CN219578955U

CN219578955U - Orthopedics sword with compound stereoplasm coating

Info

Publication number: CN219578955U
Application number: CN202320640129.3U
Authority: CN
Inventors: 陈君; 吴国平
Original assignee: Suzhou Champion Coating Technology Co ltd
Current assignee: Suzhou Champion Coating Technology Co ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-08-25
Anticipated expiration: 2033-03-28

Abstract

The utility model discloses an orthopaedics knife with a composite hard coating, which comprises a substrate and the composite hard coating formed on the surface of the substrate, wherein the substrate is a medical orthopaedics knife, the composite hard coating comprises an adhesion layer formed on the surface of the substrate, a transition layer formed on the adhesion layer and a surface layer formed on the transition layer, the adhesion layer is a Ti layer, the transition layer is a TiCuNiZrN layer, the surface layer is an AlCrSiWN layer, and the adhesion layer, the transition layer and the surface layer are all deposited by a vacuum arc ion plating technology, so that the common medical stainless steel orthopaedics knife has the antibacterial performance while improving the hardness, the wear resistance and the corrosion resistance, thereby improving the service life and the use safety of the common stainless steel orthopaedics knife and improving the comprehensive performance of the common stainless steel orthopaedics knife.

Description

Orthopedics sword with compound stereoplasm coating

Technical Field

The utility model relates to the technical field of medical instrument surface treatment, in particular to an orthopedic knife with a composite hard coating.

Background

With the continuous progress of the medical industry, the traditional orthopedic knife cannot meet the increasingly stringent performance requirements. The orthopaedics knife is a commonly used orthopaedics medical appliance, which is easy to cause friction loss after being repeatedly in direct contact with human bones and cleaned and disinfected, and is easy to cause corrosion and bacterial residues when in use, thereby greatly reducing the service life and the use safety of the orthopaedics knife. The functional coating with high hardness, high wear resistance, corrosion resistance and good antibacterial property is deposited on the common medical stainless steel orthopedic knife, and is an effective way for improving the service life and the use safety of medical instruments. Vacuum arc ion plating deposition is often used to deposit multiple layers of different types of coating materials because of its advantages of fast rate, uniform film thickness, good adhesion, and low cost.

Compared with the traditional cobalt-based and nickel-based superalloy, the titanium-based alloy has low density, high adhesion strength, high strength and high elastic modulus at high temperature, is an ideal high-temperature structural material, but the titanium-based alloy has poor oxidation resistance. The application of protective coatings to the Ti-based alloy surface is one of the common methods for improving the resistance of titanium alloys to high temperature oxidation.

It is well known that TiN coatings have a similar coefficient of expansion as Ti coatings, so that both can bond well. TiN coatings are often used as strengthening coatings for tool surfaces because of their improved wear resistance, reduced coefficient of friction, and prevention of sticking, but depositing a single TiN coating on an orthopaedic tool surface has the following disadvantages: (1) the corrosion resistance of TiN coating needs to be further improved; (2) The hardness of the bone of the human body is high and the density is high, and the hardness of the TiN coating layer can not meet the requirements of the actual orthopaedics knife at times; (3) The common medical stainless steel orthopedic knife is often exposed to air, and the surface is easy to be infected with bacteria or nourish bacteria. In order to solve the problems, the TiN coating is introduced with alloying elements such as Ni, zr, cu, W and the like, so that the hardness of the coating can be further improved, and the solubility and the diffusion coefficient of oxygen in the corrosion oxidation process are reduced to improve the corrosion resistance. The Cu element can be slowly separated out for a long time to form Cu ions, the Cu ions have strong bactericidal effect, and the coating has antibacterial performance through the continuous separation of the Cu ions.

Currently, alCrN coatings have been developed as an excellent commercial coating, and ternary AlCrN coatings have higher hardness than TiN coatings and excellent oxidation resistance and are widely used as cutting tool coatings, mold protective coatings and the like. Recent researches find that the hardness of the AlCrN coating can be further improved by introducing Si and W elements into the AlCrN coating.

Based on the method, the composite hard coating with high hardness, high wear resistance and corrosion resistance and antibacterial property is prepared on the surface of the common medical stainless steel orthopedic knife, and the service life and the use safety of the common medical stainless steel orthopedic knife are improved by the composite hard coating.

