A composite spray method for a metal gradient coating on a quartz glass surface

Abstract

The application discloses a composite spraying method for a metal gradient coating on a quartz glass surface and relates to a composite spraying method for a coating. In order to solve the problem that the existing glass surface metalized coating is easy to fail, the application combines cold spraying and plasma spraying technologies, controls relevant parameters of two jet flows, and thus obtains a metal gradient coating on the quartz glass surface. The coating gradually transits from silica to aluminum alloy from the glass base side to the outer surface, the coating performance changes accordingly, the dense sealing between the glass and the metal can be realized, and the problem that the matching of the linear expansion coefficients of the glass and the metal is poor can be effectively avoided. The bonding surface between the coating and the base is obtained by plasma spraying and high-temperature fusion of the homogeneous material, so that the coating and the base are integrated.

Description

Technical Field

[0001] This invention relates to a composite spraying method for coatings. Background Technology

[0002] Quartz glass possesses excellent optical, electrical, and chemical properties, making it widely used in optical devices, instruments, semiconductors, the automotive industry, and aerospace. In practical applications, quartz glass is often used in conjunction with metal materials such as aluminum alloys and magnesium alloys. Particularly in applications such as precision device manufacturing, electronic packaging, solar energy concentrators, and military equipment, higher demands are placed on the bonding between glass and metal. Effective glass-metal bonding is also one of the key problems that urgently needs to be solved in many fields.

[0003] The main challenge in glass-metal bonding lies in the poor wettability caused by the compositional differences between glass and metal. Furthermore, poor compatibility between glass and metal is also a key factor affecting bonding performance, such as significant differences in thermal expansion coefficients, material plasticity, and toughness. Common glass-metal bonding methods include brazing, laser welding, adhesive bonding, sealing, and bonding. Among these, brazing easily generates significant residual thermal stress at the weld joint, leading to glass-metal bonding failure. Laser welding is mainly used for joining small objects, while adhesive bonding is susceptible to environmental influences and has poor repeatability in production quality. Wang Jiqiang et al. proposed a method for preparing a high-strength metallized coating on glass surfaces, using a single cold spraying method to directly spray pure metal onto the glass surface, thereby achieving glass surface metallization. Yang Chao proposed a method for glass surface metallization using plasma technology, employing a plasma spraying method to sequentially spray two transition intermediate coatings onto the glass substrate surface at high speed to form a strong bond with the glass. Xu Jian et al. proposed a method for selective metallization of glass surfaces using femtosecond lasers, mainly employing femtosecond lasers and chemical copper plating solutions to achieve glass surface metallization. These technologies enable glass-metal bonding or metallization of glass surfaces. However, due to the poor compatibility between glass and metal, subsequent glass-metal connectors are prone to failure at the joint. Alternatively, if the bonding of homogeneous materials is not achieved, defects may easily occur at the interface during service, leading to coating failure. Summary of the Invention

[0004] In order to solve the problem of easy failure of existing metallized coatings on glass surfaces, this invention proposes a composite spraying method for metal gradient coatings on quartz glass surfaces.

[0005] The composite spraying method for a metal gradient coating on a quartz glass surface according to the present invention is carried out according to the following steps:

[0006] Step 1: First, roughen the surface of the quartz glass by sandblasting, then clean it with ultrasonic cleaning and air drying, and finally fix it on the rotating table.

[0007] The rotating platform is parallel to the ground, and the quartz glass is vertically fixed on the rotating platform.

[0008] Step 2: Fill the powder feeders of the cold spraying equipment and the plasma spraying equipment with aluminum alloy powder and silica powder respectively; adjust the angle between the cold spraying gun and the quartz glass surface to 70-90°, and the angle between the plasma spraying gun and the quartz glass surface to 70-90°. Set up a heat insulation baffle between the two spray guns. The distance between the nozzle of the cold spraying gun and the quartz glass surface should be 4-7cm; the distance between the nozzle of the plasma spraying gun and the quartz glass surface should also be 4-7cm.

