Method for constructing a bioglass coating on a magnesium alloy surface

Abstract

The application relates to the technical field of glass coating and discloses a method for constructing a biological glass coating on the surface of a magnesium alloy, which comprises the following steps: step 1, irradiating a biological glass sheet with laser emitted by a laser emitter to form glass melting drops; and step 2, spraying the glass melting drops to the surface of the magnesium alloy by airflow generated by an airflow spraying device to construct the biological glass coating on the surface of the magnesium alloy. According to the application, the glass melting drops are cooled and sprayed by high-speed airflow, so that the temperature of the glass melting drops when contacting the magnesium alloy is lower than the melting point of the magnesium alloy; at this time, the glass melting drops have good adhesion, the glass melting drops are adhered to the surface of the magnesium alloy, the biological glass coating is formed, and the biological glass coating is constructed on the surface of the low-melting-point magnesium alloy by the high-melting-point biological glass.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass coating, and particularly relates to a method for constructing a bio-glass coating on a magnesium alloy surface. BACKGROUND

[0002] As a new generation of degradable bone repair material, magnesium alloy has good mechanical properties, biocompatibility and degradable characteristics, which has attracted extensive attention and research. However, magnesium alloy material is quickly corroded in a physiological environment, thereby causing accumulation of subcutaneous hydrogen (H2), resulting in formation of a subcutaneous gas cavity and separation of the implant material and the tissue interface, which can directly lead to failure of the entire implantation operation; meanwhile, when the pH value of the tissue microenvironment exceeds 7.8, the release of hydrogen gas causes an alkalization reaction in the micro area, thereby causing alkalosis of the tissue; in addition, the precipitation of hydrogen gas and alkalization also rapidly reduce the mechanical strength of the implanted material and lead to premature failure of the implanted material. Therefore, the corrosion resistance of magnesium alloy directly determines the application effect of the magnesium alloy implant material.

[0003] In recent years, the corrosion behavior of magnesium alloy can be effectively inhibited by preparing a protective coating on the surface of the magnesium alloy. Among them, bio-glass, as a biomedical inorganic material, has good chemical stability, controllable degradation, biocompatibility and bone conductivity, but its high brittleness, poor processability and low toughness make it unable to be used as a load-bearing bone replacement material. If it is used to construct a coating on the surface of the magnesium alloy, a win-win of mechanical compatibility and biocompatibility can be achieved. However, since the melting temperature of the magnesium alloy (600-650℃) is much lower than the melting temperature of the bio-glass (800-1000℃), it is difficult to directly construct a coating on the surface of the magnesium alloy by a physical method of high-temperature glass cladding.

[0004] At present, the main method for synthesizing a glass coating on the surface of the magnesium alloy is based on the sol-gel principle. Patent applications CN102886073A and CN103495202A use a medical magnesium alloy as a substrate, configure a sol system solution based on a glass formula P2O5-SiO2-CaO-Na2O system, repeatedly dip and draw the magnesium alloy in the matching solution, cause a gel reaction, and then place it in a high temperature of 400-500℃ for heat treatment for 2-4 hours, so as to finally synthesize a glass coating on the surface of the magnesium alloy. This method can control the coating forming temperature to be lower than the melting temperature of the magnesium alloy, so as to ensure the structure of the magnesium alloy, but the processes of dip and draw and heat treatment cause a long coating construction time, and the size of the coating is difficult to accurately control, and the morphology is single.

[0005] On this basis, patent application CN115305544A proposes an electrophoretic deposition method, which forms a suspension by mixing a sol-gel method formed bio-glass powder with alcohol and water, uses magnesium alloy as the cathode and stainless steel sheet as the anode, and uses the principle of electrolytic cell to cause electrophoretic deposition of glass powder particles on the surface of magnesium alloy to obtain a glass coating. This method requires the use of sol-gel method to form bio-glass to achieve nano-sized glass powder, and the coating needs to be dried for 24 hours.

[0006] In addition, patent application CN104474587A proposes to combine a pressurization strategy with a sol-gel method to construct a glass coating on the surface of magnesium alloy. The combination of pressurization and heat treatment can effectively improve the interface performance between magnesium alloy and bio-glass coating, but faces the same problems as the sol-gel method, such as long forming cycle and difficulty in structure regulation.

[0007] Existing literature discloses technical ideas for constructing bio-glass coating on the surface of magnesium alloy, but there are problems such as inability to directly construct a cladding coating on the surface of magnesium alloy, low coating construction efficiency, and inability to customize design and regulation for the cladding area of the coating on the surface of magnesium alloy. SUMMARY

[0008] The purpose of the present application is to overcome the problem that the existing technology cannot directly construct a coating on the surface of magnesium alloy by physical methods such as high-temperature glass cladding, and to provide a method for constructing a bio-glass coating on the surface of magnesium alloy. The method forms glass droplets by rapidly melting bio-glass sheet with a laser, then blows the glass droplets to the surface of magnesium alloy under the action of high-speed airflow, and the glass droplets adhere to the surface of magnesium alloy to construct a bio-glass coating. The bio-glass coating can improve the bioactivity of magnesium alloy and regulate the electrochemical degradation rate of magnesium alloy, providing long-term stable structural mechanical support for magnesium alloy.

[0009] To achieve the above purpose, the present application provides a method for constructing a bio-glass coating on the surface of magnesium alloy, which comprises the following steps:

[0010] Step 1: irradiate the bio-glass sheet with laser emitted by a laser emitter to form glass droplets;

[0011] Step 2: use the airflow generated by the airflow blowing device to blow the glass droplets to the surface of magnesium alloy to construct a bio-glass coating on the surface of magnesium alloy.

[0012] Preferably, the thickness of the bio-glass sheet is 0.5-2mm.

[0013] Preferably, the wavelength of the laser is 8-12μm, the spot is 1-10cm 2 , and the power is 5-20kW / cm 2 .

[0014] Preferably, the temperature of the glass melt drop is 1000-1400℃.

[0015] Preferably, the viscosity of the glass melt drop is lg1.2-lg1.5 Pa·s.

[0016] Preferably, the included angle between the airflow and the laser is 10-45°.

[0017] Preferably, the temperature of the airflow is 300-500℃.

[0018] Preferably, the flow rate of the airflow is 10-50m / s.

[0019] Preferably, the airflow is a dry compressed air stream, a nitrogen gas stream, an argon gas stream or a helium gas stream.

