Aspherical glass lens is a very important optical component with high imaging quality and resolution, which is widely used in aviation, aerospace, astronomy, laser, medicine and other modern high-tech fields.
Although the traditional glass grinding and polishing technology has its own unique advantages, it takes a lot of time to process aspherical lenses and the production efficiency is low. At present, glass molding technology is used to process glass lens, which has the characteristics of short material flow distance, high forming accuracy and suitable for mass production. However, in the glass molding process, the mold and high chemical activity of molten glass contact, under mechanical stress and thermal cycle operation, easy to make the mold surface wear and oxidation, resulting in mold and glass adhesion, and ultimately make it unable to use again failure, increasing the production cost of the product. Therefore, the surface of the glass mold needs to deposit a protective layer, which must have high strength, wear resistance, heat resistance and high temperature oxidation resistance and other properties, and does not react with molten glass. The surface coating of aspherical glass mold can prolong the service life of the mold, greatly reduce the processing cost of aspherical lens, and realize the large-scale production of aspherical lens, which has significant economic value and social benefit.
Rhenium iridium alloy coating has high hardness, high oxidation resistance, high mechanical stability, wear resistance, high temperature resistance and mold release. Therefore, rhenium iridium alloy coating can be used as a new functional protective coating against chemical corrosion and glass adhesion of die surface. At present, magnetron sputtering is generally accepted as a good preparation method for rhenium iridium alloy coating, but the preparation cost is high and the equipment cost is expensive. The rhenium iridium alloy coating with excellent performance is prepared by a low cost electrodeposition method and has a wide application prospect.
