Abstract
The invention relates to an Er-based amorphous low-temperature magnetic refrigeration material and a preparation method thereof. The Er-based amorphous low-temperature magnetic refrigeration material has a general chemical formula: EraTbAlc, wherein T is one of Fe, Co, Ni or Cu; a ranges from 56 to 63, b ranges from 18 to 33, c ranges from 16 to 28, and a plus b plus c is equal to 100. The method comprises the steps of (1) preparing materials, wherein Er is slightly excessive; (2) carrying out electric arc melting until completely melting under an inert gas condition, naturally cooling after heat preservation, and repetitively melting to obtain an alloy ingot with homogeneous compositions; (3) after cleaning a surface, crushing into small blocks of alloy ingots; and (4) adopting an induction melting melt-spinning device for completely melting the ingots under an inert gas condition, carrying out melt-spinning after heat preservation, and obtaining the Er-based amorphous low-temperature magnetic refrigeration material. The material provided by the invention has the width ranging from 2 to 2.8mm and the thickness ranging from 35 to 42mm; under 0 to 7T magnetic variation, the magnetic transition temperature ranges from 8 to 18K, the maximal magnetic entropy ranges from 12.6 to 22.5J / kgK, and the magnetic refrigerant capacity ranges from 480 to 620J / kg; and the glass transition temperature ranges from 550 to 640K, the crystallization temperature ranges from 640 to 700K, and the cold liquid phase region width ranges from 33 to 65K.
Description
technical field
[0001] The invention belongs to the technical field of materials science and relates to a magnetic functional material, in particular to an Er-based amorphous low-temperature magnetic refrigeration material and a preparation method thereof. Background technique
[0002] Magnetic refrigeration material is a new type of magnetic functional material, which is a non-polluting refrigerant material that uses the magnetic entropy effect of magnetic materials to achieve refrigeration. The magnetic entropy effect is one of the intrinsic properties of magnetic materials, and its size depends on the intrinsic physical properties of magnetic materials. Magnetic refrigeration is the use of an external magnetic field to make the magnetic moment of the magnetic working medium change in an orderly and disorderly manner (phase transition), causing the magnet to absorb heat and release heat to perform a refrigeration cycle.
[0003] Magnetic refrigeration is considered as a "...