Disclosure of Invention

The utility model aims to improve the service life and the use safety of the common medical stainless steel orthopedic knife.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides an orthopaedics knife with a composite hard coating, which comprises a substrate and a composite hard coating formed on the surface of the substrate, wherein the substrate is a medical orthopaedics knife, the composite hard coating comprises an adhesion layer formed on the surface of the substrate, a transition layer formed on the adhesion layer and a surface layer formed on the transition layer, the adhesion layer is a Ti layer, the transition layer is a TiCuNiZrN layer, and the surface layer is an AlCrSiWN layer.

Further, the substrate is a medical stainless steel orthopedic knife.

Further, the thickness of the adhesion layer is 0.5 to 1.2 μm.

Further, the thickness of the transition layer is 1 to 1.6 μm.

Further, the thickness of the surface layer is 1.2 to 2.2 μm.

Further, a Ti layer is deposited on the substrate surface by vacuum arc ion plating techniques.

Further, a TiCuNiZrN layer is deposited on the Ti layer by vacuum arc ion plating technique.

Further, an AlCrSiWN layer is deposited on the TiCuNiZrN layer by vacuum arc ion plating technique.

Due to the technical scheme, the utility model has the following functional effects:

the orthopedic knife with the composite hard coating provided by the utility model has the capability of high hardness of 36.0+/-3 GPa and slowly precipitating Cu ions, so that the wear resistance and corrosion resistance of the medical orthopedic knife made of stainless steel can be greatly improved, and the orthopedic knife has long-term antibacterial performance.

The foregoing description is only an overview of the present utility model, and is intended to provide a better understanding of the present utility model, as it is embodied in the following description, with reference to the preferred embodiments of the present utility model and the accompanying drawings.

Drawings

FIG. 1 is a schematic structural view of one embodiment of an orthopedic knife with a composite hard coating of the present utility model, with the front grid shading locations of the orthopedic knife being the coating areas;

fig. 2 is a schematic structural view of the composite hard coating of the orthopedic knife having the composite hard coating of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

The orthopedic knife with a composite hard coating of the embodiment comprises a substrate 2 and a composite hard coating 1 formed on the surface of the substrate 2, wherein the substrate 2 is a common medical stainless steel orthopedic knife, the composite hard coating 1 comprises an adhesion layer 11 formed on the surface of the substrate 2, a transition layer 12 formed on the adhesion layer 11 and a surface layer 13 formed on the transition layer 12, the adhesion layer 11 is a Ti layer with the thickness of 0.5-1.2 mu m, the transition layer 12 is a TiCuNiZrN layer with the thickness of 1-1.6 mu m, the surface layer 13 is an AlCrSiWN layer with the thickness of 1.2-2.2 mu m, the content of Si element is 3-6 at, the content of W element is 2-5 at, and the total thickness of the composite hard coating 1 is 2.7-5 mu m. The Ti layer is deposited on the surface of the substrate 2 by a vacuum arc ion plating technique, the TiCuNiZrN layer is deposited on the Ti layer by a vacuum arc ion plating technique, and the AlCrSiWN layer is deposited on the TiCuNiZrN layer by a vacuum arc ion plating technique. The Ti layer and the TiCuNiZrN form a composite structure with high binding force, the composite structure has antibacterial property, abrasion resistance and corrosion resistance, and the AlCrSiWN layer has the functions of improving the abrasion resistance of the composite hard coating 1, releasing the working stress of the TiCuNiZrN layer and preventing the TiCuNiZrN layer from cracking, so that the coating has ideal hardness, corrosion resistance and antibacterial property, and the orthopaedics knife has ideal service life and use safety.

The following is a description of a method for preparing the above-mentioned orthopedic knife having the composite hard coating layer 1, and the preparation method should not be construed as limiting the present embodiment.

Step one, depositing a Ti coating on the surface of a medical stainless steel orthopedic knife by using a vacuum arc ion plating technology: before deposition, the surface of the substrate is sequentially subjected to grinding, polishing, cleaning and drying. In the coating deposition furnace, the surface of the substrate sample is subjected to Cr ion etching to remove adsorption pollution. A pair of Ti with 99.9% purity is used as a target source, the working power of the Ti target source is 3kW, the arc current is 70A, argon (Ar) is used as a working atmosphere, the pressure is 3.8Pa, the substrate bias is-60V, and the deposition time is 10min.

