Lanthanum-iron-silicon-based hydride magnetic working fluid, preparation method thereof, and magnetic refrigerator
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A technology of magnetic working fluid and hydride, applied in the field of magnetic refrigeration working fluid, can solve the problems of increased risk and unguaranteed mechanical properties.
Active Publication Date: 2019-10-18
BAOTOU RES INST OF RARE EARTHS
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However, during the hydrogen charging process, the hydrogen pressure requirement is relatively high, which is 1-5 atm, which increases the danger during the hydrogen charging process. In addition, the mechanical properties of the block material after hydrogen charging cannot guarantee that it can meet the requirements for application in magnetic refrigerators.
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[0048] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0049] The invention provides a lanthanum-iron-silicon-based hydride magnetic working fluid, whose chemical formula is La 1-a R a (Fe 1-b-c m b Si c ) 13 h d , wherein, R is one or a combination of the following rare earth elements, the rare earth elements are: Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu , Sc, Y; the value range of a is 0-0.5; M is a composition of one or more of Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga; the value range of b is 0.005-0.05, the value range of c is 0.069-0.162; the value range of d is 0-2.
[0050] In this paper, for the magnetic working fluid proposed above, the ingredients of the specific chemical formula are carried out, and the sample preparation experiment of the magnetic workin...
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Abstract
The invention discloses a lanthanum-iron-silicon-based hydride magnetic refrigerant, a preparation method of the lanthanum-iron-silicon-based hydride magnetic refrigerant and a magnetic refrigerator. The chemical formula of the lanthanum-iron-silicon-based hydride magnetic refrigerant is La1-aRa(Fe1-b-cMbSic)13Hd, wherein R represents one or a composition of a plurality types of the following rare earth elements: Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc and Y; a value range of a is 0 to 0.5; M represents one or a composition of a plurality of types of Ti, V, Cr, Mn, Co, Ni, Cu, Zn and Ga; a value range of b is 0.005 to 0.05; a value range of c is 0.069 to 0.162; and a value range of d is 0 to 2. The lanthanum-iron-silicon-based hydride magnetic refrigerant provided by the invention is formed into a block by adopting a hot pressing molding process, introduction of impurity constituents such as an adhesive and the like is avoided, a high thermomagnetic property is kept, the prepared magnetic refrigerant is excellent in mechanical property, the problem of reduction of mechanical properties of pulverization, frangibility and the like of a lanthanum-iron-silicon-based compound after hydrogenation is solved, and performance of the formed magnetic refrigerant can meet the use requirements of the magnetic refrigerator.
Description
technical field [0001] The invention relates to the technical field of magnetic refrigerants, in particular to a lanthanum-iron-silicon-based hydride magnetic refrigerant, a preparation method thereof, and a magnetic refrigerator. Background technique [0002] Refrigeration near room temperature, such as refrigerators and air conditioners, is currently achieved by gas compression. However, fluorine-containing refrigerants have the disadvantages of destroying the ozone layer and emitting greenhouse effect gases. At the same time, gas compression refrigeration has low efficiency and high energy consumption. As an emerging high-efficiency and energy-saving green refrigeration technology, magnetic refrigeration uses solid refrigerant and circulating fluid, and has no pollution to the atmosphere and other environmental resources. Magnetic refrigeration also has the advantages of being stable and reliable. Since there is no need for a gas compressor, there are few moving parts and...
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