[0009] The particle size of the aluminum alloy powder is 30-50 μm;

[0010] The particle size of the silica powder is 30-50 μm;

[0011] The aluminum alloy powder is 6061 aluminum alloy;

[0012] Step 3: Cold spraying uses nitrogen as the powder feeding gas; plasma spraying uses argon as the main gas and powder feeding gas, and helium as the secondary gas and plasma gas.

[0013] Step Four

[0014] First, turn on the rotary table to synchronize the rotation of the quartz glass with the rotary table; then turn on the plasma spraying equipment and begin spraying silica powder. After 3-5 seconds, turn on the cold spraying equipment to begin spraying aluminum alloy powder; the feed rate of silica powder at the start of silica powder spraying is 49.1-58.8 cm. 3 / min; the initial powder feed rate for aluminum alloy powder is 3.9-5.9cm. 3 / min; During the spraying process, gradually reduce the feed rate of silica powder to 0m. 3 The feed rate of silica powder decreased by 49.1-73.5 cm / min. 3 / min 2 Simultaneously, the feed rate of aluminum alloy powder is gradually increased, with an increase rate of 24.5-36.8 cm. 3 / min 2 When the feed rate of silica powder is reduced to 0m 3 When the plasma spraying equipment is turned off at a certain speed, the aluminum alloy is sprayed to the target thickness.

[0015] During the process of spraying silica powder, the voltage of the plasma spraying equipment is 32-35V, the current is 700-800A, and the flow rates of argon and helium are 5-65SLM and 30-40SLM, respectively.

[0016] During the aluminum alloy powder spraying process, the flow rate of the cold spray powder feeding gas is 200-300 SLM, the chamber pressure is 3.5-5.5 MPa, and the gun chamber temperature is 550-600℃.

[0017] The rotational speed of the rotary table is set within the range of 50-150 r / min.

[0018] Principles and beneficial effects of this invention:

[0019] 1. This invention innovatively combines cold spraying and plasma spraying technologies. High-melting-point silica particles are sprayed as molten droplets onto a fused quartz glass substrate using a plasma spraying gun to form a strong bond. Aluminum alloy particles are injected as solid particles into the silica droplets using a cold spraying gun under high-speed airflow acceleration. By controlling the relevant parameters of the two jets, a metal gradient coating is obtained on the quartz glass surface. The coating gradually transitions from silica to aluminum alloy from the glass substrate side to the outer surface, causing the coating properties to change accordingly. This not only achieves a tight bond between the glass and the metal but also effectively avoids the problem of poor matching of the linear expansion coefficients of glass and metal. Furthermore, the bonding surface between the coating and the substrate is achieved by high-temperature fusion of homogeneous materials through plasma spraying, making the coating and substrate integrated.

[0020] 2. This invention employs plasma spraying to melt silica particles into droplets at extremely high temperatures in a spray gun, while the plasma arc preheats the glass substrate and the spraying area. During the plasma spraying process, due to heat transfer and radiation, the high-temperature droplets and the plasma arc locally soften the surface of the substrate in the spraying area, causing the droplets and substrate to fuse together and form a strong bond, providing a foundation for a high-bonding coating. Furthermore, quartz glass, as an amorphous material, possesses excellent physicochemical properties due to its unique tetrahedral network structure, such as an extremely low coefficient of thermal expansion, high temperature resistance, and excellent chemical stability. This means that when locally heated, the overall heating effect on the substrate is minimal, thus largely avoiding stress cracking and inclusion problems caused by localized high heat input during plasma spraying.

[0021] 3. This invention employs high-pressure cold spraying to inject aluminum alloy particles into the aforementioned silica droplets. Since plasma spraying uses argon and helium, while cold spraying uses nitrogen, oxidation problems are effectively prevented when spraying aluminum alloys in an atmospheric environment. Simultaneously, at a higher temperature, the aluminum alloy particles are encapsulated and fused within the silica droplets, resulting in a strong bond between the particles.

