| 简介 |
A method for manufacturing a magnetocaloric element including the following steps : a powder of a magnetocaloric alloy with composition : La1-x(Ce, Pr)x((Fe1-z-vMnzCov)1-ySiy)wXn is prepared, wherein : X is one or several elements selected from H, C, N and B; x=0 to 0.5; y=0.05 to 0.2; z=0 to 0.15; v=0 to 0.15; w=12 to 16; n=0 to 3.5; the remainder being impurities, with a maximum content of 4% by weight, preferably a maximum content of 2% by weight, of rare earths other than La, Ce and Pr, and a maximum content of 2% by weight, for the other impurities, the preparation of the powder including the following steps : a liquid alloy (4) is elaborated; it is solidified in the form of a powder of substantially spherical particles (14) with an average diameter comprised between 10 and 100 μm by atomization of a jet (8) by means of an inert gas; said powder (14) is heat-treated in order to give it at least 70% by weight of a structure of the NaZn13 type by heating up to a temperature from 900 to 1, 200° C.; optionally, a hydridration and/or nitridation and/or carbidation and/or carbonitridation treatment is carried out for giving n its definitive value; said powder (14) is dispersed in a matrix formed by one or several organic binders for forming a mixture including from 40 to 80% by volume of powder; said mixture is shaped. |
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