CN112111672A - Medical cobalt-based alloy guide needle material and preparation method thereof - Google Patents

Medical cobalt-based alloy guide needle material and preparation method thereof Download PDF

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CN112111672A
CN112111672A CN202010948795.4A CN202010948795A CN112111672A CN 112111672 A CN112111672 A CN 112111672A CN 202010948795 A CN202010948795 A CN 202010948795A CN 112111672 A CN112111672 A CN 112111672A
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chromium
molybdenum
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尹权丰
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Shenyang Zhjh Special Metal Materials Co ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C19/00Alloys based on nickel or cobalt
    • C22C19/07Alloys based on nickel or cobalt based on cobalt
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS 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
    • A61L31/00Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/02Inorganic materials
    • A61L31/022Metals or alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/02Making non-ferrous alloys by melting
    • C22C1/03Making non-ferrous alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C27/00Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/06Alloys based on chromium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/10Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
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Abstract

The invention relates to the technical field of biomedical metal material products, in particular to a medical cobalt-based alloy guide needle material and a preparation method thereof, which comprises a high-purity metal chromium block, the high-purity metal chromium block, a high-purity metal molybdenum strip and pure rare earth are placed into a smelting feed box, then a furnace door is sealed, the high vacuum pumping is carried out, the discharging is started to be molten, the feeding is carried out while the melting is carried out, cast ingots are cooled, high-purity electrolytic cobalt, the high-purity metal chromium block and chromium-molybdenum intermediate alloy are added into a furnace in layers, the furnace door is closed, the vacuum pumping is carried out, a die forging blank is carried out on a large-tonnage die forging machine, the alloy is rotationally forged into a bar for mold finishing, the numerical control automatic processing is carried out according to the specification of guide needles, the polishing treatment, the surface disinfection and packaging and warehousing are carried out, in the invention, the chromium-molybdenum intermediate alloy is added with molybdenum, and trace rare earth elements capable of, thereby effectively ensuring the quality of the medical cobalt-based alloy guide needle material.