[0022] 4. This invention employs a combination of cold spraying and plasma spraying technologies. By adjusting the powder feeding parameters of the two devices, the powder output ratio of the two spray beams is adjusted, thereby controlling the gradient change of the composite coating. The gradient composite coating design is flexible, and theoretically, composite coatings of any thickness can be sprayed. Furthermore, the combined spraying technology achieves the spraying process directly in an atmospheric environment, exhibiting low dependence on the production environment, strong anti-interference capabilities, and suitability for large-scale mass production. It also boasts advantages such as high production efficiency, high raw material utilization, and high coating bonding strength. Attached Figure Description

[0023] Figure 1 This is a photograph of the metal gradient coating on the surface of the quartz glass prepared in Example 1.

[0024] Figure 2 This is a scanning electron microscope image of the metal gradient coating on the surface of the quartz glass prepared in Example 1;

[0025] Figure 3 The energy spectrum (Al element) of the metal gradient coating on the surface of the quartz glass prepared in Example 1;

[0026] Figure 4 The energy spectrum (Si element) of the metal gradient coating on the surface of the quartz glass prepared in Example 1 is shown. Detailed Implementation

[0027] The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any reasonable combination of the specific embodiments.

[0028] Specific Implementation Method 1: The composite spraying method for the metal gradient coating on the quartz glass surface in this implementation method is carried out according to the following steps:

[0029] Step 1: First, roughen the surface of the quartz glass by sandblasting, then clean it with ultrasonic cleaning and air drying, and finally fix it on the rotating table.

[0030] The rotating platform is parallel to the ground, and the quartz glass is vertically fixed on the rotating platform.

[0031] Step 2: Fill the powder feeders of the cold spraying equipment and the plasma spraying equipment with aluminum alloy powder and silica powder respectively; adjust the angle between the cold spraying gun and the quartz glass surface to 70-90°, and the angle between the plasma spraying gun and the quartz glass surface to 70-90°. Set up a heat insulation baffle between the two spray guns. The distance between the nozzle of the cold spraying gun and the quartz glass surface should be 4-7cm; the distance between the nozzle of the plasma spraying gun and the quartz glass surface should also be 4-7cm.

[0032] The particle size of the aluminum alloy powder is 30-50 μm;

[0033] The particle size of the silica powder is 30-50 μm;

[0034] The aluminum alloy powder is 6061 aluminum alloy;

[0035] Step 3: Cold spraying uses nitrogen as the powder feeding gas; plasma spraying uses argon as the main gas and powder feeding gas, and helium as the secondary gas and plasma gas.

[0036] Step 4

[0037] First, turn on the rotary table to synchronize the rotation of the quartz glass with the rotary table; then turn on the plasma spraying equipment and begin spraying silica powder. After 3-5 seconds, turn on the cold spraying equipment to begin spraying aluminum alloy powder; the feed rate of silica powder at the start of silica powder spraying is 49.1-58.8 cm. 3 / min; the initial powder feed rate for aluminum alloy powder is 3.9-5.9cm. 3 / min; During the spraying process, gradually reduce the feed rate of silica powder to 0m. 3 The feed rate of silica powder decreased by 49.1-73.5 cm / min. 3 / min 2 Simultaneously, the feed rate of aluminum alloy powder is gradually increased, with an increase rate of 24.5-36.8 cm. 3 / min 2 When the feed rate of silica powder is reduced to 0m 3 When the plasma spraying equipment is turned off at a certain speed, the aluminum alloy is sprayed to the target thickness.

[0038] During the process of spraying silica powder, the voltage of the plasma spraying equipment is 32-35V, the current is 700-800A, and the flow rates of argon and helium are 5-65SLM and 30-40SLM, respectively.

[0039] During the aluminum alloy powder spraying process, the flow rate of the cold spray powder feeding gas is 200-300 SLM, the chamber pressure is 3.5-5.5 MPa, and the gun chamber temperature is 550-600℃.

[0040] The rotational speed of the rotary table is set within the range of 50-150 r / min.

[0041] This embodiment has the following beneficial effects:

[0042] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that: 18μm alumina particles are used in the sandblasting roughening treatment described in step one, and compressed air is used to blow away the impurities remaining on the surface of the quartz glass after the sandblasting roughening treatment.