[0020] Preferably, the covering shape of the bio-glass coating on the surface of the magnesium alloy is a round drop shape, an oval shape, a fiber shape or a surface shape.

[0021] Preferably, the bio-glass sheet is a silicate bio-glass sheet or a non-silicon bio-glass sheet.

[0022] Preferably, the raw materials for preparing the silicate bio-glass sheet include SiO2, B2O3, P2O5, CaO, MgO and Na2O, and the molar ratio of the SiO2, B2O3, P2O5, CaO, MgO and Na2O is 1:0.018-0.25:0.09-0.38:0.09-0.63:0.055-0.38:0.009-0.25.

[0023] Preferably, the raw materials for preparing the non-silicon bio-glass sheet include P2O5, B2O3, Fe2O3, CaO, MgO and Na2O, and the molar ratio of the P2O5, B2O3, Fe2O3, CaO, MgO and Na2O is 1:0.05-0.33:0.05-0.33:0.17-0.56:0.083-0.44:0.008-0.11.

[0024] Compared with the prior art, the above technical solutions of the present application have the following advantages:

[0025] 1. Based on the characteristics of high efficiency of laser heat melting, the bio-glass sheet is rapidly melted to form a glass melt drop without contacting the magnesium alloy.

[0026] 2、The application is based on high-speed airflow to cool and spray the glass melt drops, so that the temperature of the glass melt drops when contacting the magnesium alloy is lower than the melting point of the magnesium alloy, but at the same time, the glass melt drops have good adhesion, so that the glass melt drops adhere to the surface of the magnesium alloy to form a bio-glass coating, and the high-melting-point bio-glass is constructed on the surface of the low-melting-point magnesium alloy to form a bio-glass coating.

[0027] 3、The application can construct different forms of bio-glass coatings by adjusting the key parameters such as laser power, airflow spraying rate and airflow temperature, and has the ability to customize multi-form bio-glass coatings on the surface of magnesium alloy. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the bio-glass sheet constructing a bio-glass coating on the surface of the magnesium alloy;

[0029] Figure 2 is a schematic diagram of the round-drop-shaped bio-glass coating;

[0030] Figure 3 is a schematic diagram of the oval-shaped bio-glass coating;

[0031] Figure 4 is a schematic diagram of the fiber-shaped bio-glass coating;

[0032] Figure 5 is a schematic diagram of the planar bio-glass coating.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 1, laser emitter; 2, laser; 3, airflow spraying device; 4, airflow; 5, bio-glass sheet; 6, bio-glass coating; 7, magnesium alloy. DETAILED DESCRIPTION

[0035] The specific embodiments of the application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the application, and are not used to limit the application.

[0036] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The ranges or values should be construed to be approximations that allow for significant variation. Various ranges of values that are provided are only meant to serve as examples. Other ranges of values can be easily determined without departing from the scope of the application.

[0037] The application provides a method for constructing a bio-glass coating on the surface of a magnesium alloy, which comprises the following steps:

[0038] Step 1: irradiating the bio-glass sheet 5 with laser light 2 emitted by the laser emitter 1 to form glass melt droplets;

[0039] Step 2: spraying the glass melt droplets to the surface of the magnesium alloy 7 with airflow 4 generated by the airflow spraying device 3 to build the bio-glass coating 6 on the surface of the magnesium alloy 7.

[0040] In the present application, the bio-glass sheet 5 is a silicate bio-glass sheet or a non-silicate bio-glass sheet.

[0041] In the present application, the raw materials for preparing the silicate bio-glass sheet include SiO2, B2O3, P2O5, CaO, MgO and Na2O, and the molar ratio of the SiO2, B2O3, P2O5, CaO, MgO and Na2O is 1:0.018-0.25:0.09-0.38:0.09-0.63:0.055-0.38:0.009-0.25.

[0042] In a preferred case, the molar ratio of the SiO2, B2O3, P2O5, CaO, MgO and Na2O is 1:0.05-0.2:0.1-0.3:0.1-0.5:0.1-0.3:0.01-0.25; in a further preferred case, the molar ratio of the SiO2, B2O3, P2O5, CaO, MgO and Na2O is 1:0.1-0.2:0.2-0.3:0.2-0.5:0.2-0.3:0.1-0.25. Specifically, the molar ratio of the SiO2, B2O3, P2O5, CaO, MgO and Na2O can be 1:0.11:0.22:0.44:0.22:0.22, 1:0.1:0.1:0.3:0.3:0.2 or 1:0.15:0.25:0.4:0.25:0.15.

[0043] In the present application, the raw materials for preparing the non-silicate bio-glass sheet include P2O5, B2O3, Fe2O3, CaO, MgO and Na2O, and the molar ratio of the P2O5, B2O3, Fe2O3, CaO, MgO and Na2O is 1:0.05-0.33:0.05-0.33:0.17-0.56:0.083-0.44:0.008-0.11.

[0044] In a preferred case, the molar ratio of P2O5, B2O3, Fe2O3, CaO, MgO and Na2O is 1: 0.1-0.3: 0.1-0.3: 0.2-0.5: 0.1-0.4: 0.01-0.11; in a further preferred case, the molar ratio of P2O5, B2O3, Fe2O3, CaO, MgO and Na2O is 1: 0.12-0.28: 0.1-0.2: 0.3-0.5: 0.15-0.35: 0.05-0.11. Specifically, the molar ratio of P2O5, B2O3, Fe2O3, CaO, MgO and Na2O can be 1:0.22:0.11:0.44:0.33:0.11, 1:0.18:0.15:0.4:0.2:0.08 or 1:0.2:0.2:0.35:0.25:0.1.

[0045] In the present invention, the preparation method of the silicate bioglass sheet is: mixing the raw material powders of the silicate bioglass sheet in proportion, melting them into liquid at a temperature of 1200-1400°C, keeping the temperature for 1-5 hours, then pouring the liquid into a forming mold, and pressing and molding them in an integrated manner to obtain the silicate bioglass sheet.

[0046] In the present invention, the preparation method of the silicon-free bioglass sheet is: mixing the raw material powder of the silicon-free bioglass sheet in proportion, melting it into liquid at a temperature of 1000-1200°C, keeping it warm for 1-5 hours, then pouring the liquid into a forming mold, and pressing it into an integrated form to obtain the silicon-free bioglass sheet.

[0047] In the present invention, the size of the bioglass sheet 5 can be controlled by a molding mold, and can also be cut according to the size (length and width) required by laser processing after molding.

[0048] In the present invention, the length and width of the bioglass sheet 5 are selected according to the actual movement range of the laser emitter 1.