Description

Medical cobalt-based alloy guide needle material and preparation method thereof
Technical Field
The invention relates to the technical field of biomedical metal material products, in particular to a medical cobalt-based alloy guide needle material and a preparation method thereof.
Background
Medical cobalt-based materials are the most important alloys for manufacturing long-term implants which bear severe loads on the human body and have high requirements on wear resistance. The method is widely applied to the manufacturing of artificial joints such as hip joints, knee joints and the like. And is one of biomedical materials with an earlier history of use. In the early stage, artificial joints are manufactured by casting and powder metallurgy methods, and recently forged CoCrMo and CoCrNiMo also show good service performance.
The excellent energy source of the medical cobalt-based alloy is the crystallography characteristic of a cobalt matrix, and the solid solution strengthening effect of chromium and molybdenum form carbide hardening similarity and corrosion resistance generated by chromium. The cobalt-based alloy has low phase change free energy, and can obtain a complex phase structure through the micro adjustment and plastic processing of alloy components, thereby improving the mechanical property. A medical guide needle and a bone needle belong to slender products, are stressed complexly, and need to have high strength and wear resistance, good plasticity and elasticity and good processability. The traditional cobalt-chromium-molybdenum alloy has high hardness, the plasticity is reduced too much along with the increase of the strength, the smelting of a cobalt-chromium-molybdenum alloy ingot is mainly carried out by a vacuum induction furnace at home and abroad, an alkaline oxide crucible or a neutral crucible is used, the influence of the pollution of crucible materials is inevitable, and the impurity components are difficult to control. On the other hand, the high melting point (2820 ℃) of molybdenum in the cobalt-chromium-molybdenum alloy is easy to generate incomplete melting and inclusion, and the quality of cast ingots is seriously influenced, so that a medical cobalt-based alloy guide needle material and a preparation method thereof are provided for solving the problems.
Disclosure of Invention
The invention aims to provide a medical cobalt-based alloy guide needle material and a preparation method thereof, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a medical cobalt-based alloy guide needle material comprises a high-purity metal chromium block, a high-purity metal molybdenum strip and pure rare earth, wherein the high-purity metal chromium block, the high-purity metal molybdenum strip and the pure rare earth are prepared and treated.
A preparation method of a medical cobalt-based alloy guide needle material comprises the following steps:
the method comprises the following steps: production of the chromium-molybdenum intermediate alloy: casting a chromium-molybdenum intermediate alloy: putting a high-purity metal chromium block, a high-purity metal molybdenum strip and pure rare earth into a smelting feed box, then sequentially carrying out processes of furnace door sealing, vacuumizing, discharging to start melting, feeding while melting, ingot casting cooling, ingot casting room temperature vacuum breaking, discharging and the like, then sampling a chromium-molybdenum intermediate alloy ingot casting, analyzing chemical components, crushing by adopting a turning or planing method, and barreling for later use;
step two: production of a CoCrMo alloy ingot: the production treatment is carried out by adopting a water-cooled copper crucible vacuum induction furnace, high-purity electrolytic cobalt, high-purity metal chromium blocks and chromium-molybdenum intermediate alloy are weighed according to design components, then are uniformly mixed and added into the furnace in layers, a furnace door is closed for vacuumizing, power is supplied when the vacuum degree reaches below 3Pa, large current is used for melting furnace burden, after the furnace burden is completely melted, the current is reduced to about 60% of the current during melting, molten metal is refined, and degassing is carried out; reducing the smelting current every 10 minutes, reducing the smelting current to about 30 percent in a gradient manner, and controlling the refining time to be between 30 and 45 minutes; adjusting the temperature of the metal liquid to a proper temperature, casting the metal liquid into an ingot casting mold, and solidifying and cooling the metal liquid; cooling the cast ingot to room temperature, breaking vacuum, opening a furnace door, and taking out the cast ingot; sampling the cast ingot, analyzing chemical components, turning and peeling the surface of the cast ingot, and removing a riser;
step three: manufacturing a cobalt-chromium-molybdenum alloy superfine rod: forging and cogging on a large-tonnage die forging machine, heating in an electric furnace at 1150-1250 ℃ and keeping the temperature for more than 0.5 hour; the pass forging deformation rate is below 20%, repeated heating and forging are needed, the die forging is carried out until the diameter phi is about 20, and the die forging is used as a blank of the next process and is checked and polished; then, carrying out precision forging processing by using a hot rotary swaging machine independently manufactured by enterprises, and carrying out multi-pass rotary swaging processing to obtain a finished product of an ultra-thin straight rod with the diameter of phi 2.0-3.0 mm, and then annealing in a vacuum annealing furnace at the temperature of 750-;
step four: manufacturing a cobalt-chromium-molybdenum alloy guide needle: performing mold polishing on the rotary-forging alloy finished bar, performing flaw detection inspection, performing numerical control automatic processing according to the specification of the guide pin, performing polishing treatment, performing surface disinfection, packaging and warehousing.
Preferably, the chromium-molybdenum intermediate alloy is fused and cast by using a vacuum electron beam furnace in the step one.
Preferably, the purity of the high-purity metal chromium block is more than 99.90 percent, the purity of the high-purity metal molybdenum strip is more than 99.90 percent, the purity of the pure rare earth is more than 99.95 percent, and the purity of the electrolytic cobalt is more than 99.90 percent.
Preferably, the composition range (mass percent) of the intermediate alloy in the first step is 40-45 percent of molybdenum, 0.05 percent of rhenium, less than 0.015 percent of carbon, less than 0.05 percent of silicon and the balance of chromium.