[0043] Specific Implementation Method 3: This implementation method differs from Specific Implementation Method 1 or 2 in that: the ultrasonic cleaning in step 1 uses anhydrous ethanol as the cleaning agent, and the ultrasonic cleaning time is 10 minutes.

[0044] Specific Implementation Method Four: This implementation method differs from one of the specific implementation methods one to three in that the quartz glass mentioned in step one is frosted quartz glass or transparent quartz glass.

[0045] Specific Implementation Method 5: This implementation method differs from Specific Implementation Methods 1 to 4 in that the purity of the aluminum alloy powder described in step 2 is 99.9%.

[0046] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that the purity of the silica powder mentioned in step two is 99.9%.

[0047] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that: during the aluminum alloy powder spraying process described in step four, the flow rate of the cold spray powder feeding gas is 200-300 SLM, the chamber pressure is 4 MPa, and the gun chamber temperature is 600℃.

[0048] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods One to Seven in that the purity of nitrogen, argon, and helium in step three is 99.9%.

[0049] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One through Eight in that: in step four, the rotary table is first turned on to make the quartz glass rotate synchronously with the rotary table; then the plasma spraying equipment is turned on and the silica powder is sprayed; after 5 seconds, the cold spraying equipment is turned on to start spraying the aluminum alloy powder; the feed rate of the silica powder at the start of the silica powder spraying is 49.1 cm. 3 / min; The initial powder feed rate for aluminum alloy powder spraying is 4.9cm. 3 / min; During the spraying process, gradually reduce the feed rate of silica powder to 0m. 3 / min, the rate of decrease in silica powder feed rate is 58.8cm. 3 / min 2 Simultaneously, the feed rate of aluminum alloy powder was gradually increased, with an increase rate of 29.4 cm. 3 / min 2 When the feed rate of silica powder is reduced to 0m 3When the plasma spraying equipment is turned off at a certain speed, the aluminum alloy is sprayed to the target thickness.

[0050] Specific Implementation Method Ten: This implementation method differs from Specific Implementation Methods One through Nine in that: in step four, the rotary table is first turned on to make the quartz glass rotate synchronously with the rotary table; then the plasma spraying equipment is turned on and the silica powder is sprayed; after 5 seconds, the cold spraying equipment is turned on to start spraying the aluminum alloy powder; the feed rate of the silica powder is 53.9 cm when the silica powder is first sprayed. 3 / min; The initial powder feed rate for aluminum alloy powder is 4.4cm. 3 / min; During the spraying process, gradually reduce the feed rate of silica powder to 0m. 3 / min, the rate of decrease in silica powder feed rate is 65.3cm. 3 / min 2 Simultaneously, the feed rate of aluminum alloy powder was gradually increased, with an increase rate of 32.6 cm. 3 / min 2 When the feed rate of silica powder is reduced to 0m 3 When the plasma spraying equipment is turned off at a certain speed, the aluminum alloy is sprayed to the target thickness.

[0051] Example 1

[0052] The composite spraying method for the metal gradient coating on the quartz glass surface in this embodiment is carried out according to the following steps:

[0053] Step 1: First, roughen the surface of the quartz glass by sandblasting, then clean it with ultrasonic cleaning and air drying, and finally fix it on the rotating table.

[0054] The sandblasting roughening treatment uses 18μm alumina particles, and after the sandblasting roughening treatment, compressed air is used to blow away the impurities remaining on the surface of the quartz glass.

[0055] The ultrasonic cleaning uses anhydrous ethanol as the cleaning agent, and the ultrasonic cleaning time is 10 minutes.

[0056] The quartz glass is columnar;

[0057] The rotating platform is parallel to the ground, and the quartz glass is vertically fixed on the rotating platform.

[0058] Step 2: Fill the powder feeders of the cold spraying equipment and the plasma spraying equipment with aluminum alloy powder and silica powder respectively; adjust the angle between the cold spraying gun and the quartz glass surface to 90°, and the angle between the plasma spraying gun and the quartz glass surface to 90°. Set a heat insulation baffle between the two spray guns. The distance between the nozzle of the cold spraying gun and the quartz glass surface should be 4cm. The distance between the nozzle of the plasma spraying gun and the quartz glass surface should also be 4cm.

