Production method of CoCrMo alloy for artificial joints

A technology for artificial joints and production methods, which is applied to the improvement of process efficiency, tissue regeneration, medical science and other directions, can solve the problems of successful forging without CoCrMo alloy ingots, and achieve the effect of improving production yield and high purity

Inactive Publication Date: 2019-08-16

KAILI UNIV

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Abstract

The invention relates to the field of cobalt-base alloys, in particular to a production method of a CoCrMo alloy for artificial joints. According to the method, at first, a forged blank is obtained bymeans of vacuum induction furnace smelting and electroslag remelting; then the blank is heated to 1150 DEG C-1250 DEG C for heat preserving, and then forging is carried out; in the forging process, the temperature of the blank is strictly controlled within a certain temperature range, the temperature preserved for the final heating number is 1150 DEG C, the temperature for final forging of each heating number is no lower than 1000 DEG C, and thus it is guaranteed that the CoCrMo forged blank is always in a good plastic processing state; and after forging, diffusion annealing treatment is carried out, and the annealing temperature ranges from 1000 DEG C to 1050 DEG C. According to the production method, the qualified CoCrMo forged blank is obtained through the production method, qualifiedraw materials are provided for manufacturing the artificial joint parts, the most important link for obtaining the raw materials of the qualified CoCrMo artificial joint parts is forging, and strict control over the temperature for initial forging and final forging is the most key part for ensuring that the high-quality products are obtained and the production yield is increased.

Application Domain

Increasing energy efficiencyTissue regeneration +1

Technology Topic

Artificial jointsCobalt based alloy +6

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Examples

Experimental program(4)

Example Embodiment

[0038] Example one:

[0039] In this embodiment, the production method of CoCrMo alloy for artificial joints includes the following steps:

[0040] 1) Use a pollution-free crucible for smelting in a vacuum induction furnace;

[0041] 2) When selecting materials, use metallic cobalt (Co99.8wt%), metallic chromium (Cr99.95wt%), Mo-1 metallic molybdenum in GB/T3462 and other raw materials for smelting; vacuum the furnace to 15Pa and start sending Power smelting, keep the vacuum at 25Pa during the smelting process, quickly increase the power to clear after the material turns red, and then maintain this high power to increase the bath temperature;

[0042] 3) Refining starts when the bath temperature reaches 1600°C, the refining time is 20min, and the vacuum degree during refining is 15Pa; then the nitrogen filling operation is carried out, the nitrogen filling pressure is 54KPa, the nitrogen filling time is 12min, and the nitrogen content is 0.10wt. %;

[0043] 4) The ternary slag is used for electroslag remelting in dry argon, and the composition of the ternary slag is CaF by weight percentage 2 : 70%, Al 2 O 3 : 25%, MgO: 5%.

[0044] In terms of mass percentage, the chemical composition of CoCrMo alloy for artificial joints is as follows: Cr29.0%, Mo6.0%, Ni0.05%, Fe0.03%, Mn0.06%, Nb0.01%, Si0.04%, O0.015%, C0.025%, N0.10%, Co balance.

[0045] 5) Using precision forging method: when the CoCrMo forging billet is cold loaded, the furnace temperature is 600°C, the heating rate is 50°C/h, and the temperature is raised to 1250°C. The forging billet is kept for 1 hour and then out of the furnace for forging. After each fire forging is completed , The forging billet is returned to the furnace and kept at 1250°C for 1 hour and then out of the furnace for forging. It is necessary to ensure that the deformation of each fire forging is 20%; the holding temperature of the forging billet in the last fire is 1150°C, and the holding time is controlled at 1 hour to ensure the final The deformation of one-fire forging is 25%; the final forging temperature of each fire should be controlled at 1000℃; when upsetting is not performed during the forging process, the specification of the electroslag mold selected should ensure that the subsequent forging ratio is 4.

[0046] 6) If cracks appear on the surface of the blank during the forging process, the forging should be stopped to repair the cracks and then continue forging.

[0047] 7) After completion of forging, the forging blank is subjected to diffusion annealing treatment at 1000°C, holding time for 1 hour, and air cooling to room temperature.

