One, there are many kinds of magnet, generally divided into two types: permanent magnetic and soft magnetic, what we call the magnets, generally refers to the permanent magnet.
Permanent magnet divides two categories: the first major categories are: metal alloy magnet ndfeb magnet Nd2Fe14B)
, samarium cobalt magnet (
, aluminum nickel and cobalt magnet (
The second major categories are: ferrite permanent magnet material (
Commercialization of 1, ndfeb magnet, it is found that the highest performance magnets, known as magnetic king, has the extremely high magnetic to its maximum magnetic energy product (
Above ferrite (
More than 10 times.
Machining properties of its itself is also quite good.
Working temperature up to 200 degrees Celsius.
And the quality of a material is solid, stable performance, good cost performance, so its application is very extensive.
But because of its chemical activity is very strong, so you have to handle with polish on the surface layer.
Such as zinc plating, Ni, electrophoresis, passivation, etc. )
Ferrite magnets: it is the main raw material includes BaFe12O19 and SrFe12O19.
Manufactured by ceramic technology, the quality of a material is hard, brittle material, because of the ferrite magnets have good temperature resistance, low cost, moderate performance, has become the most widely applied permanent magnets.
Alnico magnets, is made from aluminum, nickel, cobalt, iron and other trace metal elements constitute a kind of alloy.
Casting process can be processed into different sizes and shapes, machinability is good.
Casting aluminum nickel and cobalt permanent magnet has the lowest temperature coefficient is reversible, working temperature can be as high as 600 degrees Celsius above.
Alnico permanent magnet products are widely used in all kinds of instruments and meters and other application fields.
4, samarium cobalt (
According to the composition of different divided into SmCo5 and Sm2Co17.
Because its material is expensive and make its development was restricted.
Samarium cobalt (
As a rare earth permanent magnets, not only have higher magnetic energy product (
And reliable coercive force and good temperature characteristic.
Compared with the ndfeb magnets, samarium cobalt magnet is more suitable for working in high temperature environment.
Two, the history of the magnet: the application of the magnet is more and more widely, from high-tech products to the most simple packaging, the most widely used or ndfeb magnets and ferrite magnets.
From the development history of the magnet, the end of the 19th century in the early 20th century, the main use of carbon steel, tungsten, cobalt chromium steel and steel for permanent magnetic material.
Developed in the late 1930 s, alnico magnets, makes the magnet the large-scale application of possible.
50 s, the emergence of barium ferrite magnets, reduces the cost of permanent magnets, and to broaden the application scope of permanent magnet materials to high frequency field.
To 60 s, samarium cobalt permanent magnet, is for the application of the magnet has opened up a new era.
In 1967, the United States at the university of Dayton Strnat etc. , to develop into a samarium cobalt magnet, marks the arrival of the era of rare earth magnets.
So far, ten permanent magnet has experienced the first generation of SmCo5, dilute the second generation Sm2Co17 precipitation hardening type, development to the third generation of Nd -
B permanent magnet materials.
Far the largest permanent magnet ferrite magnet is still the dosage, but the ndfeb magnet production is much more than ferrite permanent magnet, ndfeb magnet production has developed into a big industry.
Three, magnetic size for: ndfeb magnets, samarium cobalt magnet, alnico magnets, ferrite magnets.
Four, magnet technology: ndfeb magnets, samarium cobalt magnet, alnico magnets, ferrite magnet technology is also different from process 1, ndfeb magnet, a sintered ndfeb magnets and adhesive ndfeb magnets, we mainly speak of sintered ndfeb magnet.
Ndfeb magnet process is as follows: process: ingredients to smelting tableting, pulverizing to molding, sintering and tempering magnetic detection to grinding to pin cutting processing, electroplating, finished product.
Sintering tempering of ingredients is a foundation, is the key ndfeb magnet production tools: a melting furnace, a broken machine, ball mill, jet mill, pressing molding machine, vacuum packaging machine, such as static pressure machine, sintering furnace, vacuum heat treatment furnace, magnetic tester, gauss meter.
Ndfeb magnet processing tools: is there a special slicing machine, cutting machine, flat grinding machine, double-sided machine, punching machine, chamfering machine, plating equipment for 12 years specializing in the production of magnet manufacturers -
Magnetic technology co. , LTD. The magnet powerful magnet magnet manufacturer in an article: - magnet factory
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