A method for determining laser sintering parameters of nano-copper powder 3D printing
A nano-copper powder and laser sintering technology, applied in the field of 3D printing, can solve the problems of difficulty in characterizing nano-copper powder, high price, high energy consumption, etc., and achieve the effect of improving research and development efficiency, reducing the amount of experiments, and reducing research and development costs.
Active Publication Date: 2020-08-28
GRIMAT ENG INST CO LTD
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Problems solved by technology
However, due to the difficulty in characterization of nano-copper powder, and the problems of high equipment requirements, high price, and high energy consumption in 3D printing experiments, it takes a lot of manpower and material resources to explore the laser sintering process of nano-copper powder
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0024] (1) The shape of the laser sintered copper powder is spherical, and the average particle size is 20 nanometers;
[0025] (2) According to the spatial distribution of copper atoms, a theoretical model of four copper powder particles was established by periodically stacking and arranging them. The shape of a single copper powder particle is spherical and the particle size is 20 nm. The theoretical melting point of the nano-copper powder object is 625°C by calculating and analyzing the radial distribution function by using the molecular dynamics material calculation research method. Considering that the model used in this embodiment is relatively simple, the melting point is not corrected;
[0026] (3) Using molecular dynamics material calculation simulation research method, simulate the sintering evolution process of nano-copper powder under the condition of 0.2 microseconds to 5 microseconds (interval step is 0.2 microseconds), the initial temperature is 25 ° C, and the ...
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Abstract
The invention belongs to the technical field of 3D printing, in particular to a method for determining laser sintering parameters of nanometer copper powder 3D printing. The method comprises the following steps: (1) determining the shape and particle size of the laser sintered copper powder; (2) modeling and calculating the theoretical melting point of the sintered nano-copper powder; (3) calculating and simulating the sintering of the nano-copper powder under different length conditions In the evolution process, the theoretical model of the printed sintered body is obtained, and then its porosity / density is obtained; (4) tensile simulation is performed to calculate the mechanical properties of the sintered body; (5) the target performance is used as a criterion to deduce the best Sintering rate range; (6) Calculate the theoretical sintering power according to the sintering temperature, sintering rate, the amount of sintered material and the heat capacity of copper. The method is reliable, reduces the amount of experiments, significantly reduces the research and development cost of the copper powder 3D printing process, and improves the research and development efficiency.
Description
technical field [0001] The invention belongs to the technical field of 3D printing, in particular to a method for determining laser sintering parameters of nanometer copper powder 3D printing. Background technique [0002] 3D printing belongs to the additive manufacturing method, that is, the required products are produced by superimposing materials layer by layer through three-dimensional printing. 3D printing does not require the use of molds and has natural advantages in the manufacture of personalized, non-mass products. Among them, 3D printed copper products can be widely used in the fields of electronics, electricity, energy, chemicals, automobiles, machinery and high-energy physics. Selective laser melting (SLM) technology uses laser as the heat source and is the mainstream sintering process for metal 3D molding. [0003] Metal copper is a reflective material, which reduces the energy utilization rate of the laser during the laser sintering process. The high therma...
Claims
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IPC IPC(8): B22F3/105B33Y50/00
CPCB33Y50/00B22F10/00B22F10/28B22F10/36B22F10/80Y02P10/25
Inventor 王建伟肖伟施静敏孙璐崔建东
Owner GRIMAT ENG INST CO LTD