What term describes the oxygas coating process that uses lower temperatures than thermal spraying?

• A. Plasma spray.
• B. Metallization.
• C. Cold spray.
• D. Flame spray.

Answer: (B)

Metallization refers to applying a metal coating using an oxygas flame spray. In this method, the coating material is heated by a flame to a molten state and sprayed onto the surface. Because the process relies on flame heating rather than the higher-energy methods used in other thermal spraying, it operates at lower temperatures than those techniques. Cold spray wouldn’t be described as an oxygas coating process since it uses no flame and involves solid particles accelerated at high velocity. Plasma spray and flame spray are both thermal spray methods with higher heat input, so they don’t fit the description of a lower-temperature oxygas coating process.