Preferably, the control range (mass percent) of the components of the ingot casting in the second step is 27.50-29.00 percent of chromium, 5.01-6.99 percent of molybdenum, less than 0.70 percent of nickel, less than 0.50 percent of iron, less than 0.50 percent of manganese, less than 0.15 percent of silicon and less than 0.0010 percent of sulfur.
Preferably, the parameters of the hot rotary swaging machine manufactured independently in the middle of the three steps are as follows: main shaft rotation speed 1200/min, feeding speed 1.5-2 m/min, heating furnace temperature: 850-980 ℃, pass processing rate: 12 to 17 percent.
Preferably, the mechanical properties of the guide pin made of the cobalt-chromium-molybdenum alloy are as follows: tensile strength (MPa) 890-980, yield strength (MPa) 860-890, elongation 8.0-11.0%, reduction of area 17.0-18.9%, and fatigue strength 700-750 MPa.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, molybdenum is added into the chromium-molybdenum intermediate alloy, and trace rare earth elements capable of refining grains are added in the process of manufacturing the chromium-molybdenum intermediate alloy, so that the quality of the medical cobalt-based alloy guide needle material is effectively ensured.
Detailed Description
Example 1: the invention provides a technical scheme that:
a medical cobalt-based alloy guide needle material comprises a high-purity metal chromium block, a high-purity metal molybdenum strip and pure rare earth, wherein the high-purity metal chromium block, the high-purity metal molybdenum strip and the pure rare earth are prepared and treated.
The preparation method comprises the following steps:
the method comprises the following steps: production of the chromium-molybdenum intermediate alloy: casting a chromium-molybdenum intermediate alloy: putting a high-purity metal chromium block, a high-purity metal molybdenum strip and pure rare earth into a smelting feed box, then sequentially carrying out processes of furnace door sealing, vacuumizing, discharging to start melting, feeding while melting, ingot casting cooling, ingot casting room temperature vacuum breaking, discharging and the like, then sampling a chromium-molybdenum intermediate alloy ingot casting, analyzing chemical components, crushing by adopting a turning or planing method, and barreling for later use;
step two: production of a CoCrMo alloy ingot: the production treatment is carried out by adopting a water-cooled copper crucible vacuum induction furnace, high-purity electrolytic cobalt, high-purity metal chromium blocks and chromium-molybdenum intermediate alloy are weighed according to design components, then are uniformly mixed and added into the furnace in layers, a furnace door is closed for vacuumizing, power is supplied when the vacuum degree reaches below 3Pa, large current is used for melting furnace burden, after the furnace burden is completely melted, the current is reduced to about 60% of the current during melting, molten metal is refined, and degassing is carried out; reducing the smelting current every 10 minutes, reducing the smelting current to about 30 percent in a gradient manner, and controlling the refining time to be between 30 and 45 minutes; adjusting the temperature of the metal liquid to a proper temperature, casting the metal liquid into an ingot casting mold, and solidifying and cooling the metal liquid; cooling the cast ingot to room temperature, breaking vacuum, opening a furnace door, and taking out the cast ingot; sampling the cast ingot, analyzing chemical components, turning and peeling the surface of the cast ingot, and removing a riser;
step three: manufacturing a cobalt-chromium-molybdenum alloy superfine rod: forging and cogging on a large-tonnage die forging machine, heating in an electric furnace at 1150-1250 ℃ and keeping the temperature for more than 0.5 hour; the pass forging deformation rate is below 20%, repeated heating and forging are needed, the die forging is carried out until the diameter phi is about 20, and the die forging is used as a blank of the next process and is checked and polished; then, carrying out precision forging processing by using a hot rotary swaging machine independently manufactured by enterprises, and carrying out multi-pass rotary swaging processing to obtain a finished product of an ultra-thin straight rod with the diameter of phi 2.0-3.0 mm, and then annealing in a vacuum annealing furnace at the temperature of 750-;
step four: manufacturing a cobalt-chromium-molybdenum alloy guide needle: performing mold polishing on the rotary-forging alloy finished bar, performing flaw detection inspection, performing numerical control automatic processing according to the specification of the guide pin, performing polishing treatment, performing surface disinfection, packaging and warehousing.
In the first step, a vacuum electron beam furnace is adopted to cast a chromium-molybdenum intermediate alloy, the furnace type high vacuum high current density smelting is adopted, the cast ingot is solidified in a water-cooled copper crucible, the crucible pollution is avoided, the purity of a high-purity metal chromium block is more than 99.90%, the purity of a high-purity metal molybdenum strip is more than 99.90%, the purity of pure rare earth is more than 99.95%, and the purity of electrolytic cobalt is more than 99.90%, so that the quality of the raw material is ensured, and the quality of the finished product is ensured, wherein in the first step, the range of the intermediate alloy components (mass percentage) is 40-45% of molybdenum, 0.05% of rhenium, less than 0.015% of carbon, less than 0.05% of silicon, and the balance of chromium, in the second step, the range of the cast ingot components (mass percentage) is 27.50-29.00% of chromium, 5.01-6.99% of molybdenum, less than 0.70% of nickel, less than 0.50% of iron, less than 0.50% of manganese, less than 0.: main shaft rotation speed 1200/min, feeding speed 1.5-2 m/min, heating furnace temperature: 850-980 ℃, pass processing rate: 12-17%, and the mechanical properties of the cobalt-chromium-molybdenum alloy guide pin are as follows: the tensile strength (MPa) 890-980, the yield strength (MPa) 860-890, the elongation of 8.0-11.0%, the reduction of area of 17.0-18.9%, and the fatigue strength of 700-750MPa, which effectively ensures the quality of product production.
According to the invention, molybdenum is added into the chromium-molybdenum intermediate alloy, and trace rare earth elements capable of refining grains are added in the process of manufacturing the chromium-molybdenum intermediate alloy, so that the quality of the medical cobalt-based alloy guide needle material is effectively ensured.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.

