CN-121972814-A - Laser ablation micro-texture of cobalt-chromium-molybdenum alloy, and preparation method and application thereof

CN121972814ACN 121972814 ACN121972814 ACN 121972814ACN-121972814-A

Abstract

The invention discloses a cobalt-chromium-molybdenum alloy laser ablation micro-texture, a preparation method and application thereof, and aims at solving the problems that the surface micro-texture of the cobalt-chromium-molybdenum alloy is imperfect in laser ablation rule, surface defects are prone to existing in laser processing and the like. The method provided by the invention has the characteristics of more conveniently finding out proper technological parameters, ensuring that the processing size accords with the expected design, ensuring that the internal processing of the micro-texture is sufficiently smooth, ensuring that the surface roughness is low, ensuring that the surface quality is high and the like, and can be used in the technical field of preparing the micro-texture on the surface of metal or alloy.

Inventors

HU YAHUI
ZHANG HAOTIAN
LIU SHUHONG
CAI WEI
ZHOU JINQUAN
LIU BOLUN
DENG GUIRU
CHEN YA

Assignees

嘉思特医疗器材(天津)股份有限公司
天津理工大学

Dates

Publication Date: 20260505
Application Date: 20251219

Claims (10)

1. A method for preparing a laser ablation micro-texture of cobalt-chromium-molybdenum alloy, which is characterized by comprising the following steps: Step 1, determining a single pulse ablation threshold value of cobalt-chromium-molybdenum alloy to be processed by an area extrapolation method, and then calculating laser power corresponding to the single pulse ablation threshold value under different pulse frequencies to reduce the occurrence of the problems of non-ideal follow-up experiments and the like caused by overlarge or undersize laser energy density; step 2, designing an orthogonal experiment, carrying out surface micro-texture processing on the cobalt-chromium-molybdenum alloy to be processed by taking pulse frequency, scanning speed, scanning times and laser power obtained in the step 1 as laser processing parameters as factors, and selecting a micro-texture meeting the expected depth and low bottom roughness, wherein the laser processing parameters corresponding to the micro-texture are taken as optimal laser processing parameters; And 3, processing the cobalt-chromium-molybdenum alloy to be processed by adopting the optimal laser processing technological parameters in the step 2, and then performing fluid polishing on the surface of the cobalt-chromium-molybdenum alloy to obtain the micro-texture of the surface of the cobalt-chromium-molybdenum alloy, wherein the edge of the micro-texture is free from melt accumulation and the interior of the micro-texture is smooth through fluid polishing.
2. The method according to claim 1, wherein in the step 3, the surface micro-texture of the cobalt-chromium-molybdenum alloy has a bottom roughness Ra of 0.05 μm or less.
3. The preparation method according to claim 1, characterized in that it comprises the following steps: Step a, cutting a cobalt-chromium-molybdenum alloy rod to form a disc-shaped sample, preprocessing the disc-shaped sample to obtain a cobalt-chromium-molybdenum alloy to be processed, drawing a single-pulse ablation experiment drawing, guiding the drawing into a laser marking machine, performing a single-pulse ablation experiment on the cobalt-chromium-molybdenum alloy to be processed, calculating a single-pulse ablation threshold value of the cobalt-chromium-molybdenum alloy to be processed through an area extrapolation method, and calculating laser powers corresponding to the single-pulse ablation threshold values under different pulse frequencies; Step b, designing an orthogonal experiment, carrying out surface micro-texture processing on the cobalt-chromium-molybdenum alloy surface to be processed by taking pulse frequency, scanning speed, scanning times and the laser power calculated in the step a as factors to obtain a plurality of groups of initial cobalt-chromium-molybdenum alloy surface micro-textures, observing and measuring sample surface data by using a scanning electron microscope and a white light interferometer, and selecting laser processing technological parameters corresponding to the micro-textures with depth and bottom roughness meeting processing requirements as optimal laser processing technological parameters by comparing the depth and bottom roughness of the selected cobalt-chromium-molybdenum alloy surface micro-textures; and c, processing the cobalt-chromium-molybdenum alloy to be processed by adopting the optimal laser processing technological parameters in the step b, and then performing fluid polishing on the surface of the cobalt-chromium-molybdenum alloy to obtain the micro-texture of the surface of the cobalt-chromium-molybdenum alloy.
4. The method according to claim 3, wherein in the step a, the pretreatment is performed by performing ultrasonic cleaning and drying, grinding, ultrasonic cleaning and drying again on the disc-shaped sample, and the surface roughness Ra of the disc-shaped sample after pretreatment is less than or equal to 0.1 μm.
5. The method of claim 3, wherein in the step a, when the distance m between the centers of two laser pulse spots is greater than or equal to the diameter d of the spot, the single pulse ablation is realized by controlling the scan speed and the pulse frequency to control the coincidence rate of the spot, and the formula of the coincidence rate of the spot is as follows: Wherein eta is the superposition ratio of the light spots, v is the laser scanning speed, f is the pulse frequency, and d is the diameter of the light spots.
6. A method according to claim 3, wherein in step a, the area extrapolation uses the formula: Wherein D is the diameter of a single pulse ablation damage pit, omega 0 is the radius of a laser spot, E P is the energy of a laser pulse, and phi th is the single pulse ablation threshold of the cobalt-chromium-molybdenum alloy to be processed.
7. The preparation method according to claim 3, wherein in the step b, the laser power calculated in the step a is 4-10W, and 4W, 6W, 8W and 10W are respectively taken as the level, and an orthogonal experiment is designed.
8. The method according to claim 3, wherein in the step C, the abrasive is diamond, the abrasive grain size is 0.5-2 μm, the abrasive mass fraction is 40% -60%, the pressure is 2-4MPa, the flow mode is bidirectional reciprocating flow, the temperature is 20-30 ℃, and the fluid polishing process is carried out by matching with a white light interferometer to repeatedly observe, so that the micro-texture is not damaged, no melt is accumulated at the edge of the micro-texture, and the roughness Ra of the inner and outer surfaces of the micro-texture is less than or equal to 0.05 μm.
9. The laser ablated microtexture of a cobalt chromium molybdenum alloy obtained by the method of any one of claims 1 to 8.
10. Use of a laser ablated microtexture of a cobalt chromium molybdenum alloy according to claim 9 in biomedical science.

