Surface coating method for diamond laser welding

Abstract

The invention discloses a surface coating method for diamond laser welding. The surface coating method comprises the following steps: preparing a basic coating; preparing a light-absorbing nanoparticle layer; preparing a temperature regulation and control layer; preparing an anti-oxidation layer; and the basic coating, the light absorption nanoparticle layer, the temperature regulation and control layer and the anti-oxidation layer are sequentially welded. The laser welding device has the beneficial effects that the laser absorption capacity is improved, the welding efficiency is improved, and the laser energy loss is effectively reduced; the surface temperature of the diamond can be accurately controlled, lattice fracture caused by overheating is avoided, and the welding stability is improved; oxidation of the diamond surface is effectively prevented in a high-temperature welding environment, the welding reliability is improved, and the service life of the coating is prolonged; stable absorptivity can be kept under different laser powers, and cracks and defects generated in the welding process are reduced; the thickness and structure of each layer can be accurately controlled, the method is suitable for large-scale industrial production, and the feasibility and economy of the preparation process are improved.

Description

Technical Field

[0001] The invention relates to a diamond precision machining method, in particular to a diamond laser welding surface coating method. Background Art

[0002] Diamond has unique advantages in industrial applications such as laser welding due to its excellent hardness and thermal conductivity. However, traditional diamond laser welding faces a challenge: the surface has limited absorption capacity for laser light, resulting in low welding efficiency, and it is difficult to achieve precise control of welding temperature.

[0003] Current surface coating technologies mainly use single-layer or traditional multi-layer designs, but these solutions are difficult to find an ideal balance between light absorption, temperature control and coating stability. Traditional coatings often cause the surface temperature of diamond to be too high under high-power lasers, which in turn causes lattice cracks and other thermal damage, limiting the widespread application of diamond in laser welding.

[0004] Therefore, there is an urgent need to develop a new coating technology that can improve the absorption efficiency of diamond to lasers by cleverly designing a multilayer structure and accurately control the surface temperature of diamond during laser welding. This innovation is expected to improve the efficiency and stability of diamond laser welding, while reducing the risk of lattice fracture and thermal damage, and promote the widespread use of diamond in high-performance laser applications. The research and development of new coating technology will bring revolutionary breakthroughs to diamond laser welding and provide more reliable welding solutions for industrial manufacturing, electronic equipment manufacturing and other high-precision fields. At the same time, this technology is also expected to reduce energy consumption, improve production efficiency, and make positive contributions to the development of sustainable manufacturing and advanced industrial technologies. Summary of the invention

[0005] The technical problem to be solved by the present invention is to propose a surface coating method for diamond laser welding in view of the deficiencies in the above-mentioned prior art.

[0006] To solve the above problems, the present invention provides a surface coating method for diamond laser welding, comprising:

[0007] preparing a base coating;

[0008] preparing a light absorbing nanoparticle layer;

[0009] preparing a temperature regulating layer;

[0010] preparing an anti-oxidation layer;

[0011] The base coating, light-absorbing nanoparticle layer, temperature control layer and anti-oxidation layer are welded in sequence.

[0012] The step of preparing the base layer comprises:

[0013] The base layer is formed by silicon nitride;

[0014] Set the thickness of the base layer to be in the range of 20 to 100 nm.

[0015] The method for preparing the light-absorbing nanoparticle layer comprises:

[0016] A light-absorbing nanoparticle layer is formed by platinum nanoparticles or tungsten nanoparticles;

[0017] The average diameter of the platinum nanoparticles or tungsten nanoparticles is set between 5 and 50 nm.

[0018] The method of preparing the temperature regulating layer comprises:

[0019] A temperature control layer is formed by niobium nitride;

[0020] The thickness of the temperature control layer is set within the range of 50 to 500 nm.

[0021] The method for preparing the anti-oxidation layer comprises:

[0022] An anti-oxidation layer is formed by aluminum nitride;

[0023] The average grain size of aluminum nitride is set between 1 and 10 nm.

[0024] Also includes:

[0025] The mass of the light absorbing nanoparticle layer is set to 5% to 30% of the mass of the base coating.

[0026] The step of preparing the base layer further includes:

[0027] The base layer, light-absorbing nanoparticle layer, temperature control layer and anti-oxidation layer are prepared by physical vapor deposition method.

[0028] Also includes:

[0029] The surface roughness of the base coating, the light-absorbing nanoparticle layer, the temperature regulating layer and the anti-oxidation layer are respectively set between 0.5 and 10 nm.

[0030] The sequential welding of the base coating, the light-absorbing nanoparticle layer, the temperature control layer and the anti-oxidation layer comprises:

[0031] The welding is performed at a temperature ranging from 300°C to 800°C;

[0032] Set the laser power density to 106~108W / m 2 Under the laser conditions, the surface temperature of the diamond can be maintained between 1200℃ and 1800℃.

[0033] Also includes:

[0034] The base coating, the light-absorbing nanoparticle layer, the temperature regulating layer and the anti-oxidation layer are prepared by using an inert gas, wherein the inert gas is nitrogen or argon.

