English to Portuguese Tech/Engineering Metallurgy / Casting trefilaria

The plasma spray process generates enough heat to melt ceramic powder particles, enabling the application of much harder coatings like chrome oxide. But hardness is not the only factor in wear resistance, and ceramics have some shortcomings
that limit their usefulness. First of ali, they can only be applied up to 0.040" thick. This
means they typically cannot be reground when worn, which can be done 3 or 4 times with
thicker coatings. Secondly, their high hardness inherently makes them very brittle. High
carbon wires, hard stainless wires, and any accidental impact can ali cause the ceramic
coatings to break up. When not exposed to forces that will cause brittle failure, ceramics
last 4-5 times longer than metallizing. They work well on blocks drawing smaller
diameter wires (especially welding wire), and they are also useful for coating pulleys,
sheaves, and rollers.
Another spray