In the past 30 years, the global permanent magnet industry has flourished, magnetic properties have continued to record, and the varieties and brands of materials have been increasing. As the market expands, its manufacturers are also increasing, and many customers inevitably fall into this confusion. How to judge the quality of aluminum nickel cobalt magnets? Comprehensive judgment method: 1. Magnetic performance; 2. Magnetic size; 3. Magnetic coating.
1. The guarantee of aluminum nickel -cobalt magnetic performance comes from the control of the production process of raw materials.
1. In accordance with the requirements of high, medium and low -grade aluminum nickel cobalt magnets, purchase raw materials in accordance with national standards.
2. The advanced production process directly determines the performance and quality of the magnet. At present, advanced technologies include plate blanking (SC), hydrogen crushing (HD), and airflow grinding (JM). Small capacity vacuum sensing furnace (10kg, 25kg, 50kg) has been replaced by large -capacity vacuum induction furnaces (100kg, 200kg, 600kg, 800kg). SC (thin band casting) rapid solidification casting technology has gradually replaced large-scale ingot (cooler thickness of the cooling direction of more than 20-40mm), while hydrogen crushing (HD) technology and air grinding (JM) replaced the jaw crusher, the disc The grinding machine and ball mill (wet ball mill) ensure the uniformity of the powder, which is conducive to liquid -phase sintering and grain fineization.
3. In the direction of the magnetic field, China is a country that is suppressed in two steps. Orientation, through low -voltage vertical forming, is formed by quasi -waiting static pressure. This is one of the important features of China's aluminum nickel cobalt magnetic industry.
4. In addition, the quality control of the production process is very important, which can be controlled through SC tablet thickness measurement and JM powder particle size distribution. High -quality products depend on the control of the production process, but customers will be very confused. How to judge the performance of the products purchased? The Chinese Institute of Metrology Science has developed various permanent magnetic materials magnetic parameters. Pulse magnetic field magnetic strong meter (PFM) is a detection instrument with ultra -high -orthodontics permanent magnets, which are mainly used to meet the needs of electric vehicles and large permanent magnet motors on high -orthodontics and permanent magnets. Customers can choose the required aluminum -nickel -cobalt magnets based on the magnet parameter br (remaining magnet), HCB (orthodox power), HCJ (internal orthodontics) and BH. At the same time, these four parameters are judging whether the product is the standard for production in accordance with the customer's requirements.
Second, the guarantee of the size of aluminum nickel cobalt depends on the processing strength of the factory.
The actual used iron boron permanent magnet has various shapes, such as discs, cylindrical, cylindrical (with inner holes); blocks, squares and cylinders; tiles, fan -shaped, trapezoids, polygons and various irregular shapes. The size of the permanent magnets of each shape is different, and it is difficult to take shape in the production process.