[0035] The beneficial effects of the present invention are:

[0036] By applying a nano multilayer structure on the diamond surface, the laser absorption capacity is improved, the welding efficiency is increased, and the laser energy loss is effectively reduced.

[0037] The use of temperature control layer niobium nitride (NbN) can accurately control the surface temperature of the diamond, avoid lattice cracking caused by overheating, and improve welding stability.

[0038] The anti-oxidation layer of aluminum nitride (AlN) is used to effectively prevent oxidation of the diamond surface in high-temperature welding environments, thereby improving welding reliability and coating life.

[0039] By rationally designing the light-absorbing nanoparticle layer (platinum or tungsten), a stable absorption rate can be maintained at different laser powers, reducing cracks and defects generated during the welding process.

[0040] The physical vapor deposition (PVD) method can accurately control the thickness and structure of each layer, making it suitable for large-scale industrial production and improving the feasibility and economy of the preparation process. DETAILED DESCRIPTION

[0041] In order to clearly explain the purpose, technical solutions and advantages of the embodiments of the present invention, the technical solutions of the embodiments of the present invention are explained in detail and completely. Obviously, the embodiments described here are only some examples of the present invention, not all. Based on the embodiments disclosed in the present invention, all other embodiments that can be obtained by those skilled in the art without creative work should be regarded as the scope covered by the present invention.

[0042] A surface coating method for diamond laser welding provided by the present invention comprises steps S1-S5:

[0043] S1, preparing a base coating; Step S1 includes steps S11-S12:

[0044] S11, forming a base layer by silicon nitride;

[0045] S12. Set the thickness of the base layer to be within the range of 20 to 100 nm.

[0046] In this embodiment, the base coating is made of silicon nitride (Si3N4) and has a thickness in the range of 20 to 100 nm.

[0047] S2, preparing a light-absorbing nanoparticle layer; Step S2 includes steps S21-S22:

[0048] S21, forming a light-absorbing nanoparticle layer by using platinum nanoparticles or tungsten nanoparticles;

[0049] S22. Setting the average diameter of the platinum nanoparticles or tungsten nanoparticles to be between 5 and 50 nm.

[0050] In this embodiment, the light-absorbing nanoparticle layer is composed of platinum (Pt) or tungsten (W) nanoparticles, and the average diameter thereof is between 5 and 50 nm.

[0051] S3, preparing a temperature control layer; Step S3 includes steps S31-S32:

[0052] S31, forming a temperature control layer by using niobium nitride;

[0053] S32. Setting the thickness of the temperature control layer within the range of 50 to 500 nm.

[0054] In this embodiment, the temperature control layer is made of niobium nitride (NbN), and its thickness can be adjusted within the range of 50 to 500 nm according to welding conditions.

[0055] S4, preparing an anti-oxidation layer; Step S4 includes steps S41-S42:

[0056] S41, forming an anti-oxidation layer by aluminum nitride;

[0057] S42. Set the average grain size of aluminum nitride to between 1 and 10 nm.

[0058] In this embodiment, the anti-oxidation layer is made of aluminum nitride (AlN), and the average grain size thereof is between 1 and 10 nm.

[0059] S5, sequentially welding the base coating, the light-absorbing nanoparticle layer, the temperature control layer and the anti-oxidation layer. Step S5 includes steps S51-S52:

[0060] S51, welding is performed at a temperature ranging from 300°C to 800°C;

[0061] S52, set the laser power density to 106~108W / m 2 Under the laser conditions, the surface temperature of the diamond can be maintained between 1200℃ and 1800℃.

[0062] In this embodiment, the temperature range used in the preparation process of the coating is 300° C. to 800° C. The coating can maintain the surface temperature of the diamond between 1200° C. and 1800° C. under the laser condition of a laser power density of 106 to 108 W / m2.

[0063] Preferably, the surface coating method for diamond laser welding further includes steps S6-S9:

[0064] S6. Set the mass of the light-absorbing nanoparticle layer to 5% to 30% of the mass of the base coating.

[0065] In this embodiment, the content of the light-absorbing nanoparticle layer is 5% to 30% of the total mass of the base coating.

[0066] S7. Prepare a base layer, a light-absorbing nanoparticle layer, a temperature control layer and an anti-oxidation layer by a physical vapor deposition method.

[0067] In this embodiment, the coating is prepared by a physical vapor deposition (PVD) method.

[0068] S8. Set the surface roughness of the base coating, the light-absorbing nanoparticle layer, the temperature control layer and the anti-oxidation layer to be between 0.5 and 10 nm respectively.

[0069] In this embodiment, the surface roughness of the base coating, the light-absorbing nanoparticle layer, the temperature regulating layer and the anti-oxidation layer is between 0.5 and 10 nm respectively.

[0070] S9. Use an inert gas to prepare a base coating, a light-absorbing nanoparticle layer, a temperature control layer and an anti-oxidation layer, wherein the inert gas is nitrogen or argon.

