a) Explain a thermal spraying system of your choice using suitable sketch.b) Name the parameters of the process written against QI a).c) Explain the role of one of those parameter_ written against Q 1b).

a) One common type of thermal spraying system is the flame spray system. In this system, a fuel (such as acetylene or hydrogen) and oxygen are combined in a torch to create a flame. The material to be sprayed, in wire or powder form, is fed into this flame where it is melted and then sprayed onto the surface to be coated using compressed air. The molten particles rapidly cool and solidify upon contact with the surface, forming a coating.

Here is a simple sketch of the process:

1. Fuel and oxygen are fed into the torch.
2. The material to be sprayed is fed into the flame.
3. The molten material is sprayed onto the surface using compressed air.

b) The parameters of the flame spray process include:

• The type and pressure of the fuel
• The oxygen pressure
• The feed rate of the material to be sprayed
• The distance between the torch and the surface
• The temperature of the flame
• The air pressure used to spray the molten material

c) The role of the feed rate of the material to be sprayed:

The feed rate of the material to be sprayed is a critical parameter in the flame spray process. It determines the amount of material that is melted and sprayed onto the surface per unit of time. If the feed rate is too high, the material may not fully melt before it is sprayed, resulting in a poor-quality coating. If the feed rate is too low, the process may be inefficient and the coating may be too thin. Therefore, the feed rate must be carefully controlled to ensure a high-quality, efficient coating process.