Current transformer iron core of amorphous and nano-crystalline magnetically soft alloy and preparation method thereof

Abstract

The invention discloses a current transformer iron core of amorphous and nano-crystalline magnetically soft alloy and a preparation method of the current transformer iron core. The chemical component atomic percent of the iron core is FeaSibBcMdCueM'f, wherein a is not more than 85 and is not less than 65; b is not more than 25 and is not less than 5; c is not more than 15 and is not less than 0; d is not more than 15 and is not less than 0; e is not more than 5 and is not less than 0, and f is not more than 1 and is not less than 0, and a plus b plus c plus d plus e plus f equals to 100, and M is at least one of Nb, Mo or V, and M' is at least one of Sn, Al, Y and Sb. The preparation method comprises the steps as follows: preparing materials according to atomic percent and smelting to prepare a mother alloy; then crushing the prepared mother alloy to re-melt and covering steel-making slagging constituent to prevent oxidation and deslagging; preparing amorphous alloy ribbons with the re-melted mother alloy by using a single roll rapid solidification ribbon preparation method under ordinary pressure, and finally winding the amorphous alloy ribbons as the amorphous iron core, and performing isothermal annealing crystallization in a vacuum annealing furnace to obtain the amorphous and nano-crystalline magnetically soft alloy of a mutual inductor iron core. The iron core of the invention has high saturation flux density, high permeability, and low magnetic loss so that the mutual inductor has ultrahigh precision and accuracy class.

Description

technical field [0001] The invention relates to the technical field of magnetic materials and their preparation, in particular to a current transformer iron core of an amorphous nanocrystalline soft magnetic alloy and a preparation method thereof. Background technique [0002] Current transformer is the key equipment for power production and household electric energy metering and protection. The working principle of a current transformer is similar to that of an ordinary transformer: it converts the high voltage of the grid into a low voltage; converts a large current into a small current. However, an important difference between a current transformer and an ordinary transformer is that it has high measurement accuracy requirements. [0003] As the core component of the current transformer - the iron core, the traditional soft magnetic materials that can be selected include: ferrite, permalloy and silicon steel sheet. Due to its low saturation magnetic induction and poor t...

AI Technical Summary

Problems solved by technology

However, the accuracy level of manufactured transformers is limited to 0.2, and transformers with higher accuracy requirements cannot meet the requirements.

[0008] To sum up, when the existing amorphous and nanocrystalline soft magnetic materials are used as high-precision and high-accuracy transformer cores, they all have too low saturation magnetic induction, poor temperature characteristics, expensive prices, large losses, and low initial magnetic properties. At least one disadvantage such as low conductivity