Manufacturing technology of isometric aluminium nickel cobalt titanium permanent magnet alloy
A technology of AlNiCoTi and permanent magnet alloys, which is applied in the manufacturing process of axial crystal AlNiCoTi permanent magnet alloys, can solve the problems of low coercive force, high product difficulty, and small production, and achieve improved purity and magnetic properties. , Improve process stability, slow down the effect of solidification speed
Inactive Publication Date: 2007-11-21
宁波盛事达磁业有限公司
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Problems solved by technology
Alnico permanent magnet alloy products produced by casting process have defects such as poor precision, high difficulty in making small and complicated products, and poor surface quality, while sintered alnico titanium permanent magnet alloy produced by powder metallurgy process Although the product overcomes the product defects produced by the aforementioned casting process and meets the requirements of precision and quality, its magnetic performance is low.
Chinese Patent No. 01130484.7 "Powder Sintered Alnico-Titanium Permanent Magnetic Alloy Production Process" has adjusted key processes such as formula ingredients, sintering, and heat treatment, so that the magnetic properties have been greatly improved, and the same index as the casting process has been achieved. Magnetic performance indicators: magnetic induction (Br) = 840 ~ 1000 (mT); coercive force (Hcb) = 90 ~ 145 (KA / m); magnetic energy level (BH) max = 34 ~ 50 (KJ / m 3 ), but despite this, in terms of internal defects of the alloy, even the fine pinholes and pits on the grinding surface of the permanent magnet alloy produced by the sintering process still exist, and the current process technology is difficult to eliminate these defects. In addition, The coercive force (Hcb) in the magnetic properties is still low, which is limited in some applications of modern technology
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[0023] group
[0024] The metal elements in the formula are in the form of solid blocks. Among them, the formula ratio of ferroniobium NbFe is as stipulated: niobium Nb:iron Fe=1:1, and the addition of metal elements can also be added in the form of alloys in corresponding proportions.
[0025] The process requires that the raw materials must eliminate the oxide skin and its attachments on the surface, and dry them at a temperature of 120°C for 2 hours to remove moisture.
[0026] Furnace charging and mold preparation are carried out before vacuum melting with argon protection.
[0027] The vacuum chamber must be cleaned before charging the charge, and there must be no dust and water vapor. The formula charge should be loaded into the bottom of the furnace hearth in the order of iron, nickel, cobalt, copper, and ferroniobium, and aluminum and iron should be loaded on the upper part of the furnace hearth. , Add elements silicon, iron sulfide, samarium cobalt and put ...
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A process for preparing the permanent-magnet AlNiCo alloy with equiaxed crystals includes such steps as proportionally mixing Al, Ni, Co, Cu, Ti, NbFe (1: 1), Fe, Si, FeS and SmCo, charging the mixture in furnace, preparing casting mould, vacuumizing, electric heating, filling Ar gas, casting, annealing, two-stage preheating, solution treating, magnetic field controlled cooling and three-stage tempering.
Description
technical field [0001] The invention relates to a manufacturing process of a permanent magnetic alloy, in particular to a manufacturing process of an equiaxed crystal AlNiCoTi permanent magnetic alloy. Background technique [0002] Permanent magnetic alloys are widely used in high-tech, such as mobile communications, high-end hearing aids, magnetic sensors and so on. At present, there are two methods for producing alnico-titanium permanent magnet alloy: one is cast alnico-titanium permanent magnet alloy produced by atmospheric melting and pouring; the other is sintered alnico-titanium permanent magnet alloy produced by powder metallurgy process Cobalt titanium permanent magnet alloy. Alnico permanent magnet alloy products produced by casting process have defects such as poor precision, high difficulty in making small and complicated products, and poor surface quality, while sintered alnico titanium permanent magnet alloy produced by powder metallurgy process Although the p...
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IPC IPC(8): C22C1/02C22C30/00C22F1/16
Inventor 凌铨王占国
Owner 宁波盛事达磁业有限公司