What are the key properties of magnetic particles used in Magnetic Particle Testing?

The key properties of magnetic particles used in Magnetic Particle Testing revolve around their ability to form visible indications of discontinuities in ferromagnetic materials. Magnetic permeability is essential because it determines how the particles respond to magnetic fields; particles with high permeability readily magnetize, allowing them to be drawn to the surface and accumulate at defects.

Particle size is also crucial, as it influences the sensitivity of the test; smaller particles can penetrate tighter cracks and offer greater detail in the detection of discontinuities. Additionally, adherence is important since particles must stick to the surfaces of defects for the indications to be visible and meaningful. Together, these properties enable effective detection and evaluation of flaws in components undergoing inspection, making this choice the correct one in the context of Magnetic Particle Testing.