The hottest laser welded glass has made new progre

2022-09-23
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New progress has been made in the research of laser welding glass, with broad application prospects

nowadays, fusion welding is regarded as one of the most promising technologies in the application of glass welding. This technology can obtain the advantages of ecology and cost efficiency without any transition layer, and the whole process of non-contact can be achieved through the laser production steps. Ultrashort pulse laser has the advantages of high precision and no thermal effect, and its damage to the surrounding area is very slight, which makes it very suitable for the above production process, and has perfect performance. For this reason, laser has created many industries, "explained Christopher Wilson, senior vice president of ultra-high polymers of Solvay polymer global business line, which has new opportunities, including the rapidly growing biomedical field and the demanding aerospace industry

in today's industrial field, a key link is to melt and fuse the two materials together to form a piece of material, which can be directly eaten or thrown away in many fields. For example, it is estimated that the safety of a car's parts depends on the reliability of more than 3000 welds. Welding metal is a relatively simple process, which is due to metal 7. Cooler: the crud of air-cooled cooler should be cleaned regularly; When selecting water-cooled ones, regularly investigate whether the cooling copper pipe has the appearance of cracking and water leakage; It has the ability to deform without breaking. Until recently, welded glass has been regarded as a greater challenge by scientists and manufacturers in the industrial field, because of the specific properties of glass, such as this optical transparent material is very easy to crack or break when the temperature changes

isamumiyamoto, an honorary professor at the University of Osaka in Japan, is a pioneer in exploring the physical details of the laser welding process of glass. He worked with Finnish scientists to study how the process of glass welding using ultrafast lasers can improve production efficiency and increase the durability of the final product (Figure 1). Jarnokangastupa, a leading Finnish laser technology expert, said: "today's laser micro welding technology produces a very small heat affected zone (HAZ), so there is no risk of damaging sensitive or organic components. This expands the application potential of encapsulated fragile components, whether it is under or inside the glass. This has been a challenge for manufacturers in the past few years." Kangastupa cooperates with Miyamoto in science

according to kangastupa, using ultrashort laser pulses for glass welding has many advantages, because it means that there is no need for additional layers or adhesives on the substrate in the whole process, which is different from the commonly used methods of eutectic bonding or adhesive bonding. Moreover, it requires far less energy than other traditional glass welding technologies, such as anodic bonding (also known as field induced diffusion bonding) or electrostatic bonding (using an electric field in the welding process)

kangastupa said that packaging is a key element in the design of micro electro mechanical systems (MEMS). The environment in the package is crucial to the efficiency of MEMS device applications, especially for MEMS sensors. The glass encapsulated electronic chips it produces are used in various applications that sense key safety factors such as rotation, acceleration and pressure, including cars, trains and other transportation industries. The same is true of many applications developed in the rapidly growing biomedical field

A key advantage of the laser welding solution (Figure 2) is that it can package sensitive materials more safely and will not be affected by high temperature or chemicals like other existing welding technologies in the whole process

"nowadays, laser welding of glass can connect the separated glass into a whole," according to kangastupa, "This makes the weld have good mechanical properties, which is a very important attribute for the aerospace industry. In space, welded objects, including packaged chip devices such as CMOS (complementary metal oxide semiconductor) Image sensors must maintain a high degree of reliability and air tightness even under the most severe conditions. For example, in extreme weather conditions, they have to face the threat of significantly increased radiation damage. "

he pointed out that the existing technology can connect the glass together to form a seal without high temperature or adhesive, and the welding process itself will not damage the sealed components or materials

"in advanced laser technology, highly concentrated laser beams seal various components to keep them at room temperature," kangastupa continued. "This brings manufacturers a new technological option for the production of electronic, engineering, medical and scientific research equipment, such as implantable chips and sensors."

"unlike using adhesives to connect glass, the joints produced in the process of laser welding glass are almost permanent, because it does not contain any adhesives, and the adhesives will gradually embrittle after the slow evaporation of chemicals." He added

laser welding technology to achieve better medical diagnosis

the R & D Manager of tampereuniversity (tampereuniversity does not allow oil return) said that in the future, laser micro welding technology will play a big role in the biomedical industry. As insiders gradually deepen their understanding of the new laser sealing glass technology, new applications will rise rapidly, such as in the field of human medicine

why is glass welding so important to the biomedical industry? From its characteristics, glass is a kind of material that matches the goal of biomedical technology very well

first, in a sense, glass is a "neutral" substance, which makes it very biocompatible with body fluids when implanted into the human body. This means that it will not cause immune rejection of the implant, and once immune rejection occurs, the implant will have to be removed from the human body. Second, the service life of glass is essentially infinite: if it ends up in a landfill, it can last for hundreds of thousands of years. The glass will not wear, crack, or degrade gradually like many adhesives or other additional substrates used in the welding process. At the same time, different from the application of titanium packaging, glass will not hinder the wavelength of radio frequency (RF), which enables data or energy to be transferred through glass encapsulated components

vihinen noted that with the continuous progress of technology, laser welded glass has become a fast and cost-effective solution, which can assist in the production of new in vitro diagnostic equipment. New in vitro diagnostic equipment can help detect various diseases, physiological conditions and human biological and disease characteristics, which may replace time-consuming and expensive laboratory tests. For example, in the future, the probability of heart attack may be detected by taking a blood sample once

in addition, research shows that in the future, new high-tech brain implants will be able to treat brain injury and memory impairment, which can be regulated by human emotions and even guide our thinking. Research shows that brain implants can also improve human learning ability and even memory by shortening reaction time

laser welder glass makes production more flexible

glass welding brings opportunities to the electronics industry, where the size of handheld devices is shrinking. As long as consumers continue to be interested in portability, the trend of miniaturization will remain. Compared with the first mobile launched by Motorola in the 1970s, today's handheld mobile is completely different. The former weighs an amazing 2.2 pounds

kangastupa said: "When new glass materials are combined with the innovation of laser technology, we can predict that the size of parts will continue to decrease and mobile devices will continue to be miniaturized. It is likely that after integrating all the functions required by extremely thin glass display devices, the second layer of glass will be welded by laser in the final step to protect the display screen. The second layer of glass with sealed welding marks can not only withstand the impact of the environment, but also have more advantages Multiple functions. It can include the thin film layer required by the touch screen and anti reflection characteristics, or some new features that can only be seen in the laboratory. "

he added that laser welding glass can also help manufacturers save costs because it enables a more flexible production process. Manufacturers can evaluate a specific product through trial operation, or make a series of products in small quantities before they have enough confidence in the final result of the production process

according to kangastupa, "if necessary, before starting mass production, you can even package only one product to ensure that everything is OK, such as packaging a microchip."

China glass () Department

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