Magnetic hard materials. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Magnetic hard materials. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electricity for beginners

Comments on the article

Magnetically hard materials have large values of coercive force and high residual induction, and consequently, large values of magnetic energy.

Hard magnetic materials include:

alloys hardened to martensite (steels alloyed with chromium, tungsten or cobalt);
iron-nickel-aluminum non-forging precipitation hardening alloys (alni, alnico, etc.);
malleable alloys based on iron, cobalt and vanadium (wikkaloy) or based on iron, cobalt, molybdenum (comol);
alloys with a very high coercive force based on noble metals (platinum - iron; silver - manganese - aluminum, etc.);
ceramic-metal non-forged materials obtained by pressing powdered components with subsequent firing of pressed products (magnets);
magnetically hard ferrites;
metal-plastic non- malleable materials obtained from pressing powders consisting of particles of a magnetically hard material and a binder (synthetic resin);
magnetoelastic materials (magnetoelasts), consisting of a powder of a hard magnetic material and an elastic binder (rubber, rubber).

The residual induction of metal-plastic and magneto-elastic magnets is 20-30% less compared to cast magnets from the same hard magnetic materials (alni, alnico, etc.).

Author: Smirnova L.N.

See other articles Section Electricity for beginners.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive

Fire detector in the forest 14.12.2008

The University of Toulouse (France) has developed a sensor that is placed in the forest and measures the moisture content of the leaves.

An infrared beam is passed through the leaf of the selected tree or bush, its intensity, indicating the moisture content in the leaf, is measured by a photodiode. When leaf moisture drops to such an extent that there is a risk of fire, the sensor sends a signal to firefighters through the cellular phone system.

A network of such devices makes it possible to build a constantly updated map of the fire situation in forests.

Other interesting news:

▪ Light leads to the quantum world and the acceleration of supercurrents

▪ Logitech G Pro X Superlight Ultralight Wireless Mouse

▪ Budget 8" tablet Archos 80 Xenon on Android 4.1

▪ Transcend introduces copy-protected memory cards

▪ Cashew shell is UV resistant

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Experiments in chemistry. Article selection

▪ article Program-maximum. minimum program. Popular expression

▪ article To listen to which album do you need four audio systems? Detailed answer

▪ article teacher. Job description

▪ article Modernization of the electric drill. Encyclopedia of radio electronics and electrical engineering

▪ article Phase power regulator. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews