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1. How to Order Magnets?
1. What material, performance?
2. Dimensions and tolerances?
3. Is magnetization required? To magnetize, what is the axial direction? Radial?
4. What is the maximum working temperature of the magnet?
5. Order quantity?
6. Surface treatment? Galvanized, nickel plated?
7. For special treatment, please inform.

 

2. Magnetic material analogy
Ferrite low and medium, the lowest price, good temperature characteristics, corrosion resistance, good cost performance.
NdFeB the highest performance, price, strength, and high temperature and corrosion resistance.
Samarium cobalt high performance, the highest price, brittle, excellent temperature characteristics, corrosion resistance.
Al nickel and cobalt low and medium, the price, excellent temperature characteristics, corrosion resistance, poor resistance to interference.
SmCo, ferrite, neodymium iron boron can be sintered and bonded method of manufacturing, sintering magnetic properties of high, poor molding, bond magnet forming good performance reduced a lot.
AlNiCo can be manufactured by casting and sintering methods, casting magnet performance is higher, less good formability, sintered magnet is low, good shape.

 

3. NdFeB by those materials?
Nd-Fe-B permanent magnets are mainly composed of 32% rare earth metal neodymium (Nd), 64% metallic elemental iron (Fe) and 1% non-metallic element boron (B) (minor addition of dysprosium (Dy), terbium (Tb) (Co), niobium (Nb), gallium (Ga), aluminum (Al), copper (Cu) and the like). NdFeB ternary system of permanent magnetic material is Nd2Fe14B compounds as a matrix, and its composition should be similar to the compound Nd2Fe14B formula. But completely according to Nd2Fe14B composition ratio, the magnetic properties of the magnet is very low, even non-magnetic. Only the actual magnets neodymium and boron content than Nd2Fe14B compounds of neodymium and boron content for a long time to get better permanent magnetic properties.
NdFeB magnetic material, as the latest development of rare earth permanent magnet materials, due to its excellent magnetic properties and known as the "magnetic king." NdFeB has a very high energy product and force, while the advantages of high-energy density NdFeB permanent magnetic materials in modern industrial and electronic technology has been widely used, so that the instrumentation, electro-acoustic motor, magnetic magnetization And other equipment, miniaturization, lightweight, thin possible. NdFeB advantage of cost-effective, with good mechanical properties; the inadequacy of the Curie temperature is low, the temperature characteristics of poor, and easy to powder corrosion, must be adjusted by the chemical composition and surface treatment methods to make it improved , In order to achieve the practical application requirements.
Sintered NdFeB-sintered NdFeB permanent magnets are smelted by air-jet milling and have high coercive force and high magnetic properties. Their maximum energy product (BHmax) is higher than Ferrite (Ferrite) more than 10 times. Its own mechanical properties are quite good, you can cut a different shape and drilling. High-performance products, the maximum operating temperature of up to 200 degrees Celsius. Because of its material content easily lead to corrosion, so according to different requirements of the surface must be different coating. (Such as galvanized, nickel, green zinc, green nickel, nickel-copper-nickel, nickel-nickel-nickel, etc.). Very hard and brittle, with high demagnetization resistance, high cost / performance ratio, not suitable for high operating temperatures (> 200 ℃).

 

4. NdFeB magnetic properties can last long?
NdFeB magnet has a very high coercive force, the natural environment and general magnetic field conditions will not appear demagnetization and magnetic changes. Assuming the proper environment, even after prolonged use, the magnetic properties of the magnet loss will not be great. Therefore, in practical applications, we tend to ignore the time factor on the magnetic properties.

 

5. What is the operating temperature range of NdFeB magnets?
The temperature limitation of the NdFeB magnets led to the development of a series of magnets to suit different operating temperature requirements. Please refer to our performance catalog to compare the operating temperature range of the magnets. Before selecting NdFeB magnets, please confirm the maximum operating temperature.

 

6 factors affecting the magnetic properties of NdFeB magnets
Ambient temperature, the sintered NdFeB is extremely sensitive to working temperature, the environment of the maximum instantaneous maximum temperature and maximum temperature may have different degrees of magnet demagnetization, including reversible and irreversible, recoverable and unrecoverable.

 

7. Commonly used magnetic measuring instruments
Commonly used magnetic measuring instruments are: flux meter, Tesla meter (also known as Gauss meter), magnetic measuring instrument. The fluxmeter is used to measure the flux of magnetic flux, the Tesla meter is used to measure the surface magnetic field strength or the air gap magnetic field strength, and the magnetometer is used to measure the integrated magnetic performance. All instruments should be carefully read before using the instructions, according to the requirements of pre-heating, preheating in accordance with the requirements of the manual operation.

 

8. How is NdFeB made?
Sintered NdFeB permanent magnet is the application of powder metallurgy process to manufacture an iron-based permanent magnet material. The main processes are: recipe, smelting, milling, forming orientation, sintering, machining, electroplating treatment. Which control the oxygen content is an important indicator of the level of technology to measure. The high vacuum melting, sintering furnace and advanced automatic controlled air grinding are adopted in the production equipment of our company to ensure the basic oxygen-free operation of the production process, and the performance and temperature of the products are greatly improved.

