Magnets and Magnetic Particle Inspection

In summary, Magnetic Particle Inspection is a process used to inspect small objects for defects and other abnormalities.
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Astronuc
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Magnetic Materials - http://www.aacg.bham.ac.uk/magnetic_materials/

Magnetic materials encompass a wide variety of materials, which are used in a diverse range of applications. Magnetic materials are utilised in the creation and distribution of electricity, and, in most cases, in the appliances that use that electricity. They are used for the storage of data on audio and video tape as well as on computer disks. In the world of medicine, they are used in body scanners as well as a range of applications where they are attached to or implanted into the body. The home entertainment market relies on magnetic materials in applications such as PCs, CD players, televisions, games consoles and loud speakers.

It is difficult to imagine a world without magnetic materials and they are becoming more important in the development of modern society. The need for efficient generation and use of electricity is dependent on improved magnetic materials and designs. Non-polluting electric vehicles will rely on efficient motors utilising advanced magnetic materials. The telecommunications industry is always striving for faster data transmission and miniaturisation of devices, both of which require development of improved magnetic materials.

Magnetic materials are classified in terms of their magnetic properties and their uses. If a material is easily magnetised and demagnetised then it is referred to as a soft magnetic material, whereas if it is difficult to demagnetise then it is referred to as a hard (or permanent) magnetic material. Materials in between hard and soft are almost exclusively used as recording media and have no other general term to describe them. Other classifications for types of magnetic materials are subsets of soft or hard materials, such as magnetostrictive and magnetoresistive materials.

Table of Contents
History of Magnetic Materials
Origin of Magnetism
Magnetic Units & Terminology
Classification of Magnetic Materials
Intrinsic Properties of Magnetic Materials
Magnetic Domains
Magnetic Hysteresis
Observation of Magnetic Domains
Hard Magnetic Materials
Soft Magnetic Materials
Magnetic Recording
Other Magnetic Materials



Introduction to Magnetic Particle Inspection
http://www.ndt-ed.org/EducationResources/CommunityCollege/MagParticle/cc_mpi_index.htm
 
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Thanks for sharing @Astronuc . Very good information.
 

1. What is a magnet?

A magnet is an object that produces a magnetic field and attracts certain materials such as iron, nickel, and cobalt. It has a north pole and a south pole, and opposite poles attract while like poles repel.

2. How are magnets made?

Magnets can be made artificially by exposing certain materials to a strong magnetic field. They can also occur naturally in materials such as lodestone, which is a type of iron oxide.

3. What is magnetic particle inspection?

Magnetic particle inspection is a non-destructive testing method used to detect cracks, defects, and other surface irregularities in ferromagnetic materials. It involves the application of a magnetic field and the use of iron oxide particles to indicate the presence of flaws.

4. How does magnetic particle inspection work?

In magnetic particle inspection, a magnetic field is applied to the object being tested, causing the magnetic particles to align with any surface defects. The particles are then applied to the surface, and any defects will form a visible indication, allowing for their detection and evaluation.

5. What are the benefits of using magnetic particle inspection?

Magnetic particle inspection is a highly sensitive and reliable method for detecting surface defects, making it an essential tool in industries such as aviation, automotive, and manufacturing. It is also a non-invasive and cost-effective testing method, making it a popular choice for quality control and safety purposes.

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