On December 22, 2017, “Digital Creativity, Printing the Future†– 3D Printing Industry Innovation and Development Summit Forum was grandly opened. The forum was hosted by Zhongguancun Science Park Fengtai Park Management Committee, Beijing Fengtai Science and Technology Park Construction Development Co., Ltd., Zhongguancun Science and Technology The park's Fengtaiyuan 3D printing digital creation center, Fengke Bochuang (Beijing) Technology Service Co., Ltd., and City Renaissance 2050 jointly hosted the development, breakthrough, industrialization, expansion and synergy of 3D printing technology. Industry event.
Mr. Zhang Delong introduced the application of inert atmosphere technology in 3D printing. The atmosphere protection technology can provide the ultimate inert atmosphere for the metal additive manufacturing, and manufacture parts with extremely low or controllable oxygen content and improve the metal. Intensity, toughness and corrosion resistance and its consistency, inert atmosphere technology can also be applied to the production, packaging, storage, transportation and charging of additive raw materials, namely metal powder, to ensure the quality and consistency of raw materials. To ensure the final product quality.
“Although there is no direct 3D printing, what we do will improve the quality of 3D printing products. For the products, everyone is paying more attention to the shape of the product, including the geometry, internal structure and surface smoothness. What we are better at is Control the purity of the product materials, such as the amount of impurities such as oxygen and nitrogen in the metal. We are exploring how to control the content of impurities such as oxygen and nitrogen in 3D printing products, and to control the impurities to the extreme low or a certain and consistent content. Mr. Zhang Delong said.
Effect of oxygen and nitrogen on metal properties
At high temperatures, metals react with moisture and oxygen in the air to introduce oxygen impurities, and metals such as titanium react with nitrogen in the air to introduce nitrogen impurities. At normal temperature, the metal powder can also react with oxygen to introduce oxygen impurities. In addition, in the process of production, packaging, storage, transportation, feed transfer, etc., the 3D printed raw material metal powder will react with oxygen to introduce oxygen impurities if exposed to a trace amount of air.
"Oxygen and nitrogen ions have a great influence on the properties of metals. Therefore, what we do is to control the content of impurities in the atmosphere. By controlling the purity of the gas in the entire industrial chain to ensure the high quality and high purity of the products produced last. We can put the gas The impurities are controlled to the PPB level. If a certain amount of impurities is required in the product, we can control the concentration of oxygen and nitrogen in the product to a desired narrow range by precisely controlling the concentration of oxygen and nitrogen in the inert atmosphere. Achieve consistency in product performance (such as strength, hardness, toughness, corrosion resistance)," said Mr. Zhang Delong.
Industrial method for removing impurities
At present, the methods for removing gaseous impurities in the industry are purging type and circulating type, and the purging type is purging with high-purity inert gas, which is characterized by simple method and equipment, but large gas consumption, high gas impurity concentration and high operating cost. The gas impurities are circulated in a closed space, and the protective atmosphere can reach a very high purity; the circulating type is filled with an inert gas in a closed space, and a gas purification system is used to circulate and remove gas impurities. It is characterized by ultra-high purity and gas saving, but requires a highly sealed chamber and a highly efficient gas purification system.
After returning to China, Mr. Zhang Delong founded Weige Gas and developed the world's only material, a reversible oxygen adsorbent that simulates hemoglobin. After the air passes through, oxygen is completely adsorbed to obtain high-purity gas. Ultra-high purity is also developed. Liquid metal complex. The synthesis, separation and purification (reduced pressure distillation), testing, and packaging of the flammable semiconductor material are carried out in an inert atmosphere apparatus. Atmosphere protection technology is mainly to ensure the quality of the product and to avoid impurities, such as oxygen, moisture, carbon dioxide, etc., reacting with the product to form impurities.
Leak-free sealing technology
In order to achieve high purity, the Zhang Delong team spent a lot of energy to seal. The traditional seal has only one sealing strip. There is always a gap between the sealing surface and the sealing strip. Even if the inside of the device is positive pressure, the air will diffuse into the device through a small gap between the sealing surface and the sealing strip. The leak-free sealing technology developed by Zhang Delong team is a double-channel seal, and a vacuum is applied between the two-way seals. The air is diffused through the first seal and is pumped away. It cannot continue to diffuse through the second seal into the equipment, thus achieving no Leakage seal, the leak rate of the whole set of equipment is less than 0.001% / h, this technology has applied for a patent. In addition, the sealing performance of each seal can be automatically detected, and the PLC automatically checks the airtightness of the two-way seal to promptly report the leaking seal.
Gas purification technology
The principle of gas purification is to remove oxygen by chemical adsorption with oxygen adsorption material, water and organic solvent adsorption material to remove water and organic solvent by physical adsorption, and some materials can react with trace nitrogen at high temperature or even normal temperature, and can be used for removing nitrogen. By reducing the leak rate and increasing the gas purification efficiency, it is possible to remove the gas impurities in an inert atmosphere to the extreme.
Application of inert atmosphere equipment
At present, inert atmosphere equipment is used in a wide range of applications, such as metal 3D printing, chemical, chemical, materials, nuclear industry, OLED display and lighting, lithium batteries, solar cells, semiconductors, pharmaceuticals and medical devices. Water oxygen content, dust, bacteria, etc., improve product quality.
Wig Gas Company Profile
After returning to China in 2005, Mr. Zhang Delong is committed to developing the world's leading technology, striving for excellence, making world-class products, following the concept of honesty, authenticity and price, and upholding a high sense of social responsibility. At the beginning of the company's establishment, it has formulated a development strategy plan for 20 years. The first decade (2005-2015) is to lay the foundation, develop the world's leading core technology, do fine products, develop and produce high-end laboratory equipment, and cultivate talents. Accumulate funds, customer resources, and business experience; the second decade (2015-2025) to carry out large-scale development, expand market share at home and abroad, build an inert atmosphere platform, establish a large-scale industrial production line, and create the world's first brand in the industry. There are nearly 1,000 customers in 36 countries. The current customers are mainly domestic and foreign universities, research institutes and enterprise R&D departments, and have begun to provide production line equipment for the industry. In 2017, sales exceeded 100 million yuan.
(Editor)
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