Manufacturing technology of isometric aluminium nickel cobalt titanium permanent magnet alloy

Abstract

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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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