[0071] In this embodiment, the atmosphere used in the process of preparing the coating is an inert gas, nitrogen or argon.

[0072] The surface coating method of diamond laser welding provides the following specific embodiments:

[0073] Embodiment 1:

[0074] (1) Preparation of base coating: The surface of the diamond sample was cleaned, and silicon nitride (Si3N4) was deposited by physical vapor deposition (PVD) at 600°C in a nitrogen atmosphere to form a uniform base coating with a thickness of 80 nm.

[0075] (2) Preparation of light-absorbing nanoparticle layer: Platinum (Pt) nanoparticles with an average diameter of 20 nm and a mass accounting for 15% of the total mass of the base coating are deposited on the base coating by the same PVD method.

[0076] (3) Preparation of temperature control layer: Using PVD in a nitrogen atmosphere, niobium nitride (NbN) is deposited on the light-absorbing nanoparticle layer, and the thickness of the adjustment layer is 200 nm.

[0077] (4) Preparation of anti-oxidation layer: Aluminum nitride (AlN) is deposited on the temperature control layer by PVD with a grain size of 5 nm.

[0078] (5) Performance test: Under the condition of laser power density of 5×107W / m2, the diamond sample was irradiated with laser and the surface temperature was monitored by infrared thermometer. The results showed that at a temperature of 1500℃, the laser welding efficiency increased by 30%.

[0079] Embodiment 2:

[0080] (1) Preparation of base coating: A 50 nm thick silicon nitride (Si3N4) base coating was formed on the surface of the diamond sample to ensure surface smoothness and adhesion.

[0081] (2) Preparation of light-absorbing nanoparticle layer: Using the PVD method, tungsten (W) nanoparticles with an average diameter of 10 nm are deposited on the base coating, and the mass accounts for 10% of the total mass of the base coating.

[0082] (3) Preparation of temperature control layer: Using PVD, niobium nitride (NbN) with a thickness of 100 nm is deposited on the light-absorbing nanoparticle layer to achieve control of the diamond surface temperature.

[0083] (4) Preparation of anti-oxidation layer: Finally, aluminum nitride (AlN) is deposited on the temperature control layer by PVD with a grain size of 3 nm.

[0084] (5) Performance test: When the laser power density was 8×106W / m2, the diamond sample was welded using laser, and the surface temperature was monitored by an infrared thermometer. The results showed that at a temperature of 1300°C, the laser welding efficiency increased by 20%.

[0085] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A surface coating method for diamond laser welding, characterized in that: include: preparing a base coating; preparing a light absorbing nanoparticle layer; preparing a temperature regulating layer; preparing an anti-oxidation layer; The base coating, light-absorbing nanoparticle layer, temperature control layer and anti-oxidation layer are welded in sequence.

2. The surface coating method according to claim 1, characterized in that: The step of preparing the base layer comprises: The base layer is formed by silicon nitride; Set the thickness of the base layer to be in the range of 20 to 100 nm.

3. The surface coating method according to claim 1, characterized in that: The method for preparing the light-absorbing nanoparticle layer comprises: A light-absorbing nanoparticle layer is formed by platinum nanoparticles or tungsten nanoparticles; The average diameter of the platinum nanoparticles or tungsten nanoparticles is set between 5 and 50 nm.

4. The surface coating method according to claim 1, characterized in that: The method of preparing the temperature regulating layer comprises: A temperature control layer is formed by niobium nitride; The thickness of the temperature control layer is set within the range of 50 to 500 nm.

5. The surface coating method according to claim 1, characterized in that: The method for preparing the anti-oxidation layer comprises: An anti-oxidation layer is formed by aluminum nitride; The average grain size of aluminum nitride is set between 1 and 10 nm.

6. The surface coating method according to claim 1, characterized in that: Also includes: The mass of the light absorbing nanoparticle layer is set to 5% to 30% of the mass of the base coating.

7. The surface coating method according to claim 2, characterized in that: The step of preparing the base layer further includes: The base layer, light-absorbing nanoparticle layer, temperature control layer and anti-oxidation layer are prepared by physical vapor deposition method.

8. The surface coating method according to any one of claims 1 to 7, characterized in that: Also includes: The surface roughness of the base coating, the light-absorbing nanoparticle layer, the temperature regulating layer and the anti-oxidation layer are respectively set between 0.5 and 10 nm.

9. The surface coating method according to claim 8, characterized in that: The sequential welding of the base coating, the light-absorbing nanoparticle layer, the temperature control layer and the anti-oxidation layer comprises: The welding is performed at a temperature ranging from 300°C to 800°C; Set the laser power density to 106~108W / m 2 Under the laser conditions, the surface temperature of the diamond can be maintained between 1200℃ and 1800℃.

10. The surface coating method according to claim 9, characterized in that: Also includes: The base coating, the light-absorbing nanoparticle layer, the temperature regulating layer and the anti-oxidation layer are prepared by using an inert gas, wherein the inert gas is nitrogen or argon.