[0059] The aluminum alloy powder has a purity of 99.9% and a particle size of 33 μm;

[0060] The silica powder has a purity of 99.9% and a particle size of 35 μm.

[0061] The aluminum alloy powder is 6061 aluminum alloy;

[0062] Step 3: Cold spraying uses nitrogen as the powder feeding gas; plasma spraying uses argon as the main gas and powder feeding gas, and helium as the secondary gas and plasma gas.

[0063] The purity of the nitrogen, argon, and helium is 99.9%.

[0064] Step Four

[0065] First, turn on the rotary table to synchronize the rotation of the quartz glass with the rotary table; then turn on the plasma spraying equipment and begin spraying silica powder. After 5 seconds, turn on the cold spraying equipment to begin spraying aluminum alloy powder; the silica powder feed rate is 49.1 cm when the silica powder spraying begins. 3 / min; The initial powder feed rate for aluminum alloy powder spraying is 4.9cm. 3 / min; During the spraying process, gradually reduce the feed rate of silica powder to 0m. 3 / min, the rate of decrease in silica powder feed rate is 58.8cm. 3 / min 2 Simultaneously, the feed rate of aluminum alloy powder was gradually increased, with an increase rate of 29.4 cm. 3 / min 2 When the feed rate of silica powder is reduced to 0m 3 When the plasma spraying equipment is turned off at a certain speed, the aluminum alloy is sprayed to the target thickness.

[0066] During the process of spraying silica powder, the voltage of the plasma spraying equipment is 32V, the current is 700A, and the flow rates of argon and helium are 50SLM and 40SLM, respectively.

[0067] During the aluminum alloy powder spraying process, the flow rate of the cold spray powder feeding gas is 200-300 SLM, the chamber pressure is 4 MPa, and the gun chamber temperature is 600℃.

[0068] The rotational speed of the rotary table is set to 100 r / min.

[0069] The thickness of the metal gradient coating on the quartz glass surface obtained in this embodiment is 0.6 mm, and the middle part gradually transitions from silicon dioxide to 6061 aluminum alloy. Figure 1 This is a photograph of the metal gradient coating on the surface of the quartz glass prepared in Example 1.

[0070] Figure 2 This is a scanning electron microscope image of the metal gradient coating on the surface of the quartz glass prepared in Example 1; Figure 2 The cross-sectional morphology of the composite coating was shown. Figure 3 and Figure 4 The distribution of aluminum and silicon elements in the coating is shown. It can be seen that the bottom area is dominated by silicon dioxide, and the amount of silicon dioxide gradually decreases towards the top of the coating, while the amount of aluminum gradually increases.

[0071] Example 2

[0072] The composite spraying method for the metal gradient coating on the quartz glass surface in this embodiment is carried out according to the following steps:

[0073] Step 1: First, roughen the surface of the quartz glass by sandblasting, then clean it with ultrasonic cleaning and air drying, and finally fix it on the rotating table.

[0074] The sandblasting roughening treatment uses 18μm alumina particles, and after the sandblasting roughening treatment, compressed air is used to blow away the impurities remaining on the surface of the quartz glass.

[0075] The ultrasonic cleaning uses anhydrous ethanol as the cleaning agent, and the ultrasonic cleaning time is 10 minutes.

[0076] The quartz glass is columnar;

[0077] The rotating platform is parallel to the ground, and the quartz glass is vertically fixed on the rotating platform.

[0078] Step 2: Fill the powder feeders of the cold spraying equipment and the plasma spraying equipment with aluminum alloy powder and silica powder respectively; adjust the angle between the cold spraying gun and the quartz glass surface to 90°, and the angle between the plasma spraying gun and the quartz glass surface to 90°. Set a heat insulation baffle between the two spray guns. The distance between the nozzle of the cold spraying gun and the quartz glass surface should be 4cm. The distance between the nozzle of the plasma spraying gun and the quartz glass surface should also be 4cm.