Description

Laser ablation micro-texture of cobalt-chromium-molybdenum alloy, and preparation method and application thereof Technical Field The invention relates to the technical field of metal or alloy surface micro-texture preparation, in particular to a cobalt-chromium-molybdenum alloy laser ablation micro-texture and a preparation method and application thereof. Background The cobalt-chromium-molybdenum alloy has excellent tribological performance, higher corrosion resistance and good biocompatibility, is widely applied in the field of biomedical materials, and has been widely applied to artificial joints, spines, artificial denture repair or replacement and the like. Once implanted in the body, the cobalt-chromium-molybdenum joint is continuously worn and corroded, so that the tribological performance of the cobalt-chromium-molybdenum alloy is improved, and the safety and the service life of the medical implant can be further improved. Through a great deal of researches, domestic and foreign scholars find that the surface micro-texture is prepared on the cobalt-chromium-molybdenum alloy to improve the tribological performance of the cobalt-chromium-molybdenum alloy and further prolong the service life of the artificial joint, the current researches gather on the influences of the type, shape and size parameters of the surface micro-texture of the cobalt-chromium-molybdenum alloy on friction and abrasion, and part of articles make specific requirements on the size parameters of the micro-texture such as depth, spacing, aspect ratio and the like of the micro-texture, but the research on how to process the micro-texture with the specific requirements on the surface of the cobalt-chromium-molybdenum alloy is not perfect at present. The current method for processing the surface micro-texture mainly comprises laser processing, electric spark processing, micro-milling processing, mechanical vibration processing, electrolytic processing technology and the like. Among them, laser processing is the most widely used method at present because of its advantages of non-contact, maskless, precise processing, and fast speed. When the surface micro-texture is processed by laser, the micro-texture is controlled by laser process parameters, the geometric parameters of the surface micro-texture are directly affected by the selection of different laser parameters, the photo-thermal properties of the surfaces of different materials are different, the optimal laser process parameters determined on one material cannot be simply applied to the other material, and meanwhile, the laser processing is easy to have larger surface quality problems, such as melt recasting bulges, rough processing edges and the like. Disclosure of Invention The invention aims at solving the technical defects that the laser processing rule of the micro-texture on the surface of the cobalt-chromium-molybdenum alloy is imperfect and the laser processing is easy to have larger surface quality, and provides a preparation method of the laser ablation micro-texture of the cobalt-chromium-molybdenum alloy. Another object of the invention is to provide a laser ablated microtexture of the cobalt chromium molybdenum alloy obtained by the above preparation method. It is another object of the present invention to provide the use of laser ablated microtexture of the cobalt chromium molybdenum alloys described above in biomedical applications. The technical scheme adopted for realizing the purpose of the invention is as follows: a method for preparing a laser ablation micro-texture of cobalt-chromium-molybdenum alloy, which comprises the following steps: Step 1, determining a single pulse ablation threshold value of cobalt-chromium-molybdenum alloy to be processed by an area extrapolation method, and then calculating laser power corresponding to the single pulse ablation threshold value under different pulse frequencies to reduce the occurrence of the problems of non-ideal follow-up experiments and the like caused by overlarge or undersize laser energy density; step 2, designing an orthogonal experiment, carrying out surface micro-texture processing on the cobalt-chromium-molybdenum alloy to be processed by taking pulse frequency, scanning speed, scanning times and laser power obtained in the step 1 as laser processing parameters as factors, and selecting a micro-texture meeting the expected depth and low bottom roughness, wherein the laser processing parameters corresponding to the micro-texture are taken as optimal laser processing parameters; And 3, processing the cobalt-chromium-molybdenum alloy to be processed by adopting the optimal laser processing technological parameters in the step 2, and then performing fluid polishing on the surface of the cobalt-chromium-molybdenum alloy to obtain the micro-texture of the surface of the cobalt-chromium-molybdenum alloy, wherein the edge of the micro-texture is free from melt accumulation and the interior of the micro-texture is sm