[0049] In the present invention, the thickness of the bioglass sheet 5 is 0.5-2 mm. Specifically, the thickness of the bioglass sheet 5 can be 0.5 mm, 1 mm, 1.5 mm or 2 mm.

[0050] In the present invention, the wavelength of the laser 2 is 8-12 μm and the spot size is 1-10 cm. 2 , power is 5-20kW / cm 2 Specifically, the wavelength of the laser 2 can be 8 μm, 9 μm, 10 μm, 11 μm or 12 μm; the spot size of the laser 2 can be 1 cm 2 , 2cm 2 , 3cm 2 , 4cm2 5cm 2 6cm 2 7cm 2 8cm 2 9cm 2 or 10cm 2 ; the power of the laser 2 can be 5kW / cm 2 10kW / cm 2 15kW / cm 2 or 20kW / cm 2 .

[0051] In the present application, the laser emitter 1 is arranged above the bio-glass sheet 5, and the laser emitter 1 is freely movable in the horizontal X, Y axis direction.

[0052] In the present application, the vertical distance between the laser emitting port of the laser emitter 1 and the bio-glass sheet 5 is 100-250mm. Specifically, the vertical distance between the laser emitting port of the laser emitter 1 and the bio-glass sheet 5 can be 100mm, 150mm, 200mm or 250mm.

[0053] In the present application, the laser 2 is parallel to the Z axis direction.

[0054] In the present application, an arbitrary point X1Y1 on the bio-glass sheet 5 is designated as the starting point, the laser 2 irradiates the starting point X1Y1 of the glass sheet 5, and sequentially moves in the X axis direction and the Y axis direction, forming a reciprocating motion track.

[0055] In the present application, the movement speed of the laser 2 in the X axis direction and the Y axis direction is 0.05-0.5m / min. Specifically, the movement speed of the laser 2 in the X axis direction and the Y axis direction can be 0.05m / min, 0.1m / min, 0.2m / min, 0.3m / min, 0.4m / min or 0.5m / min.

[0056] In the present application, the bio-glass sheet 5 is arranged above the magnesium alloy, and the vertical distance between the bio-glass sheet 5 and the magnesium alloy is 50-100mm. Specifically, the vertical distance between the bio-glass sheet 5 and the magnesium alloy can be 50mm, 60mm, 70mm, 80mm, 90mm or 100mm.

[0057] In the present application, the temperature of the glass melt droplet is 1000-1400℃. Specifically, the temperature of the glass melt droplet can be 1000℃, 1100℃, 1200℃, 1300℃ or 1400℃.

[0058] In the present application, the viscosity of the glass melt droplet is lg1.2-lg1.5 Pa·s. Specifically, the viscosity of the glass melt droplet can be lg1.2 Pa·s, lg1.3 Pa·s, lg1.4 Pa·s or lg1.5 Pa·s.

[0059] In the present application, the airflow blowing device 3 is arranged between the bio-glass sheet 5 and the laser emitter 1. The airflow 4 is blown out from the airflow blowing device 3, and the airflow 4 is at an angle with the laser 2.

[0060] In the present application, the angle between the airflow 4 and the laser 2 is 10-45°. Specifically, the angle between the airflow 4 and the laser 2 can be 10°, 15°, 20°, 25°, 30°, 40° or 45°.

[0061] In the present application, the temperature of the airflow 4 is 300-500℃. In a preferred case, the flow rate of the airflow 4 is 10-50 m / s. Specifically, the temperature of the airflow 4 can be 300℃, 350℃, 400℃, 450℃ or 500℃; the flow rate of the airflow 4 can be 10 m / s, 20 m / s, 30 m / s, 40 m / s or 50 m / s.

[0062] In the present application, the temperature of the airflow 4 is lower than the temperature of the glass melt droplet, the airflow 4 blown out from the airflow blowing device 3 is used to cool the glass melt droplet, the temperature of the glass melt droplet is lowered from 1000-1400℃ to 500-600℃, which is lower than the melting temperature of the magnesium alloy; at the same time, the viscosity of the glass melt droplet is also increased from lg1.2-lg1.5 Pa·s to lg5-lg7 Pa·s.

[0063] In the present application, the airflow 4 is a dry compressed air flow, a nitrogen gas flow, an argon gas flow or a helium gas flow.

[0064] In the present application, the nozzle of the airflow blowing device 3 is selected according to the size of the fiber melting area and the spot size.

[0065] In the present application, the nozzle can be a round nozzle or a flat nozzle. The diameter of the round nozzle is 3-30 mm; the distance between the two ends of the flat nozzle is 10-100 mm, the two ends of the flat nozzle are semicircular structures, and the diameter of the semicircle is 3-30 mm.

[0066] In the present application, the diameter of the round opening can be 3mm, 5mm, 10mm, 15mm, 20mm, 25mm or 30mm; the distance between the two ends of the flat opening can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm or 100mm; the diameter of the semicircle can be 3mm, 5mm, 10mm, 15mm, 20mm, 25mm or 30mm.

[0067] In the present application, the airflow 4 targets the surface of the magnesium alloy 7, blows the glass melt droplet in the target direction, cools the glass melt droplet in the process of blowing, and makes the cooled glass melt droplet adhere to the surface of the magnesium alloy 7; after the glass melt droplet contacts the surface of the magnesium alloy 7, it is extruded and drawn under the impact of the airflow 4, forming the bio-glass coating 6 and covering the surface of the magnesium alloy 7.

[0068] In the present application, the bio-glass coating 6 covers the surface of the magnesium alloy 7 in the shape of a round droplet, an oval, a fiber or a plane.

[0069] In the present application, by controlling the power of the laser 2, the temperature and speed of the airflow 4, a single or multiple forms of bio-glass coating can be coated on the surface of the magnesium alloy.

[0070] In the present application, the magnesium alloy is a magnesium alloy formed by combining magnesium with one or more of aluminum, zinc, manganese, calcium, cesium or zirconium.

[0071] In the present application, the magnesium alloy is in the form of a flat plate or an irregular curved surface.

[0072] The present application will be described in detail below through examples. The magnesium-zinc alloy flat plate with or without a bio-glass coating and the magnesium-calcium alloy flat plate were tested for biological activity and degradation behavior, and the results are shown in Table 1. The biological activity test was based on the GB16886.5 standard, and the CCK8 detection method was used for analysis, while the degradation behavior test was characterized by the in vitro simulated body fluid immersion method according to the ISO10993.15 standard.