Claims (8)

1. A medical cobalt-based alloy guide needle material comprises a high-purity chromium metal block, a high-purity molybdenum metal strip and pure rare earth, and is characterized in that: and preparing and treating the high-purity metal chromium block, the high-purity metal molybdenum strip and the pure rare earth.
2. The preparation method of the medical cobalt-based alloy guide needle material as claimed in claim 1, wherein the preparation method comprises the following steps: the method comprises the following steps:
the method comprises the following steps: production of the chromium-molybdenum intermediate alloy: casting a chromium-molybdenum intermediate alloy: putting a high-purity metal chromium block, a high-purity metal molybdenum strip and pure rare earth into a smelting feed box, then sequentially carrying out processes of furnace door sealing, vacuumizing, discharging to start melting, feeding while melting, ingot casting cooling, ingot casting room temperature vacuum breaking, discharging and the like, then sampling a chromium-molybdenum intermediate alloy ingot casting, analyzing chemical components, crushing by adopting a turning or planing method, and barreling for later use;
step two: production of a CoCrMo alloy ingot: the production treatment is carried out by adopting a water-cooled copper crucible vacuum induction furnace, high-purity electrolytic cobalt, high-purity metal chromium blocks and chromium-molybdenum intermediate alloy are weighed according to design components, then are uniformly mixed and added into the furnace in layers, a furnace door is closed for vacuumizing, power is supplied when the vacuum degree reaches below 3Pa, large current is used for melting furnace burden, after the furnace burden is completely melted, the current is reduced to about 60% of the current during melting, molten metal is refined, and degassing is carried out; reducing the smelting current every 10 minutes, reducing the smelting current to about 30 percent in a gradient manner, and controlling the refining time to be between 30 and 45 minutes; adjusting the temperature of the metal liquid to a proper temperature, casting the metal liquid into an ingot casting mold, and solidifying and cooling the metal liquid; cooling the cast ingot to room temperature, breaking vacuum, opening a furnace door, and taking out the cast ingot; sampling the cast ingot, analyzing chemical components, turning and peeling the surface of the cast ingot, and removing a riser;
step three: manufacturing a cobalt-chromium-molybdenum alloy superfine rod: forging and cogging on a large-tonnage die forging machine, heating in an electric furnace at 1150-1250 ℃ and keeping the temperature for more than 0.5 hour; the pass forging deformation rate is below 20%, repeated heating and forging are needed, the die forging is carried out until the diameter phi is about 20, and the die forging is used as a blank of the next process and is checked and polished; then, carrying out precision forging processing by using a hot rotary swaging machine independently manufactured by enterprises, and carrying out multi-pass rotary swaging processing to obtain a finished product of an ultra-thin straight rod with the diameter of phi 2.0-3.0 mm, and then annealing in a vacuum annealing furnace at the temperature of 750-;
step four: manufacturing a cobalt-chromium-molybdenum alloy guide needle: performing mold polishing on the rotary-forging alloy finished bar, performing flaw detection inspection, performing numerical control automatic processing according to the specification of the guide pin, performing polishing treatment, performing surface disinfection, packaging and warehousing.
3. The preparation method of the medical cobalt-based alloy guide needle material as claimed in claim 2, wherein the preparation method comprises the following steps: in the first step, a vacuum electron beam furnace is adopted to melt and cast the chromium-molybdenum intermediate alloy.
4. The preparation method of the medical cobalt-based alloy guide needle material as claimed in claim 2, wherein the preparation method comprises the following steps: the purity of the high-purity metal chromium block is more than 99.90 percent, the purity of the high-purity metal molybdenum strip is more than 99.90 percent, the purity of the pure rare earth is more than 99.95 percent, and the purity of the electrolytic cobalt is more than 99.90 percent.
5. The preparation method of the medical cobalt-based alloy guide needle material as claimed in claim 2, wherein the preparation method comprises the following steps: in the first step, the components of the intermediate alloy (mass percent) are 40-45% of molybdenum, 0.05% of rhenium, less than 0.015% of carbon, less than 0.05% of silicon and the balance of chromium.
6. The preparation method of the medical cobalt-based alloy guide needle material as claimed in claim 2, wherein the preparation method comprises the following steps: in the second step, the control range (mass percent) of the components of the cast ingot is 27.50-29.00 percent of chromium, 5.01-6.99 percent of molybdenum, less than 0.70 percent of nickel, less than 0.50 percent of iron, less than 0.50 percent of manganese, less than 0.15 percent of silicon and less than 0.0010 percent of sulfur.
7. The preparation method of the medical cobalt-based alloy guide needle material as claimed in claim 2, wherein the preparation method comprises the following steps: the equipment parameters of the hot rotary swaging machine manufactured independently in the middle-school industry of the step three are as follows: main shaft rotation speed 1200/min, feeding speed 1.5-2 m/min, heating furnace temperature: 850-980 ℃, pass processing rate: 12 to 17 percent.
8. The preparation method of the medical cobalt-based alloy guide needle material as claimed in claim 2, wherein the preparation method comprises the following steps: the mechanical properties of the guide pin made of the cobalt-chromium-molybdenum alloy are as follows: tensile strength (MPa) 890-980, yield strength (MPa) 860-890, elongation 8.0-11.0%, reduction of area 17.0-18.9%, and fatigue strength 700-750 MPa.
CN202010948795.4A 2020-09-10 2020-09-10 Medical cobalt-based alloy guide needle material and preparation method thereof Pending CN112111672A (en)

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CN113855099A (en) * 2021-10-26 2021-12-31 江苏盛玛特新材料科技有限公司 Superfine super-tough puncture needle and production method thereof
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