摘要:
Provided is a high-strength, bonded La(Fe, Si)13-based magnetocaloric material, as well as a preparation method and use thereof. The magnetocaloric material comprises magnetocaloric alloy particles and an adhesive agent, wherein the particle size of the magnetocaloric alloy particles is less than or equal to 800 μm and are bonded into a massive material by the adhesive agent; the magnetocaloric alloy particle has a NaZn13-type structure and is represented by a chemical formula of La1-xRx(Fe1-p-qCopMnq)13-ySiyAα, wherein R is one or more selected from elements cerium (Ce), praseodymium (Pr) and neodymium (Nd), A is one or more selected from elements C, H and B, x is in the range of 0≦x≦0.5, y is in the range of 0.8≦y≦2, p is in the range of 0≦p≦0.2, q is in the range of 0≦q≦0.2, α is in the range of 0≦α≦3.0. Using a bonding and thermosetting method, and by means of adjusting the forming pressure, thermosetting temperature, and thermosetting atmosphere, etc., a high-strength, bonded La(Fe, Si)13-based magnetocaloric material can be obtained, which overcomes the frangibility, the intrinsic property, of the magnetocaloric material. At the same time, the magnetic entropy change remains substantially the same, as compared with that before the bonding. The magnetic hysteresis loss declines as the forming pressure increases. And the effective refrigerating capacity, after the maximum loss being deducted, remains unchanged or increases.
摘要:
Provided is a high-strength, bonded La(Fe, Si)13-based magnetocaloric material, as well as a preparation method and use thereof. The magnetocaloric material comprises magnetocaloric alloy particles and an adhesive agent, wherein the particle size of the magnetocaloric alloy particles is less than or equal to 800 μm and are bonded into a massive material by the adhesive agent; the magnetocaloric alloy particle has a NaZn13-type structure and is represented by a chemical formula of La1-xRx(Fe1-p-qCopMnq)13-ySiyAα, wherein R is one or more selected from elements cerium (Ce), praseodymium (Pr) and neodymium (Nd), A is one or more selected from elements C, H and B, x is in the range of 0≤x≤0.5, y is in the range of 0.8≤y≤2, p is in the range of 0≤p≤0.2, q is in the range of 0≤q≤0.2, α is in the range of 0≤α≤3.0. Using a bonding and thermosetting method, and by means of adjusting the forming pressure, thermosetting temperature, and thermosetting atmosphere, etc., a high-strength, bonded La(Fe, Si)13-based magnetocaloric material can be obtained, which overcomes the frangibility, the intrinsic property, of the magnetocaloric material. At the same time, the magnetic entropy change remains substantially the same, as compared with that before the bonding. The magnetic hysteresis loss declines as the forming pressure increases. And the effective refrigerating capacity, after the maximum loss being deducted, remains unchanged or increases.
摘要:
The invention provides a La(Fe,Si)13-based magnetic refrigeration material prepared from industrial-pure mischmetal as the raw material, wherein the industrial-pure mischmetal is impurity-containing and naturally proportionated La—Ce—Pr—Nd mischmetal or LaCe alloy which, as the intermediate product during rare earth extraction, is extracted from light rare earth ore. The invention further provides the preparation method and use of the material, wherein the preparation method comprises the steps of smelting and annealing industrial-pure mischmetal as the raw material to prepare the La(Fe,Si)13-based magnetic refrigeration material. The presence of impurities in the industrial-pure mischmetal has no impact on the formation of the 1:13 phase, the presence of the first-order phase-transition property and metamagnetic behavior, and thus maintains the giant magnetocaloric effect of the magnetic refrigeration material. The preparation of La(Fe,Si)13-based magnetic refrigeration material from industrial-pure mischmetal reduces the dependency on high-purity elementary rare earth raw material; lowers the cost for manufacturing the material; and thus plays an important role in development of the magnetic refrigeration application of materials.