[0073] Example 1

[0074] A silicate bioglass sheet is prepared using raw materials including SiO2, B2O3, P2O5, CaO, MgO and Na2O, the molar ratio of the SiO2, B2O3, P2O5, CaO, MgO and Na2O being 1:0.11:0.22:0.44:0.22:0.22; the raw materials are mixed uniformly and then melted into a liquid at a temperature of 1200°C, and then the liquid is kept for 2 hours for temperature homogenization, and then the liquid is poured into a forming mold for integrated compression molding to obtain a silicate bioglass sheet with a size of 200mm x 200mm and a thickness of 1mm;

[0075] A magnesium-zinc alloy flat plate is used as a substrate, and the silicate bioglass sheet is placed above the magnesium-zinc alloy flat plate, with a distance of 80mm between the silicate bioglass sheet and the magnesium-zinc alloy flat plate;

[0076] Then, a laser 2 with a wavelength of 10.6μm is emitted from a laser emitter 1, the spot size of the laser 2 being 2cm 2 , the power being 15kW / cm 2 , and a vertical distance of 150mm is kept between the emission port of the laser emitter 1 and the silicate bioglass sheet, the spot of the laser 2 irradiates the surface of the silicate bioglass sheet, and the spot of the laser 2 reciprocates in the horizontal direction (XY axis direction) at a rate of 0.02m / min, the silicate bioglass sheet in the spot area is rapidly heated to 1250°C and starts to melt, and after complete melting, a glass melt drop is formed, the viscosity of the glass melt drop being lg1.2 Pa·s;

[0077] Compressed air with a temperature of 500°C is sprayed from an air flow spraying device 3, the angle between the compressed air and the laser 2 being 15°, the nozzle of the air flow spraying device 3 adopts a circular port with a diameter of 10mm, the air flow spraying device 3 sprays air flow to the glass melt drop, the flow rate of the air flow being 40m / s, the glass melt drop is cooled to 500°C under the action of the air flow, at this time the viscosity of the glass melt drop is increased to lg5 Pa·s; at the same time, the air flow sprays the cooled glass melt drop to the surface of the magnesium-zinc alloy flat plate in time and adheres to the surface of the magnesium-zinc alloy flat plate, and finally a circular drop-shaped silicate bioglass coating is formed on the surface of the magnesium-zinc alloy flat plate as shown in Figure 2 ;

[0078] The magnesium-zinc alloy flat plate with the silicate bioglass coating is subjected to bioactivity test and degradation behavior test, in 14-day osteoblast culture, the cell activity optical value (OD / 450nm) of the osteoblasts at the 7th day and the 14th day is 0.5 and 0.9 respectively, and the degradation rate of the magnesium-zinc alloy flat plate in 28-day simulated body fluid is about 0.12mm / day.

[0079] Example 2

[0080] The raw materials for preparing the silicon-free bio-glass sheet include P2O5, B2O3, Fe2O3, CaO, MgO and Na2O, and the molar ratio of the P2O5, B2O3, Fe2O3, CaO, MgO and Na2O is 1:0.22:0.11:0.44:0.33:0.11; after the above raw materials are uniformly mixed, the mixture is melted into a liquid at a temperature of 1000°C, and is kept for 2 hours for homogenization, and then the liquid is poured into a forming mold for integrated press forming to obtain a silicon-free bio-glass sheet with a size of 200mm*200mm and a thickness of 1mm;

[0081] The silicon-free bio-glass sheet is placed above the magnesium-zinc alloy flat plate, and the distance between the silicon-free bio-glass sheet and the magnesium-zinc alloy flat plate is 80mm;

[0082] Then, a laser 2 with a wavelength of 10.6μm is emitted from a laser emitter 1, the spot size of the laser 2 is 2.5cm 2 , the power is 10kW / cm 2 , the vertical distance between the emission port of the laser emitter 1 and the silicon-free bio-glass sheet is 150mm, the spot of the laser 2 irradiates the surface of the silicon-free bio-glass sheet, and the spot of the laser 2 reciprocates in the horizontal direction (XY axis direction) at a rate of 0.2m / min, the silicon-free bio-glass sheet in the spot area is rapidly heated to 1100°C and starts to melt, and after complete melting, a glass melt drop is formed, and the viscosity of the glass melt drop is lg1.2 Pa·s;

[0083] Compressed air with a temperature of 450°C is sprayed from an air flow spraying device 3, the angle between the compressed air and the laser 2 is 20°, the nozzle of the air flow spraying device 3 adopts a circular port with a diameter of 10mm, the air flow spraying device 3 sprays air flow to the glass melt drop, the flow rate of the air flow is 40m / s, the glass melt drop is cooled to 450°C under the action of the air flow, at this time the viscosity of the glass melt drop is increased to lg5 Pa·s; at the same time, the air flow sprays the cooled glass melt drop to the surface of the magnesium-zinc alloy flat plate in time and adheres to the surface of the magnesium-zinc alloy flat plate, and finally forms a circular drop-shaped silicon-free bio-glass coating on the surface of the magnesium-zinc alloy flat plate as shown in Figure 2 ;

[0084] The magnesium-zinc alloy flat plate with the silicon-free bio-glass coating is subjected to bioactivity test and degradation behavior test, and in 14-day osteoblast culture, the cell activity optical value (OD / 450nm) of the osteoblasts at the 7th day and the 14th day is 0.7 and 1.1 respectively, and the degradation rate of the magnesium-zinc alloy flat plate in the 28-day simulated body fluid is about 0.08mm / day.

[0085] Example 3

[0086] A silicate bioglass sheet was prepared using raw materials for the silicate bioglass sheet including SiO2, B2O3, P2O5, CaO, MgO, and Na2O, and the molar ratio of the SiO2, B2O3, P2O5, CaO, MgO, and Na2O was 1:0.1:0.1:0.3:0.3:0.2. After the powders of the above raw materials were uniformly mixed, the powders were melted into a liquid at a temperature of 1200°C, and the liquid was maintained for 2 hours for homogenization. Then, the liquid was poured into a molding mold, and was integrally pressed to form a silicate bioglass sheet having a size of 200 mm x 200 mm and a thickness of 1 mm;

[0087] A magnesium-zinc alloy flat plate was used as a substrate, and a silicate bioglass sheet was placed above the magnesium-zinc alloy flat plate. The distance between the silicate bioglass sheet and the magnesium-zinc alloy flat plate was 90 mm.

