Gold sputtering is a process used to deposit a thin layer of gold onto various surfaces such as circuit boards, metal jewelry, and medical implants.
This process is achieved through physical vapor deposition (PVD) in a vacuum chamber.
The process involves bombarding a gold target or source material with high-energy ions, causing the gold atoms to eject or "sputter" as a fine vapor.
This gold vapor then lands on the target surface, or substrate, forming a fine gold coating.
How does gold sputter coating work? 4 Key Steps Explained
1. Preparation of the Gold Source
The gold sputtering process begins with a source of pure gold in solid form, typically in the shape of discs.
This source is energized either by heat or electron bombardment.
2. Ionization and Suspension
When energized, some of the gold atoms from the solid source are dislodged and suspended evenly around the surface of the part in an inert gas, often argon.
3. Deposition of Gold Vapor
The gold atoms suspended in the inert gas then land on the target surface, forming a fine gold coating.
4. Application and Benefits
Gold is chosen for sputtering due to the exceptional properties of sputtered gold films.
These films are hard, durable, corrosion-resistant, and resistant to tarnishing.
They maintain their sheen for a long time and do not rub off easily, making them ideal for applications in the watch and jewelry industry.
Additionally, gold sputtering allows for fine-grain control over the deposition process, enabling the creation of uniform coatings or custom patterns and shades, such as rose gold.
Overall, gold sputtering is a versatile and precise method for applying gold coatings, offering durability and aesthetic benefits while also being applicable in various industries including electronics and science.
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