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How Did The Magnets Produce?
Sep 04, 2017

  How did the magnets produce?

  Iron, cobalt, nickel or ferrite and other ferromagnetic materials are different, its internal electronic spin can be spontaneously arranged in a small range to form a spontaneous magnetic zone, this spontaneous magnetic domain called magnetic domain. Ferromagnetic material magnetization, the internal magnetic field neat, aligned in the same direction, so that the magnetic enhancement, it constitutes a magnet. Magnet iron absorption process is the magnetization of the iron process, magnetized iron and magnets have different attraction between the polarity, iron is firmly with the magnet "sticky" together.

  Natural magnets are iron oxide, and man-made magnets are usually steel. Steel after magnetization will always retain the magnetic general refers to the natural permanent magnet is not just ferrite (iron oxide), as well as iron cobalt nickel alloy, iron rare earth alloy and other permanent magnetic materials, such as aluminum nickel Cobalt, samarium cobalt, neodymium iron boron, these are also very common, very strong magnetic, these substances can be magnetic field magnetic field magnetization, and magnetization itself has a magnetic and does not disappear. The composition of the artificial magnets is based on the magnetization properties of the various metals, as required. Magnet close to (touch) magnetic material, the material near the end of induction into a different name, and the other end is the same name.

  Magnet classification

  A. Temporary (soft) magnets

  a. Meaning: magnetic short, when the magnet removed after the magnetic disappeared. b. Example: nails, wrought iron

  B. permanent (hard) magnets

  a. meaning: magnetization, long-term preservation of magnetic. b. Example: steel nail

  According to the above information is summarized as follows: According to the principle of electromagnetic induction, a strong current can produce a strong magnetic field, the use of strong magnetic field magnetization of ferromagnetic material, and because of different material magnetization is not the same, some substances easy to magnetize, Magnetic (loss of magnetic), can be a long time to keep the magnetic. The magnetization of this material produces magnets. Use a magnetizer to magnetize the hard magnet.

  According to the principle of electromagnetic induction, the current can produce magnetic field, the use of strong magnetic field magnetization of hard magnetic material is generally known as the magnet of the magnetic material, in fact, several different things: the most common magnets, such as the general speaker with the magnet, Fog magnets. They are used in the hot rolling process of steel from the billet rolling off the surface of the scale (in the form of sheet of iron oxide), after impurity removal, crushing and then add a small amount of other substances, into the steel mold pressure molding , And then in the reductive furnace (hydrogen) sintering, so that part of the oxide reduction was ferrite, cooling, and then placed in the exciter to magnetize produced.

  Heavier than they are magnets: magnet is the real steel, composed of iron, the main high content of nickel. It is generally smelted with intermediate frequency electric furnace (only 100 kilograms per furnace), casting molding, because some of its plane precision requirements, generally have to use grinding machine grinding. And then magnetized, as a product. All kinds of metering power meter used in this magnet. More advanced magnetic material, is NdFeB type magnetic material. They are substances containing rare earth elements neodymium, iron and boron. The production is made of cemented carbide: it is made by milling - mixing - molding - sintering - finishing - magnetizing. Such magnetic materials have the highest magnetic field strength, the best performance, the most expensive price. Is the defense of military and precision equipment will be used. The rotor in the electronic watch is the rotor of the stepper motor. Ah, maglev train is certainly used in this kind of magnetic material. Ferrite permanent magnet materials are: strontium - ferrite permanent magnet material and barium - ferrite permanent magnet material, which has isotropic and anisotropy of the points, the speaker magnet commonly used ferrite permanent magnet material ; Metal permanent magnet materials are mainly aluminum and nickel cobalt permanent magnet materials and rare earth permanent magnet materials. Rare earth permanent magnet materials are divided into: samarium cobalt permanent magnet materials and NdFeB permanent magnet materials. Rare earth permanent magnet material is made by powder metallurgy process. Magnetic strength I have not found any convincing information for the time being.

  The classification of the magnet too much, I would simply say here:

  There are two main types of magnetic materials: the first is the permanent magnet material (also known as hard magnetic): the material itself has the characteristics of preservation of magnetic force. The second is soft magnetic (also called electromagnet): the need for external power to produce magnetic force, we are said that the magnet is generally referred to as permanent magnet material.

  There are two major categories of permanent magnet materials: the first category is: alloy permanent magnet materials include rare earth permanent magnetic materials (NdFeB Nd2Fe14B), SmCo (SmCo), neodymium nickel cobalt (NdNiCO). The second category is: ferrite permanent magnet material (Ferrite) according to the production process is divided into: sintered ferrite (Sintered Ferrite), bonded ferrite (rubber magnetic rubber Magnet), injection ferrite (Zhusu Ferrite ), The three processes according to the different orientation of the magnetic crystal and are divided into isotactic and heterogeneous magnets.