[0088] Next, a laser 2 having a wavelength of 10.6 μm was emitted from a laser emitter 1. The laser 2 had a spot size of 1.5 cm 2 , a power of 15 kW / cm 2 , and a vertical distance of 150 mm between the emission port of the laser emitter 1 and the silicate bioglass sheet. The spot of the laser 2 irradiated the surface of the silicate bioglass sheet, and the spot of the laser 2 reciprocated at a rate of 0.2 m / min in the horizontal direction (XY axis direction). The silicate bioglass sheet in the spot area was rapidly heated to 1200°C and began to melt. After complete melting, a glass melt droplet was formed. The viscosity of the glass melt droplet was lg1.3 Pa·s.

[0089] Compressed air having a temperature of 480°C was sprayed from an air flow spraying device 3. The angle between the compressed air and the laser 2 was 15°. The air flow spraying device 3 had a circular port with a diameter of 10 mm. The air flow spraying device 3 sprayed an air flow to the glass melt droplet. The flow rate of the air flow was 40 m / s. The glass melt droplet was cooled to 480°C under the action of the air flow, and the viscosity of the glass melt droplet was increased to lg5.5 Pa·s. At the same time, the cooled glass melt droplet was sprayed onto the surface of the magnesium-zinc alloy flat plate in a timely manner, and was adhered to the surface of the magnesium-zinc alloy flat plate. Finally, an oval-shaped silicate bioglass coating layer was formed on the surface of the magnesium-zinc alloy flat plate as shown in FIG. 1. Figure 3

[0090] ​The magnesium-zinc alloy plate with the silicate bioglass coating was subjected to bioactivity test and degradation behavior test. In 14-day osteoblast culture, the cell viability optical density (OD / 450 nm) of the osteoblasts at the 7th day and the 14th day was 0.7 and 1.1 respectively, and the degradation rate of the magnesium-zinc alloy plate in the simulated body fluid for 28 days was about 0.07 mm / day.

[0091] Example 4

[0092] The raw materials for preparing the silicate-free bioglass sheet include P2O5, B2O3, Fe2O3, CaO, MgO and Na2O, and the molar ratio of the P2O5, B2O3, Fe2O3, CaO, MgO and Na2O is 1:0.22:0.11:0.44:0.33:0.11. After the raw materials are uniformly mixed, the mixture is melted into a liquid at a temperature of 1000°C and is kept for 2 hours for homogenization. Then, the liquid is poured into a forming mold for integrated press forming to obtain a silicate-free bioglass sheet with a size of 200 mm x 200 mm and a thickness of 1 mm.

[0093] The magnesium-zinc alloy plate is used as a substrate, and the silicate-free bioglass sheet is placed above the magnesium-zinc alloy plate. The distance between the silicate-free bioglass sheet and the magnesium-zinc alloy plate is 90 mm.

[0094] Then, a laser 2 with a wavelength of 10.6 μm is emitted from a laser emitter 1. The spot size of the laser 2 is 2.5 cm 2 , and the power is 10 kW / cm 2 . A vertical distance of 150 mm is kept between the emission port of the laser emitter 1 and the silicate-free bioglass sheet. The spot of the laser 2 irradiates the surface of the silicate-free bioglass sheet, and the spot of the laser 2 reciprocates in the horizontal direction (XY axis direction) at a rate of 0.2 m / min. The silicate-free bioglass sheet in the spot area is rapidly heated to 1050°C and starts to melt. After complete melting, a glass melt drop is formed. The viscosity of the glass melt drop is lg1.3 Pa·s.

[0095] Compressed air with a temperature of 430°C is sprayed from an air flow spraying device 3. The angle between the compressed air and the laser 2 is 20°. The nozzle of the air flow spraying device 3 is a circular port with a diameter of 10 mm. The air flow spraying device 3 sprays air flow to the glass melt drop. The flow rate of the air flow is 30 m / s. The glass melt drop is cooled to 430°C under the action of the air flow, and the viscosity of the glass melt drop is increased to lg5.5 Pa·s. At the same time, the cooled glass melt drop is timely sprayed to the surface of the magnesium-zinc alloy plate and adheres to the surface of the magnesium-zinc alloy plate. Finally, an oval-shaped silicate-free bioglass coating is formed on the surface of the magnesium-zinc alloy plate as shown in Figure 3 .

[0096] The magnesium-zinc alloy plate with the non-silicon bioglass coating was subjected to bioactivity test and degradation behavior test. In 14-day osteoblast culture, the cell viability optical density (OD / 450 nm) of the osteoblasts at the 7th day and the 14th day was 0.8 and 1.2 respectively, and the degradation rate of the magnesium-zinc alloy plate in the 28-day simulated body fluid was about 0.06 mm / day.

[0097] Example 5

[0098] A silicate bioglass sheet was prepared using raw materials including SiO2, B2O3, P2O5, CaO, MgO and Na2O, the molar ratio of the SiO2, B2O3, P2O5, CaO, MgO and Na2O being 1:0.11:0.22:0.44:0.22:0.22; after the raw materials were mixed uniformly, the mixture was melted into a liquid at a temperature of 1200°C and kept for 2 hours for homogenization, and then the liquid was poured into a forming mold for integrated press forming to obtain a silicate bioglass sheet with a size of 200 mm x 200 mm and a thickness of 1 mm;

[0099] The magnesium-calcium alloy plate was used as a substrate, and the silicate bioglass sheet was placed above the magnesium-calcium alloy plate, the distance between the silicate bioglass sheet and the magnesium-calcium alloy plate being 60 mm;

[0100] Then, a laser 2 with a wavelength of 10.6 μm was emitted from a laser emitter 1, the spot size of the laser 2 being 3 cm 2 , the power being 15 kW / cm 2 , the vertical distance between the emitting port of the laser emitter 1 and the silicate bioglass sheet being 150 mm, the spot of the laser 2 irradiating the surface of the silicate bioglass sheet, and the spot of the laser 2 reciprocating in the horizontal direction (XY axis direction) at a rate of 0.1 m / min, the silicate bioglass sheet in the spot area being rapidly heated to 1250°C and starting to melt, and after complete melting, a glass melt drop was formed, the viscosity of the glass melt drop being lg1.4 Pa·s;

[0101] Compressed air with a temperature of 450°C was sprayed from an air flow spraying device 3, the angle between the compressed air and the laser 2 being 15°, the nozzle of the air flow spraying device 3 being a circular port with a diameter of 20 mm, the air flow spraying device 3 spraying air flow to the glass melt drop, the flow rate of the air flow being 50 m / s, the glass melt drop being cooled to 450°C under the action of the air flow, at which time the viscosity of the glass melt drop was increased to lg6 Pa·s; at the same time, the air flow sprayed the cooled glass melt drop to the surface of the magnesium-calcium alloy plate in time and adhered to the surface of the magnesium-calcium alloy plate, and finally a coating layer was formed on the surface of the magnesium-calcium alloy plate as shown in Figure 4fibrous silicate bioglass coating is shown;

[0102] The magnesium-calcium alloy plate with the silicate bioglass coating was subjected to bioactivity test and degradation behavior test. In 14-day osteoblast culture, the cell viability optical density (OD / 450 nm) of the osteoblasts at the 7th day and the 14th day was 0.8 and 1.6 respectively, and the degradation rate of the magnesium-calcium alloy plate in 28-day simulated body fluid was about 0.04 mm / day.

