm at the slowest2Day, 42.3% slower than comparative example 1.
As can be seen from FIG. 2 and Table 1, the addition amount of the rare earth element Ga is too much as compared with comparative example 2, resulting in Mg being produced5The Gd rare earth phase is increased, and the corrosion effect on the matrix is accelerated.
Test example 2 microstructure
The magnesium alloy prepared in example 2 was examined by SEM and TEM, and the examination results are shown in fig. 3 and 4, respectively.
As can be seen from FIGS. 3 and 4, the metallographic structure of the medical magnesium alloy prepared in example 2 consisted of an α -Mg matrix and a granular rare earth Mg phase precipitated along the grain boundaries5Gd composition, grain size of alpha-Mg matrix less than 1 μm, produced Mg5The size of Gd rare earth phase is about 100 nm. Therefore, the medical magnesium alloy prepared by the method has the advantages of fine grain structure, good mechanical property and no casting defects such as shrinkage porosity and the like.
Example 1 and example 3 each achieve substantially the same technical effect as example 2, i.e., have the same microstructure.
Test example 3 mechanical Properties
The magnesium alloy prepared in the embodiment 2 is subjected to mechanical property and density detection, the compressive strength is 377.73MPa, and the density is 98.52%, so that the medical magnesium alloy prepared by the method has good mechanical property and meets the requirement of internal fixation.
The detection method of the compressive strength comprises the following steps:
GB/T7314 and 2005 metallic material room temperature compression test method, SLM shape 4mm x 8mm cuboid sample, in the compression testing machine to measure the material compression strength, to the compressor matching software input sample length and width size, the machine according to the sample can bear the maximum compression force automatically calculate its compression strength.
The density testing method comprises the following steps:
GB/T1423-. The density calculation formula is as follows:
η＝ρpractice of/ρTheory of the invention
In the formula, ρPractice ofFor the actual measured density of the magnesium alloy, pTheory of the inventionIs the theoretical density of Mg-1% Zn-0.5% Gd alloy, and 1.76g/cm is taken3。
Examples 1 and 3 achieved substantially the same compressive strength and compactness, respectively, as example 2.
Test example 4 particle size distribution
The powder material obtained in the first step of example 2 was analyzed for particle size distribution, and the results are shown in fig. 5, and it can be seen from fig. 5 that the particle size of the powder material was in the range of 15 μm to 53 μm.
The particle size of the magnesium alloy is within the range of 15-53 mu m by adopting specific raw materials, and a foundation is provided for preparing the medical magnesium alloy by adopting a selective laser melting method.
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 or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A medical magnesium alloy is characterized in that: the chemical formula of the medical magnesium alloy is Mg-1% Zn-x% Gd, wherein x is 0.25-1.
2. The medical magnesium alloy according to claim 1, wherein: the chemical formula of the medical magnesium alloy is Mg-1% Zn-0.5% Gd.
3. A preparation method of medical magnesium alloy is characterized by comprising the following steps: at least comprises the following steps:
firstly, weighing atomized spherical Mg powder, Mg-5% Zn powder and Mg-15% Gd powder according to the raw material proportion of any one of claims 1-2, and mechanically mixing to obtain a powder material;
secondly, introducing inert gas, and screening the powder material when the oxygen content is less than 7000ppm to obtain pretreated powder;
step three, preparing the medical magnesium alloy from the pretreatment powder by adopting a selective laser melting method, wherein the selective laser melting method has the following conditions: the laser power is 60W-75W, and the scanning speed is 200 mm/s-400 mm/s.
4. The method for preparing the medical magnesium alloy according to claim 3, wherein the method comprises the following steps: in the third step, the laser power is 70W, and the scanning speed is 350 mm/s.
5. The method for preparing the medical magnesium alloy according to claim 3, wherein the method comprises the following steps: in the third step, the conditions of the selective laser melting method further include: the scanning interval is 40-45 μm, the powder layer thickness is 40-60 μm, the interlayer rotation angle is 67 degrees, the spot diameter is 70 μm, and the fan circulation frequency is 20-35 Hz.
6. The method for preparing the medical magnesium alloy according to claim 5, wherein the method comprises the following steps: the scanning distance is 42 mu m, the thickness of the powder spreading layer is 50 mu m, and the circulating frequency of the fan is 25 Hz.
7. The method for preparing the medical magnesium alloy according to claim 3, wherein the method comprises the following steps: in the first step, the mechanical mixing conditions are as follows: the rotating speed is 10 rpm-20 rpm, and the time is 7.5 h-8.5 h.
8. The method for preparing the medical magnesium alloy according to claim 3, wherein the method comprises the following steps: in the second step, the aperture adopted by the screening is 55-60 μm.
9. The method for preparing the medical magnesium alloy according to claim 3, wherein the method comprises the following steps: the inert gas is argon or nitrogen.
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