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Metal die for coining super-hydrophobic micro-nanometer surface and laser manufacturing method thereof

A micro-nano surface and metal mold technology, applied in laser welding equipment, metal processing equipment, nanotechnology, etc., to achieve the effects of wide practicability, high efficiency, great flexibility and designability

Active Publication Date: 2014-01-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The primary problem at present is how to prepare superhydrophobic surfaces in a large area, efficiently and at low cost, so that the excellent properties of superhydrophobic self-cleaning surfaces can be widely used.

Method used

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  • Metal die for coining super-hydrophobic micro-nanometer surface and laser manufacturing method thereof
  • Metal die for coining super-hydrophobic micro-nanometer surface and laser manufacturing method thereof
  • Metal die for coining super-hydrophobic micro-nanometer surface and laser manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1. Preparation of high-power picosecond laser die steel mold with imprinting superhydrophobic micro / nano surface

[0041] In this embodiment, a high-power picosecond laser is used to prepare H13 hot work die steel molds with superhydrophobic micro / nano surfaces, including the following steps:

[0042] 1) Preparation of the metal substrate: firstly, the surface of the H13 hot mold steel substrate is polished by mechanical processing, and then polished with a grinding and polishing machine, ultrasonically cleaned with alcohol, and dried for later use;

[0043] 2) Laser processing: using high-power picosecond laser, near-infrared with a laser wavelength of 1.06 microns, laser beam with Gaussian distribution, pulse width of 15 picoseconds, repetition frequency of 4M, average power of 100W, and ablation threshold exceeding The laser energy density is 3.0J / cm 2 , With the XY scanning galvanometer, ablate the surface of the H13 hot-worked die steel to form a symmetrical negat...

Embodiment 2

[0045] Example 2. Preparation of high-speed steel mold with superhydrophobic micro / nano surface imprinted by high-power picosecond laser

[0046] In this embodiment, using a high-power picosecond laser to prepare a mold steel mold for imprinting super-hydrophobic micro / nano surfaces includes the following steps:

[0047] 1) Preparation of the metal substrate: first, the surface of the high-speed steel substrate is polished by mechanical processing, and then polished with a grinding and polishing machine, ultrasonically cleaned with alcohol, and dried for later use;

[0048] 2) Laser processing: using high-power picosecond laser, green light with laser wavelength of 532nm, laser beam with Gaussian distribution, pulse width of 3 picoseconds, repetition frequency of 100K, average power of 40W, and ablation threshold Laser energy density 1.2J / cm 2 , With the 3D scanning galvanometer, ablate the surface of the high-speed steel to form a symmetrical negative structure of the lotus leaf mic...

Embodiment 3

[0050] Example 3: Preparation of cemented carbide mold with superhydrophobic micro / nano surface imprinted by high-power femtosecond laser

[0051] In this embodiment, using a high-power femtosecond laser to prepare a cemented carbide mold for imprinting superhydrophobic micro / nano surfaces includes the following steps:

[0052] 1) Preparation of the metal base material: first, the surface of the cemented carbide base material is polished by mechanical processing, and then polished with a grinding and polishing machine, ultrasonically cleaned with alcohol, and dried for later use;

[0053] 2) Laser processing: high-power femtosecond laser, near-infrared laser with a wavelength of 1.06 microns, Gaussian distribution of laser beam, pulse width of 100 femtoseconds, repetition frequency of 1K, average power of 4W, and ablation threshold exceeding The laser energy density is 1.5J / cm 2 , Cooperate with the XY platform to move the laser beam to scan the cemented carbide substrate for ablatio...

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Abstract

The invention discloses a metal die for coining a super-hydrophobic micro-nanometer surface and a laser manufacturing method thereof. The laser manufacturing method comprises the following steps that an ultra-short pulse laser is used for ablating a metal base material, a symmetrical negative structure of a lotus leaf micro-nanometer structure is obtained on the surface of the metal base material through laser ablating removing, and then the metal die is obtained; the symmetrical negative structure of the lotus leaf micro-nanometer structure is a micrometer-level pit and a nanometer-level substructure on the inner surface of the micrometer-level pit. The invention provides the micro-nanometer coining metal die for coining a non-metal material or a light-metal material so as to form the lotus leaf micro-nanometer structure with the surface being super hydrophobic and the laser manufacturing method of the metal die, and particularly relates to the micro-nanometer coining metal die which is manufactured efficiently in a large area by the utilization of high-power picosecond lasers and the manufacturing method of the metal die. The metal die for coining the super-hydrophobic micro-nanometer surface and the laser manufacturing method of the metal die have the comprehensive advantages that the manufacturing efficiency is high, the micro-nanometer coining die is high in temperature resistance, high in pressure resistance and wide in coning material range, the micro-nanometer structure is precise and adjustable in parameter and the lotus structure is vivid. Moreover, the manufacturing method is far superior than other methods.

Description

Technical field [0001] The invention relates to a metal mold for imprinting superhydrophobic micro / nano surfaces and a preparation method thereof, in particular to a metal mold for imprinting superhydrophobic micro / nano surfaces and a laser preparation method thereof. Background technique [0002] The lotus leaf has the self-cleaning function of “sludge without staining”. This function comes from the superhydrophobicity produced by the low free energy components on the surface of the lotus leaf and the unique micro-nano structure, that is, the contact angle between the surface and water exceeds 150°. In the 1970s, Professor Barthlott, a botanist at Bonn University in Germany, discovered that there are multiple micro- and nano-structures on the surface of lotus leaves, consisting of micro-nano bumps with an average size of about 10 μm and nano-level wax filaments with a diameter of 100-200 nm. This structure transforms the surface contact between the water and the interface into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/362B82Y40/00
CPCB23K26/361B82Y40/00
Inventor 钟敏霖林澄张红军范培迅龙江游
Owner TSINGHUA UNIV
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