Application of niobium sheets in the manufacture of commemorative coins

Because of its unique physical and chemical properties, niobium sheets have important application value in the field of commemorative coin manufacturing. The following is a detailed analysis of its specific applications:

1. Material characteristics of niobium sheets
Niobium plates have high melting point, low density, good corrosion resistance and excellent mechanical properties. These characteristics make niobium plates perform well in the manufacture of commemorative coins. For example, niobium plates are very stable in air, do not react with air, and have good oxidation resistance even at high temperatures. In addition, the niobium sheet can be anodized to form a different color oxide layer, thus giving the commemorative coin a unique visual effect.

2. The specific application of niobium sheets in commemorative coins
The color change characteristics of niobium tablets make them have unique advantages in the design of commemorative coins. By anodizing, niobium tablets can show a variety of colors such as blue, green, brown, purple and yellow, which are produced by diffraction of the oxide surface. This unique visual effect not only increases the ornamental value of the commemorative coins, but also makes them more attractive in the collection market.

3. Manufacturing process of niobium commemorative coins
3.1 Material selection and processing
When making silver-niobium bimetallic commemorative coins, it is first necessary to select high-purity niobium tablets and silver materials. The niobium sheet is specially anodized to form an oxide layer of different colors, while the silver material is used to make the outer ring.

3.2 Mold design and stamping
The mold design of commemorative coins is an important link in the coinage process. The design pattern is transferred to the mold through high-precision engraving technology, ensuring the detail and layering of the pattern. During the embossed process, the niobium inner core and the silver outer ring are precisely combined together to form a complete commemorative coin.
3.3 Surface treatment and quality control
After the stamping is completed, the commemorative coin needs to be treated to ensure that its surface is bright and flawless. Each commemorative coin is subjected to rigorous quality testing, including weighing, dimensional measurement and surface inspection, to ensure that it meets standards.

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