Composite Strengthening Method for Laser Induced Synthesis of Nanodiamonds
A nano-diamond and laser-induced technology, applied in the field of material surface modification, can solve problems such as high cost and low output, and achieve the effect of improving strength, increasing output, improving hardness and tribological properties
Active Publication Date: 2022-08-05
WUHAN UNIV
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Problems solved by technology
To sum up, at this stage, the synthesis of diamond from graphite often requires extreme operating environments, such as high temperatures greater than 2000K and high pressures greater than 10GPa. It is precisely because of these extreme operating environments that the above diamond preparation methods often correspond to high costs and low costs. Yield
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Embodiment 1
[0028] like figure 1 As shown, it is a schematic diagram of a method for preparing a carbon layer based on a laser. On the surface of 0.2mm pure copper plate 1, a layer of polyimide 2 was evenly coated by glass rod roll coating method, placed on heating platform 3, and cured at a temperature of 110° C. for 7 minutes. A carbon dioxide laser 4 with an output power of 11% is selected, and the laser beam is continuously irradiated on the surface of the cured polyimide to generate graphene 5 . like figure 2 Shown is a schematic diagram of a method for composite strengthening based on laser-induced synthesis of nanodiamonds. The member to be strengthened whose surface generates graphene 5 is placed in the sealing chamber 6, and the BK-7 glass constraining layer 7 is placed above the graphene 5, the vacuum pump 8 is turned on, and the sealing chamber 6 is subjected to vacuum treatment. When the sealed chamber 6 is in a negative pressure state, it is placed on the three-dimensiona...
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The invention discloses a composite strengthening method for laser-induced synthesis of nano-diamonds. The steps are as follows: (1) uniformly coat a carbon source on the surface of a component, emit a laser beam by means of a carbon dioxide laser and continuously irradiate the surface of the carbon source, and convert it into Graphene or activated carbon layer; (2) Laying a constraining layer on top of the carbon layer; (3) Using a femtosecond laser to emit a pulsed laser beam, and a heating laser to emit a continuous laser beam, to ensure that the centers of the two laser spots overlap and irradiate on the carbon (4) The three-dimensional numerical control mobile platform or the laser is moved to the next strengthening position to carry out the laser shock composite strengthening operation. The invention can induce the formation of nano-diamond particles on the outer surface of the vulnerable component, form a compressive stress layer, realize the direct strengthening of high-hardness diamond, and at the same time refine the crystal grains on the surface of the component, and generate a grain structure with a gradient distribution along the thickness direction. Effectively improve the strength of the material without sacrificing the ductility of the material.
Description
technical field [0001] The invention relates to the technical field of material surface modification, in particular to a composite strengthening method for laser-induced synthesis of nano-diamonds. Background technique [0002] Nanodiamond is a multifunctional material. Because of its excellent thermodynamic properties, it is widely used in biosensors, quantum computing, fuel cells and computer chips. In addition, nanodiamond, as a dispersion reinforcing phase of composite materials, can significantly improve metal Comprehensive mechanical properties of the substrate. In engineering, nano-diamond can be directly or indirectly applied to the surface strengthening of vulnerable components to improve the strength and tribological properties of components. For example, Wang Xitao et al. The preparation method of composite material, by adding single crystal diamond particles and compounding with high thermal conductivity metal Al, can obtain electronic packaging materials with e...
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Login to View More IPC IPC(8): C22F3/00C01B32/26B82Y40/00
CPCC22F3/00C01B32/26B82Y40/00
Inventor 胡耀武张啸寒
Owner WUHAN UNIV