Before we dive into the types of high-temperature resistant magnets, let\u2019s talk about how the ambient temperature affects the magnetic properties. In general, heat reduces the strength of a magnet, and cold increases its magnetism. High-temperature environments can cause magnets to lose some of their magnetization permanently, depending on how far above the magnet\u2019s limits the operating temperature is.<\/p>\n
1) Maximum Operating Temperature vs. Curie Temperature:<\/strong><\/p>\n Every magnet has a maximum operating temperature where it starts losing its magnetic properties. Once you exceed this temperature, you\u2019ll have irreversible magnetic loss. The Curie temperature is the point where a magnet loses all magnetization. Both of these temperatures are different for different types and grades of magnets.<\/p>\n 2) Reversible vs. Irreversible Magnetic Loss:<\/strong><\/p>\n If you heat a magnet above its maximum operating temperature but not to its Curie temperature, it may experience reversible loss. This means the magnet\u2019s strength can come back once it cools down. However, if you expose it to extreme temperatures for a long time or get it up to Curie temperature, you\u2019ll have irreversible loss. This means the magnetism will not come back.<\/p>\n \u00a0<\/strong><\/p>\n Here are the most common high-temperature resistant magnets you can use. Each one has unique properties that make it good for different applications.<\/p>\n Maximum Operating Temperature:<\/strong> Up to 525\u00b0C<\/p>\n Curie Temperature<\/strong>: ~850\u00b0C<\/p>\n AlNiCo magnets are made from an alloy of aluminum, nickel, cobalt, and iron. They can handle the highest temperatures of any commercial magnets, going up to 525\u00b0C. People use them in sensors, guitar pickups, and high-temperature industrial applications because they are so thermally stable. Although they\u2019ve been replaced by more powerful rare-earth magnets in many applications, people still like to use AlNiCo magnets in places with extreme heat.<\/p>\n Maximum Operating Temperature: Up to 250\u00b0C<\/p>\n Curie Temperature: ~450\u00b0C<\/p>\n Ferrite magnets, also called ceramic magnets, are made mostly from iron oxide and other metallic elements. Although they have a lower temperature limit than other high-temperature magnets, they\u2019re inexpensive and electrically insulating. You\u2019ll find them used in transformers and computer cables because they\u2019re an economical solution for applications that don\u2019t exceed 250\u00b0C.<\/p>\n Maximum Operating Temperature: 310-400\u00b0C<\/p>\n Curie Temperature: ~700\u00b0C<\/p>\n Samarium Cobalt (SmCo) magnets are very durable, having high magnetic strength and excellent temperature resistance. These magnets are great for high-temperature environments, especially in aerospace and automotive engineering. They\u2019re more resistant to corrosion and oxidation than neodymium magnets and have excellent demagnetization resistance. That\u2019s why you see them used in applications with both high and low-temperature extremes.\u00a0<\/strong><\/p>\nCommon Types of High-Temperature Resistant Magnets<\/strong><\/span><\/h2>\n
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