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How to ensure the quality in the production of nd-fe-b materials?

by:Newland     2020-05-03
Sintered ndfeb permanent magnet material is made of powder metallurgy method its technological process is as follows: raw materials processing to ingredients to smelting, powder, magnetic field orientation and pressed and sintered density to temper aging, machining and surface treatment and detection. Can be seen from the process of its entire process is a systematic project, especially high performance ndfeb permanent magnet materials, the production process of every process on the performance of the product has the 'decision' and the 'veto'. Star in order to ensure the quality of sintered ndfeb permanent magnet materials, the production line daily work around the base of 'four precautions' work carried out, namely, anti-oxidation, prevent confusion, prevent impurities and moisture proof. A, anti-oxidation, ndfeb is a kind of rare earth permanent magnet material formula contains larger proportion of rare earth elements. Characteristics of rare earth element is the chemical properties, easy to react with oxygen in the air, produce rare earth oxides such as neodymium react with oxygen to form neodymium oxide. After rare earth oxide, the product of magnetic will drop significantly. So in our ndfeb material production process, how to do a good job of 'anti-oxidation' is an important link of quality. Second, the confusion of sintered ndfeb according to different performance requirements, such as the rest of the magnetic induction intensity, the coercive force and maximum magnetic energy product use different brand to distinguish between said. At present our company with the main N, M, H, SH, UH, EH, AH seven big series. From N to AH coercive force increase gradually. Each series with different Numbers to distinguish between the discretion of magnetic energy product such as N series have N30, N35, N38, N42, N45, N50 and N52 are the greater the number the higher the magnetic energy product. Different grades, formula, process, meaning is different also. We according to the customer's various orders with different brand and technology to production to meet customer needs. In ingredients and melting operation must pay attention to the 'confusion' prevention work, don't put the number to make wrong to ingredients weight is calculated according to match Fang Chan said after promptly put the right sign, smelting operators according to brand accurately record the raw data and melting tracking tickets. Three, prevent impurities of sintered ndfeb permanent magnet materials, it is the best raw materials such as rare earth, iron, boron proportion of organic combination, thus forming Nd2Fe14B main phase and other basic phase after smelting, milling, molding, sintering process, finally get some magnetic, density and specifications of the magnets. Only qualified magnet can ensure that after processing section, the interior and the exterior of the product quality after plating. From a performance point of view, we are going to put an end to the basic composition of harmful elements into the case affect the magnet. Therefore we must prevent the impurity element sandwiched so as not to cause foaming products sintering different melting point and when magnet, shrinkage cavity, or in the acid treatment of electroplating spots, such as peeling affect product quality. So the impurity is our enemy of sintered ndfeb. Market competition greatly the upper now competition in product quality, we want to in the intense market competition must be strict with product quality case takes hold. Four, be affected with damp be affected with damp proof of ndfeb rare earth permanent magnet materials formula contains larger proportion of rare earth elements. The characteristics of rare earth elements is the chemical nature very lively, easy to react with oxygen in the air, generation of rare earth oxides, products of magnetic will drop significantly. When be affected with damp be affected with damp raw materials or equipment, use of jigs and fixtures that contain high moisture in the machining process of high temperature water molecules is decomposed into oxygen and hydrogen and react with rare earth elements such as neodymium. So in our ndfeb material production process, how to do a good job 'be affected with damp be affected with damp proof' is a key link of quality guarantee.
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