And secondly, preparing a TiCuNiZrN coating on the surface of the Ti layer by using a vacuum arc ion plating technology. A pair of Al70Cr30 and Ti60Cu25Ni7.5Zr7.5 are used as target sources, the working power of the Al70Cr30 target power supply is 0.5kW, the arc current is 5A, the working power of the Ti60Cu25Ni7.5Zr7.5 target power supply is 3kW, the arc current is 15A, nitrogen (N2) is a working atmosphere, the pressure is 3.8Pa, the substrate bias is-50V, and the deposition time is 25min.

And thirdly, preparing an AlCrSiWN coating on the surface of the TiCuNiZrN layer by using a vacuum arc ion plating technology. A pair of Al70Cr30 and AlCrSiW are used as target sources, the working power of an Al70Cr30 target power supply is 0.5kW, the arc current is 5A, the working power of AlCrSiW is 0.5kW, the arc current is 5A, nitrogen (N2) is a working atmosphere, the pressure is 3.8Pa, the substrate bias voltage is-50V, and the deposition time is 35min.

The overall thickness of the prepared composite structure coating is 2.7-5 mu m, and the coating structure is compact. The mechanical property test result is as follows: the hardness is 36.0+ -3 GPa. The corrosion resistance test result is as follows: the knife edge area for medical orthopaedics is soaked in 3.6wt.% NaCl water solution for 720 hours without obvious rust spots and etching holes. The medical orthopaedics knife blade has good wear resistance and corrosion resistance, and has long-term antibacterial performance due to the sustainable precipitation of Cu ions.

The adhesion layer Ti layer 11, the transition layer TiCuNiZrN layer 12 and the surface layer AlCrSiWN layer 13 do not react with each other during step deposition, and the continuous precipitation of Cu ions is not equivalent to the reaction between the transition layer 12 and the surface layer 13, on one hand, extremely slow atomic diffusion and migration processes exist in all existing composite coatings, the coating in the embodiment is no exception, and trace Cu atoms can be diffused and migrated to the surface of the whole coating and contact with the external environment to be oxidized into Cu ions; on the other hand, the coating itself inevitably has a small number of micro cracks or pores (i.e. micro channels), and external environmental media such as water, oxygen and the like can contact with the TiCuNiZrN layer of the transition layer 12 through the micro channels to cause oxidation of Cu atoms, cu ions generated by oxidation can diffuse to the surface of the coating through the micro channels to release, and the atomic diffusion migration and the external media contact oxidation with the middle layer of the composite coating through the micro channels are a very long and slow process, which is accompanied by the whole service period of the coating.

The raw materials for preparing the composite coating can be purchased or customized from commercial sources, and related raw material targets can be prepared by a powder metallurgy method.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

Claims

1. The orthopedic knife with the composite hard coating is characterized by comprising a substrate and the composite hard coating formed on the surface of the substrate, wherein the substrate is a medical orthopedic knife, the composite hard coating comprises an adhesion layer formed on the surface of the substrate, a transition layer formed on the adhesion layer and a surface layer formed on the transition layer, the adhesion layer is a Ti layer, the transition layer is a TiCuNiZrN layer, and the surface layer is an AlCrSiWN layer.

2. The orthopedic knife with composite hard coating according to claim 1, wherein the substrate is a medical stainless steel orthopedic knife.

3. The orthopedic knife with composite hard coating according to claim 1, wherein the thickness of the adhesion layer is 0.5-1.2 μm.

4. The orthopedic knife with composite hard coating according to claim 1, wherein the thickness of the transition layer is 1-1.6 μm.

5. The orthopedic knife with composite hard coating according to claim 1, wherein the thickness of the surface layer is 1.2-2.2 μm.

6. The orthopedic knife with composite hard coating of claim 1 wherein the Ti layer is deposited on the substrate surface by vacuum arc ion plating techniques.

7. The orthopaedic blade having a composite hard coating according to claim 1, wherein the TiCuNiZrN layer is deposited on the Ti layer by vacuum arc ion plating technique.

8. The orthopaedic blade having a composite hard coating according to claim 1, wherein the AlCrSiWN layer is deposited on the TiCuNiZrN layer by vacuum arc ion plating.