A low-expansion magnetic shielding alloy and its preparation method

Abstract

The invention belongs to the field of precision alloy, and particularly relates to a low-expansion magnetic shielding alloy for an optical fiber loop skeleton, and a preparation method thereof. The alloy comprises the following chemical components in percentage by weight: 32.0-35.2% of Ni, 3.0-3.5% of Co, 0.10-0.25% of Mn, less than or equal to 0.15% of Si, less than or equal to 0.02% of Cu, less than or equal to 0.01% of C, less than or equal to 0.01% of P, less than or equal to 0.01% of S, and the balance of Fe. The preparation method of the low-expansion magnetic shielding alloy comprises the following steps sequentially: preparation of high-purity raw materials, proportioning of ingredients, smelting of a vacuum induction furnace and vacuum arc remelting, forging and processing, sampling, thermal treatment, and performance test. The thermal treatment system comprises the steps of under protection of high-purity hydrogen gas, carrying out furnace heating to 970+ / -10DEG C, preserving heat for 2.5-3h, cooling to 550+ / -10DEG C at the speed of 200-250DEG C / h, rapidly cooling to 300DEG C below for discharging. Compared with the existing low-expansion alloy 4J32 and on the premise that low-expansion characteristic is kept, the low-expansion magnetic shielding alloy has high initial magnetic conductivity, integrates the two advantages of low expansion property and high magnetic shielding property, namely within the temperature range of -45DEG C to 75DEG C, the expansion coefficient of the alloy is 1.0*10<-6> / DEG C below; the initial magnetic conductivity is higher than 1.5mH / m.

Description

technical field [0001] The invention belongs to the field of precision alloys, and in particular relates to a low-expansion magnetic shielding alloy for making an optical fiber ring skeleton and a preparation method thereof. Background technique [0002] Compared with traditional mechanical devices, fiber optic devices have the advantages of simple structure, light weight, fast response, and long life. On the one hand, in order to overcome the adverse effects of temperature changes on the accuracy of optical fiber devices, the material of the fiber ring skeleton is required to have a low linear expansion coefficient consistent with that of the optical fiber; on the other hand, in order to reduce the Faraday effect of the magnetic field on light, the optical fiber is required In a low magnetic field environment. In this way, in order to further improve the precision of the optical fiber device, the skeleton material of the optical fiber ring needs to have both low expansion ...

AI Technical Summary

Problems solved by technology

Although the aluminum alloy fiber optic bobbin has the advantages of fast heat conduction and light weight, it cannot match the optical fiber well and does not have the function of magnetic shielding

Images