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Laser microscopy processing method of porous surface structure

A technology of porous surface and processing method, which is applied in the field of micromachining of biomedical materials, can solve the problems of inability to position, loose and fall of implants, and unstable combination of metal-bone interface, etc., and achieve huge economic and social value.

Inactive Publication Date: 2010-01-27
SHENYANG POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Implants with higher mechanical properties will affect the surrounding bone tissue, because the implant bears most of the external force and produces stress shielding, so the surrounding bone tissue is prone to problems such as osteoporosis and bone resorption, and will also affect wound healing
The composition and properties of metal materials and bone tissue are very different. After the dense metal is implanted in the body, a fibrous tissue film is often formed between the bone tissue, and the new bone tissue is only on the surface, so that the metal-bone interface cannot be combined stably. It is the main reason that causes the implant to loosen and fall off and cannot be positioned, and even leads to implant failure.

Method used

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  • Laser microscopy processing method of porous surface structure
  • Laser microscopy processing method of porous surface structure
  • Laser microscopy processing method of porous surface structure

Examples

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Embodiment 1

[0042] In this embodiment, a continuous wave Nd:YAG solid-state laser is used to perform laser gas nitriding on 6061Al alloy. The base material is 6061Al alloy, and its chemical composition (wt%) is: 0.4-0.8 Si; 0.7 Fe; 0.15-0.4 Cu; 0.15 Mn; 0.8-1.2 Mg; 0.04-0.35 Cr; 0.25 Zn; 0.15 Ti; Al balance . Laser nitriding process parameters are: laser output power of 1000-1600W, focus of ZnSe lens with 100mm focal length, spot diameter of 1.5-2.5mm, scan rate of 10-35mm / s, nitrogen flow rate of reaction protection chamber of 10-20L / min, sample surface The overlapping rate of large-area laser nitriding treatment is 40-50%. After laser nitriding of 6061Al alloy, a nitrided modified layer with a thickness of 200-500 μm can be obtained on the surface, such as Figure 8 shown. Pulsed Nd:YAG solid-state laser is used for laser micromachining. The process parameters are: pulse power 5-8W, pulse frequency 5-10Hz, pulse number 3-6 times, pulse width 0.5-1ms, and the surface aperture can be o...

Embodiment 2

[0044] The modified layer of Ni-Al and Ti-Al intermetallic compounds can be prepared on the surface of 6061Al alloy by continuous wave high-power Nd-YAG laser. The base material is 6061Al alloy, and the NiTi alloy powder used for surface treatment is of industrial purity, and its chemical composition (at%) is: Ni: 50-54%, Ti: 46-50%. The surface of the 6061Al alloy is sandblasted and cleaned, the NiTi alloy is placed on the surface of the aluminum alloy, and the thickness of the alloy powder is preset on the surface of the aluminum alloy with a thickness of 0.2-0.7mm. A continuous wave Nd-YAG solid-state laser is used for laser cladding treatment, the laser beam wavelength is 1.06 μm, and the ZnSe lens is focused with a focal length of 100 mm. The parameters of the laser treatment process are: power 900-1800W, spot diameter 1-3mm, scanning speed 3-20mm / s, argon gas flow in the protection chamber 10-30L / min. The optimal laser processing parameters are: power 1600W, spot diamet...

Embodiment 3

[0046] In this embodiment, a continuous wave Nd:YAG solid-state laser is used to carry out laser gas nitriding on the surface of medical titanium alloy. The nitriding process parameters are as follows: laser output power is 500-700W, ZnSe lens focusing with 100mm focal length, spot diameter 1.5-2.0 mm, scan rate 5-8mm / s, reaction chamber nitrogen flow rate 10-20L / min, large-area laser nitriding treatment overlap rate of sample surface 40-50%, laser gas nitriding test device such as figure 1 As shown, after the material is nitridated by laser, laser micromachining is carried out with a pulsed Nd:YAG solid-state laser. The process parameters are: pulse power 8W, pulse frequency 10Hz, pulse number 4 times, and pulse width 1ms.

[0047] The large-area laser nitriding treatment on the surface of the sample has an overlapping rate of 50-80%; the ratio of the maximum diameter of the bottom of the micropore to the diameter of the hole is 1.3-1.8.

[0048] figure 2 , 3 , 4 is the c...

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Abstract

The invention discloses a laser microscopy processing method of a porous surface structure. Firstly, adopting a laser gas nitrogen treatment mode to perform surface treatment to a processed surface; then, performing laser microscopy processing. The invention has the advantages that the method can obtain an omega-shaped porous surface structure with wide application range, the porous surface structure can form certain array form or other arrangement forms satisfying using requirements, and the depth, ratio between depth and diameter, distribution density and the like of holes can be designed and adjusted according to using requirements. The invention has favourable characteristics of satisfying using requirements in medical fields and the like and has foreseeable huge economic value and social value.

Description

technical field [0001] The invention relates to the technical field of micromachining of biomedical materials, and in particular provides a laser micromachining method for the porous surface structure of biomaterials. Background technique [0002] Human hard tissues include bone, cartilage, and teeth. Bone and joints are the main tissues and organs of the human body that bear the load. Therefore, materials used for human hard tissue repair should have high strength. Hard tissue has a complex microstructure in the physiological environment of the human body, and can be roughly divided into compact bone and porous bone according to its porosity. The most obvious difference is their relative density, and the relative density of 5-70% is porous bone. , more than 70% is compact bone. Superficially, bone appears to be a solid solid, but most bone consists of a dense bone shell surrounded by a porous network of bone core. Porous bone The porous structure of mesh bone, consisting ...

Claims

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Application Information

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IPC IPC(8): B23K26/00A61L27/56B23K26/384B23K26/60
Inventor 张松王强胡金玲张春华
Owner SHENYANG POLYTECHNIC UNIV
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