[0079] The aluminum alloy powder has a purity of 99.9% and a particle size of 33 μm;

[0080] The silica powder has a purity of 99.9% and a particle size of 35 μm.

[0081] The aluminum alloy powder is 6061 aluminum alloy;

[0082] Step 3: Cold spraying uses nitrogen as the powder feeding gas; plasma spraying uses argon as the main gas and powder feeding gas, and helium as the secondary gas and plasma gas.

[0083] The purity of the nitrogen, argon, and helium is 99.9%.

[0084] Step Four

[0085] First, turn on the rotary table to synchronize the rotation of the quartz glass with the rotary table; then turn on the plasma spraying equipment and begin spraying silica powder. After 5 seconds, turn on the cold spraying equipment to begin spraying aluminum alloy powder; the silica powder feed rate is 53.9 cm at the start of silica powder spraying. 3 / min; The initial powder feed rate for aluminum alloy powder is 4.4cm. 3 / min; During the spraying process, gradually reduce the feed rate of silica powder to 0m. 3 / min, the rate of decrease in silica powder feed rate is 65.3cm. 3 / min 2 Simultaneously, the feed rate of aluminum alloy powder was gradually increased, with an increase rate of 32.6 cm. 3 / min 2 When the feed rate of silica powder is reduced to 0m 3 When the plasma spraying equipment is turned off at a certain speed, the aluminum alloy is sprayed to the target thickness.

[0086] During the process of spraying silica powder, the voltage of the plasma spraying equipment is 32V, the current is 700A, and the flow rates of argon and helium are 50SLM and 40SLM, respectively.

[0087] During the aluminum alloy powder spraying process, the flow rate of the cold spray powder feeding gas is 200-300 SLM, the chamber pressure is 4 MPa, and the gun chamber temperature is 600℃.

[0088] The rotational speed of the rotary table is set to 120 r / min.

[0089] In this embodiment, the thickness of the metal gradient coating on the quartz glass surface is 0.5 mm, and the middle part gradually transitions from silicon dioxide to 6061 aluminum alloy.

Claims

1. A composite spraying method for a metal gradient coating on a quartz glass surface, characterized in that: The composite spraying method for metal gradient coating on quartz glass surface is carried out according to the following steps: Step 1: First, roughen the surface of the quartz glass by sandblasting, then clean it with ultrasonic cleaning and air drying, and finally fix it on the rotating table. The rotating platform is parallel to the ground, and the quartz glass is vertically fixed on the rotating platform. The sandblasting roughening treatment uses 18μm alumina particles, and after the sandblasting roughening treatment, compressed air is used to blow away the impurities remaining on the surface of the quartz glass. Step 2: Fill the powder feeders of the cold spraying equipment and the plasma spraying equipment with aluminum alloy powder and silica powder respectively; adjust the angle between the cold spraying gun and the quartz glass surface to 70-90°, and the angle between the plasma spraying gun and the quartz glass surface to 70-90°. Set up a heat insulation baffle between the two spray guns. The distance between the nozzle of the cold spraying gun and the quartz glass surface should be 4-7cm; the distance between the nozzle of the plasma spraying gun and the quartz glass surface should also be 4-7cm. The particle size of the aluminum alloy powder is 30-50 μm; The particle size of the silica powder is 30-50 μm; The aluminum alloy powder is 6061 aluminum alloy; Step 3: Cold spraying uses nitrogen as the powder feeding gas; plasma spraying uses argon as the main gas and powder feeding gas, and helium as the secondary gas and plasma gas. Step Four First, turn on the rotating platform to make the quartz glass rotate synchronously with the rotating platform; Then turn on the plasma spraying equipment and start spraying silica powder. After 3-5 seconds, turn on the cold spraying equipment and start spraying aluminum alloy powder. When starting to spray silica powder, the powder feed rate is 49.1-58.8 cm. 3 / min; When starting to spray aluminum alloy powder, the powder feed rate is 3.9-5.9 cm. 3 / min; During the spraying process, gradually reduce the feed rate of silica powder to 0m. 3 The feed rate of silica powder decreased by 49.1-73.5 cm / min. 3 / min 2 Simultaneously, the feed rate of aluminum alloy powder is gradually increased, with an increase rate of 24.5-36.8 cm. 3 / min 2 When the feed rate of silica powder is reduced to 0m 3 When the plasma spraying equipment is turned off at a certain speed, the aluminum alloy is sprayed to the target thickness. During the process of spraying silica powder, the voltage of the plasma spraying equipment is 32-35 V, the current is 700-800 A, and the flow rates of argon and helium are 5-65 SLM and 30-40 SLM, respectively. During the aluminum alloy powder spraying process, the flow rate of the cold spray powder feeding gas is 200-300 SLM, the chamber pressure is 3.5-5.5 MPa, and the gun chamber temperature is 550-600℃. The rotational speed of the rotary table is set within the range of 50-150 r / min.

