Special nano-alumina for solder stop protection coatings

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Nan alumina specialized for solder inhibition protective coatings \"Research on Advanced Zirconium Materials\" Xiao Shan, October 2015, Issue 2. The nan alumina coating made from UG-L80T nan alumina produced by Suzhou Youzirong possesses excellent capabilities for solder inhibition and high-temperature protection; it also exhibits good adhesion to various substrates, good chemical stability, and relatively strong adsorption capacity. The nano-alumina coating contains over 95% UG-L80T nano-alumina powder, which gives it the special properties of both nanoparticles and alumina ceramics. Firstly, due to its small size, large specific surface area, high surface energy, a significant proportion of atoms on its surface are in a state of severe vacancy, nanalumina UG-L80T is highly reactive and extremely unstable. It quickly bonds with other atoms upon contact, thereby becoming stabilized. This property enables the nanalumina coating to have good adhesion to various substrates. Secondly, alumina UG-L80T relies on ionic bonds, whereas metal solders rely on metallic bonds; as a result, metal solders find it difficult to wet the alumina material. Therefore, as long as there is a layer of alumina material on the surface of the substrate, the solder will be unable to flow any further. Third, the nano-coating itself, due to the large specific surface area and high surface activity of nano-alumina UG-L80T, exhibits a strong interaction with gases and is highly sensitive to its surrounding environment; as a result, it can adsorb gas components that are harmful to the substrate, thereby providing effective protection for it. Nan alumina-based coatings were prepared using alumina powder UG-L80T, with phase a nan alumina being used as the main component to prevent cracking of the coating during application and sintering. Nan alumina-based coatings can form a protective layer with relatively strong adhesion and density on the surfaces of various metal and ceramic materials. This coating effectively prevents welding and can withstand temperatures up to 1140 degrees. It also has good rust-removing properties and does not have any adverse effects on the devices to which it is applied. The reason why the nano-alumina coating possesses excellent solder resistance and high-temperature protection properties is that it combines the characteristics of both nanomaterials and alumina materials; it can form good adhesion with various substrates, and it also has good chemical stability as well as a relatively strong ability to adsorb gases.