Ceramics are strong, lightweight and more heat resistant than many metals, making them ideal for aircraft or rocket parts. Recently, a new type of 3D printing technology developed by the well-known research institute HRL Labs allowed them to overcome the limitations of traditional ceramic processing and create solid, flawless ceramic products. For example, the spacecraft on the shuttle is made of ceramic. Ceramic 3D printers can build spaceships The researchers said their technology will enable anyone to 3D print virtually unbreakable ceramics that can be made into complex, curved or porous shapes. One of the main advantages of ceramics is their high stability at high temperatures, in addition to their excellent environmental resistance and strength. Researchers have been searching for ways to 3D print ceramics, one of the major hurdles being the properties of ceramic particles, as these ceramic particles do not join together when heated. As a result, the few 3D printing technologies that have been developed to produce ceramics are slow and the resulting articles are also prone to cracking. Zak Eckel, senior chemist at HRL, and Chaoyin Zhou, a senior chemist, modified these processes with silicone-based polymers to limit the UV light during polymerization so that UV-cured steps are not required for add-ons. The invention is basically a resin formulation that can be 3D-printed to almost any shape and size. "Our team overcame the inherent challenges of ceramic technology and developed a new material that has countless uses in a wide range of industries," explained Dr. Tobias Schaedler, senior scientist at HRL Sensors and Materials Laboratory. "The resulting material can withstand temperatures in excess of 1700 ° C and exhibit ten times more strength than similar materials." When the polymer is printed, the part is heated to a high temperature to burn off the oxygen atoms to form a highly dense and strong silicon carbide product that can withstand temperatures in excess of 1700 ° C and exhibit ten times higher than similar materials strength. "From large components of jet engines and supersonic aircraft to complex parts in microelectromechanical systems and electronics packages, this can be done," explains Schaedler. Further technical information for this study, funded by HRL and DARPA, is included in this month's Science paper, volume 351, 6268, lines 58-62. "The extremely high melting point of ceramics increases the challenge of additive manufacturing compared to metals and polymers." 3D printing is a big leap forward in terms of geometrical plasticity because ceramics are not easily cast or processed, and the organic monomers we report UV cured on a photo-cured 3D printer or through a patterned mask to form a 3D polymer structure having a complex shape and a honeycomb structure.
Brass forging is the same as other metal forgings, the main feature is that it can change the internal structure of the metal and improve the mechanical properties of brass. The original state of forged brass materials includes brass bar, brass ingot, brass powder and liquid brass, etc. The bar has uniform grain structure and mechanical properties, accurate shape and size, and good surface quality, suitable for demanding and mass production. Because brass has the characteristics of wear resistance, good electrical conductivity and good corrosion resistance, copper forgings are often used in marine projects, automotive machinery, communications, plumbing and other industries.
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