Method for assessing content of impure phases in LaFeSi-base magnetic refrigeration material

Abstract

The invention relates to the technical field of base magnetic refrigeration materials, and discloses a method for assessing content of impure phases in a LaFeSi-base magnetic refrigeration material. The method comprises the following steps that XRD detection is carried out on a plurality of LaFeSi-base magnetic refrigeration material samples with the content of the impure phases being 3-12%, the sample with the content of the impure phases being 3%, the sample with the content of the impure phases being 6%, the sample with the content of the impure phases being 9% and the sample with the content of the impure phases being 12% are screened out, a standard permanent magnet detection block with the mass being X1, a standard permanent magnet detection block with the mass being X2, a standard permanent magnet detection block with the mass being X3 and a standard permanent magnet detection block with the mass being X4 are acquired and manufactured, an impure phase content assessment form is formulated, the LaFeSi-base magnetic refrigeration material to be detected is taken and fixed to a lifting rod and makes contact with the standard permanent magnet detection block with the mass being X1, the standard permanent magnet detection block with the mass being X2, the standard permanent magnet detection block with the mass being X3 and the standard permanent magnet detection block with the mass being X4 in sequence, and the content of the impure phases is assessed according to whether the permanent magnet detection blocks are attracted to the LaFeSi-base magnetic refrigeration material or not. The method has the advantage that the content of the impure phases in the LaFeSi-base magnetic refrigeration material can be quickly, efficiently and visually assessed.

Description

technical field [0001] The invention relates to the technical field of detection of base magnetic refrigeration materials, in particular to a method for evaluating the impurity content in LaFeSi base magnetic refrigeration materials. Background technique [0002] At present, the commonly used magnetic refrigeration materials mainly include LaFeSi-based alloys, Gd-based alloys, and MnFePAs-based alloys. Among them, LaFeSi-based magnetic refrigeration materials have become the most promising magnetic refrigeration materials because of their low cost, non-toxicity, and easy preparation. The LaFeSi-based magnetic refrigeration material contains La(Fe,Si) 13 phase and α-Fe phase, where La(Fe,Si) 13 The matrix phase is the matrix phase, the Curie temperature of the matrix phase is low, and it is paramagnetic at room temperature. The magneto-caloric properties of refrigeration materials are mainly obtained by the matrix phase, so in the process of producing LaFeSi-based magnetic ...

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Problems solved by technology

[0004] The present invention provides a low-cost, high-efficiency evaluation method for impurity phase content in LaFeSi-based magnetic refrigeration materials in order to overcome the shortcomings of high cost of impurity detection equipment and long detection period of LaFeSi-based magnetic refrigeration materials in the prior art. It is especially suitable for the impurity evaluation of large quantities of LaFeSi-based magnetic refrigeration materials, so as to determine different heat treatment processes

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