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Laser cladding method of wollastonite-based bioactive ceramic coating on titanium alloy surface

A bioactive ceramic and laser cladding technology, applied in metal material coating process, coating, layered products, etc., can solve the problems of falling blocks, easy peeling, uneven coating structure and crystallinity, etc. High strength, broad application prospects, and the effect of improving mechanical properties

Active Publication Date: 2017-01-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, a variety of bioactive ceramic coatings have been prepared by laser cladding technology, but the preparation of wollastonite-based bioactive ceramic coatings is still mainly by plasma spraying, and the structure and crystallinity of the coating are not uniform, reducing the The biocompatibility and stability of the coating are reduced, and the bonding strength between the coating and the substrate is low, which is prone to peeling and falling off.

Method used

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  • Laser cladding method of wollastonite-based bioactive ceramic coating on titanium alloy surface
  • Laser cladding method of wollastonite-based bioactive ceramic coating on titanium alloy surface
  • Laser cladding method of wollastonite-based bioactive ceramic coating on titanium alloy surface

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Cut the titanium alloy substrate sample into a cuboid with a size of 10mm×10mm×10mm, and use a laser to clad wollastonite on the surface of the titanium alloy.

[0056] The specific process steps are as follows:

[0057] (1) Before laser cladding, clean the surface of titanium alloy, wipe it clean and dry it;

[0058] (2) The wollastonite powder is adjusted into a paste with polyvinyl alcohol aqueous solution, and the addition of polyvinyl alcohol aqueous solution is 15 drops per gram of cladding material powder, and then evenly coated on the surface of the titanium alloy substrate, Coating thickness is 1mm, air dry naturally;

[0059] (3) Laser cladding is performed on the titanium alloy substrate to generate wollastonite-based bioactive ceramic coatings. The process parameters used in the cladding process are: output power 400W, scanning speed 2.5mm / s, spot diameter 3mm , using Ar gas protection, the protection pressure is 0.2MPa.

[0060] In step (2), the preparat...

Embodiment 2

[0062] Cut the titanium alloy sample into a cuboid with a size of 10mm×10mm×10mm, and use a laser to clad wollastonite on the surface of the titanium alloy.

[0063] In the specific process steps, except step (3), the output power is 500W, and the scanning speed is 5mm / s; the remaining process steps are the same as in Example 1.

Embodiment 3

[0065] Cut the titanium alloy sample into a cuboid with a size of 10mm×10mm×10mm, and use a laser to clad wollastonite on the surface of the titanium alloy.

[0066] In the specific process steps, except step (3), the output power is 500W, and the scanning speed is 7.5mm / s; the rest of the process steps are the same as in Example 1.

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Abstract

The invention discloses a method for laser cladding of a wollastonite-based bioactive ceramic coating on the surface of a titanium alloy. The method comprises the following steps: firstly, cleanly wiping the surface of a titanium alloy substrate and blow-drying for later use; secondly, blending wollastonite or wollastonite doped with Na, Mg, Zn or Zr or mixture powder of the wollastonite and rare earth oxides by using a polyvinyl alcohol aqueous solution so as to form a paste; then, manually and evenly coating the paste on the surface of the titanium alloy substrate according to the coating thickness within 0.8mm to 1.0mm and naturally drying; performing the laser cladding on the titanium alloy substrate so as to generate the wollastonite-based bioactive ceramic coating under protection of Ar according to the technological parameters in the cladding process that the output power P is between 0.4kW and 0.7kW, the scanning speed V is between 2.5mm / s and 7.5mm / s and the spot diameter D is between 3mm and 4mm. According to the method, the organization structure, the mechanical property and the biological property of the coating are improved by adding Na2O, MgO, ZnO, ZrO2, CeO2, Y2O3 and other oxides in the coating material, so that the prepared bioactive ceramic coating has the high bonding strength with the substrate and is good in biological activity and stability.

Description

technical field [0001] The invention belongs to the technical field of bioceramic coatings, and more specifically relates to a method for laser cladding wollastonite-based bioactive ceramic coatings on the surface of titanium alloys. Background technique [0002] Biomedical materials refer to new high-tech materials used to combine with living systems to diagnose, treat, repair or replace damaged tissues and organs or enhance their functions. As an important part of biomedical materials research, the research on human implant materials has developed rapidly in recent decades, and has become a hot spot in medical research today. [0003] At present, a variety of implant materials have been applied clinically. Because of its good biocompatibility and bioactivity, hydroxyapatite (HA) widely exists in hard tissues such as animal bones and teeth, and has become the most widely used implant material in clinical practice. However, the strength and toughness of bulk hydroxyapatite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10B32B9/04
Inventor 王佃刚李焕彩陈传忠
Owner SHANDONG UNIV