 

9. How to shield magnetic field?
In general, we use ordinary iron shielding magnetic field. Magnetically shielded materials require high permeability, to meet this requirement is iron-nickel alloy material, this material has a high permeability. When the need to shield the magnetic field is strong, only a single layer of shielding material, not reach the shielding requirements, that is, will occur saturation. In this case, one method is to increase the thickness of the material. But a more effective method is to use a combination of shielding, a shield placed in another shield, leaving an air gap between them. The air gap can be filled with any non-magnetic material to do support, such as aluminum. The shielding effectiveness of the combined shield is much higher than that of a single shield, so the combined shield can attenuate the magnetic field to a very low level.

 

10. What are the precautions for storing and transporting magnets?
Magnets in the room to keep ventilated dry, otherwise the wet environment can easily lead to corrosion of magnets. Magnetic products, storage should be away from disk, magnetic cards, tapes, computer monitors, watches and other objects sensitive to the magnetic field. Do not exceed the ambient temperature of the maximum operating temperature of the magnet; not plated products stored properly oiled anti-rust; Magnets should be shielded during transportation, especially if they are used in aviation. If the magnets are damaged, they may be damaged or cracked. If the method is improper, Transport must be completely shielded.

 

11. What are the precautions for magnet operation?
Magnet in the course of the work should ensure that the workplace clean, or easy to absorb iron and other small magnetic particles affect the use of; NdFeB material is characterized by hard and brittle, and its suction up to 600 times its own weight, easy to pull Collision damage. Operation of the small size should be careful to avoid bump damage, for large size should pay more attention to personal safety and protection.

 

12. Coating from the skin of the causes and the cause of rust is what?
Qualified electroplating products, under normal circumstances, electroplating coating should not appear rust. In the case of too humid, poor air circulation, large temperature changes, even if the salt spray test qualified long-term storage of products in harsh environments may produce rust. When the electroplating products stored in the harsh environment, the basal layer of further reaction with the condensed water, will result in the base layer and the coating of the lower binding force, but also cause serious local powder base, and then from the skin. Plating products should not be placed in a long-term high humidity, should be placed in a cool, dry place.

 

13. How to measure the level of magnetic performance?
There are three main parameters: Residual Induction (Br), unit Gauss, from the saturation state to remove the magnetic field, the remaining magnetic flux density, on behalf of the magnet can provide external magnetic field strength; coercivity Hc (Coercive Force) Oersteds, the magnet is placed in a reverse magnetic field, when the external magnetic field increases to a certain intensity when the magnet's magnetic will disappear, the resistance to external magnetic field called coercive force, representing the measure of anti-demagnetization; magnetic energy Product BHmax, unit Gauss-Oersteds, is the unit volume of material generated by the magnetic field energy, the magnet can store the amount of energy a physical quantity.

 

14. Magnet processing costs of the factors?
Magnet processing costs are mainly affected by the following factors: performance requirements, batch size, size, shape, tolerance size. The higher the performance requirements, the higher the cost, such as N45 magnet prices are much higher than the N35 price; batch size, the higher the cost of processing; shape more complex, higher processing costs; more stringent tolerance, the higher the cost of processing

 

15. Regarding the orientation direction
Orientation: Anisotropic magnet to obtain the best direction of the magnetic properties of the magnet orientation. Magnet is divided into 1 isotropic magnet: any direction the same magnetic properties of the magnet 2 anisotropic magnet: magnetic properties in different directions will be different; and there is a direction that the orientation direction, orientation in the direction of the magnetic properties of the highest magnet. The sintered NdFeB permanent magnet is an anisotropic magnet, and thus it is necessary to determine the orientation direction (magnetization direction) before production.

 

16. Are permanent magnets standard?
No, under normal circumstances are customized for customers; individual cases, we can help customers to design according to the approximate size. In addition, we can not produce any size products because of the comprehensive ability. Please refer to the "size and shape" in our website or color page.

 


17. What are the packaging? Which method of protection is better?
Our packaging methods are: conventional bagging, plastic tube packaging, vacuum packaging and body-fitted packaging, can also be customized according to customer requirements Packaging. All the packaging can get a better protective effect, the reason for classification, first, and customer use, and the second is the size of the product, such as: too large a product can not use plastic pipe or vacuum packaging the way. Each product which packaging the most appropriate use, is the need to decide the size of the product.

  

18. How to check the rough performance?
(2) in the blank box on the take-off about 10X15mm test sample column; (3) the use of magnetic automatic detection instrument for the furnace of a number of columns for testing, the detection of the blank, Get the results; ④ all data analysis, determine whether the material qualified.

 

19. How to deal with customer complaints?
Clerk received a customer complaint, it will immediately fill out the "customer feedback record" above the customer complaint information, by the quality control department to identify the reasons, and fill in the "customer feedback records" below the views, and then pay the clerk to Customer response to disposal matters. If necessary, to submit 8D report.

 

20. Why can not generally use the table magnet (surface Gaussian value) to determine the magnetic properties, can only do a basic basis?
Because the surface Gaussian value is measured by the Gauss meter and a point on the surface of the product measured the point value, the measurement point is not covering the entire surface, Each Gauss meter has about 2% of the error. At the same time, we will certainly have measurement errors in the measurement process, because in the same product can not find the exact coincidence of the two points. Therefore, the table can only be a magnetic reference to the basic, can not be used to determine the performance of the product. Typically, we will use the flux value to determine whether the product's performance is satisfactory.

 

21. Can you make an unsaturated magnetization magnet?
No. Because the performance of each batch of magnet will fluctuate within a certain range, the saturation magnetization voltage is difficult to adjust;
Unsaturated magnetization of the product performance is very unstable, in use will produce changes.

 

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