[0103] Example 6

[0104] A silicate-free bioglass sheet was prepared using raw materials including P2O5, B2O3, Fe2O3, CaO, MgO and Na2O, the molar ratio of the P2O5, B2O3, Fe2O3, CaO, MgO and Na2O being 1:0.22:0.11:0.44:0.33:0.11. After the raw materials were mixed uniformly, the mixture was melted into a liquid at a temperature of 1000°C and kept for 2 hours for homogenization. Then the liquid was poured into a forming mold for integrated press forming to obtain a silicate-free bioglass sheet with a size of 200 mm x 200 mm and a thickness of 1 mm.

[0105] The magnesium-calcium alloy plate was used as a substrate, and the silicate-free bioglass sheet was placed above the magnesium-calcium alloy plate, with a distance of 60 mm between the silicate-free bioglass sheet and the magnesium-calcium alloy plate.

[0106] Then a laser 2 with a wavelength of 10.6 μm was emitted from a laser emitter 1, the laser 2 having a spot size of 3 cm 2 , and a power of 10 kW / cm 2 . A vertical distance of 150 mm was kept between the emission port of the laser emitter 1 and the silicate-free bioglass sheet. The spot of the laser 2 irradiated the surface of the silicate-free bioglass sheet, and the spot of the laser 2 reciprocated in the horizontal direction (XY axis direction) at a rate of 0.05 m / min. The silicate-free bioglass sheet in the spot area was rapidly heated to 1100°C and started to melt. After complete melting, a glass melt drop was formed, and the viscosity of the glass melt drop was lg1.4 Pa·s.

[0107] Compressed air with a temperature of 400°C was sprayed from an air flow spraying device 3, and the angle between the compressed air and the laser 2 was 20°. The air flow spraying device 3 had a circular port with a diameter of 20 mm. The air flow spraying device 3 sprayed air flow to the glass melt drop, and the flow rate of the air flow was 50 m / s. The glass melt drop was cooled to 400°C under the action of the air flow, and the viscosity of the glass melt drop was increased to lg6 Pa·s. At the same time, the cooled glass melt drop was sprayed onto the surface of the magnesium-calcium alloy plate in time and adhered to the surface of the magnesium-calcium alloy plate. Finally, a coating layer as shown inFigure 4 fibrous silicate bioglass coating;

[0108] The magnesium-calcium alloy flat plate with the silicate bioglass coating was subjected to bioactivity test and degradation behavior test. In 14-day osteoblast culture, the cell viability optical density (OD / 450 nm) of the osteoblasts at the 7th day and the 14th day was 1.0 and 1.7, respectively; the degradation rate of the magnesium-calcium alloy flat plate in 28-day simulated body fluid was about 0.04 mm / day.

[0109] Example 7

[0110] A silicate bioglass sheet was prepared using raw materials for preparing the silicate bioglass sheet, the raw materials including SiO2, B2O3, P2O5, CaO, MgO and Na2O, and the molar ratio of the SiO2, B2O3, P2O5, CaO, MgO and Na2O being 1:0.1:0.1:0.3:0.3:0.2; the powders of the above raw materials were uniformly mixed, then melted into a liquid at a temperature of 1200°C, and kept for 2 hours for homogenization, and then the liquid was poured into a forming mold for integrated compression molding to obtain a silicate bioglass sheet with a size of 200 mm x 200 mm and a thickness of 1 mm;

[0111] The magnesium-calcium alloy flat plate was used as a substrate, and the silicate bioglass sheet was placed above the magnesium-calcium alloy flat plate, with a distance of 80 mm between the silicate bioglass sheet and the magnesium-calcium alloy flat plate;

[0112] Then, a laser 2 with a wavelength of 10.6 μm was emitted from the laser emitter 1, the laser 2 having a spot size of 3 cm 2 , a power of 20 kW / cm 2 , and a vertical distance of 100 mm between the emission port of the laser emitter 1 and the silicate bioglass sheet; the spot of the laser 2 irradiated the surface of the silicate bioglass sheet, and the spot of the laser 2 reciprocated in the horizontal direction (XY axis direction) at a rate of 0.2 m / min; the silicate bioglass sheet in the spot area was rapidly heated to 1250°C and began to melt, and after complete melting, a glass melt drop was formed, the viscosity of the glass melt drop being lg1.2 Pa·s;

[0113] compressed air with a temperature of 500 DEG C is sprayed from the airflow spraying device 3, the angle between the compressed air and the laser 2 is 15 DEG, the nozzle of the airflow spraying device 3 adopts a circular opening with a diameter of 30 mm, the airflow spraying device 3 sprays the air flow to the glass melt droplet, the flow rate of the air flow is 50 m / s, the glass melt droplet is cooled to 500 DEG C under the action of the air flow, at this time the viscosity of the glass melt droplet is increased to lg5 Pa·s; at the same time, the air flow sprays the cooled glass melt droplet to the surface of the magnesium-calcium alloy flat plate in time and adheres to the surface of the magnesium-calcium alloy flat plate, and finally densely stacks to form a silicate bioglass coating layer with a surface shape as shown in Figure 5 ;

[0114] The magnesium-calcium alloy flat plate with the silicate bioglass coating layer is subjected to bioactivity test and degradation behavior test, in 14-day osteoblast culture, the cell activity optical density (OD / 450 nm) of the osteoblasts at the 7th day and the 14th day is 1.1 and 1.8 respectively; the degradation rate of the magnesium-calcium alloy flat plate in the 28-day simulated body fluid is about 0.02 mm / day.