2. The composite spraying method for a metal gradient coating on a quartz glass surface according to claim 1, characterized in that: The ultrasonic cleaning described in step one uses anhydrous ethanol as the cleaning agent, and the ultrasonic cleaning time is 10 minutes.

3. The composite spraying method for a metal gradient coating on a quartz glass surface according to claim 1, characterized in that: The quartz glass mentioned in step one is frosted quartz glass or transparent quartz glass.

4. The composite spraying method for a metal gradient coating on a quartz glass surface according to claim 1, characterized in that: The purity of the aluminum alloy powder mentioned in step two is 99.9%.

5. The composite spraying method for a metal gradient coating on a quartz glass surface according to claim 1, characterized in that: The purity of the silica powder mentioned in step two is 99.9%.

6. The composite spraying method for a metal gradient coating on a quartz glass surface according to claim 1, characterized in that: In step four, during the aluminum alloy powder spraying process, the flow rate of the cold spray powder feeding gas is 200-300 SLM, the chamber pressure is 4 MPa, and the gun chamber temperature is 600℃.

7. The composite spraying method for a metal gradient coating on a quartz glass surface according to claim 1, characterized in that: The purity of nitrogen, argon, and helium mentioned in step three is 99.9%.

8. The composite spraying method for a metal gradient coating on a quartz glass surface according to claim 1, characterized in that: Step 4: First, turn on the rotating platform to make the quartz glass rotate synchronously with the rotating platform; Then turn on the plasma spraying equipment and start spraying silica powder. After 5 seconds, turn on the cold spraying equipment and start spraying aluminum alloy powder. The initial feed rate of silica powder was 49.1 cm³. 3 / min; The initial powder feed rate for aluminum alloy powder spraying is 4.9cm. 3 / min; During the spraying process, gradually reduce the feed rate of silica powder to 0m. 3 / min, the rate of decrease in silica powder feed rate is 58.8cm. 3 / min 2 Simultaneously, the feed rate of aluminum alloy powder was gradually increased, with an increase rate of 29.4 cm. 3 / min 2 When the feed rate of silica powder is reduced to 0m 3 When the plasma spraying equipment is turned off at a certain speed, the aluminum alloy is sprayed to the target thickness.

9. The composite spraying method for a metal gradient coating on a quartz glass surface according to claim 1, characterized in that: Step 4: First, turn on the rotating platform to make the quartz glass rotate synchronously with the rotating platform; Then turn on the plasma spraying equipment and start spraying silica powder. After 5 seconds, turn on the cold spraying equipment and start spraying aluminum alloy powder. The initial feed rate of silica powder was 53.9 cm³. 3 / min; The initial powder feed rate for aluminum alloy powder is 4.4cm. 3 / min; During the spraying process, gradually reduce the feed rate of silica powder to 0m. 3 / min, the rate of decrease in silica powder feed rate is 65.3cm. 3 / min 2 Simultaneously, the feed rate of aluminum alloy powder was gradually increased, with an increase rate of 32.6 cm. 3 / min 2 When the feed rate of silica powder is reduced to 0m 3 When the plasma spraying equipment is turned off at a certain speed, the aluminum alloy is sprayed to the target thickness.

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