8results about How to "Improve laser absorption rate" patented technology

The invention discloses a ceramic / high-entropy alloy composite particle reinforced aluminum-based composite material and a laser additive manufacturing method thereof. Firstly, ceramic / high-entropy alloy composite powder and aluminum alloy powder are mixed through ball milling to obtain ceramic / high-entropy alloy composite particle reinforced aluminum alloy composite powder, then the composite powder of the three components is laid on a powder bed, laser power, scanning speed, scanning spacing and the like are adjusted, and laser scanning melting solidification is conducted to prepare the ceramic / high-entropy alloy composite particle reinforced aluminum alloy composite powder. And the ceramic / high-entropy alloy composite particle reinforced aluminum-based composite material is formed. The composite material disclosed by the invention is highly compact, so that the ceramic / high-entropy alloy composite particles can effectively improve the mechanical property of the aluminum-based composite material, and can be used for manufacturing high-performance complex parts for aerospace, automobile rail transit and the like.

The application provides a 3D printing method for preparing a low-cost TA15 part based on a bimodal particle size distribution near-spherical powder and a high-performance low-cost TA15 part. The 3D printing method uses a bimodal particle size distribution near-spherical TA15 alloy powder with good uniformity as a raw material, improves the near-spherical powder bed density through bimodal grading of coarse powder and fine powder, and then prepares a low-cost high-performance TA15 part through an optimized selective laser melting (SLM) process parameter window suitable for bimodal distribution powder, thereby providing a more cost-effective preparation method for TA15 titanium alloy parts in aerospace.

The present invention specifically relates to a nano boron carbide / copper composite material and a preparation method thereof. The preparation method mainly comprises the following steps: (1) uniformly mixing high-purity copper powder and micron boron carbide powder; (2) performing additive manufacturing on the mixed powder using selective laser melting technology to form a nano boron carbide / copper composite material; (3) performing hot isostatic pressing densification treatment on the nano boron carbide / copper composite material. The present invention utilizes laser to excite micron boron carbide to melt, and the melted droplets are further refined and reduced by the Marangoni convection of the copper molten pool, and finally realize the uniform dispersion of nano-level boron carbide particles in the copper matrix. The obtained nano boron carbide / copper composite material has good composite effect, high strength and toughness, high conductivity and high thermal stability, and has broad application prospects.

This invention discloses a method for refining primary silicon in Al-Si alloys through synergistic modification with nano-ceramics based on laser additive manufacturing. The method involves uniformly mixing Al-Si alloy powder with TiB2 and Al2O3 nano-ceramics using a ball mill under inert gas protection to obtain a ceramic-reinforced nano-Al-Si alloy composite powder. This nano-ceramic-modified Al-Si alloy powder is then melted and solidified layer by layer using a laser powder bed melting and forming equipment to create the desired target part. In this method, during the solidification of the nano-ceramic-reinforced Al-Si alloy melt, Al2O3 nanoparticles, due to their similarity to the Si crystal structure and the existence of a good interfacial coherence relationship, act as heterogeneous nucleation sites for primary silicon, increasing the nucleation rate and refining the size of primary silicon. TiB2 nanoparticles, distributed at the solid-liquid interface, can to a certain extent prevent the diffusion and aggregation of Si atoms into Si-Si atom clusters, thereby inhibiting the growth of the primary silicon phase, promoting the regularization of the primary silicon morphology and refining its size, and effectively reducing matrix grain size, significantly improving the mechanical properties of the Al-Si alloy.

This invention discloses a method for fabricating a perovskite solar cell optoelectronic module. After depositing the oxide layer and before P2 laser scribing, a pre-coating step is added: a heat-absorbing layer is pre-coated onto the oxide layer and cured. The heat-absorbing layer has a conduction band level greater than -5.43 eV and a conductivity greater than 10. ‑6 The material has an Ω / m density, and the heat-absorbing layer covers the P2 laser scribing area; the P2 laser scribing is performed using a laser in the 355-2000nm wavelength band. This invention can improve the long-term operational stability of the equipment and reduce equipment costs, thereby meeting the needs of large-format, high-efficiency production and enabling the mass production of this type of perovskite solar cell.

This invention discloses a device and method for water-guided laser-assisted laser-directed energy deposition. The device includes: a water-guided laser processing system, a laser-directed energy deposition system, a worktable, and a control system. The water-guided laser processing system generates a laser jet beam to process microstructures on the deposition area of ​​a substrate or a workpiece with a highly reflective metallic material. The laser-directed energy deposition system deposits the highly reflective metallic material in the deposition area and manufactures the workpiece using a layer-by-layer deposition method. During the workpiece forming process, the worktable moves the workpiece up and down by driving the substrate. The control system is connected to the laser-directed energy deposition system, the water-guided laser processing system, and the worktable, alternately controlling the connected components. By generating microstructures on the workpiece surface using a water-guided laser, and utilizing the multiple reflections and absorptions of the laser within the microstructures, the laser absorptivity, surface roughness, and wettability are significantly improved, while the thermal conductivity of the material surface is reduced.

According to the TiB2 / Al-Cu alloy and the preparation method and application thereof provided by the invention, the TiB2 / Al-Cu alloy is prepared by adopting a mixed salt in-situ synthesis method in which mechanical stirring is assisted by magnetic field vibration, so that uniform dispersion of micro-nano TiB2 particles formed in a material is facilitated, a particle heterogeneous nucleation effect and a particle heterogeneous nucleation effect are exerted, and the material utilization rate is improved. The laser absorptivity of the alloy in the additive manufacturing process can be effectively improved; the TiB2 / Al-Cu alloy comprises the following basic components in percentage by mass: 1 to 5 percent of Cu; mn: 0.1 to 0.3%; 1-8% of TiB2, and the balance of Al. Preferably, Mn, Zr / Y and other trace alloying elements are added in the smelting process, grains can be refined in the alloying process, and the mechanical property and corrosion resistance of the material are improved.

A laser processing machine (100) is provided with: a collimator lens (31) that converts a laser beam into collimated light; a condenser lens (36) that condenses the collimated light on a metal plate; a first lens array (32) that arranges a plurality of first microlenses in a planar manner and refracts the laser beam using each first microlens; a second lens array (33) that arranges a plurality of second microlenses in a planar manner with the center disposed at the same position as the center of the first lens array in the optical axis direction and causes the laser beam emitted from each microlens of the first lens array to enter and be refracted using each corresponding second microlens; and a rotation mechanism (331) that rotates at least either the first lens array or the second lens array along the outer periphery thereof.