1. How to order magnets?

1. What material and performance?

2. Dimensions and tolerances?

3. Do you want to magnetize? To magnetize, which way, axial? Radial?

4. What is the maximum temperature of the working environment of the magnet?

5. Quantity ordered?

6. Surface treatment? Galvanized, nickel-plated?

7. If special treatment is required, please inform.

2. Magnetic material analogy

Ferrite has low and medium performance, the lowest price, good temperature characteristics, corrosion resistance, and good performance-price ratio.

NdFeB has the highest performance, medium price, good strength, and is not resistant to high temperature and corrosion.

Smco has high performance, the highest price, brittleness, excellent temperature characteristics, and corrosion resistance.

Alnico has low and medium performance, medium price, excellent temperature characteristics, corrosion resistance and poor interference resistance.

SmCo, ferrite, neodymium iron boron can be manufactured by sintering and bonding methods. The sintered magnetic properties are high, the molding is poor, the bonded magnets have good moldability, and the performance is greatly reduced.

AlNiCo can be manufactured by casting and sintering methods. Cast magnets have high performance and poor formability. Sintered magnets are low and formability

3. Which materials are NdFeB made of?

The main raw materials of neodymium iron boron permanent magnet are rare earth metal neodymium (Nd) 32%, metal element iron (Fe) 64% and nonmetal element boron (B) 1% (a small amount of dysprosium (Dy), terbium (Tb), cobalt (Co), niobium (Nb), gallium (Ga), aluminum (Al), copper (Cu) and other elements). NdFeB ternary permanent magnet material is based on Nd2Fe14B compound, and its composition should be similar to that of compound Nd2Fe14B. However, when the Nd2Fe14B component ratio is used completely, the magnetic properties of the magnet are very low, or even non-magnetic. Only when the content of neodymium and boron in the actual magnet is more than that of the Nd2Fe14B compound can good permanent magnet properties be obtained.

NdFeB magnetic materials, as the latest result of the development of rare earth permanent magnet materials, are called "Magnetic Kings" due to their excellent magnetic properties. NdFeB has extremely high magnetic energy product and coercive force, and at the same time, the advantages of high energy density make NdFeB permanent magnetic materials widely used in modern industry and electronic technology, thus instrumentation, electroacoustic motors, magnetic separation magnetization It is possible to reduce the size, weight, and thickness of other equipment. The advantages of neodymium iron boron are high cost performance and good mechanical properties; the shortcomings are that the Curie temperature is low, the temperature characteristics are poor, and it is easy to pulverize and corrode. It must be improved by adjusting its chemical composition and adopting surface treatment methods in order to meet the requirements of practical applications.

Sintered NdFeB-Sintered NdFeB permanent magnet is smelted by air milling powder, the coercive force value is very high, and has extremely high magnetic properties, its maximum magnetic energy product (BHmax) is higher than Ferrite (Ferrite) more than 10 times. Its own mechanical properties are also quite good, it can cut and process different shapes and drill holes. The maximum operating temperature of high-performance products can reach 200 degrees Celsius. Due to its substance content is easy to cause rust, so the surface must be treated with different coatings according to different requirements. (Such as zinc plating, nickel, environmental protection zinc, environmental protection nickel, nickel copper nickel, environmental protection nickel copper nickel, etc.). Very hard and brittle, with high resistance to demagnetization, high cost/performance ratio, not suitable for high operating temperatures (>200°C).

4. How long can the magnetic properties of NdFeB last?

NdFeB magnets have a relatively high coercive force, and there will be no demagnetization and magnetic changes under natural environment and general magnetic field conditions. Assuming an appropriate environment, even after a long period of use, the magnetic performance of the magnet will not be greatly lost. Therefore, in practical applications, we often ignore the influence of time on magnetic performance.

5. What is the operating temperature range of NdFeB magnets?

The temperature limitation of NdFeB magnets has led to the development of a series of magnets to adapt to different operating temperature requirements. Please refer to our performance catalog to compare the operating temperature range of each magnet. Need to confirm the maximum operating temperature before choosing NdFeB magnet

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. What is the cause of the coating peeling and the cause of rust spots？

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 performance of the blank?

The method of detecting the performance of the blank is: ① sampling the whole furnace material before and after; ② taking a test sample column of about 10X15mm on the square of the blank; ③ using a magnetic performance automatic tester to test several sample columns of the furnace, Obtain the result; ④ Analyze all the data to determine whether the material is qualified.

19. How to deal with customer complaints?

After receiving the customer complaint, the salesperson will immediately fill in the customer complaint information above the "Customer Feedback Disposal Record", hand it to the quality control department to find out the reason, and fill out the processing opinions under the "Customer Feedback Disposal Record", and then submit the salesperson to The customer replies to disposal matters. Submit 8D report if necessary.

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.