[0115] Example 8

[0116] A silicon-free bioglass sheet is prepared, the raw materials for preparing the silicon-free bioglass sheet include P2O5, B2O3, Fe2O3, CaO, MgO and Na2O, the molar ratio of the P2O5, B2O3, Fe2O3, CaO, MgO and Na2O is 1:0.22:0.11:0.44:0.33:0.11; after the above raw materials are uniformly mixed, the mixture is melted into a liquid at a temperature of 1000 DEG C, and is kept for 2 hours for homogenization, then the liquid is poured into a forming mold for integrated compression molding to obtain a silicon-free bioglass sheet with a size of 200 mm*200 mm and a thickness of 1 mm;

[0117] The magnesium-calcium alloy flat plate is used as a substrate, and the silicon-free bioglass sheet is placed above the magnesium-calcium alloy flat plate, the distance between the silicon-free bioglass sheet and the magnesium-calcium alloy flat plate is 80 mm;

[0118] Then the laser 2 with a wavelength of 10.6 μm is emitted from the laser emitter 1, the spot size of the laser 2 is 3 cm 2 , the power is 20 kW / cm 2 , the vertical distance between the emission port of the laser emitter 1 and the silicon-free bioglass sheet is 100 mm, the spot of the laser 2 irradiates the surface of the silicon-free bioglass sheet, and the spot of the laser 2 reciprocates in the horizontal direction (XY axis direction) at a rate of 0.2 m / min, the silicon-free bioglass sheet in the spot area is rapidly heated to 1100 DEG C and starts to melt, after complete melting, glass melt droplets are formed, and the viscosity of the glass melt droplets is lg1.2 Pa·s;

[0119] compressed air with a temperature of 450℃ is sprayed from the airflow spraying device 3, the angle between the compressed air and the laser 2 is 20°, the nozzle of the airflow spraying device 3 adopts a circular port with a diameter of 30mm, the airflow spraying device 3 sprays the air flow to the glass melt droplet, the flow rate of the air flow is 50m / s, the glass melt droplet is cooled to 450℃ under the action of the air flow, at this time the viscosity of the glass melt droplet is increased to lg5 Pa·s; at the same time, the air flow sprays the cooled glass melt droplet to the surface of the magnesium-calcium alloy plate in time and adheres to the surface of the magnesium-calcium alloy plate, and finally densely stacks on the surface of the magnesium-calcium alloy plate to form a planar silicon-free bioactive glass coating as shown in Figure 5 ;

[0120] The magnesium-calcium alloy plate with the silicon-free bioactive glass coating is subjected to bioactivity test and degradation behavior test, in 14-day osteoblast culture, the cell activity optical value (OD / 450nm) of the osteoblasts at the 7th day and the 14th day is 1.2 and 1.9 respectively, and the degradation rate of the magnesium-calcium alloy plate in the 28-day simulated body fluid is about 0.02mm / day.

[0121] Comparative Example 1

[0122] The magnesium-zinc alloy plate without the bioactive glass coating is subjected to bioactivity test and degradation behavior test, in 14-day osteoblast culture, the cell activity optical value (OD / 450nm) of the osteoblasts at the 7th day and the 14th day is 0.3 and 0.5 respectively, and the degradation rate of the magnesium-zinc alloy plate in the 28-day simulated body fluid is about 0.15mm / day.

[0123] Comparative Example 2

[0124] The magnesium-calcium alloy plate without the bioactive glass coating is subjected to bioactivity test and degradation behavior test, in 14-day osteoblast culture, the cell activity optical value (OD / 450nm) of the osteoblasts at the 7th day and the 14th day is 0.4 and 0.6 respectively, and the degradation rate of the magnesium-calcium alloy plate in the 28-day simulated body fluid is about 0.14mm / day.

[0125] Comparative Example 3

[0126] According to the molar ratio of raw materials of silicate bioglass system SiO2, B2O3, P2O5, CaO, MgO and Na2O 1:0.11:0.22:0.44:0.22:0.22, the bioglass gel solution is configured by sol-gel method. The corresponding salt compounds of each formula component are mixed in proportion, including tetraethyl orthosilicate (TEOS), triethyl phosphate (TEP), boric acid (H3BO3), sodium nitrate (NaNO3), calcium nitrate (Ca(NO3)2), magnesium nitrate (Mg(NO3)2), to obtain a bioglass sol-gel solution. The magnesium-calcium alloy flat plate is immersed in the sol-gel solution, aged at room temperature for 24 h, dried at 60°C for 1 h, and heat treated at 400°C for 90 min to build a bioglass coating on the magnesium-calcium alloy flat plate.

[0127] The magnesium-calcium alloy flat plate with a bioglass coating is subjected to bioactivity test and degradation behavior test. In 14-day osteoblast culture, the cell activity optical density (OD / 450nm) of osteoblasts at 7th day and 14th day is 0.6 and 1.0 respectively, and the degradation rate of magnesium-calcium alloy flat plate in 28-day simulated body fluid is about 0.07 mm / day.

[0128] Table 1

[0129]

[0130] As can be seen from the test results in the table, the magnesium alloy flat plate with a bioglass coating prepared in Examples 1-8 has good cell activity of osteoblasts in 14-day osteoblast culture, and the magnesium alloy flat plate has a low degradation rate. The cell activity optical density of osteoblasts at 7th day is 0.5, 0.7, 0.7, 0.8, 0.8, 1.0, 1.1 and 1.2 respectively, and the cell activity optical density of osteoblasts at 14th day is 0.9, 1.1, 1.1, 1.2, 1.6, 1.7, 1.8 and 1.9 respectively, and the degradation rate of magnesium alloy flat plate in 28-day simulated body fluid is 0.12 mm / day, 0.08 mm / day, 0.07 mm / day, 0.06 mm / day, 0.04 mm / day, 0.04 mm / day, 0.02 mm / day and 0.02 mm / day respectively.

