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Composite technique of preparing lacunaris titanium coating by using cold spraying and vacuum sintering

A vacuum sintering and preparation technology, which is applied in dental preparations, medical science, dentistry, etc., can solve the problems of low bonding strength of porous coating matrix, poor pore uniformity and open pore connectivity, and long process cycle, etc., to achieve long-term improvement Good stability, alleviating implant loosening, and good porosity uniformity

Inactive Publication Date: 2007-09-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing preparation methods of porous titanium coatings are: (1) stacking sintering method, such as stacking titanium balls, titanium short fibers, titanium mesh or TiH 2 Carry out sintering (U.S. Patent US4206516), but the porous coating prepared by this method has low bonding strength with the substrate, problems such as titanium balls or short fibers are easy to fall off; (2) thermal spraying method
In 1971, US patent US3605123 reported plasma spraying TiH 2 Porous titanium coatings were prepared, but the obtained coatings had poor pore uniformity and connectivity
In 1985, the US patent US4542539 prepared a porous titanium gradient coating by flame spraying, but the bonding strength of the coating was low, only 7MPa
The Japanese kobesteel company prepared a porous titanium coating by vacuum plasma spraying, with a porosity of 40-60%, an elastic modulus of 4.7GPa, and a compressive strength of 85MPa; Sulzer Calcitek successfully applied the porous titanium coating prepared by vacuum plasma spraying. It is used in dental implants, and obtained FDA certification in 1997 and entered the market; however, vacuum plasma spraying equipment is expensive, and ordinary companies cannot afford it. In addition, the porous titanium coating prepared by this technology has problems such as pore uniformity and poor connectivity of openings.
Chinese patent 99123708.0 reports a method of spraying "titanium-aluminum" mixed powder by flame or plasma, and then soaking in alkali solution to remove aluminum to prepare porous titanium coating, but the bonding strength of the coating is only 25-45MPa, and there is a process cycle Problems such as difficulty in preparing long and thick coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: 400-mesh spherical magnesium powder and 325-mesh polygonal titanium powder were evenly mixed to make titanium-magnesium mixed powder, wherein the volume content of magnesium powder was 75%. The titanium-magnesium composite coating was prepared by depositing titanium-magnesium mixed powder on the roughened titanium substrate by conventional spraying method. The process parameters of cold spraying are as follows: in N 2 As powder feeding gas and working gas, the pressures of powder feeding gas and working gas are 2.0 and 3.0 MPa respectively, the spraying distance is 20mm, and the spraying temperature is 330°C.

[0012] The prepared titanium-magnesium composite coating was subjected to vacuum distillation and sintering with a vacuum degree of 1×10 ～3 Pa, the sintering temperature is 1200°C, and the time is 2 hours, the magnesium in the composite coating can be removed to obtain a porous titanium coating. Simultaneous distillation and sintering can enhance the...

Embodiment 2

[0014] Example 2: 325-mesh spherical magnesium powder and 325-mesh polygonal titanium powder were evenly mixed to make titanium-magnesium mixed powder, wherein the volume content of magnesium powder was 50%. The titanium-magnesium composite coating was prepared by depositing titanium-magnesium mixed powder on the roughened titanium substrate by conventional cold spraying method. The process parameters of cold spraying are as follows: in N 2 As powder feeding gas and working gas, the pressures of powder feeding gas and working gas are 2.5 and 3.2 MPa respectively, the spraying distance is 20mm, and the spraying temperature is 350°C.

[0015] The prepared titanium-magnesium composite coating was subjected to vacuum distillation and sintering with a vacuum degree of 1×10 ～3 Pa, the sintering temperature is 1200°C, and the time is 2 hours, the magnesium in the composite coating can be removed to obtain a porous titanium coating.

[0016] The porous titanium coating of this embod...

Embodiment 3

[0017] Example 3: 325-mesh spherical magnesium powder and 325-mesh polygonal titanium powder were evenly mixed to make titanium-magnesium mixed powder, wherein the volume content of magnesium powder was 75%. Titanium-magnesium composite coatings were prepared by depositing titanium-magnesium mixed powder on the roughened Ti6A14V substrate by conventional cold spraying method. The process parameters of cold spraying are as follows: in N 2 As powder feeding gas and working gas, the pressures of powder feeding gas and working gas are 2.5MPa and 3.2MPa respectively, the spraying distance is 20mm, and the spraying temperature is 350°C.

[0018] The prepared titanium-magnesium composite coating was subjected to vacuum distillation and sintering with a vacuum degree of 1×10 ～3 Pa, the sintering temperature is 1250°C, and the time is 2 hours, the magnesium in the composite coating can be removed to obtain a porous titanium coating.

[0019] The porous titanium coating prepared in th...

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Abstract

The present invention discloses composite cold spraying and vacuum sintering process for preparing porous titanium coating. Mixed titanium-magnesium powder is first sprayed onto the roughened titanium or titanium alloy substrate to form composite titanium-magnesium coating, which is then sintered at high vacuum and high temperature to obtain porous titanium coating. Thus produced porous titanium coating has no oxide, thickness greater than 0.5 mm, opened and communicated pore structure, pores of 30-200 microns, porosity of 30-65 %, and metallurgical combination with the substrate with combination strength higher than 60MPa and elastic modulus adjustable in 30-50 GPa. The present invention is suitable for making bearing hard tissue implant, such as artificial joint, artificial bone, artificial tooth root, etc. with improved long term stability.

Description

technical field [0001] The invention relates to a preparation process of a titanium-based medical implant surface (such as a titanium and titanium alloy dental implant and a bone implant), in particular to a composite process for preparing a porous titanium coating by cold spraying and vacuum sintering. Background technique [0002] Titanium and its alloys are widely used in the repair and replacement of implants for damaged hard tissues due to their excellent biocompatibility, corrosion resistance and high specific strength. However, the poor long-term stability of the interface between the titanium-based implant and the host bone and the loosening of the implant caused by the mismatch of the elastic modulus are two major problems in clinical application. The method to solve the above problems is to compound porous titanium thick coating on titanium-based implants. The elastic modulus of the porous titanium coating can be matched with the host bone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/42A61L31/12A61K6/04
Inventor 孙继锋憨勇崔凯
Owner XI AN JIAOTONG UNIV
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