Ultrafast laser welding method applied to ceramics

An ultra-fast laser and welding method technology, applied in the field of ceramic material connection, can solve the problems that restrict the wide application of ceramic materials, the application is difficult to meet the requirements, and the thermal shock effect is large, so that the welding seam can be repeated, easy to automate, and thermal shock small effect

Pending Publication Date: 2020-08-25
NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, since brazing and diffusion welding are difficult to meet the requirements under high temperature conditions, lasers have been explored at home and abroad to weld ceramics in recent years. Cracks seriously restrict the further wide application of ceramic materials

Method used

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  • Ultrafast laser welding method applied to ceramics
  • Ultrafast laser welding method applied to ceramics

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Experimental program
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Effect test

Embodiment 1

[0031] Turn on the ultrafast laser to weld the ceramic material, and the selected ceramic material is alumina ceramic. Use acetone, absolute ethanol, and deionized water in sequence to ultrasonically clean the surface of the alumina ceramic to be welded to remove surface impurities and oil, and dry it with a hair dryer. figure 1 On the movable working platform 7, by adjusting the pad iron 6, the pressure plate 5 is controlled to be parallel to the platform, and the bolt 4 is used to compress to realize the fixing of the ceramic 3 and the ceramic 8. Adjust laser parameters: laser power 36W, pulse width 300fs, repetition frequency 1MHz, adjust lens 3 so that the spot diameter is 0.1mm, scan speed 10mm / s, repeat 2 times for welding. figure 2 It is the effect picture of welding, and it can be seen that a vertical weld seam is formed.

[0032] Adopting the ultra-fast welding method of ceramics in the present invention can be applied to structural ceramics such as alumina ceramics...

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Abstract

The invention relates to the technical field of ceramic connection, in particular to an ultrafast laser welding method applied to ceramics. According to the method, the joint of the ceramic workpieceis irradiated through ultrafast laser, the ceramic absorbs photon energy, a nonlinear absorption phenomenon is induced under high power density, the ceramic at the focus is fused instantaneously, theatomic activity is greatly improved, and then elements at the joint of the ceramic workpiece are diffused to form welding spots. Due to the fact that the ultrafast laser action time is extremely short, heat cannot be dissipated in time, and a heat-affected zone is extremely small. Reliable connection of ceramic can be achieved by changing relevant parameters of ultrafast laser, and the phenomenonof weld joint cracking caused by thermal stress can be greatly reduced. By the adoption of the method, the welding stress of the weld joint can be reduced, cracks at the weld joint are avoided, and fusion welding of the ceramic is achieved under the condition that ablation does not occur.

Description

technical field [0001] The invention relates to the technical field of connection of ceramic materials, in particular to an ultrafast laser welding method for ceramics. Background technique [0002] Compared with metal materials and polymer materials, ceramic materials have excellent characteristics such as high melting point, high hardness, high temperature resistance, corrosion resistance and wear resistance. Extensive and irreplaceable applications, the application of ceramics has also maintained a growth rate of about 10% year by year in the past two decades. However, due to the characteristics of high hardness, high melting point, and high brittleness of ceramic materials, the welding performance of ceramic materials is very poor, and its processing performance is not high, which cannot meet the needs of manufacturing complex parts. At present, the commonly used connection methods for ceramic materials include brazing, diffusion welding, mechanical connection, laser we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00
CPCC04B37/001C04B2237/52
Inventor 李晓鹏支新涛冯靖彭勇王克鸿周琦王大森袁松梅
Owner NANJING UNIV OF SCI & TECH
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