Magnetic powder production method adopting mixed rare earths to replace partial praseodymium and neodymium
A technology of mixing rare earths and production methods, which is applied in the direction of magnetic materials, magnetic objects, and the magnetism of inorganic materials, and can solve problems such as backlogs and unbalanced application of rare earth elements, and achieve the effects of enhanced fluidity, reduced consumption, and low production costs
Inactive Publication Date: 2017-12-01
四川晟磁科技有限公司
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[0014] The technical solutions provided by each embodiment of the invention are described in detail below.
[0015] The invention provides a method for producing a magnetic powder in which a mixed rare earth substitutes a part of praseodymium and neodymium, and the method comprises the following steps:
[0016] Step 1: Vacuum smelting, the raw materials, including: mixed rare earth, praseodymium neodymium alloy, iron, cobalt, zirconium metal and ferroboron are placed in a vacuum smelting furnace for melting to obtain a uniform alloy. The composition formula of the magnetic powder is (R+ PuNd)x(FeCoZr) 84.5- x B 6.5 (atomic percent), wherein, R is mixed rare earth, x=9-11, R:PuNd=1:2-4; The order that described raw material places is successively: boron iron, iron, cobalt, zirconium metal and praseodymium neodymium and Miscellaneous rare earths;
[0017] Step 2: Vacuum quick quenching. After the quick quenching furnace is evacuated, argon gas is filled to positive pressure,...
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Abstract
The invention provides a method for producing magnetic powder in which mixed rare earth replaces part of praseodymium neodymium, comprising the following steps: vacuum smelting, melting mixed rare earth, praseodymium neodymium alloy, iron, cobalt, zirconium metal and ferroboron in a vacuum melting furnace to obtain Uniform alloy, the molecular formula of the magnetic powder is (R+PuNd)X(FeCoZr)84.5-XB6.5, wherein, R is mixed rare earth, x=9-11, R:PuNd=1:2-4; vacuum fast Quenching, vacuumize the quick quenching furnace, fill it with argon to positive pressure, melt the alloy in the crucible in the quick quenching furnace, flow from the gate into the edge of the molybdenum wheel rotating at high speed, the alloy liquid is in the Solidify and cool under the action of molybdenum wheels to form alloy strips; crystallization treatment, the temperature of the crystallization furnace is 670-710 degrees Celsius, and the crystallization time is 5-15 minutes to obtain magnetic powder. The use of mixed rare earths to replace part of NdPr saves the amount of NdPr, can fully utilize the rare earths, does not cause waste of resources, and has lower production costs. It is a reliable way to prepare new permanent magnet materials with low cost and less rare earths.
Description
technical field [0001] The invention relates to the technical field of magnetic powder, in particular to a method for producing magnetic powder in which a part of praseodymium and neodymium is replaced by mixed rare earth. Background technique [0002] Bonded NdFeB is made by the production process of magnetic powder, rubber mixing, granulation, pressing, curing, finishing, painting, magnetization, and finished product packaging. After the production of magnetic powder is completed, the magnetic powder needs to be specially treated to improve the magnetic properties and oxidation resistance of the magnetic powder. NdFeB smelting process is to prepare praseodymium, neodymium, ferroboron, lanthanum, cerium, zirconium, cobalt, mixed rare earth, iron and other raw materials according to a certain proportion, arrange the raw materials in a reasonable order, and pass through the intermediate frequency coil and raw materials. The iron is used for induction, so that various raw mat...
Claims
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IPC IPC(8): H01F1/055H01F1/08C22C38/10C22C38/14B22F1/00
CPCH01F1/0551B22F1/0003C22C38/005C22C38/10C22C38/14H01F1/0557
Inventor 沈秉彝温强熊友勤
Owner 四川晟磁科技有限公司