Example Embodiment

[0048] Embodiment two:

[0049] In this embodiment, the production method of CoCrMo alloy for artificial joints includes the following steps:

[0050] 1) Use a pollution-free crucible for smelting in a vacuum induction furnace;

[0051] 2) When selecting materials, use metallic cobalt (Co99.8wt%), metallic chromium (Cr99.95wt%), Mo-1 metallic molybdenum in GB/T3462 and other raw materials for smelting; vacuum the furnace to 14Pa and start sending Power smelting, maintain a vacuum of 24 Pa during the smelting process, and quickly increase the power to clear after the material turns red, and then maintain this high power to increase the temperature of the molten pool;

[0052] 3) Refining starts when the bath temperature reaches 1600℃, the refining time is 30min, and the vacuum degree during refining is 14Pa; after that, the nitrogen filling operation is carried out, the nitrogen filling pressure is 54KPa, the nitrogen filling time is 18min, and the nitrogen content is 0.18wt. %;

[0053] 4) The quaternary slag is used for electroslag remelting in dry argon. The composition of the quaternary slag is as follows: CaF 2 : 70%, Al 2 O 3 : 12%, CaO: 8%, MgO: 10%;

[0054] In terms of mass percentage, the chemical composition of CoCrMo alloy for artificial joints is as follows: Cr28.0%, Mo6.5%, Ni0.08%, Fe0.05%, Mn0.04%, Nb0.06%, Si0.03%, O0.012%, C0.035%, N0.18%, Co balance.

[0055] 5) Adopt fast forging method: when the CoCrMo forging billet is cold loaded, the furnace temperature is 580°C, the heating rate is 48°C/h, and the temperature is raised to 1250°C. The forging billet is held for 2 hours and then out of the furnace for forging. Each forging is completed. After that, the forging billet is returned to the furnace to continue holding at 1250°C for 2 hours and then out of the furnace for forging. It is necessary to ensure that the deformation of each fire forging is 18%; the holding temperature of the forging billet in the last fire is 1150°C, and the holding time is controlled at 2 hours to ensure The deformation of the last fire forging is 24%; the final forging temperature of the billet for each fire is 1050°C. When the upsetting operation is not performed during the forging process, the electroslag crystallizer specification selected should ensure that the subsequent forging ratio is 5.

[0056] 6) If cracks appear on the surface of the blank during the forging process, the forging should be stopped to repair the cracks and then continue forging.

[0057] 7) After the forging is completed, the forging blank is subjected to diffusion annealing treatment at 1050°C, holding time for 2 hours, and air cooling to room temperature.

Example Embodiment

[0058] Example three:

[0059] In this embodiment, the production method of CoCrMo alloy for artificial joints includes the following steps:

[0060] 1) Use a pollution-free crucible for smelting in a vacuum induction furnace;

[0061] 2) When selecting materials, use metallic cobalt (Co99.8wt%), metallic chromium (Cr99.95wt%), Mo-1 metallic molybdenum in GB/T3462 and other raw materials for smelting; vacuum the furnace to 13Pa and start sending Power smelting, keep the vacuum at 23Pa during the smelting process, quickly increase the power to clear after the material turns red, and then keep this high power to increase the temperature of the molten pool;

[0062] 3) Refining starts when the bath temperature reaches 1600℃, the refining time is 25min, and the vacuum degree during refining is 13Pa; after that, the nitrogen filling operation is carried out, the nitrogen filling pressure is 54KPa, the nitrogen filling time is 14min, and the nitrogen content is 0.14wt. %;

[0063] 4) The ternary slag is used for electroslag remelting in dry argon, and the composition of the ternary slag is CaF by weight percentage 2 : 70%, Al 2 O 3 : 25%, MgO: 5%;

[0064] In terms of mass percentage, the chemical composition of CoCrMo alloy for artificial joints is as follows: Cr30.0%, Mo5.5%, Ni0.03%, Fe0.07%, Mn0.02%, Nb0.05%, Si0.04%, O0.024%, C0.018%, N0.14%, Co balance.

[0065] 5) Adopt free forging method: when the CoCrMo forging billet is cold loaded, the furnace temperature is 550°C, the heating rate is 45°C/h, the temperature is raised to 1250°C, the forging billet is held for 1.5 hours and then out of the furnace for forging. After completing each fire forging The forging billet is returned to the furnace and kept at 1250°C for 1.5 hours and then out of the furnace for forging. It is necessary to ensure that the deformation of each fire forging is 19%; the holding temperature of the forging billet in the last fire is 1150°C, and the holding time is controlled at 1.5 hours to ensure the final The deformation of one-fire forging is 23%; the final forging temperature of the billet for each fire is 1060℃. When upsetting is not performed during the forging process, the electroslag crystallizer specification selected should ensure that the subsequent forging ratio is 4.5.

[0066] 6) If cracks appear on the surface of the blank during the forging process, the forging should be stopped to repair the cracks and then continue forging.

[0067] 7) After forging is completed, the forging blank is subjected to diffusion annealing treatment at 1020°C, holding time for 1.5 hours, and air cooling to room temperature.

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Improve production yield
High purity

Production method of CoCrMo alloy for artificial joints

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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