[0131] Comparative Examples 1-4 and Comparative Example 1, Examples 1-4 are bioactivity test and degradation behavior test on magnesium-zinc alloy flat plate with silicate bioglass coating or with non-silicon bioglass coating, in 14-day osteoblast culture, the cell activity light value degree of osteoblasts at 7th day is 0.5, 0.7, 0.7 and 0.8, the cell activity light value degree of osteoblasts at 14th day is 0.9, 1.1, 1.1 and 1.2 respectively, the degradation rate of magnesium-zinc alloy flat plate in 28-day simulated body fluid is 0.12 mm / day, 0.08 mm / day, 0.07 mm / day and 0.06 mm / day; while Comparative Example 1 is bioactivity test and degradation behavior test on magnesium-zinc alloy flat plate, in 14-day osteoblast culture, the cell activity light value degree of osteoblasts at 7th day is 0.3, the cell activity light value degree of osteoblasts at 14th day is 0.5, the degradation rate of magnesium-zinc alloy flat plate in 28-day simulated body fluid is 0.15 mm / day; thus it can be seen that the cell activity of osteoblasts on magnesium-zinc alloy flat plate with silicate bioglass coating or with non-silicon bioglass coating is stronger, and the degradation rate of magnesium-zinc alloy flat plate in 28-day simulated body fluid is lower.

[0132] Comparative Examples 5-8 and Comparative Example 2, Examples 5-8 are bioactivity test and degradation behavior test on magnesium-calcium alloy flat plate with silicate bioglass coating or with non-silicon bioglass coating, in 14-day osteoblast culture, the cell activity light value degree of osteoblasts at 7th day is 0.8, 1.0, 1.1 and 1.2, the cell activity light value degree of osteoblasts at 14th day is 1.6, 1.7, 1.8 and 1.9, the degradation rate of magnesium-calcium alloy flat plate in 28-day simulated body fluid is 0.04 mm / day, 0.04 mm / day, 0.02 mm / day and 0.02 mm / day; while Comparative Example 2 is bioactivity test and degradation behavior test on magnesium-calcium alloy flat plate, in 14-day osteoblast culture, the cell activity light value degree of osteoblasts at 7th day is 0.4, the cell activity light value degree of osteoblasts at 14th day is 0.6, the degradation rate of magnesium-calcium alloy flat plate in 28-day simulated body fluid is 0.14 mm / day; thus it can be seen that the cell activity of osteoblasts on magnesium-calcium alloy flat plate with silicate bioglass coating or with non-silicon bioglass coating is stronger, and the degradation rate of magnesium-calcium alloy flat plate in 28-day simulated body fluid is lower.

[0133] Comparative Example 5, Example 7 and Comparative Example 3, Example 5 and Example 7 use laser method to construct bio-glass coating on magnesium-calcium alloy flat plate, bioactivity test and degradation behavior test are carried out on magnesium-calcium alloy flat plate with silicate bio-glass coating, in 14-day osteoblast culture, the cell viability light value of osteoblasts at 7th day is 0.8 and 1.1 respectively, the cell viability light value of osteoblasts at 14th day is 1.6 and 1.8 respectively, the degradation rate of magnesium-calcium alloy flat plate in 28-day simulated body fluid is 0.04 mm / day and 0.02 mm / day respectively; while Comparative Example 3 uses sol-gel method to construct bio-glass coating on magnesium-calcium alloy flat plate, bioactivity test and degradation behavior test are carried out on magnesium-calcium alloy flat plate with silicate bio-glass coating, in 14-day osteoblast culture, the cell viability light value of osteoblasts at 7th day is 0.6, the cell viability light value of osteoblasts at 14th day is 1.0, the degradation rate of magnesium-calcium alloy flat plate in 28-day simulated body fluid is 0.07 mm / day; thus it can be seen that the cell viability of osteoblasts on magnesium-calcium alloy flat plate with bio-glass laser coating constructed by laser is stronger, and the degradation rate of magnesium-calcium alloy flat plate in 28-day simulated body fluid is lower. It is further confirmed that compared with sol-gel method for constructing bio-glass coating, laser forming bio-glass coating has better bioactivity and magnesium alloy degradation regulation.

[0134] The above describes the preferred embodiments of the present application, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including various technical features being combined in any other suitable manner, and these simple modifications and combinations should also be considered as disclosed by the present application, and all fall within the protection scope of the present application.

Claims

1. A method for constructing a bioglass coating on a magnesium alloy surface, characterized in that: The method comprises the following steps: Step 1: using a laser (2) emitted by a laser emitter (1) to irradiate a bioglass sheet (5) to form a glass droplet; Step 2: using an air flow (4) generated by an air flow blowing device (3) to spray the glass droplets onto the surface of the magnesium alloy (7), thereby constructing a bioglass coating (6) on the surface of the magnesium alloy (7); The bioglass sheet (5) is a silicate bioglass sheet or a silicon-free bioglass sheet; The raw materials for preparing the silicate bioglass sheet include SiO2, B2O3, P2O5, CaO, MgO and Na2O, and the molar ratio of SiO2, B2O3, P2O5, CaO, MgO and Na2O is 1:0.018-0.25:0.09-0.38:0.09-0.63:0.055-0.38:0.009-0.25; The raw materials for preparing the silicon-free bioglass sheet include P2O5, B2O3, Fe2O3, CaO, MgO and Na2O, and the molar ratio of P2O5, B2O3, Fe2O3, CaO, MgO and Na2O is 1:0.05-0.33:0.05-0.33:0.17-0.56:0.083-0.44:0.008-0.

11.

2. The method for constructing a bioglass coating on a magnesium alloy surface according to claim 1, characterized in that: The thickness of the bioglass sheet (5) is 0.5-2 mm.

3. The method for constructing a bioglass coating on a magnesium alloy surface according to claim 1, wherein: The wavelength of the laser (2) is 8-12 μm and the spot size is 1-10 cm. 2 , power is 5-20kW / cm 2 .

4. The method for constructing a bioglass coating on a magnesium alloy surface according to claim 1, wherein: The temperature of the molten glass droplet is 1000-1400°C.

5. The method for constructing a bioglass coating on a magnesium alloy surface according to claim 1, characterized in that: The viscosity of the glass droplet is lg1.2-lg1.5 Pa∙s.

6. The method for constructing a bioglass coating on a magnesium alloy surface according to claim 1, characterized in that: The angle between the airflow (4) and the laser (2) is 10-45°.

7. The method for constructing a bioglass coating on a magnesium alloy surface according to claim 1, wherein: The temperature of the air flow (4) is 300-500°C; The flow rate of the air flow (4) is 10-50 m / s.

8. The method for constructing a bioglass coating on a magnesium alloy surface according to claim 1, wherein: The air flow (4) is a dry compressed air flow, a nitrogen flow, an argon flow or a helium flow.

9. The method for constructing a bioglass coating on a magnesium alloy surface according to claim 1, characterized in that: The bioglass coating (6) covers the surface of the magnesium alloy (7) in a shape of a droplet, an ellipse, a fiber, or a surface.

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