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

Abstract

The invention discloses a composite process for preparing porous titanium coating by using cold spraying and vacuum sintering. The titanium or titanium alloy roughened by sandblasting is used as the base material, and the titanium-magnesium mixed powder is sprayed on the base material by the cold spraying method. , the titanium-magnesium composite coating was prepared, and then the porous titanium coating was obtained by distillation and sintering under high vacuum and high temperature. The prepared porous titanium coating: the coating has no oxidation, the thickness is greater than 0.5mm, and it has an open-pore connected structure. , the coating and the substrate are metallurgically bonded, the bonding strength is higher than 60MPa, and the elastic modulus is adjustable between 30 and 50GPa according to the pore structure of the coating. It can be used to manufacture load-bearing hard tissue implants with porous titanium surface, such as artificial joints, artificial bones, tooth roots, etc. The porous titanium coating structure is suitable for bone tissue ingrowth and can improve the long-term stability of the implant-host bone interface , while alleviating the implant loosening caused by the mismatch of elastic modulus.

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 by adjusting the porosit...

Examples

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 Ti6Al4V 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...

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 by adjusting the porosit...

Examples

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 Ti6Al4V 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...